CN101472047B

CN101472047B - Imaging system, imaging apparatus, portable terminal apparatus, onboard apparatus, medical apparatus and method of manufacturing the imaging system

Info

Publication number: CN101472047B
Application number: CN2008101798278A
Authority: CN
Inventors: 谷山实; 米山一也
Original assignee: Fujinon Corp
Current assignee: Fujifilm Corp
Priority date: 2007-12-07
Filing date: 2008-12-05
Publication date: 2012-05-16
Anticipated expiration: 2028-12-05
Also published as: JP5101468B2; JP2009159603A; CN101472047A

Abstract

An imaging system is provided and includes an imaging lens and an imaging device such that the maximum diameter of an effective region of a point image covers three or more pixels of light receiving pixels, the point image (P1) being projected onto a light receiving surface (21) through the imaging lens (10) from an intended position. A signal processing unit (40) executes restoration processing on first image data output from the imaging device (20), and the restoration processing is executed to generate second image data equivalent to the first image data output from the imaging device (20) when the resolving power of the imaging lens is higher. The imaging lens (10) has a first lens group having a positive power, and a second lens group having a positive power, in order from the object side.

Description

Camera system and manufacturing approach thereof and camera head with this camera system

Technical field

The present invention relates to utilize and restore camera system, the manufacturing approach of camera system and camera head, portable terminal device, mobile unit and the Medical Devices that the quality of the view data that the optical image of body obtains is taken the photograph in raising shooting such as processings with this camera system.

Background technology

As everyone knows, utilize and to have imaging apparatus that two-dimentional shape disposes CCD element or the cmos element etc. of the sensitive surface that a plurality of light receiving pixels constitute and take through imaging lens system and be imaged on the camera system that quilt on the sensitive surface is taken the photograph the optical image of body.

In addition, as an example of this camera system, known vehicle mounted camera that camera system with imaging lens system that the depth of field of being designed to deepens directly is installed on circuit substrate or mobile phone (also claiming mobile phone) are with camera (with reference to patent documentation 1).This size that is directly installed on the camera system on the circuit substrate is limited, so plant bulk is designed to less.

And known loading increases the light receiving pixel quantity of imaging apparatus and improves that high-performance that the camera system of the resolution of imaging lens system forms is vehicle-mounted uses camera with camera or mobile phone.Be equipped on this high-performance that obtains the high image of resolution vehicle-mounted with camera or the camera system of mobile phone with camera in, the resolution of known imaging lens system has the camera system near the performance of diffraction limit.

Patent documentation 1: the open 2007-147951 communique of Japan Patent

But, the image request that utilizes this camera system to obtain is further improved resolution.

Improve the resolution of the image that obtains by camera system, improve the resolution of imaging lens system when need increasing the quantity of light receiving pixel.Promptly; When for example improving the picture element density of the light receiving pixel on the sensitive surface that is arranged in imaging apparatus; The resolution that improves imaging lens system makes the point that projects on this sensitive surface through imaging lens system look like to converge in the scope of 1 light receiving pixel, thereby can improve the resolution of utilizing the image that camera system obtains.

Here, along with the raising of technology in recent years, can realize aggrandizement apparatus size not with comparalive ease and improve the picture element density of the light receiving pixel that constitutes imaging apparatus.

On the other hand, the resolution of raising imaging lens system is very difficult.That is, for the size that do not increase imaging lens system or the depth of field is shoaled and improve the resolution of this imaging lens system, need to suppress to constitute the form error or the assembly error of each lens of imaging lens system.But the resolution of this imaging lens system has been brought up near diffraction limit sometimes, exists further raising to make precision (processing, assembling, degree of regulation etc.) and improves the very problem of difficulty of resolution.

Have again, have in the camera system of this imaging lens system that forms the high image of resolution, owing to the difficulty of making is difficult to improve qualification rate in manufacturing.That is, owing to can not generate the view data that can form image, therefore might produce much from manufacturing line and pull down and turn back to and regulate again or the camera system of assembling again with predetermined resolution.And, with regard to the camera system of pulling down from manufacturing line,, can form the view data of the image of predetermined resolution with generation thereby obtain regenerating through confirming its reason and imposing correction.

But; The reason that reduces from the resolution of the image of the pictorial data representation of camera system output has a lot, and the assembling, regulating error (the airspace errors between the offset error of lens, heeling error, the lens), imaging apparatus of for example considering form error (surface shape error of lens, thickness error, eccentric error), the imaging lens system of each lens of formation imaging lens system is to a variety of causes of the position error of imaging lens system etc.Therefore, have following problem, that is, for the reduction reason through confirming resolution and regulate or assembling again, regeneration is with the camera system of the high-quality view data that can generate the image that can form predetermined resolution again, and huge expense produces.

Summary of the invention

The present invention makes in view of the above problems; Its purpose is, provides can improve to take to project to the optical image that receives face and camera system, the manufacturing approach of camera system and camera head, portable terminal device, mobile unit and the Medical Devices with this camera system of the quality of the view data that obtains.

The camera system of the 1st mode of the present invention is characterized in that, has: imaging lens system; Imaging apparatus has that two-dimentional shape is arranged a plurality of light receiving pixels and the sensitive surface that constitutes, takes to project to quilt on the sensitive surface through imaging lens system and take the photograph the optical image of body and export the 1st view data that this quilt of expression is taken the photograph body; And signal processing unit, above-mentioned the 1st view data is implemented to generate and when the resolution of imaging lens system is high, handled from the recovery of the 2nd equal view data of the 1st view data of imaging apparatus output; Imaging lens system possesses the 1st set of lenses that comprises 1 lens at least and have positive focal power successively, and comprises 1 lens at least and have the 2nd set of lenses of positive focal power from the thing side; Imaging lens system and imaging apparatus constitute: the optional position for from X, Y, Z direction projects to the some picture on the sensitive surface through this imaging lens system; Also make the maximum gauge of effective coverage of this some picture become the above size of 3 pixels that relates to light receiving pixel; And above-mentioned signal processing unit use is carried out above-mentioned recovery with the corresponding recovery coefficient of state of the some picture of the 1st pictorial data representation and is handled.

Above-mentioned imaging lens system can constitute: for from projecting to the optical image that quilt on the sensitive surface is taken the photograph body at a distance of the optional position of the X more than 10 times of the focal length of this imaging lens system, Y, Z direction through this imaging lens system, make that also the value of the MTF characteristic relevant with this optical image just becomes.

Above-mentioned signal processing unit can be with restoring processing by reaching the pixel region that adds up to more than 9 pixels that relates to that constitutes more than horizontal 3 pixels more than vertical 3 pixels on the sensitive surface as least unit; The recovery processing is carried out as least unit in the minimum pixel zone that maybe will comprise whole effective coverages of the some picture that projects on the sensitive surface.

Above-mentioned signal processing unit can be carried out to restore and handle, and the size of the effective coverage of the above-mentioned some picture in the image shown in feasible expression the 2nd view data is less than the size of the effective coverage of the some picture in the image shown in expression the 1st view data.

Above-mentioned recovery coefficient can be obtained separately this camera system by each camera system; Or the state according to the some picture of the 1st pictorial data representation is selected from the candidate of each recovery coefficient corresponding with each state of the some picture that is divided into a plurality of kinds; Or from the candidate of the multiple recovery coefficient corresponding, further carried out the recovery coefficient of proofreading and correct according to the state of a picture according to the selected recovery coefficient that goes out of the state of the some picture of the 1st pictorial data representation with each state of this some picture that is divided into a plurality of kinds.

Above-mentioned camera system also possesses the recovery coefficient of obtaining recovery coefficient and obtains the unit.

The camera system of the 2nd mode of the present invention is characterised in that to possess: imaging lens system; Imaging apparatus has that two-dimentional shape is arranged a plurality of light receiving pixels and the sensitive surface that constitutes, takes to project to quilt on the above-mentioned sensitive surface through imaging lens system and take the photograph the optical image of body and export the 1st view data that this quilt of expression is taken the photograph body; The coefficient storage unit; When the maximum gauge in the effective coverage that projects to the some picture on the sensitive surface through imaging lens system relates to big or small more than 3 pixels on this sensitive surface, to store by the corresponding recovery coefficient of state from the some picture of the 1st pictorial data representation of imaging apparatus output; And signal processing unit, utilize the recovery coefficient be stored in the coefficient storage unit to implementing from the 1st view data of imaging apparatus output to generate and when the resolution of imaging lens system is high, handling from the recovery of the 2nd equal view data of the 1st view data of imaging apparatus output; Signal processing unit will restore processing as least unit by reaching the pixel region that adds up to more than 9 pixels that relates to that constitutes more than horizontal 3 pixels more than vertical 3 pixels on the sensitive surface; Imaging lens system has from the thing side successively: comprise 1 lens at least and have positive focal power the 1st set of lenses, and comprise 1 lens at least and have the 2nd set of lenses of positive focal power.

The recovery coefficient that this camera system is obtained separately can be stored by each camera system in above-mentioned coefficient storage unit.

And the selected recovery coefficient of state according to the some picture of the 1st pictorial data representation also can be stored from the candidate of each recovery coefficient corresponding with each state of the some picture that is divided into a plurality of kinds in above-mentioned coefficient storage unit.

In addition, the selected recovery coefficient of state that also can store from the candidate of the multiple recovery coefficient corresponding with each state of this some picture that is divided into a plurality of kinds according to this some picture of the 1st pictorial data representation of above-mentioned coefficient storage unit has further carried out the recovery coefficient of proofreading and correct of having proofreaied and correct according to the state of a picture.

Above-mentioned camera system can also possess the recovery coefficient of obtaining recovery coefficient and being stored in the coefficient storage unit and obtain the unit.

Above-mentioned signal processing unit also can be carried out the minimum pixel zone of the whole effective coverages that comprise the some picture that projects on the sensitive surface to restore as least unit and handle.

Above-mentioned signal processing unit is preferably carried out and restore to be handled, and makes the size of effective coverage of the some picture in the image of the 2nd pictorial data representation less than the size of the effective coverage of the some picture in the image of the 1st pictorial data representation.

In the camera system of above-mentioned the 1st mode and the 2nd mode, above-mentioned imaging lens system can be made up of 2 einzel lenses.

Can the pairing einzel lens of above-mentioned the 1st set of lenses be made as the meniscus shape of convex surface towards the thing side, can the pairing einzel lens of above-mentioned the 2nd set of lenses be made as the meniscus shape of convex surface towards the thing side.

Can the pairing einzel lens of above-mentioned the 1st set of lenses be made as this signal-lens two sides and be convex form, can the pairing einzel lens of above-mentioned the 2nd set of lenses be made as the meniscus shape of convex surface towards the picture side.

Camera head of the present invention is characterised in that to possess the camera system of above-mentioned the 1st mode or the 2nd mode.

Portable terminal device of the present invention is characterised in that to possess the camera system of above-mentioned the 1st mode or the 2nd mode.

Mobile unit of the present invention is characterised in that to possess the camera system of above-mentioned the 1st mode or the 2nd mode.

Medical equipment characteristic of the present invention is to possess the camera system of above-mentioned the 1st mode or the 2nd mode.

The camera system of the 3rd mode of the present invention is characterised in that to possess: imaging lens system; Imaging apparatus has that two-dimentional shape is arranged a plurality of light receiving pixels and the sensitive surface that constitutes, takes to project to quilt on the sensitive surface through imaging lens system and take the photograph the optical image of body and export the 1st view data that this quilt of expression is taken the photograph body; The coefficient storage unit; When the maximum gauge in the effective coverage that projects to the some picture on the sensitive surface through imaging lens system relates to big or small more than 3 pixels, stored with by the corresponding recovery coefficient of state from the some picture of the 1st pictorial data representation of imaging apparatus output; And signal processing unit, utilize recovery coefficient that the 1st view data implement is generated and when the resolution of imaging lens system is high, handle from the recovery of the 2nd equal view data of the 1st view data of imaging apparatus output; Signal processing unit will restore processing as least unit by reaching the pixel region that adds up to more than 9 pixels that relates to that constitutes more than horizontal 3 pixels more than vertical 3 pixels on the sensitive surface; Imaging lens system has from the thing side successively: comprise 1 lens at least and have the 1st set of lenses of positive focal power and comprise 1 lens at least and have the 2nd set of lenses of positive focal power.

The manufacturing approach of camera system of the present invention is characterised in that; In the manufacturing of the camera system of above-mentioned the 3rd mode; To put on the sensitive surface as the projection imaging apparatus through imaging lens system; Will be stored in the coefficient storage unit by the corresponding recovery coefficient of state from the some picture of the 1st pictorial data representation of this imaging apparatus output, make the camera system of storing recovery coefficient.

Above-mentioned recovery coefficient can be the recovery coefficient of this camera system being obtained separately by each camera system.

Above-mentioned recovery coefficient can be according to the selected recovery coefficient of state of the some picture of the 1st pictorial data representation from the candidate of each recovery coefficient corresponding with the state of the some picture that is divided into a plurality of kinds.

And above-mentioned recovery coefficient can be that the selected recovery coefficient of state according to this some picture of the 1st pictorial data representation has further carried out the recovery coefficient of proofreading and correct according to the state of a picture from the candidate of the multiple recovery coefficient corresponding with each state of this some picture that is divided into a plurality of kinds.

In addition, above-mentioned recovery coefficient is obtained separately this camera system by each camera system.

In the modes of the invention described above; The maximum gauge that projects to the effective coverage of the some picture on the above-mentioned sensitive surface can be the diameter that the effective coverage that projects to the some picture on the sensitive surface comprises this effective coverage on the direction of maximum light receiving pixels; Above-mentioned " maximum gauge of the effective coverage of some picture becomes the structure that relates to the above size of 3 pixels " can be " comprise in the effective coverage of a picture on the direction of maximum light receiving pixels, this effective coverage becomes the structure of the above size of 3 pixels that relates to light receiving pixel ".

Above-mentioned " effective coverage of some picture " means the 1/e of the peak strength in the light distribution with expression point picture ²The zone of the light intensity that (about 13.5%) is above.

In addition, above-mentioned " restore and handle " can be adopted the image restoration processing of the open 2000-123168 number newspaper of (Japan) patent, 0002～0016 section introduction etc.And, in the enforcement that recovery is handled, a non-patent literature of stating after can using! the Jiu swamp praises one, a good fortune man of virtue and ability is outstanding down on the mountain; Exercise question " Kernel Wiener Filter ", 2003 Workshop on Information-Based Induction Sciences, (IBIS2003); Kyoto; Japan, Nov 11-12,2003] technology etc.

In addition; Above-mentioned " at a distance of the position more than 10 times of the focal length of imaging lens system " expression " will constitute in the lens face of imaging lens system near the position of the optical axis intersection of the face of object side (thing side) and this imaging lens system as the reference position, the optical axis direction from this reference position along this imaging lens system (Z-direction) leaves the position more than 10 times of focal length to object side ".

The camera system of the 1st mode of the present invention is made imaging lens system to have successively from the thing side and is comprised 1 lens at least and have the 1st set of lenses of positive focal power and comprise 1 lens at least and have the 2nd set of lenses of positive focal power; Imaging lens system and imaging apparatus are constituted: for projecting to the some picture on the sensitive surface from the optional position through imaging lens system; Also make the maximum gauge of effective coverage of this some picture become the above size of 3 pixels that relates to light receiving pixel; To implementing from the 1st view data of imaging apparatus output to generate and when the resolution of this imaging lens system is high, handle from the recovery of the 2nd equal view data of the 1st view data of imaging apparatus output, the quality of the view data that obtains so can easily improve to projecting to that optical image on the sensitive surface is taken.

That is, in the camera system of the 1st mode of the present invention, the equal image of image that the optical image that utilizes the low imaging lens system of resolution can obtain and take the imaging lens system projection through having the resolution that is higher than this imaging lens system obtains.For example, can make the effective coverage of the some picture through the imaging lens system projection relate to vertical 3 pixels and total 9 pixels of horizontal 3 pixels on the sensitive surface.And; Relate to the some picture that adds up to 9 pixels and implement to restore processing for taking this from the 1st view data of imaging apparatus output; Make when converging in the zone of 1 pixel on the sensitive surface in the effective coverage of for example putting picture; Generate with (promptly from the 1st view data of imaging apparatus output; When the resolution of imaging lens system is high from the 1st view data of imaging apparatus output) the 2nd equal view data, therefore, can access to represent the 2nd view data of identical image than the high resolution of resolution of the image of the 1st pictorial data representation.

And, in this camera system, also can implement above-mentioned recovery processing, so can improve the resolution of the integral image of the 1st pictorial data representation to the optical image that projects on the sensitive surface through imaging lens system from the optional position.That is, the resolution of the arbitrary region in the image of the 2nd pictorial data representation also can be higher than the resolution of the image of the 1st pictorial data representation.

Thus, compare, can improve the quality of view data more easily with the situation of the resolution that improves imaging lens system like the making precision (processing, assembling, degree of regulation etc.) of such raising camera system in the past etc.

In addition; Imaging lens system is constituted; If for projecting to the optical image that quilt on the sensitive surface is taken the photograph body from the optional position of the X more than 10 times of the focal length that leaves this imaging lens system, Y, Z direction through this imaging lens system; Also make the value of the MTF characteristic relevant with this optical image just become, the 1st view data that the quilt of the position more than 10 times that then leaves the focal length of imaging lens system for expression is taken the photograph body also can further improve its quality reliably.

In addition, if signal processing unit will carry out above-mentioned recovery processing as least unit by reaching the pixel region that adds up to more than 9 pixels that relates to that constitutes more than horizontal 3 pixels more than vertical 3 pixels on the sensitive surface, then can implement more reliably to restore and handle.

And, if will comprising the minimum pixel zone of whole effective coverages of the some picture that projects on the sensitive surface, carry out to restore handles signal processing unit as least unit, then can suppress to restore the increase of the operand of processing, and can implement efficiently to restore and handle.

In addition; If signal processing unit is carried out to restore and is handled; The size of the effective coverage of the above-mentioned some picture in the image shown in feasible expression the 2nd view data then can improve the quality of view data more reliably less than the size of the effective coverage of the some picture in the image shown in expression the 1st view data.

Here; If the corresponding recovery coefficient of state (the following fringe that also is called a picture) of the some picture in the image of signal processing unit utilization and the 1st pictorial data representation is implemented the recovery processing; Then can access through the fringe of above-mentioned some picture is accurately proofreaied and correct the 2nd view data that forms, so can improve the quality of view data more reliably.

And; Also " state of some picture " is called " fringe of putting picture "; Its reason is; Project to some picture on the sensitive surface, and take the some picture of the 1st pictorial data representation that this point picture obtains through imaging lens system, because of the influence of lens aberration etc., and its quality and object point corresponding to this point picture to be quilt taken the photograph body compares some deterioration.Promptly; When for example being taken the photograph body and be the resolution chart; Project to picture, and the resolution of image of taking the resolution chart of the 1st pictorial data representation that the picture of this resolution chart obtains of the resolution chart on the sensitive surface through imaging lens system, be lower than resolution as the resolution chart of being taken the photograph body.And, should " state of some picture " or " fringe of some picture " main deterioration state of representing the resolution of some picture.

In addition, if recovery coefficient is obtained separately this camera system by each camera system, then can obtain the recovery coefficient of the quality that can improve view data more accurately.

In addition; If recovery coefficient is from the candidate of each recovery coefficient corresponding with each fringe of the some picture that is divided into a plurality of kinds, to go out according to the fringe of the some picture of the 1st pictorial data representation is selected; Then compare, can obtain recovery coefficient more easily with the situation of each camera system being obtained recovery coefficient separately.

And; If recovery coefficient is the recovery coefficient that from the candidate of the multiple recovery coefficient corresponding with each fringe of this point picture that is divided into a plurality of kinds, has further carried out correction according to the fringe of a picture according to the selected recovery coefficient that goes out of the fringe of the some picture of the 1st pictorial data representation; Then compare, obtain this recovery coefficient in the time of precise decreasing in the time of can suppressing to obtain recovery coefficient more easily with the situation of each camera system being obtained recovery coefficient separately.

In addition, if camera system has the recovery coefficient of obtaining recovery coefficient and obtains the unit, then can obtain recovery coefficient more reliably.

The camera system of the 2nd mode of the present invention possesses: the coefficient storage unit; Maximum gauge in the effective coverage that projects to the some picture on the sensitive surface through imaging lens system is when relating to big or small more than 3 pixels, to store by the corresponding recovery coefficient of state (being also referred to as the fringe of a picture later on) from the some picture of the 1st pictorial data representation of imaging apparatus output; And signal processing unit; Utilize above-mentioned recovery coefficient that the 1st view data implement is generated and when the resolution of imaging lens system is high, handle from the recovery of the 2nd equal view data of the 1st view data of imaging apparatus output; Signal processing unit will restore processing as least unit by reaching the pixel region that adds up to more than 9 pixels that relates to that constitutes more than horizontal 3 pixels more than vertical 3 pixels on the sensitive surface; Imaging lens system has from the thing side successively: comprise 1 lens at least and have positive focal power the 1st set of lenses, and comprise 1 lens at least and have the 2nd set of lenses of positive focal power; So,, then can implement to utilize the recovery of this recovery coefficient to handle if store recovery coefficient in the coefficient storage unit; Thus, can improve the quality of taking the view data that projects to the optical image of sensitive surface and obtain easily.

Promptly; Do not need as before when the resolution from the image of the 1st pictorial data representation of camera system output reaches predetermined level, not confirm its reason and to regulate or assemble again imaging lens system etc. again; Merely in the coefficient storage unit, store the corresponding recovery coefficient of fringe with the some picture of taking by camera system; Only the 1st view data is implemented to restore processing (image processing); Can obtain representing having the 2nd view data of the image of predetermined resolution, so to projecting to that optical image on the sensitive surface is taken and the quality of the view data that obtains just can be improved easily.

And, also " state of some picture " is called " fringe of putting picture ".

And; If the recovery coefficient that the coefficient storage unit is obtained separately this camera system by each camera system storage; Then can obtain recovery coefficient more accurately; And can carry out more accurately to restore and handle, so can improve the quality of taking the view data that projects to the optical image of sensitive surface and obtain more exactly.

And; If coefficient storage unit storage from the candidate of each recovery coefficient corresponding with each fringe of the some picture that is divided into a plurality of kinds according to the selected recovery coefficient of fringe of the some picture of the 1st pictorial data representation; Then compare, can determine recovery coefficient with being more prone to the situation of each camera system being obtained recovery coefficient separately.

Here; If coefficient storage unit storage has further been carried out correction according to the selected recovery coefficient of state of this some picture of above-mentioned the 1st pictorial data representation according to the state of a picture from the candidate of the multiple recovery coefficient corresponding with each fringe of this point picture that is divided into a plurality of kinds the recovery coefficient of having proofreaied and correct; Then compare with the situation of each camera system being obtained recovery coefficient separately; In the time of precise decreasing when suppressing to obtain recovery coefficient, can obtain this recovery coefficient more easily.

In addition, if camera system possesses the recovery coefficient of obtaining recovery coefficient and being stored in the coefficient storage unit and obtains the unit, then can obtain recovery coefficient more reliably.

And; If will comprising the minimum pixel zone of whole effective coverages of the some picture that projects on the sensitive surface, signal processing unit implements to restore processing as least unit; Then can suppress to be used to carry out the increase of restoring the operand of handling, can implement efficiently to restore and handle.

And; If signal processing unit is carried out to restore and is handled; Make the size of effective coverage of the some picture in the image of the 2nd pictorial data representation less than the size of the effective coverage of the some picture in the image of the 1st pictorial data representation, then can improve the quality of taking the view data that projects to the optical image of sensitive surface and obtain more reliably.

In addition; As if only being made as, imaging lens system constitutes by 2 einzel lenses; The einzel lens of the 1st set of lenses is made as the meniscus shape of convex surface towards the thing side; The einzel lens of the 2nd set of lenses is made as the meniscus shape of convex surface towards the thing side, then can improves the quality that the 1st view data of body is taken the photograph in expression more reliably.

And, if being made as this signal-lens two sides, the einzel lens of the 1st set of lenses is convex form, the einzel lens of the 2nd set of lenses is made as the meniscus shape of convex surface towards the picture side, then can improve the telecentric iris property of imaging lens system more reliably.

Camera head of the present invention, portable terminal device, mobile unit, Medical Devices possess the above-mentioned the 1st or the camera system of the 2nd mode respectively, so as above-mentionedly can improve the quality of taking the view data that projects to the optical image of sensitive surface and obtain easily.

The camera system of the 3rd mode of the present invention has: the coefficient storage unit; The maximum gauge that projects to the effective coverage of the some picture on the sensitive surface through imaging lens system is when relating to big or small more than 3 pixels, stored with by the corresponding recovery coefficient of state from the some picture of the 1st pictorial data representation of imaging apparatus output; And signal processing unit; Utilize above-mentioned recovery coefficient; The 1st view data implement is generated and when the resolution of imaging lens system is high, handles from the recovery of the 2nd equal view data of the 1st view data of above-mentioned imaging apparatus output; Signal processing unit will restore processing as least unit by reaching the pixel region that adds up to more than 9 pixels that relates to that constitutes more than horizontal 3 pixels more than vertical 3 pixels on the sensitive surface; Imaging lens system has from the thing side successively: comprise 1 lens at least and have positive focal power the 1st set of lenses, and comprise 1 lens at least and have the 2nd set of lenses of positive focal power; So,, can improve the quality of taking the view data that projects to the optical image of sensitive surface and obtain easily through implementing to utilize the recovery of recovery coefficient to handle as the camera system of above-mentioned the 2nd mode.

The manufacturing approach of imaging lens system of the present invention; In the manufacturing of the camera system of above-mentioned the 3rd mode; To put picture through imaging lens system projects on the sensitive surface of imaging apparatus; Will be stored in the coefficient storage unit by the corresponding recovery coefficient of state from the some picture of the 1st pictorial data representation of imaging apparatus output, so can make the 2nd camera system efficiently.

For example, even do not reaching because of the situation on making etc. from the image resolution ratio of the pictorial data representation of camera system output under the situation of predetermined level, also can improve the Regeneration Treatment of the camera system of image resolution ratio than easy enforcement of past.Promptly; Through recovery coefficient being stored in the camera system of coefficient storage unit; Can easily implement to improve from the recovery of the quality of the view data of this camera system output and handle; So the camera system that can the resolution of image not reached predeterminated level is regenerated as the camera system of the image resolution ratio that can obtain predeterminated level easily, can make camera system efficiently thus.

In addition, if a large amount of production camera system then can be enjoyed the bigger effect of making above-mentioned camera system efficiently.

Description of drawings

Fig. 1 is the block diagram of the brief configuration of expression camera system of the present invention.

Fig. 2 (a) is the figure of the light distribution of expression point picture, and Fig. 2 (b) is the figure that expression projects to the some picture of sensitive surface.

Fig. 3 (a) is the figure at the image of the some picture shown in the image of the 1st pictorial data representation, and Fig. 3 (b) is the figure at the image of the some picture shown in the image of the 2nd pictorial data representation.

Fig. 4 (a) is the figure that projects to the light distribution of the some picture on the sensitive surface at the resolution Gao Shihui of imaging lens system, and Fig. 4 (b) is the figure that projects to the some picture of sensitive surface at the resolution Gao Shihui of imaging lens system.

Fig. 5 is illustrated in the figure of variation of maximum gauge that the optical image that when optical axis direction moves object point, projects to this object point on the sensitive surface is put the effective coverage of picture.

Fig. 6 is the figure of variation that is illustrated in the value (%) of the relevant MTF characteristic of the optical image that when optical axis direction moves object point, projects to this object point on the sensitive surface.

Fig. 7 is the figure of the recovery coefficient acquisition device of expression the 2nd example.

Fig. 8 is the figure of the recovery coefficient acquisition device of expression the 3rd example.

Fig. 9 is illustrated in the figure that inside possesses the camera system of recovery coefficient acquisition device.

Figure 10 is the figure that the inside that is illustrated in signal processing part possesses the camera system of recovery coefficient acquisition device.

Figure 11 is the block diagram of manufacturing approach of brief configuration and the camera system of expression camera system of the present invention.

Figure 12 is the figure of the recovery coefficient acquisition device of expression the 2nd example.

Figure 13 is the figure of the recovery coefficient acquisition device of expression the 3rd example.

Figure 14 is the figure that expression possesses the camera system of recovery coefficient acquisition device.

Figure 15 is illustrated in the figure that signal processing part possesses the camera system of recovery coefficient acquisition device and coefficient storage portion.

Figure 16 is the sectional view that expression is configured in the brief configuration of the imaging lens system in the camera system of embodiment 1.

Figure 17 is the figure of variation of the value of the MTF characteristic of expression when sensitive surface is defocused; Figure 17 (a) is the figure of variation of value of MTF characteristic of the spatial frequency of 20/mm of expression; Figure 17 (b) is the figure of variation of value of MTF characteristic of the spatial frequency of 30/mm of expression; Figure 17 (c) is the figure of variation of value of MTF characteristic of the spatial frequency of 40/mm of expression, and Figure 17 (d) is the figure of variation of value of MTF characteristic of the spatial frequency of 50/mm of expression.

Figure 18 is the figure of aberration of the imaging lens system of the relevant embodiment 1 of expression.

Figure 19 is the sectional view that expression is configured in the brief configuration of the imaging lens system in the camera system of comparative example.

Figure 20 is the figure of variation of the value of the MTF characteristic of expression when sensitive surface is defocused; Figure 20 (a) is the figure of variation of value of MTF characteristic of the spatial frequency of 20/mm of expression; Figure 20 (b) is the figure of variation of value of MTF characteristic of the spatial frequency of 30/mm of expression; Figure 20 (c) is the figure of variation of value of MTF characteristic of the spatial frequency of 40/mm of expression, and Figure 20 (d) is the figure of variation of value of MTF characteristic of the spatial frequency of 50/mm of expression.

Figure 21 is the figure that the automobile of the mobile unit that possesses camera system has been carried in expression.

Figure 22 is that the portable terminal device that expression possesses camera system is the figure of mobile phone.

Figure 23 is that the Medical Devices that expression possesses camera system are the figure of endoscope apparatus.

Among the figure: 10-imaging lens system, 20-imaging apparatus, 21-sensitive surface, 30-coefficient storage portion, 40-signal processing part; The recovery coefficient acquisition device of 70A-the 1st example, the recovery coefficient acquisition device of 70B-the 2nd example, the recovery coefficient acquisition device of 70C-the 3rd example, the 72-ideal point is as storage part; The 74-point is obtained portion as diameter, the 76-judging part, and the 78-recovery coefficient is obtained portion, 79-candidate coefficient storage portion; 100,200-camera system, G1-the 1st view data, G2-the 2nd view data, F-restores processing; P1-point picture, K-recovery coefficient, the status data of Dr-design data, ideal point picture, Dk-coefficient data.

Embodiment

Below, utilize accompanying drawing that execution mode of the present invention is described.

(the 1st execution mode)

Fig. 1 is the block diagram of brief configuration of the camera system of expression the 1st execution mode of the present invention.

[about the structure of camera system]

Below the structure of the camera system of the 1st execution mode is described.

Camera system of the present invention 100 shown in Figure 1 is to have: imaging lens system 10; Imaging apparatus 20 has that two-dimentional shape is arranged a plurality of light receiving pixels and the sensitive surface 21 that constitutes, and takes the photograph the optical image P1 of body and take project to quilt on the sensitive surface 21 through imaging lens system 10, and this quilt of output expression is taken the photograph the 1st view data G1 of body; And signal processing part 40, the 1st view data G1 is implemented in the resolution of imaging lens system 10 generates and handle when high from the recovery of the 2nd equal view data G2 of the 1st view data G1 of imaging apparatus 20 outputs.

Imaging lens system 10 has from object side (thing side) successively: at least by 1 lens the 1st set of lenses that constitute, that have positive focal power; And the 2nd set of lenses that constitutes by 1 lens at least with positive focal power.

Imaging lens system 10 constitutes with imaging lens system element 20; Position arbitrarily about from X, Y, Z direction projects to the some picture (P1) on the sensitive surface 21 through imaging lens system 10, also makes this point become the above size of 3 pixels that relates to light receiving pixel as the maximum gauge of the effective coverage of (P1).

Here, the maximum gauge that projects to the effective coverage of the some picture on the sensitive surface 21 is to project to point on the sensitive surface 21 to comprise this diameter as the effective coverage of P1 on the direction of maximum light receiving pixels as the effective coverage of P1.

And the direction of in Fig. 1, representing with arrow Z is the optical axis direction of imaging lens system 10, and the direction of representing with arrow X, Y is the direction parallel with sensitive surface 21.

Be provided with recovery coefficient acquisition device 70A in the outside of camera system 100, this recovery coefficient acquisition device 70A obtain with the point of representing by the 1st view data G1 from imaging apparatus 20 output as the corresponding recovery coefficient K of the fringe of P1.The recovery coefficient K that above-mentioned signal processing part 40 utilizes recovery coefficient acquisition device 70A to obtain implements to restore processing F.

Here, camera system 100 can have the coefficient storage portion 30 of the recovery coefficient K that storage recovery coefficient acquisition device 70A obtains, but this coefficient storage portion 30 can be built in the signal processing part 40.And, in camera system 100 coefficient storage portion 30 might not be set.

Above-mentioned recovery coefficient acquisition device 70A has: ideal point is as storage part 72, store in advance when in the optical system that comprises imaging lens system 10, not having error fully the design data relevant with a picture or with the ideal point that is superior to it as the relevant ideal point of state as any the data Dr in the status data; The diffusion of the point image state is obtained portion 73, be used to obtain the point represented by the 1st view data G1 from imaging apparatus 20 outputs as the litura of the fringe of P1 as status data Db; And recovery coefficient is obtained the 78A of portion; Input is obtained the above-mentioned fringe as P1 of expression that portion 73 obtains by this diffusion of the point image state litura is as status data Db and to be stored in ideal point be data Dr as design data in the storage part 72 or ideal point as status data; And obtain point that expression representes with above-mentioned the 1st view data G1 coefficient data Dk as the corresponding recovery coefficient K of the fringe of P1 through the computing that utilizes both, and the recovery coefficient K that this coefficient data Dk is represented is stored in the coefficient storage portion 30.

In addition; The imaging lens system that is used for camera system of the present invention is not limited to and must optical image " accurately " be imaged on the imaging lens system on the sensitive surface through this imaging lens system; Even the imaging lens system that optical image " inaccurate " is imaged on the sensitive surface also can be adopted through imaging lens system, therefore adopt in the present invention through imaging lens system with optical image " projection " on sensitive surface camera system and it is described." imaging " though state can be interpreted as so-called fuzzy picture, for example comprises the state of the some picture that the generation that caused by foozle is more spread than original some picture or owing to the restriction condition (size of optical system or cost) of design can only provide than the situation of the original conceivable point of design load self as big some picture.

In addition, as stated, the litura of the deterioration state of the resolution of main expression point picture is as status data Db, for example can represent a little as the size of the effective coverage of P1 or puts as the Luminance Distribution on the sensitive surface of P1 (CONCENTRATION DISTRIBUTION in image) etc.

[about the effect of camera system]

Then, the effect to above-mentioned camera system describes.

Example when at first, to obtaining recovery coefficient by the recovery coefficient acquisition device this recovery coefficient being stored in coefficient storage portion describes.

Project to quilt on the sensitive surface 21 through imaging lens system 10 and take the photograph the optical image of body and take, be imported into the diffusion of the point image state from above-mentioned the 1st view data G1 that is taken the photograph body of expression of imaging apparatus 20 outputs and obtain portion 73 by imaging apparatus 20.

The diffusion of the point image state of having imported the 1st view data G1 is obtained the status data Db of litura picture that portion 73 analyzes fringe and its analysis result of output expression of the some picture that the 1st view data G1 representes.

Recovery coefficient obtain the 78A of portion input from the diffusion of the point image state obtain portion's 73 outputs the litura picture status data Db and to be stored in ideal point in advance be data Dr as the status data of above-mentioned design data the storage part 72 or ideal point picture and obtain and the above-mentioned coefficient data Dk that representes this recovery coefficient K that exports as the corresponding recovery coefficient K of the fringe of P1 through the computing that utilizes both.

The coefficient data Dk that obtains the expression recovery coefficient K of the 78A of portion output from recovery coefficient is imported into coefficient storage portion 30, the recovery coefficient K that representes at the 30 packing coefficient data Dk of this coefficient storage portion.

And, as realizing that the diffusion of the point image state obtains the example of the function of portion 73, D * O analyzer (analyser) that the D that states after enumerating * O Labs company (France) makes.If adopt this D * O analyzer, can analyze the point obtained on the projection sensitive surface 21 fringe through the 1st view data G1 that imaging apparatus 20 is exported as P1.

[handling] about restoring

Then, explain that utilizing the recovery coefficient K that is stored in coefficient storage portion 30 that the 1st view data of exporting from imaging apparatus 20 is restored handles F and obtain the situation of resolution ratio by the 2nd view data of the higher image of the image of the 1st pictorial data representation.And in the explanation below, main explanation implements to restore the situation of handling F to the 1st view data of expression point picture.

Fig. 2 (a) representes that at the longitudinal axis light intensity E, transverse axis represent the figure of the light distribution of expression point picture on the coordinate of position of the directions X on the sensitive surface.Fig. 2 (b) representes that at the longitudinal axis position, the transverse axis of the Y direction on the sensitive surface represent on the coordinate of position of the directions X on the sensitive surface, expression constitute sensitive surface light receiving pixel each pixel region (representing with symbol Rg among the figure) and project to the figure of the some picture of this sensitive surface; Fig. 3 (a) is the figure at the image of the some picture shown in the image of the 1st pictorial data representation; Fig. 3 (b) is the figure at the image of the some picture shown in the image of the 2nd pictorial data representation.And, separately big or small consistent with each other of the pixel region (representing with symbol Rg ' among the figure) in the image that Fig. 3 (a) and Fig. 3 (b) represent respectively.And each the pixel region Rg that constitutes the light receiving pixel of sensitive surface 21 becomes mutual corresponding zone with image-region Rg ' in the image that the 1st view data G1 or the 2nd view data G2 represent.

In addition, Fig. 4 (a) representes that at the longitudinal axis light intensity E, transverse axis represent that the resolution Gao Shihui that is illustrated in imaging lens system 10 projects to the figure of the light distribution of the some picture on the sensitive surface 21 on the coordinate of position of the directions X on the sensitive surface.In addition, this it is also conceivable that to representing irrespectively that with optical system desirable point is as state.Fig. 4 (b) representes that at the longitudinal axis position, the transverse axis of the Y direction on the sensitive surface represent on the coordinate of position of the directions X on the sensitive surface, and each pixel region (representing with symbol Rg among the figure) that expression constitutes the light receiving pixel of sensitive surface reaches at the resolution Gao Shihui of imaging lens system 10 and projects to point on the sensitive surface 21 as the figure of P2.

Optical image through imaging lens system 10 is projected on the sensitive surface 21 is promptly put the maximum gauge M1 as the effective coverage R1 of P1, the size of the 3 continuous pixels of such light receiving pixel that relates to constitute sensitive surface 21 shown in Fig. 2 (b).In addition, this effective coverage R1 relates to the zone that adds up to 9 pixels by what vertical 3 pixels on the sensitive surface 21 and horizontal 3 pixels constituted.That is, effective coverage R1 is the zone of 9 pixel portion (3 pixels * 3 pixels) of occupying the light receiving pixel that constitutes sensitive surface 21.

In addition, shown in Fig. 2 (a), point has the 1/e of expression point as the peak strength Ep1 among the light distribution H1 of P1 as the effective coverage R1 of P1 ²The zone of above light intensity.

The point that projects on the above-mentioned sensitive surface 21 is taken by imaging apparatus 20 as P1, representes that this 1st view data G1 as P1 exports from imaging apparatus 20.

Shown in Fig. 3 (a), still be expressed as this effective coverage R1 ' relates to 9 pixel portion (3 pixels * 3 pixels) in image image as the corresponding image P1 ' of P1 with above-mentioned shown in the image Zg1 that the 1st view data G1 representes.

Then, 40 couples the 1st view data G1 of signal processing part that imported this view data G1 carry out the recovery processing F that utilizes recovery coefficient K1 and obtain the 2nd view data G2.

Shown in Fig. 3 (a) and (b); The effective coverage R1 ' of the image P1 ' of the some picture among the image P2 ' of the some picture among the image Zg2 that the 2nd corresponding view data G2 of image P1 ' of the some picture of representing with above-mentioned the 1st view data G1 representes, the effective coverage R2 ' of this image P2 ' and image Zg1 that above-mentioned the 1st view data G1 representes compares and reduces.Therefore, the some image pattern of in image Zg2, representing is compared also as the maximum gauge M1 ' (zone of 1 pixel portion of image-region Rg ') of the image P1 ' of the some picture of representing among the maximum gauge M2 ' (zones of 3 pixel portion of image-region Rg ') of P2 ' and the image Zg1 and is reduced.

Promptly; The image P2 ' of the some picture that the 2nd view data G2 shown in this Fig. 3 (b) representes and projects to that point on the sensitive surface 21 is taken as P2 (with reference to Fig. 4) and becomes equal image from the image of the represented some picture of the 1st view data of imaging apparatus 20 outputs to the resolution Gao Shihui at imaging lens system 10.

More specifically; Project to point that effective coverage R1 on the sensitive surface 21 relates to 9 pixel portion through imaging lens system 10 and implement to utilize the recovery of above-mentioned recovery coefficient K to handle the image P2 ' (with reference to Fig. 3 (b)) of the represented some picture of the 2nd view data G2 that F obtains taking as P1's (with reference to Fig. 2 (a) and (b)) and from the 1st view data G1 of imaging apparatus 20 outputs; Estimate to project to when the resolution of imaging lens system 10 is improved that point on the sensitive surface 21 is taken as P2 (the maximum gauge M2 of effective coverage R2 is included among the pixel region Rg, with reference to Fig. 4 (a) and (b)) and become equal image from the image of the represented some picture of the 1st view data G1 of imaging apparatus 20 outputs.

And the point that a pixel region Rg on the sensitive surface 21 shown in Fig. 4 (a) and (b) is comprised is as the effective coverage R2 of P2, and is same with above-mentioned situation as P1, is the 1/e that has some the peak strength Ep2 among the light distribution H2 that representes as P2 ²The zone of above light intensity.Here, the effective coverage R2 as P2 is included in a size among the pixel region Rg.

Like this, the 1st view data implement to restore is handled and the resolution of the represented image of the 2nd view data that obtains, can be higher than the resolution of the image of the 1st pictorial data representation.

In addition, restore to handle F through this, the identical image of image that obtains in the time of can obtaining with the depth of field that enlarges imaging lens system 10 is so above-mentioned recovery processing also is called the processing of the depth of field of amplifying camera lens 10 in fact.

And; Based on signal processing part 40, utilize among the recovery processing F of point that representes with the 1st view data G1 as the corresponding recovery coefficient K of the state of P1, can adopt above-mentioned spy to open in 2000-No. 123168 communiques the 0002nd～0016 section image restoration processing of being introduced etc.

In above-mentioned explanation, the situation of taking the some picture is illustrated; But; Projecting to quilt on the sensitive surface 21 through imaging lens system 10 takes the photograph the optical image of body and is considered the set that the some picture of body is taken the photograph in expression; So it is that the quilt of no matter taking is taken the photograph body for which kind of object, also can implements to restore and handle and generate the 2nd view data with the resolution presentation video of the image that is higher than the 1st pictorial data representation to above-mentioned the 1st view data.

[about the performance of camera system]

Then, the performance to the employed camera system that is made up of imaging lens system 10 and imaging apparatus 20 of above-mentioned camera system 100 describes.

Fig. 5 be transverse axis with logarithmic scale (m) the expression optical axis direction from the imaging lens system to the object point represent apart from U, the longitudinal axis with on the sensitive surface continuously on the coordinate of the corresponding length of the quantity (N) of the pixel region of arrangement, schematically illustrate when optical axis direction moves object point with project to sensitive surface on the figure of variation of maximum gauge of effective coverage of the corresponding some picture of this object point.

Here, object point is moved to from the position (being close to the position of about 0.01m) of the near point that roughly contacts with imaging lens system with respect to imaging lens system roughly the position of the far point of infinity (approximately at a distance of 10m position).

By 3 kinds of curves (solid line) of the series A among Fig. 5-1, A-2, A-3 expression, the variation of maximum gauge of effective coverage that imaging lens system 10 through camera system of the present invention projects to the each point picture of mutually different specific region on the sensitive surface 21 (specific region on the image height sensitive surface inequality each other) is shown schematically.In addition; The curve (dotted line) that series A w among Fig. 5 is represented, expression through the employed imaging lens system of existing camera system (for example vehicle mounted camera, mobile telephone camera, Medical Devices with camera etc.) project on the sensitive surface point as the variation of maximum gauge of effective coverage.

Can know according to Fig. 5; In existing camera system; The maximum gauge of the effective coverage through object point being projected in the some picture that forms on the sensitive surface 21, along with object point along the moving of optical axis direction, from the size that relates to 1 pixel portion to the size of 30 pixel portion till and alter a great deal.

On the other hand; The imaging lens system 10 that possesses through camera system 100 of the present invention and object point is projected to the maximum gauge of the effective coverage of the some picture that forms on the sensitive surface 21, among series A-1, A-2, the A-3 any relate to all that 3 pixel portion are above, size below 10 pixel portion.That is, with range-independence from imaging lens system 10 to object point and with the some picture of institute projection in the position on the sensitive surface (the for example image height on the sensitive surface) irrelevant, the change of the size of the effective coverage of the some picture on this sensitive surface is less.And, promptly projecting to the some picture on the sensitive surface for arbitrary position from three-dimensional arbitrary position through imaging lens system 10 from X, Y, Z direction, the size that also can be said to the effective coverage of its some picture changes less.

Fig. 6 is on the coordinate of transverse axis with the value (%) of representing the MTF characteristic apart from U, the longitudinal axis of the optical axis direction till logarithmic scale (m) expression is from the imaging lens system to the object point, schematically illustrate when optical axis direction moves object point with project to sensitive surface on the figure of variation of value (%) of the relevant MTF characteristic of the optical image of above-mentioned object point.

By 3 kinds of curves (solid line) of the relevant camera system of the present invention of the serial B-1 among Fig. 6, B-2, B-3 expression, the variation of value (%) of MTF characteristic that projects to the relevant optical image of the mutually different specific region (the mutually different specific region of image height) on the sensitive surface through imaging lens system 10 is shown schematically.In addition, the curve (dotted line) that the serial Bw among Fig. 6 is represented is the general variation of expression about the value (%) of the existing camera system MTF characteristic relevant with the optical image on projecting to sensitive surface.

Can know that by Fig. 6 in existing camera system, the value (%) of the MTF characteristic relevant with the optical image on projecting to sensitive surface 21 alters a great deal from 0% to surpassing till 80% the value.And, at imaging lens system 10 and the approaching near point of object point, become 0% position more near the object point in the zone of imaging lens system 10 (value of MTF characteristic is from 0% catadioptric zone) about being positioned at value than MTF characteristic, produce pseudo-the resolution.In addition, the far point that separates with object point at imaging lens system 10 becomes the object point in farther zone, 0% position (value of MTF characteristic is from 0% catadioptric zone) about being positioned at value than MTF characteristic, also produces pseudo-the resolution.

On the other hand, the imaging lens system 10 that possesses through camera system 100 of the present invention projects to the value (%) of the relevant MTF characteristic of optical image on the sensitive surface 21, is the size below 60% more than 10% for serial B-1, B-2, B-3, does not produce pseudo-the resolution.That is, with from imaging lens system 10 to object point till range-independence and irrelevant with the position (image height) on the sensitive surface of the optical image of institute projection, the change of the value of the MTF characteristic relevant with the optical image on projecting to sensitive surface reduces, and does not also produce pseudo-the resolution.And, be that three-dimensional optional position we can say also that through the relevant MTF characteristic of optical image that imaging lens system 10 projects on the sensitive surface change is less about position arbitrarily from X, Y, Z direction.

And; Imaging lens system 10 constitutes; About (for example the position arbitrarily of the X more than 4～5mm) 10 times, Y, Z direction projects to the optical image that quilt on the sensitive surface 21 is taken the photograph body through this imaging lens system 10, makes that also the value of the MTF characteristic relevant with this optical image just becomes from the focal length that leaves this imaging lens system 10.

In addition; With regard to this camera system 10; Imaging lens system and imaging apparatus constitute; For example be limited in more than the 10f about the Z direction, also be restricted in the scope of certain object height about X, Y direction, projecting to the some picture on the sensitive surface for the optional position from the X of object space, Y, Z direction, the maximum gauge of the effective coverage of this some picture becomes the above size of 3 pixels of the light receiving pixel that relates to the sensitive surface that forms imaging apparatus.

But; Imaging lens system 10 is not limited to satisfy the situation of this condition; If imaging lens system 10 constitutes with imaging apparatus 20; Optional position for from X, Y, Z direction projects to the some picture on the sensitive surface 21 through this imaging lens system 10, also makes the maximum gauge of effective coverage of this some picture become the above size of 3 pixels of the light receiving pixel that relates on the sensitive surface, the effect of the quality of the view data exported from imaging apparatus 20 of just can being improved.

As stated, according to camera system of the present invention, the lack of resolution of the image of the 1st pictorial data representation of as the past, exporting in camera system can merely only be implemented to restore processing (image processing) to the 1st view data and be able to compensation.Just, through the recovery of the 1st view data being handled the 2nd view data that can obtain to represent to have the image of predetermined resolution, so to projecting to that optical image on the sensitive surface is taken and the quality of the view data that obtains just is improved easily.

[about the effect of recovery coefficient acquisition device]

Below, the effect of recovery coefficient acquisition device 70A is at length described.

Function as recovery coefficient acquisition device 70A needs:

(1) uniformity in the picture is measured, judged to picture

(2) derivation provides the coefficient sets (recovery coefficient) that best recovery is handled

(3) the best coefficient sets of record

Each function is explained in more detail.

(1) be in the combination of each imaging lens system and imaging apparatus, the function of actual measurement, judgement imaging performance (resolution).As the mechanism of measuring optics point picture, the D * O analyzer of commercially available French D * O company is arranged based on the signal of telecommunication that obtains from imaging apparatus (the 1st view data).It is the mechanism that has utilized the fuzzy notion of the so-called B * U of expression that D * O company advocates, so can be according to obtain a picture (point is as all obtaining after optics point picture, the image processing) from the output signal of imaging apparatus.

Particularly; This D * O analyzer is analyzed through the view data (the 1st view data) that the chart of taking certain appointment (on white background, arranging the chart of numerous bullet) is obtained, and calculates the some picture size (http://www.dxo.com/jp/image_quality/dxo_analyzer) at the place of point arbitrarily on the sensitive surface of imaging apparatus.

And, measure the mechanism of optics point picture so long as can get final product according to measuring mechanism from the output calculated signals point picture of imaging apparatus (being transducer), pay no attention to its form.

On the other hand; Size according to the some picture under the situation of optical design value can be calculated by the instrument of this optical system of design; So, can judge the measurement point picture is from design load which kind of degree that squints through the size of " the measurement point picture " relatively measured by this " design load point picture " that calculates with by the measuring appliance of D * O analyzer etc.For example, the size of the measurement point picture under the assembly error situation is arranged, compare with design load point picture mostly and become big at optics.In addition; Project to that shape or the Luminance Distribution of effective coverage of the some picture on the sensitive surface of imaging apparatus is original to form point-symmetric shape or distribution; If but imaging lens system inclination or its axle offset, blur fuzzy before then producing partly, back, becomes so-called " single mode pasty state attitude ".Obtain thisly through more above-mentioned " design load point picture " and " measurement point picture ", and then can judge whether and to say so as design load apart from the departing from of design load.In addition, even be not limited to design load point picture, also defining ideal state at random, relatively its perfect condition (" ideal point picture ") and " measurement point picture " is judged its difference.

(2) be to carry out with nuclear Weiner filter (Kernel Wiener Filter) to handle, and obtain above-mentioned " measurement point picture " the stage that makes near the coefficient sets (recovery coefficient) of " design load point picture " or " ideal point picture " through calculating for basic recovery.Nuclear dimension receives that wave filter such as document vulture swamp are good one, mountain good fortune man of virtue and ability work down, exercise question " Kernel Wiener Filter ", 2003 Workshopon Information-Based Induction Sciences; (IBIS2003), Kyoto, Japan; Nov 11-12; 2003) shown in, the technical method as when original signal is observed through some filtering and with noise, from the observation signal that comprises noise, calculating original signal is widely used.Here; If original signal is made as " object that is taken "; Be made as " imaging lens system+imaging apparatus " as filtering; Observation signal is made as " picture signal (the 1st view data) ", and noise is made as " difference of design load point picture (perhaps ideal point picture) and measurement point picture ", then can use the nuclear Weiner filter and calculate " object that is taken ".

If " imaging lens system+imaging apparatus " in kind do not have all source of errors, then captured object just should be a picture signal, after handling through this recovery, obtains desirable " picture signal (the 2nd view data) " on the principle.In fact, also exist based on the measure error of original (1) etc., noise contribution is not all removed and a residual part, but the measurement point picture is reliably near the fact of design load point picture or desirable some picture, is improved as the quality of final image.

Particularly; Since certain source of error and optics point picture greater than design load, perhaps in imaging surface under the uneven situation; Also can through restore to handle with this some picture proofread and correct for less, or in imaging surface homogenizing, thereby can guarantee to stand practical performance.In addition, being not only based on the source of error of making, having to have in the optical system of performance lower in the design (optics point picture is greater than element spacing), also can look like to improve optical property in appearance through check point.Should apparent optical property raising if pursue, so the limiting resolution shown in then might surmounting in theory is very useful when the tendency of the miniaturization of considering Pixel Dimensions in recent years.

Here, limiting resolution is provided by the size of Airy disk, and the point of aberrationless lens is as the effective coverage (peak strength * (1/e of intensity ²)) radius R e and the radius R c that becomes intensity zero by stipulating with following formula.Pel spacing as the employed nearest cmos element of imaging apparatus is 2.2 microns, 1.75 microns, estimates that from now on 1.4 microns, 1.0 microns become main flow.As an example, if calculate Re and Rc, then be respectively with F2.8, wavelength 550nm:

Re (point is as the radius of the effective coverage of intensity)=0.82 λ F=0.82 * 2.8 * 550 * 0.001=1.26 micron (point is as 2.52 microns of the diameters of the effective coverage of intensity)

Rc (point becomes zero radius as intensity)=1.22 λ F=1.22 * 2.8 * 550 * 0.001=1.88 micron (point becomes 3.76 microns of zero diameters as intensity),

And pel spacing has surpassed diffraction limit.

Diffraction limit is prerequisite with the aberrationless, but the optical system of reality does not have aberrationless situation, and particularly in view of seeking miniaturization, cost degradation, aberration is residual on the contrary, haves no alternative but have the performance of compromise.Recovery based on the nuclear Weiner filter is handled, under this situation, and also can be with the degree of bringing up to practicality as the quality of final image.

Above-mentioned recovery is handled and is imagined on certain specific image planes or its (the fuzzy scope in preceding fuzzy back) execution very nearby; But in the countless image planes group that defocus direction corresponding with the change of photo distance; Handle if consider the recovery of the difference of elimination measurement point picture and design load point picture, then can enlarge the depth of focus.

In restoring the execution of handling, the noise contribution that should eliminate is of all kinds according to each " imaging lens system+imaging apparatus ", hopes that best recovery is carried out in the combination of each " imaging lens system+imaging apparatus " to be handled.But, restore identical the getting final product of algorithm of handling self, so " coefficient sets " of reference the best gets final product.

(3) be the stage that in fact makes the group combination " best coefficient sets " of " imaging lens system+imaging apparatus ".For this reason, should in certain recording medium, store the group that is used for carrying out coefficient sets that best recovery handles and it is added to " imaging lens system+imaging apparatus ".Therefore, need recording process.

Like this, through camera system is used as the group of " imaging lens system+imaging apparatus+recording medium ", thereby optical some picture (also claiming optics point picture) is corrected as the form that is fit to purposes, finally can obtain the image of good quality.Particularly, do not satisfy but the mechanism of the resolution that also can realize as the image after handling satisfying because of certain reason (manufacturing tolerance, original design load low) resolution even provide a kind of.In addition, can also provide the depth of focus consistent to enlarge mechanism with the characteristic of the group of each imaging lens system and imaging apparatus.

[about the variation of recovery coefficient acquisition device]

Below, the variation of recovery coefficient acquisition device is described.

In coefficient storage portion 30, store and can constitute by recovery coefficient acquisition device from the corresponding recovery coefficient K1 of the fringe of the some picture of the 1st pictorial data representation of imaging apparatus output: different with the recovery coefficient acquisition device 70A of above-mentioned the 1st example, below the recovery coefficient acquisition device 70B or the 3rd routine recovery coefficient acquisition device 70C of the 2nd example of explanation.

Fig. 7 is the figure of recovery coefficient acquisition device 70B of expression the 2nd example, this recovery coefficient acquisition device 70B the storage of coefficient storage portion from the candidate of each recovery coefficient corresponding with each fringe of the some picture that is divided into a plurality of kinds according to the selected recovery coefficient that goes out of the fringe of the some picture of the 1st pictorial data representation.

As shown in Figure 7, this recovery coefficient acquisition device 70B has: candidate coefficient storage portion 79 stores candidate K1, the K2 of each recovery coefficient corresponding with each fringe of the some picture that is divided into a plurality of kinds in advance The diffusion of the point image state is obtained portion 73, obtains through imaging lens system 10 and projects to point on the sensitive surface 21 as the fringe of P1; Reach recovery coefficient and obtain the 78B of portion, at candidate K1, the K2 of above-mentioned recovery coefficient ... Among the point selecting to represent with above-mentioned the 1st view data G1 as the corresponding recovery coefficient of the fringe of P1 (for example K1), K1 is stored in the coefficient storage portion 30 with this recovery coefficient.

This recovery coefficient acquisition device 70B obtains the litura of fringe that portion 73 obtains expression point picture as status data Db by the diffusion of the point image state; Recovery coefficient is obtained candidate K1, the K2 of the recovery coefficient of the 78B of portion from be stored in candidate coefficient storage portion 79 ... In the point selecting to represent as status data Db with litura as the corresponding recovery coefficient of the fringe of P1 (for example K1), the coefficient data Dk that representes this recovery coefficient K1 outputed in the coefficient storage portion 30 stores.

That is, in coefficient storage portion 30 storage from candidate K1, the K2 of each recovery coefficient corresponding with each fringe of the some picture that is divided into a plurality of kinds ... In the selected recovery coefficient that goes out of the fringe of the some picture represented according to the 1st view data G1.

Fig. 8 is the figure of recovery coefficient acquisition device 70C of expression the 3rd example, and this recovery coefficient acquisition device 70C store in coefficient storage portion: the recovery coefficient of having proofreaied and correct that from the candidate of the multiple recovery coefficient corresponding with each fringe of the some picture that is divided into a plurality of kinds, has further carried out correction according to the fringe of a picture according to the selected recovery coefficient that goes out of the fringe of this some picture of the 1st pictorial data representation.

As shown in Figure 8, this recovery coefficient acquisition device 70C has: candidate coefficient storage portion 79 stores candidate K1, the K2 of each recovery coefficient corresponding with each fringe of the some picture that is divided into a plurality of kinds in advance Ideal point is as storage part 72, store in advance resolution at imaging lens system 10 when high with project to through the high imaging lens system of this resolution desirable point on the sensitive surface 21 as the relevant design data of P1 or ideal point as status data data Dr; The diffusion of the point image state is obtained portion 73, obtains through imaging lens system 10 and projects to point on the sensitive surface 21 as the fringe of P1; And recovery coefficient is obtained the 78C of portion; Candidate K1, K2 from above-mentioned recovery coefficient ... The middle selection with above-mentioned as the corresponding recovery coefficient of the fringe of P1 (for example K1); And obtain expression through utilize above-mentioned as P1 fringe and be stored in computing that ideal point as status data is data Dr as the design data or the ideal point of the some picture in the storage part 72 in advance this recovery coefficient K1 proofreaied and correct the coefficient data Dk (K1 ') of the recovery coefficient K1 ' that has proofreaied and correct that forms, the recovery coefficient K1 ' that has proofreaied and correct of this coefficient data Dk (K1 ') expression is stored in the coefficient storage portion 30.

This recovery coefficient acquisition device 70C obtains portion 73 by the diffusion of the point image state and obtains expression and project to point on the sensitive surface 21 as the fringe data of the fringe of P1 through imaging lens system 10.Recovery coefficient is obtained candidate K1, the K2 of the recovery coefficient that the 78B of portion stores from candidate coefficient storage portion 79 ... The middle selection with above-mentioned as the corresponding recovery coefficient of the fringe of P1 (for example K1).And; Obtain through utilize above-mentioned as P1 fringe and be stored in ideal point in advance and this recovery coefficient K1 proofreaied and correct the recovery coefficient K1 ' that has proofreaied and correct that forms as the computing that the design data or the ideal point of the some picture in the storage part 72 as status data is data Dr, and the recovery coefficient K1 ' that this has been proofreaied and correct is stored in the coefficient storage portion 30.

That is storage in coefficient storage portion 30: the point of from the candidate of the multiple recovery coefficient corresponding, representing according to the 1st view data G1 with each fringe of the some picture that is divided into a plurality of kinds as the selected recovery coefficient (for example K1) that goes out of the fringe of P1 further enforcement corresponding to the recovery coefficient K1 ' that has proofreaied and correct of the correction of above-mentioned fringe.

And; As shown in Figure 9, camera system of the present invention can be with recovery

coefficient acquisition device

70A, 70B or 70C etc. have camera system 100 in the recovery coefficient acquisition device 70 of identical functions or the housing that coefficient storage portion 30 is arranged on above-mentioned camera system '.

And, shown in figure 10, camera system of the present invention also can be the signal processing part 40 that is provided with built-in above-mentioned recovery coefficient acquisition device 70 or coefficient storage portion 30 ' camera system 100 ".That is, can make signal processing part 40 ' double as recovery coefficient acquisition device 70.

[about the variation of each constituent element]

Below, the variation of the constituent element of the camera system of the 1st execution mode is described.

Signal processing unit is not limited to the pixel region that is added up to more than 9 pixels by relating to more than vertical 3 pixels and more than horizontal 3 pixels on the sensitive surface is restored the situation of processing as least unit, also can be with by vertically less than 3 pixels or laterally restore processing less than 3 pixels relating to less than the pixel region that adds up to 9 pixels of constituting as least unit.

In addition, signal processing part is not limited to obtain through the computing of the 1st view data of the fringe of utilizing expression point picture the situation of recovery coefficient, also can obtain recovery coefficient through alternate manner.

In addition; Signal processing part is not limited to the pixel region of the minimum of the whole effective coverages that comprise the some picture that projects on the sensitive surface is carried out the situation about handling of restoring as least unit, also can be with comprising whole effective coverages but be not that minimum pixel region is carried out to restore as least unit and handled.

And; Signal processing part be not limited to carry out restore handle so that the size of the effective coverage of the some picture in the image of the 2nd pictorial data representation less than the size of the effective coverage of the some picture in the image of the 1st pictorial data representation situation, can also be carry out restore handle so that the size of the effective coverage of the some picture in the image of the 1st pictorial data representation more than or equal to the situation of the size of the effective coverage of the some picture in the image of the 2nd pictorial data representation.

(the 2nd execution mode)

Figure 11 is the block diagram of brief configuration of the camera system of expression the 2nd execution mode of the present invention.

[about the structure of camera system]

Below the structure of the camera system of the 2nd execution mode is described.

Camera system of the present invention 200 shown in Figure 11 has: imaging lens system 10; Imaging apparatus 20 has that two-dimentional shape is arranged a plurality of light receiving pixels and the sensitive surface 21 that constitutes, and takes the photograph the optical image P1 of body and take project to quilt on the sensitive surface 21 through imaging lens system 10, and this quilt of output expression is taken the photograph the 1st view data G1 of body; Coefficient storage portion 30; When the maximum gauge in the effective coverage that projects to the some picture on the sensitive surface 21 through pick-up lens 10 related to big or small more than 3 pixels, storage and the point of being represented by the 1st view data G1 that exports from imaging apparatus 20 were as the corresponding recovery coefficient K of the fringe of P1; And signal processing part 40, utilize the recovery coefficient K be stored in coefficient storage portion 30 that the 1st view data G1 is implemented to generate and when the resolution of imaging lens system 10 is high, handle from the recovery of the 2nd equal view data G2 of the 1st view data G1 of imaging apparatus 20 outputs.

This signal processing part 40 with by more than vertical 3 pixels on the sensitive surface 21 and the pixel region that adds up to more than 9 pixels that relates to that constitutes more than horizontal 3 pixels be that least unit is carried out to restore and handled F.

The structure of imaging lens system 10 is identical with the structure of above-mentioned the 1st execution mode.

At this, project to point on the sensitive surface 21 becomes this effective coverage on the point that projects on the sensitive surface 21 comprises maximum light receiving pixels as the effective coverage of P1 the direction as the maximum gauge of the effective coverage of P1 diameter.

And the direction of representing with arrow Z among Figure 11 is the optical axis direction of imaging lens system 10, and the direction of representing with arrow X, Y is the direction parallel to sensitive surface 21.

At this, the recovery coefficient acquisition device 70A that is arranged at the outside of camera system 100 obtain with the point of representing by the 1st view data G1 from imaging apparatus 20 outputs as the corresponding recovery coefficient K of the fringe of P1, store this recovery coefficient K in coefficient storage portion 30.

This recovery coefficient acquisition device 70A has: ideal point is as storage part 72, store in advance when in the optical system that comprises imaging lens system 10, not having error fully point as relevant design data or with the ideal point that is superior to it as the relevant ideal point of state as any the data Dr in the status data; The diffusion of the point image state is obtained portion 73, and the litura of analyzing the fringe of the some picture of being represented by the 1st view data G1 from imaging apparatus 20 outputs and obtaining its analysis result of expression is as status data Db; Point is obtained portion 74 as diameter, is used to obtain through imaging lens system 10 project to point on the sensitive surface 21 as the maximum gauge of P1 effective coverage; Judging part 76 judges whether obtain the above-mentioned maximum gauge that portion 74 obtains by point as diameter relates to the size more than 3 pixels on the sensitive surface 21; And recovery coefficient is obtained the 78A of portion; Be judged as above-mentioned maximum gauge when relating to big or small more than 3 pixels on the sensitive surface 21 by judging part 76; The litura that input obtains portion 73 output from the diffusion of the point image state is as status data Db and to be stored in ideal point be data Dr as design data the storage part 72 or ideal point as status data; And through the computing that utilizes both obtain the expression and the coefficient data Dk of the point shown in above-mentioned the 1st view data G1 as the corresponding recovery coefficient K of the fringe of P1, the recovery coefficient K that this coefficient data Dk is represented is stored in coefficient storage portion 30.

[about the effect of camera system]

Then, the effect to above-mentioned camera system describes.

1 example when at first, to obtaining recovery coefficient by the recovery coefficient acquisition device this recovery coefficient being stored in coefficient storage portion describes.

Project to quilt on the sensitive surface 21 through imaging lens system 10 and take the photograph the optical image of body and take, be imported into from above-mentioned the 1st view data G1 that is taken the photograph body of expression of imaging apparatus 20 outputs that the diffusion of the point image state is obtained portion 73 and point is obtained portion 74 as diameter by imaging apparatus 20.

The diffusion of the point image state of having imported the 1st view data G1 is obtained the litura of fringe and its analysis result of output expression that portion 73 analyzes the some picture that the 1st view data G1 representes as status data Db.

In addition, the point of having imported the 1st view data G1 is obtained portion 74 as diameter and is obtained the point that projects on the sensitive surface 21 as the maximum gauge of the effective coverage of P1 and the diameter data Dm of this maximum gauge of output expression.Whether judging part 76 judging points of having imported the diameter data Dm that representes above-mentioned maximum gauge relate to the size more than 3 pixels on the sensitive surface 21 as the maximum gauge of the effective coverage of P1, are being judged as maximum gauge output signal Te when relating to big or small more than 3 pixels.

Import the recovery coefficient of this signal Te and obtained the 78A of portion; Input obtains portion 73 output from the diffusion of the point image state litura is as status data Db and to be stored in ideal point in advance be data Dr as the design data or the ideal point of storage part 72 as status data; And obtain and put through the computing that utilizes both, the coefficient data Dk of this recovery coefficient of output expression K as the corresponding recovery coefficient K of the fringe of P1.

Obtain the recovery coefficient K that the coefficient data Dk of the 78A of portion output is imported into coefficient storage portion 30 and representes at the 30 packing coefficient data Dk of this coefficient storage portion from recovery coefficient.

And, obtain portion 73 and put the example of obtaining the function of portion 74 as diameter as realization diffusion of the point image state, the D * O analyzer of the D that states after enumerating * O company (France) system.According to this D * O analyzer, through analyzing from the 1st view data G1 of imaging apparatus 20 outputs, can obtain the point that projects on the sensitive surface 21 as the fringe (deterioration state of resolution) of P1 or the maximum gauge of effective coverage.

As above-mentioned, at the 30 storage recovery coefficient K of coefficient storage portion, camera system 100 becomes the state that can carry out the recovery processing thus.

[handling] about restoring

Utilization is stored in the recovery coefficient K of coefficient storage portion 30; Handle F to carrying out to restore from the 1st view data of imaging apparatus 20 outputs; Obtain the method for resolution, can take and the identical method of above-mentioned the 1st execution mode than the 2nd view data of the image of the figure image height of the 1st pictorial data representation.

[about the variation of recovery coefficient acquisition device]

Below, the variation of recovery coefficient acquisition device is described.

In coefficient storage portion 30 storage with can constitute by recovery coefficient acquisition device from the corresponding recovery coefficient K1 of the fringe of the some picture of the 1st pictorial data representation of imaging apparatus output: different with the recovery coefficient acquisition device 70A of above-mentioned the 1st example, below the 2nd routine recovery coefficient acquisition device 70B or the 3rd routine recovery coefficient acquisition device 70C of explanation.

Figure 12 is the figure of the recovery coefficient acquisition device 70B of expression the 2nd example, and Figure 13 is the figure of the recovery coefficient acquisition device 70C of expression the 3rd example.Figure 14 is the figure that expression possesses the camera system of recovery coefficient acquisition device, and Figure 15 is illustrated in the figure that signal processing part possesses the camera system of recovery coefficient acquisition device and coefficient storage portion.And, in Figure 12～Figure 15,, use the identical symbolic representation of situation with the recovery coefficient acquisition device 70A of the 1st example about having the constituent element of recovery coefficient acquisition device 70A identical functions with above-mentioned the 1st example.

Shown in figure 12, the recovery coefficient acquisition device 70B of the 2nd example has: candidate coefficient storage portion 79 stores candidate K1, the K2 of each recovery coefficient corresponding with each fringe of the some picture that is divided into a plurality of kinds in advance The diffusion of the point image state is obtained portion 73, and the fringe of the some picture that the 1st view data G1 from imaging apparatus 20 output is represented is analyzed and obtained the recovery coefficient that the litura of its analysis result of expression states as status data Db backward and obtains the 78B of portion output; Point is obtained portion 74 as diameter, is used to obtain through imaging lens system 10 project to point on the sensitive surface 21 as the maximum gauge of the effective coverage of P1; Judging part 76 judges whether obtain the above-mentioned maximum gauge that portion 74 obtains by point as diameter relates to the size more than 3 pixels on the sensitive surface 21; And recovery coefficient is obtained the 78B of portion; Be judged as above-mentioned maximum gauge by judging part 76 when relating to big or small more than 3 pixels on the sensitive surface 21; Candidate K1, K2 from above-mentioned recovery coefficient ... In the point selecting to represent as status data Db with above-mentioned litura as the corresponding recovery coefficient of the fringe of P1 (for example K1), K1 is stored in the coefficient storage portion 30 with this recovery coefficient.

This recovery coefficient acquisition device 70B obtains portion 74 by point as diameter and obtains through imaging lens system 10 and project to point on the sensitive surface 21 as the maximum gauge of the effective coverage of P1, with the diameter data Dm of this maximum gauge of expression to judging part 76 outputs.The judging part 76 of having imported diameter data Dm judges whether above-mentioned maximum gauge relates to the above size of 3 pixels on the sensitive surface 21, is being judged as when relating to big or small more than 3 pixels, and the signal Te of this situation of expression is obtained the 78B of portion output to recovery coefficient.The recovery coefficient of having imported signal Te is obtained candidate K1, the K2 of the recovery coefficient that the 78B of portion stored from candidate coefficient storage portion 79 ... In the point selecting to represent as status data Db with above-mentioned litura as the corresponding recovery coefficient of the fringe of P1 (for example K1), the coefficient data Dk that representes this recovery coefficient K1 outputed in the coefficient storage portion 30 stores.

That is, in coefficient storage portion 30 storage from candidate K1, the K2 of each recovery coefficient corresponding with each fringe of the some picture that is divided into a plurality of kinds ... In the selected recovery coefficient (for example K1) that goes out of the fringe of the some picture represented according to the 1st view data G1.

On the other hand, shown in figure 13, the recovery coefficient acquisition device 70C of the 3rd example has: candidate coefficient storage portion 79 stores candidate K1, the K2 of each recovery coefficient corresponding with each fringe of the some picture that is divided into a plurality of kinds in advance Ideal point is as storage part 72, store in advance with when the resolution of imaging lens system 10 is high through the high imaging lens system of this resolution project to desirable point on the sensitive surface 21 as relevant design data or ideal point as status data data Dr; The diffusion of the point image state is obtained portion 73, and the litura that its analysis result of expression was analyzed and obtained to the fringe of the some picture that the 1st view data G1 from imaging apparatus 20 output is represented is as status data Db, and the recovery coefficient of stating is backward obtained the 78C of portion output; Point is obtained portion 74 as diameter, is used to obtain through imaging lens system 10 project to point on the sensitive surface 21 as the maximum gauge of the effective coverage of P1; And judging part 76, judge whether obtain the above-mentioned maximum gauge that portion 74 obtains through point as diameter relates to the size more than 3 pixels on the sensitive surface 21.

And; This recovery coefficient acquisition device 70C has recovery coefficient and obtains the 78C of portion; It is being judged as above-mentioned maximum gauge when relating to big or small more than 3 pixels on the sensitive surface 21 by judging part 76; Candidate K1, K2 from above-mentioned recovery coefficient ... In select and obtain point that litura that portion 73 exports representes as status data Db from above-mentioned diffusion of the point image state as the corresponding recovery coefficient of the fringe of P1 (for example K1); Obtain through utilizing above-mentioned litura as status data Db and be stored in the coefficient data Dk (K1 ') of the computing recovery coefficient K1 ' that this recovery coefficient K1 is proofreaied and correct, that expression has been proofreaied and correct that ideal point as status data is data Dr as the design data or the ideal point of the some picture in the storage part 72 in advance, the recovery coefficient K1 ' that has proofreaied and correct of this coefficient data Dk (K1 ') expression is stored in the coefficient storage portion 30.

This recovery coefficient acquisition device 70C obtains portion 74 by point as diameter and obtains through imaging lens system 10 and project to point on the sensitive surface 21 as the maximum gauge of the effective coverage of P1, to the diameter data Dm of judging part 76 these maximum gauges of output expression.The judging part 76 of having imported diameter data Dm judges whether above-mentioned maximum gauge relates to the above size of 3 pixels on the sensitive surface 21, if be judged as when relating to above big or small of 3 pixels, the signal Te that then will represent this situation obtains the 78B of portion to recovery coefficient and exports.The recovery coefficient of having imported signal Te is obtained candidate K1, the K2 of the recovery coefficient that the 78B of portion stored from candidate coefficient storage portion 79 ... In the point selecting to represent as status data Db with above-mentioned litura as the corresponding recovery coefficient of the fringe of P1 (for example K1); Obtain through utilizing above-mentioned litura as status data Db and be stored in the recovery coefficient K1 ' that has proofreaied and correct that computing that ideal point as status data is data Dr as the design data or the ideal point of the some picture in the storage part 72 is further proofreaied and correct this recovery coefficient K1 in advance, and the recovery coefficient K1 ' that this has been proofreaied and correct is stored in coefficient storage portion 30.

That is the recovery coefficient K1 ' that has proofreaied and correct that, according to the fringe of above-mentioned some picture the point from the candidate of the multiple recovery coefficient corresponding with each fringe of the some picture that is divided into a plurality of kinds, represented according to the 1st view data G1 is further proofreaied and correct as the selected recovery coefficient (for example K1) that goes out of the fringe of P1 in coefficient storage portion 30 storage.

And camera system 200 can possess recovery

coefficient acquisition device

70A, 70B, 70C as its part, and among recovery

coefficient acquisition device

70A, 70B and the 70C any also can be set.

In addition, camera system 200 shown in Figure 14 ' be is built in the camera system in the housing of above-mentioned camera system with having recovery coefficient acquisition device 70 with identical functions such as recovery

coefficient acquisition device

70A, 70B or 70C.Camera system can constitute like this.

And camera system 200 shown in Figure 15 " is in signal processing part 40 ' built-in as the above-mentioned recovery coefficient acquisition device 70 and the camera system of coefficient storage portion 30.Camera system also can constitute like this.

[about the performance of camera system]

Then, the above-mentioned camera system 200 employed camera systems that are made up of imaging lens system 10 and imaging lens system 20 can have and the equal performance of above-mentioned the 1st execution mode.

As above-mentioned; Camera system according to the 2nd execution mode of the present invention; Do not need as before when the resolution from the image of the 1st pictorial data representation of camera system output reaches predetermined level, not confirm its reason and to regulate or assemble again imaging lens system etc. again; Merely storage and the corresponding recovery coefficient of fringe of putting picture in the coefficient storage unit; Only the 1st view data implement to restore is handled (image processing), can obtain representing having the 2nd view data of the image of predetermined resolution, so to projecting to that optical image on the sensitive surface is taken and the quality of the view data that obtains just can be improved easily.In addition, the lack of resolution in the camera system is restored easily.

[about the variation of each constituent element]

Below, the variation of the constituent element of the camera system of the 2nd execution mode is described.

In addition; Signal processing part is not limited to the situation about handling of restoring is carried out as least unit in the minimum pixel zone of the whole effective coverages that comprise the some picture that projects on the sensitive surface, also can be with comprising whole effective coverages but be not that minimum pixel region is carried out to restore as least unit and handled.

And; Signal processing part be not limited to carry out restore handle so that the size of the effective coverage of the some picture in the image of the 2nd pictorial data representation less than the situation of the size of the effective coverage of the some picture in the image of the 1st pictorial data representation, can also carry out restore handle so that the size of the effective coverage of the some picture in the image of the 1st pictorial data representation more than or equal to the size of the effective coverage of the some picture in the image of the 2nd pictorial data representation.

And; Possess above-mentioned camera system camera head of the present invention, portable terminal device, mobile unit, and Medical Devices etc. require the dark device of the depth of field, can improve easily likewise that camera system that each device possessed taken the optical image that projects to sensitive surface and the quality of the view data that obtains with above-mentioned.

And; Camera system of the present invention; Imaging lens system and imaging apparatus can constitute: for for example be limited in being restricted to the scope of certain object height about the Z direction in more than the 10f, about X, Y direction the position arbitrarily from the X of object space, Y, Z direction project to the some picture on the sensitive surface, the maximum gauge of the effective coverage of this some picture also becomes the above size of 3 pixels of the light receiving pixel that relates to the sensitive surface that forms imaging apparatus.

In addition; Imaging lens system preferably constitutes; About projecting to the optical image that quilt on the sensitive surface is taken the photograph body from the optional position of the X more than 10 times of the focal length that leaves this imaging lens system, Y, Z direction through this imaging lens system, the value of the MTF characteristic relevant with this optical image just becomes.And; The expression of " leaving the position more than 10 times of the focal length of imaging lens system " " will constitute be made as the reference position in the lens face of imaging lens system, the optical axis direction from this reference position along this imaging lens system (Z-direction) leaves more than 10 times of focal length to object side " near the position of the optical axis intersection of the face of object side and this imaging lens system.

And; This camera system; Imaging lens system and imaging apparatus also can constitute; Only for projecting to the some picture on the sensitive surface from the limited position of any direction at least about X, Y, Z direction through imaging lens system, the maximum gauge of the effective coverage of this some picture becomes the above size of 3 pixels that relates to the light receiving pixel that forms sensitive surface.In this case, the 1st view data that the maximum gauge that only expression is projected to the effective coverage of the some picture on the sensitive surface becomes the zone of the size more than 3 pixels that relate to light receiving pixel is implemented to restore and is handled, and can obtain the 2nd view data.

The dark device of the body depth of field is taken the photograph in the requirement of camera head of the present invention, portable terminal device, mobile unit and Medical Devices etc. that possesses the camera system of above-mentioned the 1st execution mode or the 2nd execution mode, can with the above-mentioned quality that take the view data that obtains to optical image of the sensitive surface that projects to the camera system that each device possessed that likewise improves easily.

And; The camera system of the 1st execution mode of the present invention and the 2nd execution mode can constitute the optical image that only will be taken the photograph body through the optics that is made up of axisymmetric shape and project on the sensitive surface; Perhaps, also can constitute the optical image that will be taken the photograph body through the optics that is made up of non-axisymmetric shape projects on the sensitive surface.And, the lens that the preferred depth of field of above-mentioned imaging lens system is dark.Promptly; Preferably imaging lens system and imaging apparatus are constituted: through being taken the photograph moving or the focal adjustments of imaging lens system etc. of body; Changed even take the photograph the state that the optical image of body attendes institute's projection at sensitive surface, the variation of the fringe of the some picture that projects on the sensitive surface is reduced.More specifically, imaging lens system and imaging apparatus are constituted the size of the effective coverage that makes the some picture that projects on the sensitive surface and the variation of contrast reduces.But camera system is not limited to possess the situation of the dark imaging lens system of the depth of field, also can possess the shallow imaging lens system of the depth of field.

In addition, the imaging apparatus that is used for the camera system of above-mentioned the 1st execution mode and the 2nd execution mode can be made as CCD element or cmos element.

[about the manufacturing approach of camera system]

Below, with reference to the manufacturing approach of Figure 11,12, explanations such as 13 camera system of the present invention, that is, the recovery coefficient storing predetermined to the camera system that does not have storing predetermined recovery coefficient, thus the method for the camera system of having stored recovery coefficient made.

The manufacturing approach of this camera system is that storage recovery coefficient and making can be carried out and restores the camera system 200A that stores recovery coefficient, the 200B that handles in coefficient storage portion 30 ... Method.

And,

camera system

200A, 200B ... Be with reference to the identical system of the camera system of Figure 11～Figure 15 explanation 200.

The manufacturing approach of above-mentioned camera system is

camera system

200A, 200B ... Manufacturing approach, this camera system has: imaging lens system 10; Imaging apparatus 20 has that two-dimentional shape is arranged a plurality of light receiving pixels and the sensitive surface 21 that constitutes, takes the photograph the optical image of body and takes and export the 1st view data G1 that this quilt of expression is taken the photograph body project to quilt on the sensitive surface 21 through imaging lens system 10; Signal processing part 40, will by more than vertical 3 pixels on the sensitive surface 21 and relating to of constituting more than horizontal 3 pixels pixel region that adds up to more than 9 pixels as least unit the 1st view data G1 is implemented to generate and when the resolution of imaging lens system 10 is high, handles F from the recovery of the 2nd equal view data G2 of the 1st view data G1 of imaging apparatus 20 outputs; And coefficient storage portion 30, store the recovery coefficient K that is used to restore processing; The recovery coefficient K that this camera system utilization is stored in the coefficient storage portion 30 carries out the recovery processing.

This manufacturing approach will be put as P1 through imaging lens system 10 and project on the sensitive surface 21, and storage and the point of being represented by the 1st view data G1 that exports from imaging apparatus 20 are as the corresponding recovery coefficient K of the state of P1 in coefficient storage portion 30.

The manufacturing approach of this camera system adopts the recovery coefficient acquisition device 70A of the 1st example of utilizing above-mentioned the 2nd execution mode, the recovery coefficient acquisition device 70B of the 2nd example or the recovery coefficient acquisition device 70C of the 3rd example to obtain recovery coefficient and this recovery coefficient is stored in each

camera system

200A, 200B ... The method of coefficient storage portion.

Below, explanation utilizes the manufacturing approach of camera system of recovery coefficient acquisition device 70C of recovery coefficient acquisition device 70B and the 3rd example of recovery coefficient acquisition device 70A, the 2nd example of the 1st example particularly.And; For camera system 100A, 100B ... And the recovery coefficient acquisition device 70B of the recovery coefficient acquisition device 70A of above-mentioned the 1st example, the 2nd example, and structure and the effect etc. of the recovery coefficient acquisition device 70C of the 3rd example; Identical with the content of relevant above-mentioned camera system 100; So omit the explanation of repetition, the content with the manufacturing approach of the unduplicated camera system of explanation of above-mentioned camera system 100 described.

" about the manufacturing approach of the camera system corresponding " with the recovery coefficient acquisition device 70A of the 1st example

Be stored in respectively in the corresponding manufacturing process of " 1 pair 1 " of camera system at the recovery coefficient that will obtain separately each camera system, need carry out:

(1) uniformity in the picture is measured, judged to picture,

(2) derivation provides the coefficient sets (recovery coefficient) that best recovery is handled,

(3) the best coefficient sets of record.

As each function, can be useful in the function that [effect of recovery coefficient acquisition device] of above-mentioned the 1st execution mode explained.

" about the manufacturing approach of the camera system corresponding " with the recovery coefficient acquisition device 70B of the 2nd example

Above-mentioned the 2nd method for optimizing as correcting optical system that is made up of imaging lens system, imaging apparatus, signal processing circuit is made in narration, but has imagined the situation of producing a large amount of digital cameras at an easy rate as its location.In its manufacturing process, need carry out:

(1) structure is used to restore the storehouse of coefficient (recovery coefficient) group of processing,

(2) uniformity in the picture is measured, judged to picture,

(3) coefficient sets that from the storehouse, provides the recovery of the best of group unit to handle,

(4) coefficient sets of the best of record group unit.

Illustrate in greater detail each function.

(1) is in advance the imaging lens system that roughly can enlist the services of the quantity of overall trend (for example 1/10th of all lot numbers) to be measured, its resolution trend (bad trend) is divided into groups.To handle the recovery of its best of respectively organizing and carry out computing, obtaining respectively, the coefficient sets of the best of the unit of group makes up the storehouse.On the ideal, it is desirable as the 1st example, pressing " 1 pair 1 " corresponding distribution coefficient group, is not suitable in the time of still under mass-produced situation, maybe will suppressing cost.Therefore, as present embodiment, integral body is divided into group in a way, make the storehouse of obtaining the optimum solution under its group unit.

(2) identical with (1) of the 1st example, still look like to belong to the judgement of which group of obtaining with (1) of above-mentioned the 2nd example according to measurement point.In fact, when carrying out above-mentioned grouping, also be assigned to group (for example 9/10ths of all lot numbers) for beyond measuring in advance.

(3) be that extraction is through the stage of the coefficient sets of the best of the group of above-mentioned (2) judgement from the storehouse, selecteed coefficient sets is applied to the group of this " imaging lens system+imaging apparatus ".At this moment, do not obtain optimum system array one by one to the group of each " imaging lens system+imaging apparatus ".Thus, can shorten for the 1st routine required operation time, can realize a large amount of productions at an easy rate.

(4) identical with (3) of the 1st example.

" about the manufacturing approach of the camera system corresponding " with the recovery coefficient acquisition device 70C of the 3rd example

Above-mentioned the 3rd method for optimizing as correcting optical system that is made up of imaging lens system, imaging apparatus, signal processing circuit is made in narration, but has imagined the situation of producing a large amount of digital cameras at an easy rate as its location.In its manufacturing process, need carry out:

(2) uniformity in the picture is measured, judged to picture,

(3) coefficient sets that from the storehouse, provides best recovery to handle,

(4) part is revised this coefficient sets,

(5) write down the coefficient sets that is modified.

Illustrate in greater detail each function.

(1) (2) (3) are identical with (1) (2) (3) of the 2nd example.

(4) be the process that part is revised the coefficient sets that is extracted.Coefficient sets becomes the arrangement of certain numerical value, but to " imaging lens system+imaging apparatus " of only revising its part necessary modifications in addition.With optimized above-mentioned the 1st example of all coefficient sets is different, only revise the part of coefficient, so the time is gone up short getting final product.

(5) be the stage of the coefficient sets of having proofreaied and correct of record modification, constitute the group of " imaging lens system+imaging apparatus+recording medium " thus.

As above such, the camera system of the manufacturing approach manufacturing through camera system of the present invention can easily improve takes the quality of the view data that obtains to projecting to optical image on the sensitive surface.

[about the lens arrangement and the effect of imaging lens system]

Then, structure and the effect to the camera system of above-mentioned

camera system

100 and 200 employed embodiment 1 describes particularly.The imaging lens system 10A that states after the camera system of the foregoing description 1 is employed etc. becomes the embodiment of above-mentioned imaging lens system 10.

And, above-mentioned imaging lens system 10 as after state from object side (thing side) and have successively: the 1st set of lenses G-1 that constitutes by at least 1 lens, have positive focal power, and the 2nd set of lenses G-2 that constitute by 1 lens at least, that have positive focal power.

" about the camera system of embodiment 1 "

Figure 16 is the sectional view of brief configuration of the imaging lens system 10A that is made up of 3 einzel lenses of expression embodiment 1; Figure 17 (a)～(d) representes to have through imaging lens system 10A projection on the coordinate of the amount Ud (μ m) of the optical axis direction (Z-direction) of the sensitive surface of the picture of being taken the photograph body, value (%) that the longitudinal axis is represented the MTF characteristic at transverse axis, is illustrated in the figure of variation of the value (%) of the MTF characteristic that projects to the optical image on this sensitive surface when with respect to above-mentioned imaging lens system sensitive surface being defocused.Here, the de-focus region of sensitive surface 21A is 400 μ m.

In more detail, above-mentioned Figure 17 (a)～(d) is the figure that is illustrated in the variation of fixing the value (%) of being taken the photograph MTF characteristic when under the state of body with respect to the position of imaging lens system 10A sensitive surface 21A being defocused, relevant with the optical image that is projected as various image heights.Figure 17 (a) is the figure of variation of value of MTF characteristic of the spatial frequency of 20/mm of expression; Figure 17 (b) is the figure of variation of value of MTF characteristic of the spatial frequency of 30/mm of expression, and Figure 17 (c) is that figure, Figure 17 (d) of variation of value of the MTF characteristic of 40/mm of expression spatial frequency is the figure of variation of value of MTF characteristic of the spatial frequency of 50/mm of expression.

And; With regard to the transverse axis Ud of expression amount shown in Figure 17; The direction that direction (value of Ud is near the direction of 400 μ m) expression imaging lens system and the sensitive surface that its value increases separates, the direction that value reduces (value of Ud near 0 direction) is represented sensitive surface and the approaching direction of imaging lens system.

Shown in figure 16, imaging lens system 10A along optical axis C (Z axle) from object side (arrow the figure-Z direction side) be arranged with aperture diaphragm Sat successively respectively, corresponding to the 1st einzel lens La1 of the 1st set of lenses G-1, constitute corresponding to the 2nd einzel lens La2, the optics GLa1 of the 2nd set of lenses G-2.And lens face R1 shown in Figure 16, R3 represent the face of the light incident side of each einzel lens La1～La2 respectively, and lens face R2, R4 represent the face of the exiting side of each einzel lens La1～La2 respectively.The optical image that to be taken the photograph body through above-mentioned imaging lens system 10A projects on the sensitive surface 21A.

And; Object side at sensitive surface 21A; According to structure optimization configuration cover glass, low pass filter or the infrared intercepting filter etc. of camera system, imagine the example of these the optics GLa1 that does not have focal power that is the parallel flat shape in configuration shown in Figure 16.In addition, aperture diaphragm Sat does not represent shape or size, and the position on the expression optical axis Z.

In addition, in Figure 16, to off-axis ray Ja6,6 light Ja1, Ja2, Ja3, Ja4, Ja5, Ja6 are shown successively from the low side of image height with maximum field of view's angle incident from axle glazed thread Ja1.

And 6 MTF curve M ta20 of record are illustrated in the variation of value of MTF characteristic of spatial frequency of 20/mm of the position of above-mentioned 6 ray casts to the sensitive surface 21A among Figure 17 (a).6 MTF curve M ta30 of record are illustrated in the variation of value of MTF characteristic of spatial frequency of 30/mm of position same as described above among Figure 17 (b); 6 MTF curve M ta40 of record also represent the variation of value of MTF characteristic of spatial frequency of 40/mm of position same as described above among Figure 17 (c), and 6 MTF curve M ta50 of record are also illustrated in the variation of value of MTF characteristic of spatial frequency of 50/mm of position same as described above among Figure 17 (d).

In addition, in formation example shown in Figure 16, be illustrated between the 2nd einzel lens La2 and the sensitive surface 21A example of configuration optics GLa1, but between each lens, also can dispose low pass filter or by the various filters of specific band.Perhaps, impose the surface treatment (coating) that has with the same effect of various filters at lens face from any lens of the 1st einzel lens La1 to the 2 einzel lens La2.

This imaging lens system 10A has from the thing side successively: have the 1st set of lenses G-1 of positive focal power einzel lens La1, have the einzel lens La2 of the 2nd set of lenses G-2 of positive focal power.

The einzel lens La1 of the 1st set of lenses G-1 is with the meniscus shape of convex surface towards the thing side, and the einzel lens La2 of the 2nd set of lenses G-2 also is with the meniscus shape of convex surface towards the thing side.

Below, the design data of the related imaging lens system 10A of embodiment 1 is described.

Table 1 illustrates lens data and various data, and table 2 illustrates each coefficient of the aspheric surface formula on each aspheric surface, and table 3 illustrates the concise and to the point specification of imaging lens system 10A.

[table 1]

Embodiment 1 (two lens)

The face number	Ri	Di	Ndj	v?dj
					Aperture diaphragm	∞	0.150	?	?
1*	0.992	0.597	1.53105	55.56
					2*	1.465	0.859	?	?
3*	1.571	0.623	1.53105	55.5
					4*	1.860	0.567	?	?
5	∞	0.300	1.51680	64.2
					6	∞	0.430	?	?
Image planes	∞	0.000	?	?

Focal length 3.011

F value 4.0

[table 2]

Embodiment 1 (two lens)

The face number	K	A3	A4	A5	A6
						12	-8.10154480?-32.62857110	-0.048018660.20192561?	1.58637650?-0.04485772	-3.087871303.33250150?	2.99284350?-5.14303230

34

0.851301500.90619780

0.146887180.05780352

-0.46322196-0.09935381

0.18879620?-0.09135401

0.346433140.12084680

The face number	A7	A8	A9	A10	A11
						1234	3.85037010?-6.51213830-0.49611834-0.00513791	-9.073675406.39789450?0.12958528?-0.09143799	-4.1119767027.720699000.09606259?0.05916884?	-1.43599540?-16.16441900-0.03802918?-0.00734472?	17.791671002.65570010?-0.001060840.00001561?

The face number	A12	A13	A14	A15	A16
						1234	33.01863600?-19.58215700-0.00135727?-0.00035057?	16.33352800?-47.36203800-0.00125600?-0.00029207?	-80.22587700-41.18153600-0.00072505?-0.00015275?	-200.0026400048.33239800 0.00002502 ?-0.00003419	263.81876000133.186430000.00091066 0.00003222

[table 3]

Embodiment 1 F value 4.0/ focal length 3.011mm2 chip architecture

Shown in the below of the lens data of table 1, the focal distance f of imaging lens system 10A is 3.011mm, and the F value is 4.0.

In the lens data of table 1, the face number represent with near the lens face of object side be the 1st, along with towards the i that increases successively as side (i=1,2,3 ...) the face number.And table 1 also comprises and records aperture diaphragm Sat and optics GLa1, has also put down in writing the face number (i=5,6) of optics GLa1.

The Ri of table 1 represent i (i=1,2,3 ...) the paraxial radius of curvature of face, Di represent i (i=1,2,3 ...) on the optical axis Z of individual face and i+1 face face at interval.In addition, the symbol Ri of the Ri of table 1 and Figure 16 (i=1,2,3 ...) correspondence.

The Ndj of table 1 represent with near the optical considerations of object side be the 1st, along with towards the j that increases successively as side (j=1,2,3 ...) optical considerations to the refractive index of d line (wavelength 587.6nm), v dj representes the Abbe number of j optical considerations to the d line.In table 1, paraxial radius of curvature and face unit at interval is mm, and paraxial curvature radius nearby just is being made as for protruding situation at object side (thing side), in that as side to be that protruding situation is made as negative.

In the lens data of table 1, aspheric surface is at the additional * mark of face number.Each aspheric surface is defined by following aspheric surface formula.

[mathematical expression 1]

Z = \frac{Y^{2} / R}{1 + {(1 - K \cdot Y^{2} / R^{2})}^{1 / 2}} + Σ_{i = 3}^{20} {AiY}^{i}

Z: the aspheric surface degree of depth (point on the aspheric surface of height Y hangs down into the tangent length perpendicular to the vertical line on the plane of optical axis in aspheric surface summit)

Y: highly (from the distance of optical axis)

R: paraxial radius of curvature

K, Ai: asphericity coefficient (i=3～20)

Each aspheric each COEFFICIENT K, A3, A4, A5 in the table 2 expression aspheric surface formula ... Value.

Each the einzel lens La1～La2 that constitutes imaging lens system 10A all be light incident side and exiting side lens face both be aspherical shape simultaneously.

In addition, the relation of the maximum dimension D max of the effective coverage of the some picture in the camera system of embodiment shown in the table 31, pixel quantity (quantity of the pixel region) Ngs corresponding, the shortest photo distance Sk, depth of focus Sd with the maximum dimension D max of the effective coverage of putting picture.

In addition, with regard to the pixel quantity Ngs in the table 3, the quantity of the pixel region corresponding with the maximum gauge of the effective coverage of putting picture is shown by each pel spacing Pg (2.2 μ m, 1.85 μ m, 1.4 μ m) of the pixel region on the sensitive surface.Here, the value of pixel quantity Ngs is obtained according to the formula of pixel quantity Ngs=maximum dimension D max/ pel spacing Pg.

The maximum dimension D max of the effective coverage of above-mentioned some picture is the diameter that the effective coverage of this some picture comprises the effective coverage of the some picture on the direction of maximum pixels, and pixel pitch Pg is the pitch of the pixel region (light receiving pixel) on the above-mentioned direction.

The shortest photo distance Sk supplies the recommendation when the practicality with imaging lens system, and expression is from projecting to imaging lens system on the sensitive surface with the picture that the resolution of expectation will be taken the photograph body to the beeline of being taken the photograph body.This beeline by imaging lens system near the lens face (being lens face R1 here) of object side (thing side) to distance (photo distance) expression of being taken the photograph till the body.

This shortest photo distance is included in the scope of photo distance of the effect that obtains the quality through restore to handle improve taking the view data that the optical image that projects to sensitive surface obtains.

And in the camera system of embodiment 1, the scope of photo distance that obtains the effect of the quality through restore to handle improving view data is the scope of photo distance 0 to ∞ (infinity), is to take the gamut of being taken the photograph body.

Depth of focus Sd is illustrated in fixing being taken the photograph when under the state of body to the position of imaging lens system sensitive surface being defocused, and can project to the scope that defocuses on the sensitive surface with the picture that predetermined above resolution will be taken the photograph body.This depth of focus Sd is considered in the precalculated position fixedly under the state of sensitive surface with respect to the position of imaging lens system, in a way with can will be taken the photograph the corresponding value of scope that body projects to the photo distance on the sensitive surface with predetermined resolution.That is,, then be thought of as and taken the photograph the scope that body projects to the photo distance on the sensitive surface with predetermined resolution and also enlarge if the value of depth of focus Sd increases.

Can know according to table 3; The camera system of embodiment 1 constitutes: the effective coverage of the some picture on projecting to sensitive surface 21A is more than the 7 μ m and the pixel pitch that constitutes the light receiving pixel of sensitive surface 21A is 2.2 μ m when following, and the maximum gauge of the effective coverage of some picture is for relating to more than 3 pixels (3.2 pixel).

When in addition, the maximum dimension D max of the value of the shortest photo distance Sk in the effective coverage of the picture of setting up an office is 7 μ m 15f (approximately 45.2mm).

The maximum dimension D max of the value of the depth of focus Sd of imaging lens system 10A in the effective coverage of the picture of setting up an office is 250 μ m when being 7 μ m.

Value about the MTF characteristic relevant with the camera system of the foregoing description 1; Make sensitive surface 21A and imaging lens system 10A near the time; That is, the value of amount Ud is 0 o'clock in Figure 17 (a)～(d), and the value of all MTF characteristics of spatial frequency 20～50Line/mm is for just.

In addition, with sensitive surface 21A during away from imaging lens system 10A, that is, when the value of in Figure 17 (a)～(d), establishing amount was 250 μ m, the value of all MTF characteristics of spatial frequency 20～50Line/mm was for just.

That is, be in the scope of 0～250 μ m the time in the value of amount, spatial frequency in the value of all MTF characteristics of 20～50Line/mm for just.

In the value of amount when being 250 μ m to the scope of 400 μ m, spatial frequency in the value of the MTF of 20～50Line/mm characteristic from 0% counter-rotating and produce pseudo-the resolution.Represent to produce the pseudo-scope of differentiating with arrow G ik among the figure.

Here; With project to sensitive surface on quilt take the photograph the relevant MTF characteristic of the picture of body value greater than 0% o'clock; Take this view data that looks like to obtain and we can say and hold the information that optical significance is arranged, handle and can improve the data of the possibility of resolution so this view data becomes to have to implement to restore.But; With value that the quilt on projecting to sensitive surface is taken the photograph the relevant MTF characteristic of the picture of body is 0% or catadioptric when producing pseudo-the resolution from 0%; Take this view data that looks like to obtain and do not hold the information that optical significance is arranged; Therefore, even this view data is implemented to restore processing, can not improve the quality (resolution of the image of pictorial data representation) of view data.

According to the above-mentioned fact; If adopt this camera system; Under the predetermined state that fixedly position of sensitive surface 21A and imaging lens system 10A concerns; When making photo distance change to the scope of 15f～∞, can make is become all the time than 0% big value (can make it not produce pseudo-the resolution) taking the photograph MTF characteristic that body projects to the picture that forms on the sensitive surface 21A.

That is, in the scope of photo distance at 15f～∞, the picture that can make the quilt that projects on the sensitive surface 21A take the photograph body becomes significant picture.

And; When in the scope of 0～∞, changing photo distance; The effective coverage that projects to the some picture on this sensitive surface 21A becomes the above size of 3 pixels that relate on the sensitive surface 21A, so can be through the existing body of being taken the photograph of this scope is taken the view data that obtains and implemented to restore and handle the resolution that improves image.

That is, the camera system through embodiment 1 is taken the view data that obtains at the various pictures of being taken the photograph body of the scope of 15f～∞ and we can say and satisfy the precondition (improving the condition of resolution) that is used to implement to restore processing the photo distance that comprises that projects on the sensitive surface 21A.

And, suppress for less through the size change that will project to the some picture on the sensitive surface 21A, can carry out more easily to restore and handle.Promptly; For example; Even projecting to picture on the sensitive surface comprises and places the quilt of mutually different various photo distances to take the photograph body; If it is identical to constitute the fringe of some picture of each picture of being taken the photograph body, then place the quilt of any position to take the photograph the view data of body, also change parameter and carry out and restore processing not for expression.Thus, can alleviate the burden of the signal processing part of the computing of restoring processing.

On the other hand; Be treated under the situation of prerequisite to utilize identical parameter to carry out recovery all the time; If projecting to quilt that formation on the sensitive surface is positioned at mutually different various photo distances, to take the photograph the fringe of some picture of picture of body identical; Then through implement to restore handling, thereby also can its resolution of being taken the photograph the image of body of expression likewise be improved the view data that the quilt that expression is positioned at any position is taken the photograph body.That is,, can improve the resolution of image equably about integral image through restoring the enforcement of handling.

Like this; The design of the depth of focus through implement increasing imaging lens system 10A, thereby by the various pictures of being taken the photograph body that photo distance places the scope of 15f～∞ of comprising that project to through imaging lens system 10A on the sensitive surface 21A are taken the resolution of the integral image of the pictorial data representation that obtains and can be improved through restoring to handle.

In addition,, the light that incides sensitive surface 21A incidence angle can be reduced, that is, the good imaging lens system of telecentric iris property can be obtained with respect to this sensitive surface 21A according to the as above imaging lens system 10A of such design.

" about aberration " at the imaging lens system of embodiment 1 explanation

Figure 18 is the figure of the expression aberration relevant with imaging lens system 10A, in Figure 13 from be illustrated in each aberration diagram of the imaging lens system that embodiment 1 explains successively according to the order of spherical aberration (also claiming spherical aberration), astigmatism (also claiming astigmatism), distortion aberration (distortion aberration), multiplying power chromatic aberation.

It is the aberration of reference wavelength that each aberration diagram illustrates with e line (wavelength 546.07nm), but in spherical aberration diagram and multiplying power chromatic aberation figure, also representes the aberration about F line (wavelength 486.1nm), C line (wavelength 656.3nm).The distortion aberration desire to make money or profit that (parameter is handled, 0≤θ≤ω), establishing desirable image height is f * tan θ, expression and its departure with the focal distance f of whole system, angle of half field-of view θ.

" about the camera system of comparative example "

Below, be used for the existing imaging lens system of mobile phone as comparative example explanation with camera etc.

Figure 19 is the sectional view of the brief configuration of the related imaging lens system that is made up of 4 einzel lenses of expression comparative example; Figure 20 (a)～(d) representes on the coordinate of the amount Ud (μ m) of the optical axis direction (Z-direction) of sensitive surface, value (%) that the longitudinal axis is represented the MTF characteristic at transverse axis, and expression projects to the figure of variation of value (%) of MTF characteristic of the optical image of this sensitive surface when with respect to above-mentioned imaging lens system sensitive surface being defocused.Here, the de-focus region of sensitive surface is 400 μ m.

In addition, Figure 20 (a)～(d) of expression MTF characteristic is corresponding to Figure 17 (a)～(d) of the expression MTF characteristic relevant with imaging lens system 10A etc.

Shown in figure 19, the imaging lens system 10H of comparative example is that (arrow the figure-Z direction side) arranged the 1st einzel lens Lh1, the 2nd einzel lens Lh2, the 3rd einzel lens Lh3, the 4th einzel lens Lh4, and optics GLh1 and constituting successively respectively along optical axis C (Z axle) from object side.Having those 4 signal-lens imaging lens system 10H is designed to the depth of field and deepens.

The optical image that to be taken the photograph body through above-mentioned imaging lens system 10H projects on the sensitive surface 21H.

And optics GLh1 is the optics that does not have focal power that is made up of parallel flat.

In addition, in Figure 20 (a)～(d), to off-axis ray Jh5,5 light Jh1, Jh2, Jh3, Jh4, Jh5 are shown successively from the low side of image height with maximum field of view's angle incident from axle glazed thread Jh1.

And 5 MTF curve M th20 of record represent the variation of value of MTF characteristic of spatial frequency of 20/mm of the position of above-mentioned 5 ray casts to the sensitive surface 21H among Figure 20 (a).5 MTF curve M th30 of record represent the variation of value of MTF characteristic of spatial frequency of 30/mm of position same as described above among Figure 20 (b); 5 MTF curve M th40 of record also represent the variation of value of MTF characteristic of spatial frequency of 40/mm of position same as described above among Figure 20 (c), and 5 MTF curve M th50 of record also represent the variation of value of MTF characteristic of spatial frequency of 50/mm of position same as described above among Figure 20 (d).

The value of the MTF characteristic relevant with the camera system of above-mentioned comparative example; Make sensitive surface and imaging lens system near the time; Promptly; The value of amount relates to the approximately scope of from 0 to 120 μ m in Figure 20 (a)～(d), and (that is: the MTF characteristic of root/mm) becomes its value from 0% counter-rotating and produce the state of pseudo-resolution about spatial frequency 30～50Line/mm.Represent to produce the pseudo-scope of differentiating with arrow G ik among the figure.

In addition, during away from imaging lens system, that is, the value of amount relates to the scope of 280 μ m to 400 μ m in Figure 20 (a)～(d) with sensitive surface, becomes its value from 0% counter-rotating and produce the pseudo-state of differentiating about the MTF characteristic of spatial frequency 30～50Line/mm.Represent to produce the pseudo-scope of differentiating with arrow G ik among the figure.

Here; The value of amount Ud is between 120 μ m and 280 μ m when (scope of the depth of focus); The value of MTF characteristic is for just, and the amplitude of fluctuation of the value of the MTF characteristic of each spatial frequency becomes about 85% (50Line/mm), 90% (40Line/mm), 70% (30Line/mm), 45% (20Line/mm).

As stated, if adopt the camera system of comparative example, then only in narrow de-focus region (scopes of about 160 μ m), the value of MTF characteristic just becomes, and the variation of the value of MTF characteristic is big.

About the value of the MTF characteristic scope that defocuses (representing with arrow G ik the figure) from 0% counter-rotating, point similarly is the picture of being differentiated by puppet, can not get the effective coverage relate to more than 3 pixels can be specific the picture with optical significance.

That is, only in the scope of the photo distance that limits very much, the value of MTF characteristic is being for just, can be so that project to the significant picture of picture formation that quilt on the sensitive surface is taken the photograph body.In addition, it is bigger to project to the variation of size of the some picture on the sensitive surface.

In addition; The camera system of this comparative example is not that to constitute the effective coverage that when the scope of 0～∞ changes photo distance, projects to the some picture on the sensitive surface be the size more than 3 pixels that relate on this sensitive surface; Therefore, the view data that obtains through this camera system does not satisfy the precondition (improving the condition of resolution) that is used to implement to restore processing.

Thereby even take the photograph the picture of body and take the view data that obtains and implement to restore and handle projecting to quilt on the sensitive surface 21H through the camera system of comparative example, this quilt of expression that can not be improved is taken the photograph the effect of resolution of the image of body.

Figure 21 is the figure that the automobile of the mobile unit with camera system is carried in expression.

Shown in figure 21, the mobile unit 502～504 that possesses camera system of the present invention can be equipped on automobile 501 grades and use.The outer camera of car that the outer camera of car that this automobile 501 has the side dead range that is used to take the codriver's seat side is mobile unit 502, be used to take the rear side dead range of automobile 1 is mobile unit 503 and is installed in the back side of introscope and is used to take that camera is a mobile unit 504 in the car of the field range identical with the driver.

As shown in the figure, this mobile phone 510 disposes camera system 512 in the housing 511 of mobile phone.

Figure 23 is that the Medical Devices that expression has a camera system are the figure of endoscope apparatus.

As shown in the figure, this endoscope apparatus 520 of observing biological tissue 525 disposes the camera system 522 that is used for the biological tissue 525 that illumination light La for shooting illuminates at the leading section 521 of endoscope apparatus 520.

Like this, aforesaid camera head of the present invention with camera system, portable terminal device, mobile unit, and Medical Devices can with from known camera head of past, portable terminal device, mobile unit, and the existing camera system that possesses of Medical Devices easily change.Promptly; Do not change known so far camera head, portable terminal device, mobile unit, the plant bulk that reaches Medical Devices or shape etc.; The existing camera system that these devices have is replaced by camera system of the present invention, also can constitutes camera head, portable terminal device, mobile unit, and the Medical Devices of the application invention.

And; Example with various condition restriction imaging lens systems is shown in the above-described embodiments; Have the 1st set of lenses that constitutes by at least 1 lens successively and the lens of the 2nd set of lenses that constitutes by at least 1 lens but the imaging lens system that is used for camera system of the present invention is to use from the thing side, do not limit the lens number that constitutes each group or shape etc. with positive focal power with positive focal power.For example, also can use the multi-disc lens to constitute each group.

Claims

1. camera system is characterized in that having:

Imaging lens system;

Imaging apparatus has that two-dimentional shape is arranged a plurality of light receiving pixels and the sensitive surface that constitutes is taken the quilt that projects on the above-mentioned sensitive surface through above-mentioned imaging lens system and taken the photograph the optical image of body and the 1st view data that this quilt of output expression is taken the photograph body; And

Signal processing unit is implemented to generate and when the resolution of above-mentioned imaging lens system is high, is handled from the recovery of the 2nd equal view data of the 1st view data of above-mentioned imaging apparatus output above-mentioned the 1st view data;

Above-mentioned imaging lens system possesses the 1st set of lenses that comprises 1 lens at least and have positive focal power successively, and comprises 1 lens at least and have the 2nd set of lenses of positive focal power from the thing side;

Above-mentioned imaging lens system and imaging apparatus constitute: the optional position for from X, Y, Z direction projects to the some picture on the above-mentioned sensitive surface through above-mentioned imaging lens system; Also make the maximum gauge of effective coverage of this some picture become the above size of 3 pixels that relates to above-mentioned light receiving pixel

Above-mentioned signal processing unit use is carried out above-mentioned recovery with the corresponding recovery coefficient of state of the some picture of above-mentioned the 1st pictorial data representation and is handled.

2. camera system as claimed in claim 1; It is characterized in that; Above-mentioned imaging lens system constitutes: for projecting to the optical image that quilt on the above-mentioned sensitive surface is taken the photograph body from the optional position of the X more than 10 times of the focal length that leaves this imaging lens system, Y, Z direction through above-mentioned imaging lens system, make that also the value of the MTF characteristic relevant with this optical image just becomes.

3. according to claim 1 or claim 2 camera system; It is characterized in that above-mentioned signal processing unit will carry out above-mentioned recovery processing as least unit by reaching the pixel region that adds up to more than 9 pixels that relates to that constitutes more than horizontal 3 pixels more than vertical 3 pixels on the sensitive surface.

4. camera system is characterized in that having:

Imaging lens system;

Imaging apparatus has that two-dimentional shape is arranged a plurality of light receiving pixels and the sensitive surface that constitutes is taken the quilt that projects on the above-mentioned sensitive surface through above-mentioned imaging lens system and taken the photograph the optical image of body and the 1st view data that this quilt of output expression is taken the photograph body;

The coefficient storage unit; When the maximum gauge in the effective coverage that projects to the some picture on the above-mentioned sensitive surface through above-mentioned imaging lens system relates to big or small more than 3 pixels, to store by the corresponding recovery coefficient of state from the above-mentioned some picture of the 1st pictorial data representation of above-mentioned imaging apparatus output; And

Signal processing unit utilizes above-mentioned recovery coefficient above-mentioned the 1st view data to be implemented to generate and when the resolution of above-mentioned imaging lens system is high, handle from the recovery of the 2nd equal view data of the 1st view data of above-mentioned imaging apparatus output;

Above-mentioned signal processing unit will carry out above-mentioned recovery processing as least unit by reaching the pixel region that adds up to more than 9 pixels that relates to that constitutes more than horizontal 3 pixels more than vertical 3 pixels on the above-mentioned sensitive surface;

Above-mentioned imaging lens system has from the thing side successively: comprise 1 lens at least and have positive focal power the 1st set of lenses, and comprise 1 lens at least and have the 2nd set of lenses of positive focal power.

5. camera system as claimed in claim 4 is characterized in that,

The recovery coefficient that above-mentioned coefficient storage unit is obtained separately this camera system by each camera system storage.

6. camera system as claimed in claim 4 is characterized in that,

Above-mentioned coefficient storage unit storage from the candidate of each recovery coefficient corresponding with each state of the some picture that is divided into a plurality of kinds according to the selected recovery coefficient that goes out of the state of the some picture of above-mentioned the 1st pictorial data representation.

7. camera system as claimed in claim 4 is characterized in that,

Above-mentioned coefficient storage unit storage has further been carried out correction according to the selected recovery coefficient that goes out of the state of this some picture of above-mentioned the 1st pictorial data representation according to the state of a picture from the candidate of the multiple recovery coefficient corresponding with each state of this point picture that is divided into a plurality of kinds the recovery coefficient of having proofreaied and correct.

8. like each the described camera system in the claim 4 to 7, it is characterized in that also having the recovery coefficient of obtaining above-mentioned recovery coefficient and being stored in the above-mentioned coefficient storage unit and obtain the unit.

9. like each the described camera system in the claim 1,4 to 7, it is characterized in that,

Above-mentioned signal processing unit will comprise the minimum pixel zone of whole effective coverages of the some picture that projects on the above-mentioned sensitive surface and carry out above-mentioned recovery processing as least unit.

10. like each the described camera system in the claim 1,4 to 7, it is characterized in that,

Above-mentioned signal processing unit carries out above-mentioned recovery to be handled, and makes the size of effective coverage of the above-mentioned some picture in the image of above-mentioned the 2nd pictorial data representation less than the size of the effective coverage of the some picture in the image of above-mentioned the 1st pictorial data representation.

11. each the described camera system as in the claim 1,4 to 7 is characterized in that,

Above-mentioned imaging lens system is made up of 2 einzel lenses.

12. camera system as claimed in claim 11 is characterized in that,

The einzel lens of above-mentioned the 1st set of lenses is the meniscus shape of convex surface towards the thing side, and the einzel lens of above-mentioned the 2nd set of lenses is the meniscus shape of convex surface towards the thing side.

13. camera system as claimed in claim 11 is characterized in that,

The einzel lens of above-mentioned the 1st set of lenses, this signal-lens two sides is convex form; The einzel lens of above-mentioned the 2nd set of lenses is the meniscus shape of convex surface towards the picture side.

14. a camera head is characterized in that, possesses each the described camera system in the claim 1 to 13.

15. a portable terminal device is characterized in that, possesses each the described camera system in the claim 1 to 13.

16. a mobile unit is characterized in that, possesses each the described camera system in the claim 1 to 13.

17. Medical Devices is characterized in that, possess each the described camera system in the claim 1 to 13.

18. a camera system is characterized in that having:

Imaging lens system;

Imaging apparatus has that two-dimentional shape is arranged a plurality of light receiving pixels and the sensitive surface that constitutes, takes to project to quilt on the above-mentioned sensitive surface through above-mentioned imaging lens system and take the photograph the optical image of body and export the 1st view data that this quilt of expression is taken the photograph body;

The coefficient storage unit; When the maximum gauge in the effective coverage that projects to the some picture on the above-mentioned sensitive surface through above-mentioned imaging lens system relates to big or small more than 3 pixels, stored with by the corresponding recovery coefficient of state from the above-mentioned some picture of the 1st pictorial data representation of above-mentioned imaging apparatus output; And

Above-mentioned imaging lens system has from the thing side successively: comprise 1 lens at least and have the 1st set of lenses of positive focal power and comprise 1 lens at least and have the 2nd set of lenses of positive focal power.

19. the manufacturing approach of a camera system is characterized in that,

Be the manufacturing approach of the described camera system of claim 18,

To put picture through above-mentioned imaging lens system projects on the sensitive surface of above-mentioned imaging apparatus; Will be stored in above-mentioned coefficient storage unit by the corresponding recovery coefficient of state from the above-mentioned some picture of the 1st pictorial data representation of above-mentioned imaging apparatus output, make the camera system of storing recovery coefficient.

20. the manufacturing approach of camera system as claimed in claim 19 is characterized in that,

Above-mentioned recovery coefficient is obtained separately this camera system by each camera system.

21. the manufacturing approach of camera system as claimed in claim 19 is characterized in that,

Above-mentioned recovery coefficient is according to the selected recovery coefficient that goes out of the state of the some picture of above-mentioned the 1st pictorial data representation from the candidate of each recovery coefficient corresponding with each state of the some picture that is divided into a plurality of kinds.

22. the manufacturing approach of camera system as claimed in claim 19 is characterized in that,

Above-mentioned recovery coefficient is from the candidate of the multiple recovery coefficient corresponding with each state of this some picture that is divided into a plurality of kinds, further to have carried out the recovery coefficient of proofreading and correct according to the state of a picture according to the selected recovery coefficient that goes out of the state of the some picture of above-mentioned the 1st pictorial data representation.