JP2000004391A - Aberration correction quantity setting method, position adjusting device and image processor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To precisely obtain correction quantity for correcting the distortion of an image owing to the aberration of a lens by adjusting a relative position relation between a detection image and an image-pickup device, so that the detection image becomes vertical with respect to the optical axis of an image- pickup device. SOLUTION: A laser light beam ejecting device 106 is loaded on the installation position of a camera, and a laser beam is made incident on the mirror 102 of the image-pickup center position of a chart 100. Then, the direction of the chart 100 is adjusted so that the reflection angle becomes vertical, (i.e., light receiving positions in laser beam ejecting position and an ejecting face coincide). Then, the chart 100 is image-picked up by the camera provided with a lens whose aberration is unknown, and distortion owing to the aberration of the lens in the image projected through the lens is detected from image data obtained by image-pickup and reference image data showing the chart 100. A correction parameter for correcting image data is set so that distortion is dissolved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aberration correction amount setting method, a position adjusting device, and an image processing device, and more particularly, to image distortion caused by aberration of an image projected through a lens. Correction amount setting method for setting an aberration correction amount for solving the problem, a position adjustment device for adjusting the position of the imaging device with respect to the imaging surface, setting of the aberration correction amount, correction based on the aberration correction amount, and the like The present invention relates to an image processing device that performs image processing of (1).

[0002]

2. Description of the Related Art When a subject is imaged by a camera, an image of the subject is projected through a lens provided on the front of the camera (a surface facing the subject), and the projected image of the subject is photographed by a camera. It is common to record on film.

[0003] Since a lens used in such imaging has an aberration, an image of a subject projected through the lens has a deteriorated image quality due to the aberration of the lens.
In order to suppress the deterioration of the image quality, a technique has been proposed in which correction information for correcting the image quality deterioration caused by the aberration is obtained based on information on the aberration of the known lens, and correction is performed based on the obtained correction information. ing.

[0004] If the information on the aberration of the lens is known as described above, it is possible to correct the deterioration of the image quality caused by the aberration, but in fact, there are many lens manufacturers and various No information regarding lens aberrations is disclosed. Therefore, there is a need for a technique for obtaining information on aberration of a lens whose aberration is unknown and obtaining correction information for correcting image quality deterioration caused by the aberration.

[0005] Also, distortion is known as one of the lens aberrations. In order to obtain information on this distortion, a grid chart 100 as a test image shown in FIG. Image of the projected grid chart image, obtain a print of the grid chart image, and obtain information on the distortion of the target lens from the distortion of the grid chart appearing in the print. It is possible.

However, when the square chart 100 is not perpendicular to the optical axis P of the camera 34 as shown in FIG. 14 in the image of the square chart, the square which is supposed to be a square, regardless of the distortion of the lens 34A. The image of the eye chart is distorted in a trapezoidal shape as shown in FIGS.

In this case, it is impossible to determine whether the distortion of the grid chart appearing in the print is caused by lens distortion or a defect in the relative positional relationship between the grid chart and the camera. However, it is difficult to detect the distortion of the grid chart due to only the distortion of the lens. For this reason, it becomes difficult to accurately obtain information regarding the distortion of the lens, and to accurately obtain a correction amount for eliminating image distortion caused by the aberration.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and it is desirable to accurately obtain a correction amount for eliminating image distortion caused by lens aberration. A first object of the present invention is to provide a method for setting an aberration correction amount and an image processing apparatus capable of accurately setting a relative positional relationship between an image for verification and an imaging device so that the image for verification is perpendicular to the optical axis of the imaging device. A second object is to provide a position adjustment device that can be set well.

[0009]

According to a first aspect of the present invention, there is provided a method for setting an amount of aberration correction, comprising: a lens having an unknown aberration characteristic as a lens for projecting an object to be imaged. A mirror is arranged at a center position of imaging in a predetermined test image captured by a predetermined position, and a predetermined position of a mounting table for the imaging unit is set so that an optical axis is substantially aligned with a center position of imaging of the test image. Laser light is emitted from the laser light emitting means in a direction along the optical axis from the optical axis center position of the imaging means when the imaging means is mounted in a predetermined direction, and the laser light is emitted from the laser light emitting means. The reflected light is received by light receiving means provided on the optical path of the reflected light reflected by the mirror, and the light receiving position of the reflected light by the light receiving means and the optical axis of the laser light are relative to the mirror. A field that is vertical Based on the amount of deviation from the reference light receiving position, the relative positional relationship between the test image and the mounting table is adjusted so that the optical axis of the imaging unit is perpendicular to the test image, In place of the laser beam emitting unit, the imaging unit is placed at the predetermined position on the mounting table in the predetermined direction, and the image of the test image projected through the lens is captured by the imaging unit. Detecting, based on image data obtained by imaging, distortion of the image of the test image caused by aberration of the lens, and correcting the image data based on the detected distortion so as to eliminate the distortion. A correction amount is set.

In order to achieve the second object, a position adjusting device according to a second aspect of the present invention includes a mounting table for mounting an image pickup means, and a mirror provided at a center position of the image pickup on a surface to be imaged. The optical axis is shifted from the optical axis center position of the imaging unit when the imaging unit is mounted at a predetermined position on the mounting table in a predetermined direction such that the optical axis is aligned with the center position of the imaging of the imaging target surface. Laser light emitting means for emitting laser light in a direction along, a light receiving means provided on an optical path of reflected light emitted from the laser light emitting means and reflected by the mirror, and receiving the reflected light; The optical axis of the imaging means is set to the imaging surface based on the amount of deviation between the light receiving position of the reflected light by the light receiving means and a reference light receiving position when the optical axis of the laser light is perpendicular to the mirror. And the imaging surface so as to be perpendicular to And position adjusting means for adjusting the relative positional relationship between the mounting table and having a.

In order to achieve the first object, an image processing apparatus according to a third aspect of the present invention includes an image processing device comprising: an imaging unit arranged so that an optical axis is perpendicular to a predetermined test image;
Based on image data obtained by capturing an image of the test image projected through a lens whose aberration characteristic is unknown, distortion that detects distortion of the image of the test image due to aberration of the lens And a correction amount setting unit configured to set a correction amount for correcting the image data based on the distortion detected by the distortion detection unit so as to eliminate the distortion.

According to a fourth aspect of the present invention, in the image processing apparatus according to the third aspect, a correction means for correcting the image data based on the correction amount set by the correction amount setting means, Image output means for outputting an image based on the image data obtained by the correction by the correction means.

According to a fifth aspect of the present invention, there is provided the image processing apparatus according to the third or fourth aspect, wherein the information of the correction amount set by the correction amount setting means and the image obtained by the correction. The image processing apparatus further includes a disclosure unit that discloses an image after correction of the test image based on data.

In the aberration correction amount setting method according to the first aspect of the present invention, first, a mirror is placed at the center position of the imaging in the predetermined test image which is imaged by the imaging means (that is, the imaging target by the imaging means). Deploy. The imaging means includes a lens whose aberration characteristic is unknown, as a lens that projects the imaging target. Also, as the test image,
An image or the like in which a plurality of straight lines are drawn in a plurality of predetermined directions, such as a grid chart, can be adopted.

Next, when the imaging means is mounted in a predetermined direction at a predetermined position on a mounting table for the imaging means so that the optical axis is substantially aligned with the center position of the imaging of the test image. The laser light is emitted by the laser light emitting means in a direction along the optical axis from the center position of the optical axis. That is, the laser beam is applied in a direction along the optical axis from the optical axis center position in a state where the imaging unit is mounted on the mounting table so that the optical axis is aligned with the center position of the imaging of the test image (state at the time of imaging). Emitting means emits laser light. Thereby, the laser light emitted from the laser light emitting means reaches the mirror and is reflected by the mirror.

Next, the reflected light is received by the light receiving means provided on the optical path of the reflected light emitted from the laser light emitting means and reflected by the mirror, and the light receiving position of the reflected light by the light receiving means is determined. Based on the amount of deviation from the reference light receiving position when the optical axis is perpendicular to the mirror, the relative distance between the test image and the mounting table is set so that the optical axis of the imaging means is perpendicular to the test image. Adjustment is performed as follows.

That is, if the optical axis of the imaging means is perpendicular to the test image, the light receiving position coincides with the reference light receiving position,
These shift amounts are “0”. Therefore, the relative positional relationship between the test image and the mounting table is adjusted in the direction in which the shift amount decreases, and the adjustment ends when the shift amount becomes “0”. At this time, it can be considered that the optical axis of the imaging means is perpendicular to the test image.

The light receiving means can be constituted by, for example, a half mirror provided on the optical path of the reflected light, and an area CCD sensor provided in the direction of light reflection by the half mirror.

After adjusting the relative positional relationship between the test image and the mounting table in this way, the imaging means is mounted in a predetermined direction on the mounting table in a predetermined direction instead of the laser beam emitting means. Here, the mirror may be removed from the verification image. Of course, if the mirror size is small, there is no need to remove it.

Since the imaging means is mounted on the mounting table in a predetermined direction in a predetermined direction, similarly to the laser beam emitting means, the relative positional relationship between the verification image and the mounting table is adjusted. Accordingly, the optical axis of the imaging means at this time becomes perpendicular to the test image.

In this state, the image of the test image projected through the lens is picked up by the image pickup means. At this time, since the optical axis of the imaging unit is perpendicular to the verification image as described above, the projected image of the verification image includes the optical axis of the imaging unit that is not perpendicular to the verification image. Image distortion is not included, but image distortion due to lens aberration appears.

It is to be noted that the "image distortion" here is not caused by the image distortion caused by the lens distortion, but is caused not only by the distortion but also by the entire aberration of the lens including the spherical aberration and the chromatic aberration of magnification. It means image distortion. The same applies to “image distortion” below. Therefore, based on image data obtained by imaging, distortion of the image of the test image due to aberration of the lens is detected. For example, image data obtained by imaging and image data of a predetermined test image are developed in the same two-dimensional coordinate system by image processing, and deviations, distortions, and the like between the images developed in the two-dimensional coordinate system are obtained. Accordingly, it is possible to detect the distortion of the image of the test image due to the aberration of the lens.

Then, a correction amount for correcting the image data is set based on the detected distortion so as to eliminate the distortion, that is, so that the image represented by the image data is distorted in the direction opposite to the direction of the distortion.

As described above, after adjusting the relative positional relationship between the test image and the mounting table so that the optical axis of the imaging means is perpendicular to the test image, the aberration is determined via the lens whose aberration is unknown. Since the projected image of the test image is captured, the image of the test image in which the optical axis of the imaging unit is not perpendicular to the test image does not include the distortion and the distortion caused by the lens aberration appears. Will be imaged. Then, based on the image data obtained by capturing the image of the test image,
Since the distortion of the image of the test image caused by the lens aberration is detected, and the correction amount is set based on the detected distortion so as to eliminate the distortion, the optical axis of the imaging unit is not perpendicular to the test image. In addition, the correction amount for eliminating the image distortion caused by the lens aberration can be set with high accuracy after eliminating the distortion caused by the above.

According to a second aspect of the present invention, there is provided the position adjusting device, wherein the imaging means is mounted in a predetermined direction on the mounting table in a predetermined direction such that the optical axis is aligned with the center position of the imaging on the imaging surface. Laser light is emitted by the laser light emitting means in a direction along the optical axis from the optical axis center position of the means. That is, the laser beam is directed from the center of the optical axis in the direction along the optical axis when the imaging unit is mounted on the mounting table so that the optical axis is aligned with the center position of the imaging of the imaging target surface (state at the time of imaging). Emitting means emits laser light. Thereby, the laser light emitted from the laser light emitting means reaches a mirror provided at the center position of the imaging on the imaging surface, and is reflected by the mirror.

The light reflected by the mirror is received by light receiving means provided on the optical path of the reflected light. At this time, if the optical axis of the imaging means is perpendicular to the imaging surface, the light receiving position of the light receiving means coincides with the reference light receiving position when the optical axis of the laser light is perpendicular to the mirror. The shift amount is “0”. The light receiving means includes, for example, a half mirror provided on the optical path of the reflected light, and an area CC provided in the light reflection direction of the half mirror.
And a D sensor.

The position adjusting device is mounted on the imaging surface such that the optical axis of the imaging device is perpendicular to the imaging surface based on the amount of deviation between the light receiving position of the light receiving device and the reference light receiving position. Position adjusting means for adjusting the relative positional relationship with the table is provided. The position adjusting means may be configured so that a human can adjust the relative positional relationship between the imaging surface and the mounting table, or may automatically adjust the relative positional relationship between the imaging surface and the mounting table. It may be adjusted.

Here, the optical axis of the imaging means should be perpendicular to the surface to be imaged, that is, the amount of displacement should be "0".
The relative positional relationship between the imaging surface and the mounting table is adjusted by the position adjusting means in the direction in which the shift amount decreases, and the adjustment ends when the shift amount becomes “0”. At this time, the optical axis of the imaging means is perpendicular to the imaging surface. As described above, the adjustment can be easily performed so that the optical axis of the imaging unit is perpendicular to the surface to be imaged.

In the position adjusting apparatus according to the second aspect, the surface to be imaged is used as the inspection image, so that the relative position between the inspection image and the mounting table in the aberration correction amount setting method according to the first aspect. It can be applied as a means for adjusting the relationship.

[0030] In the image processing apparatus according to the third aspect of the present invention, the image pickup means arranged so that the optical axis is perpendicular to the predetermined test image is projected through a lens whose aberration characteristic is unknown. An image of the image is captured. At this time, since the optical axis of the imaging unit is perpendicular to the verification image, the projected image of the verification image includes image distortion due to the optical axis of the imaging unit not being perpendicular to the verification image. Is not included, and image distortion due to lens aberration appears.

Therefore, the distortion detecting means detects the distortion of the image of the test image due to the aberration of the lens based on the image data obtained by the imaging. Similarly to the above, for example, image data obtained by imaging and image data of a predetermined test image are developed in the same two-dimensional coordinate system by image processing, and the images developed in the two-dimensional coordinate system are combined. From the deviation, distortion, and the like, the distortion of the image of the test image due to the lens aberration can be detected.

The correction amount setting means corrects the image data so as to eliminate the distortion based on the detected distortion, that is, so that the image represented by the image data is distorted in the direction opposite to the direction of the distortion. Set the correction amount.

In this way, after eliminating the distortion caused by the optical axis of the imaging means not being perpendicular to the test image, the amount of correction for eliminating the image distortion caused by the lens aberration can be accurately determined. Can be set well.

In the image processing apparatus according to the fourth aspect, the correction means corrects the image data based on the correction amount set by the correction amount setting means, and the image output means based on the image data obtained by the correction. Output an image. As the output here, the image output means may display the image on a display or print the image on recording paper.

The correction amount (that is, the correction amount for eliminating the image distortion caused by the lens aberration) is obtained after eliminating the distortion caused by the optical axis of the imaging means not being perpendicular to the test image. Since the setting is made with high accuracy, the image data representing the image in which the image distortion due to the lens aberration has been eliminated can be obtained by the correction by the correction means based on the correction amount. Thus, the image output unit outputs an image in which the image distortion due to the lens aberration has been eliminated.

In the image processing apparatus according to the fifth aspect, the disclosure means discloses the corrected image of the test image based on the information of the set correction amount and the image data obtained by the correction. Specifically, the information of the correction amount and the corrected image of the test image may be disclosed on the Internet via a communication line, or may be disclosed to a predetermined information provider via the communication line. .

[0037]

Embodiments of the present invention will be described below with reference to the drawings.

(Schematic Configuration of Digital Laboratory System) FIGS. 1 and 2 show a schematic configuration of a digital laboratory system 10 according to the present embodiment.

As shown in FIG. 1, the digital lab system 10 includes a line CCD scanner 14, an image processing unit 16, a laser printer unit 18, and a processor unit 20. The processing unit 16 is integrated as the input unit 26 shown in FIG.
Are integrated as an output unit 28 shown in FIG.

The line CCD scanner 14 is for reading a frame image recorded on a photographic film such as a negative film or a reversal film.
5 size photographic film, 110 size photographic film, and photographic film with a transparent magnetic layer (24
0 size photographic film: so-called APS film), 12
Frame images of photographic film of size 0 and size 220 (Brownie size) can be read. In the line CCD scanner 14, the light emitted from the light source 66 is diffused by the light diffusion plate 72 and is applied to the frame image of the photographic film 68 on the film carrier 74. The light transmitted through the frame image enters the lens unit 76,
The lens unit 76 forms an image of the transmitted light on the light receiving surface of the line CCD 30. The frame image formed here is read by the line CCD 30, and the image data obtained by this reading is A / D converted by the A / D converter 32.
After the conversion, it is output to the image processing unit 16.

The image processing section 16 stores image data (scanned image data) output from the line CCD scanner 14.
Is input, and image data obtained by imaging with the digital camera 34 or the like, a document (for example, a reflection document, etc.)
Data obtained by reading the image data with a scanner 36 (flat bed type), image data generated by another computer and recorded in a floppy disk drive 38, MO drive or CD drive 40, and received via a modem 42 The communication image data and the like (hereinafter, these are collectively referred to as file image data) can be externally input. Further, the image processing section 16 is configured so that an output signal from an area CCD sensor 90 described later can be input.

The image processing section 16 stores the input image data in a storage section 44 composed of a non-volatile storage device (for example, a hard disk device).
6. The image processing such as various corrections is performed by the hypertone processing section 48, the hyper sharpness processing section 50, and the like, and the image data subjected to the image processing is output to the laser printer section 18 as recording image data. The image processing unit 16
Means that image data subjected to image processing is output to an external device as an image file (for example, output to a storage medium such as an FD, MO, CD, or transmitted to another information processing device via a communication line). It is also possible.

The laser printer section 18 includes R, G, and B laser light sources 52, and controls a laser driver 54 to record image data (temporarily stored in an image memory 56) input from the image processing section 16. Is applied to the photographic printing paper, and scanning exposure (in the present embodiment, mainly the polygon mirror 58 and the fθ lens 60) is performed.
An image is recorded on the photographic paper 62 by an optical system using the same. Further, the processor unit 20 includes a laser printer unit 18.
The photographic paper 62 on which an image has been recorded by scanning exposure is subjected to color development, bleach-fixing, washing, and drying.
Thus, an image is formed on the printing paper.

(Configuration of Image Processing Unit) Next, the configuration of the image processing unit 16 will be described with reference to FIG. As shown in FIG.
The image processing unit 16 stores the input image data (scanned image data, image data obtained by imaging with the digital camera 34, and the like), and stores the grid chart 10
Storage unit 44 in which image data representing 0 (FIG. 5) is stored in advance.
And image processing for generating output image data by performing image processing on input image data, including the above-described color gradation processing unit 46, hypertone processing unit 48, and hypersharpness processing unit 50. Based on the execution unit 84, image data representing the grid chart 100, and image data obtained by imaging the grid chart 100, distortion of an image projected through a lens during imaging (caused by lens aberrations) Distortion detection unit 80 for detecting the distortion of an image
And a correction parameter setting unit 82 for setting a correction parameter for correcting image data based on the distortion of the image detected by the distortion detection unit 80 so as to eliminate the distortion.
And an area CCD used when adjusting an imaging position to be described later.
Based on an output signal from the sensor 90, a shift amount between a laser beam emitting position and a light receiving position, which will be described later, is detected. If the shift amount exceeds a predetermined allowable value, the light receiving position shift state shown in FIG. Is displayed on the monitor 16M.

The image processing execution unit 84 further includes an aberration correction unit 84A that corrects image data using the correction parameters set by the correction parameter setting unit 82. The image corrected by the aberration correction unit 84A The data is output from the image processing unit 16 as image data for output. Further, the image processing unit 16 discloses the correction parameters set by the correction parameter setting unit 82 and the image represented by the image data corrected based on the correction parameters to the outside via the modem 42 and the communication line 92 via the Internet. It is configured to be able to.

(Structure of Various Members for Position Adjustment) In this embodiment, although the detailed procedure will be described later, the optical axis of a camera provided with a lens whose aberration is unknown is set to be perpendicular to the imaging surface. After adjusting the relative position between the camera and the image-capturing surface, the camera captures an image of the image-capturing surface, and removes distortion caused by lens aberration in an image (imaged image) projected through the lens. A correction parameter for detecting and correcting image data (image data obtained by capturing an image) so as to eliminate distortion of the detected image is set.

Here, the structure of various members for position adjustment used when adjusting the relative position between the camera and the imaging surface will be described below.

The position adjustment is performed as shown in FIG.
A mirror 102 is attached near the center position of the grid chart 100 attached at 0 (see also FIG. 6), and a mounting table 104 for mounting a camera is placed at the same position as the camera in the same direction as FIG. This is performed in a state where the laser light emitting device 106 is mounted. Further, as shown in FIG. 8B, a half mirror 91 is provided on the optical path of the laser light emitted from the laser light emitting device 106 so that the inclination angle with respect to the laser light is 45 degrees. By 91
The reflected light from the mirror 102 is reflected upward in FIG. 8B and received by the area CCD sensor 90. The area CCD sensor 90 is connected to the image processing unit 16 (FIG. 3) via a cable (not shown),
The output signal from 0 can be input to the shift amount detection unit 86.

When the optical axis of the laser beam from the laser beam emitting device 106 is perpendicular to the mirror 102, the position where the reflected light from the mirror 102 is received by the area CCD sensor 90 (reference light receiving position) is Is required in advance,
The information on the reference light receiving position is held by the shift amount detection unit 86.

FIGS. 7A to 7C show one of the mounting tables 104.
Two configuration examples are shown. As shown in FIG. 7A, the mounting table 1
Reference numeral 04 denotes a chair type, which is an inverted L-shape when projected from the direction of arrow B as shown in FIG.
4A, leg 10 supporting camera support 104A from below
4B and a bottom surface portion 104C. In addition,
7B and 7C, the digital camera 34 is mounted on the mounting table 1.
The position of the digital camera 34 when placed on the camera 04 is indicated by a broken line. The leg 104B and the bottom 104
C may be constituted by a tripod mount, for example.

FIGS. 9A to 9C show a board 110 and one of adjusting mechanisms for adjusting the orientation of the board 110.
Two configuration examples are shown. As shown in these figures,
A shaft 112 is inserted into the board 110 in the direction of arrow F from the side of the board 110.
Is held by a shaft holding portion 114 provided in the vicinity of the side surface. The shaft holding portion 114 has a leg portion 116 and a bottom portion 118.
Is held by The bottom portion 118 rides on the disk portion 120, and a cylindrical shaft 122 fixed to the center of the disk portion 120 is inserted into a circular hole 118 </ b> A provided in the center of the bottom portion 118. . With the above-described structure, the board 110 is mounted on the shaft 112 as shown in FIG.
9 can be rotated in the direction of arrow G about
As shown in (C), it is rotatable about the shaft 122 in the direction of arrow H.

(Operation of the present embodiment) Next, as an operation of the present embodiment, the camera and the imaging surface are set so that the optical axis of the camera having the lens whose aberration is unknown is perpendicular to the imaging surface. Position adjustment processing for adjusting the relative position of (FIG. 10)
And an aberration correction process (FIG. 11) for setting a correction parameter for correcting image distortion due to lens aberration and performing correction with the correction parameter. FIG.
0, the processing routine shown in FIG. 11 is described including the processing performed by the operator in order to easily explain the flow of each processing.

First, the position adjustment processing will be described with reference to the flowchart of FIG. In step 202 of FIG. 10, the operator places the grid chart 100 at a predetermined position (the position indicated by the broken line E in FIG. 9A) on the board 110 as shown in FIG.
And a mirror 102 is attached to the center of the grid chart 100 (see FIG. 6, which corresponds to the center position of the camera).

In the next step 204, the operator places the laser beam emitting device 106 having the area CCD sensor 90 on the emitting surface on the mounting table 104. At this time, a camera (a digital camera 34 as an example in the present embodiment)
It is assumed that the laser beam emitting device 106 is mounted on the mounting table 104 at the same position and in the same direction as when the laser beam is mounted on the mounting table 104. As a result, the mirror 102 is located on an extension of the direction in which the laser light is emitted from the laser light emitting device 106. Also, in this step 204, FIG.
As shown in (B), a half mirror 91 is provided on the optical path of the laser light of the laser light emitting device 106 so that the inclination angle with respect to the laser light is 45 degrees.

In the next step 206, the laser beam is emitted from the laser beam emitting device 106. Laser light is mirror 1
02 and is reflected by this mirror 102. Then, after the reflected light is reflected by the half mirror 91, it reaches the area CCD sensor 90. Next step 208
Then, the reflected light is received by the area CCD sensor 90. The output signal from this area CCD sensor 90 is shown in FIG.
Is input to the deviation amount detection unit 86.

In the next step 210, the deviation amount detecting section 86
Based on the output signal from the area CCD sensor 90, the shift amount of the light receiving position of the reflected light from the above-described reference light receiving position is detected. In the next step 212, the detected shift amount is set to a predetermined allowable value of the shift. Is determined.

If the direction of incidence of the laser beam on the mirror 102 is perpendicular to the mirror 102, the light receiving position of the reflected light coincides with the reference light receiving position, and the shift amount is "0". As the incident direction of the laser beam is gradually tilted from the state perpendicular to the mirror 102, the shift amount increases.

That is, in the above step 212, if the deviation does not exceed the allowable value, it is determined that the incident direction of the laser beam is almost perpendicular to the mirror 102, and if the deviation exceeds the allowable value, Laser beam incident direction is mirror 10
It can be determined that it is greatly inclined beyond the allowable range from a state perpendicular to 2.

For this reason, if the detected shift amount exceeds the allowable shift value, the process proceeds to step 214, where the shift amount detection unit 86 determines the shift state of the light receiving position R from the reference light receiving position Q shown in FIG. Is displayed on the monitor 16M.

The operator looks at the diagram showing the state of the shift, and in the next step 216, sets the shift amount to be small.
The direction of the board 110 to which the mirror 102 is attached is adjusted. For example, as shown in FIG. 9B, the board 110 is rotated about the axis 112 in the direction of arrow G, or as shown in FIG.
0 is rotated in the direction of arrow H. After the adjustment, the process returns to step 206, and the deviation of the light receiving position of the reflected light from the reference light receiving position is detected again in the state after the adjustment (step 21).
0), it is determined whether or not the detected shift amount exceeds a predetermined shift allowable value (step 212).

On the other hand, if the deviation amount does not exceed the allowable value in step 212, the process proceeds to step 218, where a message indicating that the position adjustment is completed is displayed on the monitor 16M. At this point, the incident direction of the laser beam is
The position of the laser beam emitting device 106 and the square chart 1
The position relative to 00 is adjusted.

At the next step 220, the operator who saw the message displayed on the monitor 16M removes the mirror 102 and the half mirror 91 on the optical path, which were pasted at the center of the grid chart 100, and emitted the laser beam. The device 106 is removed from the mounting table 104. Then, in the next step 222, the operator mounts the digital camera 34 provided with a lens 34A whose aberration is unknown (a lens whose aberration is to be obtained) at a predetermined position on the mounting table 104 as shown in FIG. Place.

Thus, the position adjustment processing is completed. At this time, the optical axis P of the digital camera 34 is
The relative positional relationship between the position of the digital camera 34 and the grid chart 100 has been adjusted so as to be perpendicular to 0.

That is, the position of the digital camera 34 and the grid chart 100 are adjusted so that the optical axis P of the digital camera 34 is perpendicular to the grid chart 100 by using the position adjusting member by the processing of FIG. Can be easily and accurately adjusted.

Next, the aberration correction processing will be described with reference to the flowchart of FIG. In step 252 of FIG. 11, the digital camera 34 captures an image of the grid chart 100 in a state where the above-described position adjustment is completed. Thus, the image of the grid chart 100 projected via the lens 34A is captured, and the image data obtained by the imaging is stored in the memory built in the digital camera 34. At this time, since the optical axis of the digital camera 34 is perpendicular to the grid chart 100, the distortion of the image of the grid chart 100 is caused by the optical axis of the digital camera 34 not being perpendicular to the grid chart 100. (See FIGS. 15 and 16) do not occur.

In the next step 254, the digital camera 34 and the image processing section 16 are connected by a communication cable (not shown), and image data representing the image of the grid chart 100 obtained by the above-described imaging (hereinafter referred to as the captured image data and ) Is input from the digital camera 34 to the storage unit 44. And
The distortion detection unit 80 fetches the captured image data from the storage unit 44.

The distortion detecting section 80 stores reference image data (hereinafter referred to as reference image data) representing the grid chart 100 stored in advance in the next step 256 in the storage section 44.
In the next step 258, the captured image data and the reference image data are developed in the same virtual two-dimensional coordinate system, and a shift between the two developed images is obtained. The distortion of the image of the chart 100 (the image projected through the lens) is detected.

In the next step 260, the correction parameter setting section 82 corrects the distortion detected by the distortion detecting section 80, that is, the captured image is distorted in the direction opposite to the direction of the distortion. Correct the data,
Parameters for the correction are set.

Although omitted in FIG. 11, the image processing execution unit 84
Is color gradation processing, hypertone processing,
Image processing such as various corrections such as hyper sharpness processing is executed. Then, in the next step 262, the aberration corrector 84A performs image processing for aberration correction on the captured image data on which the image processing has been performed, using the set correction parameters.

In the next step 264, the image data subjected to image processing for aberration correction is
Output to As a result, a photographic print in which the image represented by the image data after the aberration correction based on the set correction parameters is created from the laser printer unit 18.

In the next step 266, the modem 42 and the communication line 92 combine the correction parameters set by the correction parameter setting unit 82 with the image represented by the image data after the aberration correction based on the correction parameters. Open to the outside via the Internet via. Then, the processing in FIG. 11 ends. By the processing of FIG. 11 described above, the optical axis of the digital camera 34 is
After the position is accurately adjusted so as to be perpendicular to 0, the image of the grid chart 100 projected through the lens 34A whose aberration is unknown is captured, so that the optical axis is not perpendicular to the grid chart 100. Accordingly, captured image data of an image that does not include distortion due to the above and includes distortion due to the aberration of the lens 34A is obtained. Based on the captured image data, the grid chart 10 due to the aberration of the lens 34A
Since the distortion of the image 0 is detected and a correction parameter for eliminating the distortion is set based on the detected distortion, distortion due to the optical axis not being perpendicular to the grid chart 100 is eliminated. Above, it is possible to accurately set the correction parameter for eliminating the image distortion caused by the aberration of the lens 34A.

Further, since the set high-precision correction parameters and the image represented by the image data after the aberration correction based on the correction parameters are combined and disclosed to the outside via the Internet, anyone can obtain the correction parameters and the image information. It can be easily obtained. It is more preferable that the image data before aberration correction is also disclosed. However, as for this disclosure, it is preferable that only a system that has been approved by the manufacturer of the lens is released.

In the above-described embodiment, an example is described in which the camera provided with a lens whose aberration is unknown is a digital camera. However, the present invention is not limited to a digital camera. When the camera having the lens whose aberration is unknown is a normal camera with a built-in film, the position is adjusted so that the optical axis of the camera is perpendicular to the grid chart 100 by the processing of FIG. Grid chart 10 with camera
0, the image projected through the lens is recorded on a film, and the image recorded on the film is recorded on a line CC.
By reading with the D scanner 14, image data representing the image of the grid chart 100 projected through the lens can be obtained. Thereafter, the same processing as described above may be performed using this image data as captured image data.

When the size of the mirror 102 attached to the center of the grid chart 100 is sufficiently small, the processing of FIG. 11 may be executed with the mirror 102 attached. That is, the mirror 102 in step 220 of FIG.
Can be omitted.

The test image is not limited to the grid chart as shown in FIG. 5, but may be any image in which a plurality of straight lines are drawn at predetermined intervals in a plurality of predetermined directions. be able to.

Further, the above embodiment is characterized in that a jig for adjusting the position of the inspection image and the optical axis of the camera so as to be perpendicular to each other is provided. The method with the highest accuracy for guaranteeing the perpendicularity is the method using the laser beam described above, but another method may be used. For example, yarns having the same length may be stretched from four points on a plane perpendicular to the installation surface of the camera, and a verification image may be set at the end of each yarn. This method is less accurate than the method using laser light, but can be easily executed at low cost.

[0077]

As described above, according to the first aspect of the present invention, the relative positional relationship between the test image and the mounting table is set so that the optical axis of the imaging means is perpendicular to the test image. After the adjustment, an image of the test image projected through a lens whose aberration is unknown is captured, and distortion of the image of the test image caused by the lens aberration is detected based on the image data obtained by the imaging. Then, since the correction amount is set based on the detected distortion to eliminate the distortion, after eliminating the distortion due to the optical axis of the imaging unit not being perpendicular to the test image,
The correction amount for eliminating the image distortion caused by the lens aberration can be set with high accuracy.

According to the second aspect of the present invention, it is possible to easily adjust the optical axis of the image pickup means so as to be perpendicular to the surface to be imaged.

According to the third aspect of the present invention, after eliminating the distortion caused by the optical axis of the imaging means not being perpendicular to the test image, the distortion of the image caused by the lens aberration is eliminated. Correction amount can be set with high accuracy.

According to the fourth aspect of the present invention, it is possible to obtain image data representing an image in which the image distortion caused by the lens aberration is eliminated, and from the image output means, it is possible to obtain the image data caused by the lens aberration. An image in which the distortion of the image is eliminated is output.

According to the fifth aspect of the present invention, it is possible to disclose the correction amount information and the corrected image of the test image.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a digital laboratory system according to an embodiment of the present invention.

FIG. 2 is an external view of a digital laboratory system.

FIG. 3 is a block diagram illustrating a configuration of an image processing unit.

FIG. 4 is a diagram showing an arrangement of members when executing a position adjustment process.

FIG. 5 is a diagram showing an example of a grid chart.

FIG. 6 is a diagram showing the arrangement of mirrors on a grid chart;

7A is a perspective view showing a configuration example of a mounting table, FIG. 7B is a projection view from the direction of arrow B in FIG.
(C) is a projection view from the arrow C direction of (A).

FIG. 8A is a perspective view showing a configuration example of a laser light emitting device and an area CCD sensor, and FIG. 8B is a view showing an arrangement of a half mirror.

FIG. 9A is a front view showing a configuration example of a board and an adjustment mechanism for adjusting the orientation of the board;
(B) is a side view of (A), (C) is a plan view of (A).

FIG. 10 is a flowchart illustrating a processing routine of a position adjustment process.

FIG. 11 is a flowchart showing a processing routine of aberration correction processing.

FIG. 12 is a diagram illustrating an arrangement of members when performing an aberration correction process.

FIG. 13 is a diagram illustrating a display example of a state of displacement of a light receiving position.

FIG. 14 is a diagram showing a case where the optical axis of the camera is not perpendicular to the grid chart.

FIG. 15 is a diagram showing an image in which there is no distortion due to lens distortion and the distortion appears because the optical axis of the camera is not perpendicular to the grid chart.

FIG. 16 is a diagram showing an image in which both a pincushion type distortion caused by lens distortion and a distortion caused by the optical axis of the camera not being perpendicular to the grid chart appear.

[Explanation of symbols]

 Reference Signs List 10 digital laboratory system 16 image processing unit 34 digital camera 34A lens 80 distortion detection unit 82 correction parameter setting unit 84A aberration correction unit 86 shift amount detection unit 90 area CCD sensor 100 grid chart 102 mirror 104 mounting table 106 laser light emitting device 110 board

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5C022 AA00 AB43 AB51 AC26 AC42 AC51 AC54 AC77 AC78 5C061 BB03 BB11 5C062 AB00 AB05 AB17 AB42 AC24 AC58 BA00 5C076 AA40 BA01 BA03 BA04 BA05 BA06 5C077 LL02 MM27 SS01 SS03

Claims (5)

[Claims] 1. A mirror is arranged at a center position of imaging in a predetermined test image picked up by an image pickup means having a lens whose aberration characteristic is unknown as a lens for projecting an image pickup object, The optical axis is shifted from the optical axis center position of the imaging unit when the imaging unit is mounted in a predetermined direction at a predetermined position of the mounting table for the imaging unit so that the optical axis substantially matches the center position of the imaging. In the direction along, laser light is emitted by laser light emitting means, and the reflected light is received by light receiving means provided on an optical path of reflected light emitted from the laser light emitting means and reflected by the mirror, The optical axis of the imaging unit is used for the test based on the amount of deviation between the light receiving position of the reflected light by the light receiving unit and a reference light receiving position when the optical axis of the laser light is perpendicular to the mirror. Hanging on the image The relative positional relationship between the test image and the mounting table is adjusted so as to be straight, and the imaging unit is mounted in the predetermined direction at the predetermined position on the mounting table instead of the laser light emitting unit. The image of the test image projected through the lens is taken by the imaging means, and the image of the test image caused by aberration of the lens is distorted based on image data obtained by the imaging. An aberration correction amount setting method for, based on the detected distortion, setting a correction amount for correcting the image data so as to eliminate the distortion. 2. A mounting table for mounting an imaging unit, a mirror provided at a center position of imaging on a surface to be imaged, and a mirror so that an optical axis is aligned with a center position of imaging on the surface to be imaged. A laser light emitting unit that emits a laser beam in a direction along an optical axis from an optical axis center position of the imaging unit when the imaging unit is mounted at a predetermined position on the mounting table in a predetermined direction; A light receiving unit provided on an optical path of the reflected light emitted from the emitting unit and reflected by the mirror, for receiving the reflected light; a light receiving position of the reflected light by the light receiving unit; and an optical axis of the laser light, The relative position between the imaging surface and the mounting table so that the optical axis of the imaging unit is perpendicular to the imaging surface, based on the amount of deviation from the reference light receiving position when perpendicular to the mirror. Adjustment means for adjusting a complicated positional relationship The position adjusting device having a. 3. An image of the test image projected through a lens whose aberration characteristic is unknown by an image pickup means arranged so that an optical axis is perpendicular to a predetermined test image. Based on the image data obtained in step (a), detecting distortion of the image of the test image due to aberration of the lens; and distorting the distortion based on the distortion detected by the distortion detector. And a correction amount setting unit configured to set a correction amount for correcting the image data. 4. A correction unit for correcting the image data based on the correction amount set by the correction amount setting unit, and an image output unit for outputting an image based on the image data obtained by the correction by the correction unit. The image processing apparatus according to claim 3, further comprising: 5. A disclosing means for disclosing a corrected image of the test image based on the information on the correction amount set by the correction amount setting means and image data obtained by the correction. Item 5. The image processing device according to Item 4.