CN112215777B - Calibration system, calibration method, calibration device and electronic equipment of point spread function - Google Patents
Calibration system, calibration method, calibration device and electronic equipment of point spread function Download PDFInfo
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- CN112215777B CN112215777B CN202011127875.XA CN202011127875A CN112215777B CN 112215777 B CN112215777 B CN 112215777B CN 202011127875 A CN202011127875 A CN 202011127875A CN 112215777 B CN112215777 B CN 112215777B
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- 238000000034 method Methods 0.000 title claims abstract description 49
- 230000006870 function Effects 0.000 claims abstract description 127
- 239000013307 optical fiber Substances 0.000 claims description 26
- 238000003384 imaging method Methods 0.000 claims description 14
- 238000012935 Averaging Methods 0.000 claims description 10
- 238000004364 calculation method Methods 0.000 claims description 5
- 238000011084 recovery Methods 0.000 abstract description 13
- 230000000694 effects Effects 0.000 abstract description 10
- 239000000835 fiber Substances 0.000 description 9
- 238000010586 diagram Methods 0.000 description 7
- 238000004891 communication Methods 0.000 description 5
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
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- G06T5/70—
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T5/00—Image enhancement or restoration
- G06T5/50—Image enhancement or restoration by the use of more than one image, e.g. averaging, subtraction
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- G06T5/77—
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/70—Determining position or orientation of objects or cameras
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/80—Analysis of captured images to determine intrinsic or extrinsic camera parameters, i.e. camera calibration
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
- H04M1/026—Details of the structure or mounting of specific components
- H04M1/0264—Details of the structure or mounting of specific components for a camera module assembly
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/80—Camera processing pipelines; Components thereof
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The application discloses a calibration system, a calibration method, a calibration device and electronic equipment of a point spread function, and belongs to the technical field of images. The calibration system of the point spread function comprises: a device table; a movable part arranged on the device table; an electronic device disposed on the movable portion; a porous plate provided on the apparatus table; wherein, at least two through holes are arranged on the porous plate; a light emitting section; the light-emitting part is provided with at least two light-emitting units, and different light-emitting units are positioned in different through holes; the control unit is connected with the light-emitting parts and can control the on-off of at least two light-emitting units; the relative position of the electronic equipment and the light-emitting unit is adjusted through the movable part. And the electronic equipment can obtain a calibration image carrying the information of the point spread functions of a plurality of positions according to the first image and the second image which are obtained through shooting. The calibrated point spread function is more accurate; and when the calibration image is used for image recovery, the recovery effect is better.
Description
Technical Field
The application belongs to the technical field of image restoration, and particularly relates to a calibration system, a calibration method, a calibration device and electronic equipment of a point spread function.
Background
The mobile phone screen ratio represents the relative ratio of the screen area to the mobile phone front panel area, which is an important parameter for measuring the appearance of the mobile phone, and the mobile phone with higher screen ratio can obtain a larger screen with a smaller body, so that a larger operation space and better user experience are obtained.
At present, in order to improve the screen occupation ratio of a mobile phone and realize a real full screen, a camera is usually arranged below the screen of the mobile phone, and imaging is performed under the screen. But the quality of the off-screen imaging is severely affected by the diffraction of the incoming light by the cell phone screen. So that in order to obtain a clear image, it is necessary to restore the photographed image using a correlation algorithm.
Deconvolution algorithms using point spread functions are a common method of image restoration here. In this image restoration method, how to acquire an accurate point spread function plays a crucial role. However, the calibration of the point spread function in the prior art is not accurate enough, which results in a problem of poor image recovery effect.
Disclosure of Invention
The embodiment of the application aims to provide a calibration system, a calibration method, a calibration device and electronic equipment for a point spread function, which can solve the problem that the calibration of the point spread function is inaccurate in the prior art.
In order to solve the technical problems, the application is realized as follows:
in a first aspect, an embodiment of the present application provides a calibration system of a point spread function, where the calibration system of a point spread function includes:
a device table;
a movable part arranged on the device table;
an electronic device disposed on the movable portion;
a porous plate provided on the apparatus table; wherein, at least two through holes are arranged on the porous plate;
a light emitting section; wherein the light-emitting part is provided with at least two light-emitting units, and different light-emitting units are positioned in different through holes;
a control unit connected to the light emitting unit, wherein the at least two light emitting units are in a lit state when the control unit transmits a first signal to the light emitting unit; in the case that the control unit transmits a second signal to the light emitting part, the at least two light emitting units are in an off state;
the electronic equipment and the light-emitting unit adjust the relative position through the movable part;
The electronic equipment obtains a first image and a second image through shooting; the calibration system with the first image being the point spread function is positioned in a darkroom without a light source, and the electronic equipment shoots the obtained image; the calibration system with the second image being the point spread function is positioned in a darkroom with the at least two light-emitting units in a lighting state, and the electronic equipment shoots images obtained by the at least two light-emitting units; wherein the imaging size of each light emitting unit in the second image is smaller than or equal to the size of a single pixel point in the second image; the difference value between the focal length and the target distance when the electronic equipment shoots the second image is smaller than a preset threshold value; the target distance is the distance between the shooting unit of the electronic equipment and the porous plate when the electronic equipment shoots the second image;
the electronic equipment obtains a calibration image through target operation; the target operation comprises subtracting the first image from the second image, and the calibration image carries information of point spread functions at least two positions in a field of view of the electronic equipment.
Optionally, under the condition that the number of the second images is at least two, the electronic device obtains at least two target images through target operation for each second image and each first image; and obtaining the calibration image by averaging the at least two target images.
Optionally, the movable portion includes: a guide rail fixed to the apparatus table;
the first adjusting bracket is in sliding connection with the guide rail;
a second adjusting bracket connected with the first adjusting bracket;
the electronic equipment is arranged on the second adjusting bracket;
the second adjusting bracket and the device table adjust the relative position through the first adjusting bracket; the electronic equipment and the device table are used for adjusting the relative position through the second adjusting bracket.
Optionally, the light emitting part includes: a light source unit and at least two light emitting units connected with the light source unit respectively;
wherein the light source unit is connected with the control unit; the light source unit is in a lighting state when the control unit sends a first signal to the light emitting part; the light rays emitted by the light source unit are transmitted to the through hole through the light emitting unit; the light source unit is in an off state when the control unit transmits a second signal to the light emitting part.
Optionally, the light source unit includes a light emitting diode; the light-emitting unit is an output end of a multimode optical fiber with more than one turn; the input end of the multi-mode optical fiber with one rotation is connected with the light emitting diode, and each output end of the multi-mode optical fiber with one rotation is fixed in different through holes.
Optionally, the light emitting units are arranged in different through holes of the porous plate in a shape of a Chinese character 'mi'.
Optionally, the calibration system of the point spread function further includes:
and the external controller is connected with the electronic equipment, and the electronic equipment shoots through the shooting unit under the condition that the external controller sends a third signal to the electronic equipment.
In a second aspect, an embodiment of the present application provides a method for calibrating a point spread function, which is applied to an electronic device in a system for calibrating a point spread function as described above, where the method for calibrating a point spread function includes:
shooting to obtain a first image and a second image; the calibration system with the first image being the point spread function is positioned in a darkroom without a light source, and the electronic equipment shoots the obtained image; the calibration system with the second image being the point spread function is positioned in a darkroom with at least two light-emitting units in a lighting state, and the electronic equipment shoots images obtained by the at least two light-emitting units; wherein the imaging size of each light emitting unit in the second image is smaller than or equal to the size of a single pixel point in the second image; the difference value between the focal length and the target distance when the electronic equipment shoots the second image is smaller than a preset threshold value; the target distance is the distance between a shooting unit of the electronic equipment and a porous plate when the electronic equipment shoots to obtain the second image;
Obtaining a calibration image through target operation; the target operation comprises subtracting the first image from the second image, and the calibration image carries information of point spread functions at least two positions in a field of view of the electronic equipment.
Optionally, in the case that the number of the second images is at least two, the obtaining the calibration image through the target operation includes:
obtaining at least two target images through target operation aiming at each second image and each first image;
and obtaining the calibration image by averaging the at least two target images.
In a third aspect, an embodiment of the present application provides a calibration device for a point spread function, which is applied to an electronic device in a calibration system for a point spread function as described above, where the calibration device for a point spread function includes:
the shooting module is used for shooting to obtain a first image and a second image; the calibration system with the first image being the point spread function is positioned in a darkroom without a light source, and the electronic equipment shoots the obtained image; the calibration system with the second image being the point spread function is positioned in a darkroom with at least two light-emitting units in a lighting state, and the electronic equipment shoots images obtained by the at least two light-emitting units; wherein the imaging size of each light emitting unit in the second image is smaller than or equal to the size of a single pixel point in the second image; the difference value between the focal length and the target distance when the electronic equipment shoots the second image is smaller than a preset threshold value; the target distance is the distance between a shooting unit of the electronic equipment and a porous plate when the electronic equipment shoots to obtain the second image;
The generating module is used for obtaining a calibration image through target operation; the target operation comprises subtracting the first image from the second image, and the calibration image carries information of point spread functions at least two positions in a field of view of the electronic equipment.
Optionally, in the case that the number of the second images is at least two, the generating module includes:
a first calculation unit configured to obtain at least two target images by target operations for each of the second image and the first image;
and the second calculation unit is used for obtaining the calibration image by averaging the at least two target images.
In a fourth aspect, an embodiment of the present application provides an electronic device, including a processor, a memory, and a program or instructions stored on the memory and executable on the processor, where the program or instructions, when executed by the processor, implement the steps of the method for calibrating a point spread function according to the second aspect.
In a fifth aspect, embodiments of the present application provide a readable storage medium having stored thereon a program or instructions which, when executed by a processor, implement the steps of the method for calibrating a point spread function according to the second aspect.
In a sixth aspect, an embodiment of the present application provides a chip, where the chip includes a processor and a communication interface, where the communication interface is coupled to the processor, and the processor is configured to execute a program or instructions to implement a calibration method for a point spread function according to the second aspect.
In the embodiment of the application, the relative position between the electronic equipment and the light-emitting units on the porous plate can be adjusted through the movable part, so that the calibration system of the point spread function meets the preset shooting condition. Then, the control unit controls the on/off of the light emitting unit and the electronic device shoots, so that a first image without a light source and a second image with the light source can be obtained. And subtracting the first image from the second image to eliminate noise influence in the process of shooting the second image, so as to obtain a calibration image carrying the point spread function information. Further, since the number of light sources in the second image is at least two, there are also at least two light sources in the obtained calibration image. In this way, the calibration image carries the information of the point spread function at least two positions in the view field of the electronic equipment, so that the calibrated point spread function is more accurate; and when the calibration image is used for image recovery, the recovery effect is better.
Drawings
FIG. 1 is a schematic diagram of a calibration system of a point spread function according to an embodiment of the present application;
FIG. 2 is a schematic view of the structure of the movable part in the embodiment of the present application;
FIG. 3 is a schematic view of the structure of a porous plate in an embodiment of the present application;
FIG. 4 is a schematic diagram of a practical application of a calibration system for a point spread function according to an embodiment of the present application;
FIG. 5 is a yz-direction view of a porous plate in an embodiment of the present application;
FIG. 6 is an xz-direction view of a perforated plate in an embodiment of the present application;
FIG. 7 is a flow chart of steps of a method for calibrating a point spread function according to an embodiment of the present application;
FIG. 8 is a block diagram of a calibration device for a point spread function according to an embodiment of the present application;
fig. 9 is a schematic diagram of a hardware structure of an electronic device according to an embodiment of the present application.
Fig. 10 is a second schematic diagram of a hardware structure of an electronic device according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
The terms first, second and the like in the description and in the claims, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged, as appropriate, such that embodiments of the present application may be implemented in sequences other than those illustrated or described herein, and that the objects identified by "first," "second," etc. are generally of a type and not limited to the number of objects, e.g., the first object may be one or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.
The calibration system of the point spread function provided by the embodiment of the application is described in detail below by means of specific embodiments and application scenes thereof with reference to the accompanying drawings.
As shown in fig. 1, the calibration system of the point spread function provided in the embodiment of the present application includes:
a device table (not shown);
a movable part 11 provided on the device table;
an electronic device 12 provided on the movable portion 11;
A perforated plate 13 provided on the apparatus table; wherein, the porous plate 13 is provided with at least two through holes;
a light emitting section 14; wherein the light emitting part 14 is provided with at least two light emitting units (not shown in the figure), different light emitting units being located in different through holes;
a control unit 15 connected to the light emitting unit 14, wherein when the control unit 15 transmits a first signal to the light emitting unit 14, at least two light emitting units are in a lit state; in the case where the control unit 15 sends the second signal to the light emitting section 14, at least two light emitting units are in an off state;
the electronic device 12 and the light-emitting unit adjust the relative position through the movable part 11;
the electronic device 12 obtains a first image and a second image by photographing; the calibration system, where the first image is a point spread function, is in a dark room without a light source, and the electronic device 12 captures the resulting image; the calibration system with the second image being a point spread function is positioned in a dark room with at least two light emitting units in a lighting state, and the electronic equipment 12 shoots images obtained by the at least two light emitting units; wherein the imaging size of each light emitting unit in the second image is smaller than or equal to the size of a single pixel point in the second image; the difference between the focal length and the target distance when the electronic device 12 captures the second image is less than a preset threshold; when the electronic device 12 shoots and obtains the second image, the target distance is the distance between the shooting unit of the electronic device 12 and the porous plate 13;
The electronic device 12 obtains a calibration image through target operation; wherein the target operation comprises subtracting the first image from the second image, the calibration image carrying information of the point spread function at least two locations in the field of view of the electronic device 12.
It should be noted that the apparatus table is used to fix the relative positions among the movable portion 11, the electronic device 12, the porous plate 13, and the light emitting portion 14. After the relative positions of the movable part 11, the electronic device 12, the porous plate 13, and the light emitting part 14 are fixed, one or at least two of them are prevented from being displaced, thereby affecting the final result. Preferably, in capturing the first image and the second image, the relative positions of the movable portion 11, the electronic device 12, the porous plate 13, and the light emitting portion 14 are kept uniform in order to reduce the influence in terms of environment. That is, the process of photographing the second image is different from the process of photographing the first image in that the light emitting unit is in a lit state when photographing the second image; the light emitting unit is in an off state when the second image is captured.
The movable part 11 is movably connected with the device table, and the movable part 11 moves on the device table to drive the electronic equipment 12 to move, so that the relative positions of the electronic equipment 12 and the light-emitting unit are changed.
The through holes on the porous plate 13 can be used for placing the light-emitting units, and can also be idle. That is, the light emitting units may be disposed in all or part of the through holes on the porous plate 13. Here, at least two light emitting units may be disposed in different through holes in an arbitrary arrangement. Preferably, all the light emitting units are located on the perforated plate 13, so that all the light emitting units are located in the same plane.
Here, the electronic apparatus 12 needs to photograph the light emitting unit on the porous plate 13, and thus the porous plate 13 is located on the side of the electronic apparatus 12 where the photographing unit is provided, the photographing unit being a structure for photographing an image in the electronic apparatus 12. The image capturing unit of the electronic device 12 is located below the display screen on the electronic device 12, that is, the electronic device 12 captures an image in an off-screen imaging manner, but is not limited thereto. Taking the electronic device 12 as a mobile phone as an example, the camera unit may be a front camera of the mobile phone. The front camera is positioned below the mobile phone screen.
In addition, the electronic device 12 may be at least two devices having a connection relationship, one of the devices having a photographing function and the other device having a function of calculating a calibration image. For example, the electronic device 12 includes a cell phone and a computer connected to each other; the mobile phone has a shooting function, and the computer has a function of calculating a calibration image. Of course, the electronic device 12 may be a single device having a photographing function and a function of calculating the calibration image. Here, in the process of calculating the calibration image by the electronic device 12, the subtraction of the images is that the corresponding pixels between the images are subtracted, which is widely used in a plurality of fields, and therefore will not be described herein again
In this embodiment, the movable portion 11 can adjust the relative position between the electronic device 12 and the light emitting unit on the porous plate 13, so that the calibration system of the point spread function satisfies the preset shooting condition. The lighting unit is then controlled on and off by the control unit 15 and photographed by the electronic device 12, whereby a first image without a light source and a second image with a light source can be obtained. And subtracting the first image from the second image to eliminate noise influence in the process of shooting the second image, so as to obtain a calibration image carrying the point spread function information. Further, since the number of light sources in the second image is at least two, there are also at least two light sources in the obtained calibration image. In this way, the calibration image will carry information of the point spread function at least two positions in the field of view of the electronic device 12, so that the calibrated point spread function is more accurate; and when the calibration image is used for image recovery, the recovery effect is better.
Optionally, under the condition that the number of the second images is at least two, the electronic device obtains at least two target images through target operation aiming at each second image and each first image; and obtaining the calibration image by averaging at least two target images.
The subtraction of the images is that the corresponding pixels between the images are subjected to subtraction operation; the subtraction operation between pixels means that the pixel values of the pixels are subtracted; correspondingly, the average value between the images is that the corresponding pixels between the images are subjected to average value operation, and the details are not repeated here.
In the embodiment of the application, at least two second images can be shot, and mean value operation is performed after each second image is denoised, so that the information of the point spread function carried in the calibration image is more accurate.
Alternatively, referring to fig. 2, the movable portion includes: a guide rail 21 fixed to the apparatus table;
a first adjustment bracket 22 slidably connected to the guide rail 21;
a second adjusting bracket 23 connected to the first adjusting bracket 22;
the electronic device 12 is arranged on the second adjusting bracket 23;
the second adjusting bracket 23 and the device table adjust the relative position through the first adjusting bracket 22; the electronic device 12 and the apparatus table are adjusted in relative position by the second adjusting bracket 23.
Here, when the first adjusting bracket 22 slides along the guide rail 21, the second adjusting bracket 23 is driven to move together with the electronic device 12, so that the distance between the electronic device 12 and the porous plate can be adjusted. Meanwhile, the first adjusting bracket 22 can also adjust the included angle between the second adjusting bracket 23 and the device table, so as to indirectly adjust the relative position between the electronic equipment 12 and the device table on the second adjusting bracket 23. The second adjusting bracket 23 can also directly adjust the relative position between the electronic device 12 and the apparatus table, i.e. adjust the distance between the electronic device 12 and the apparatus table, and adjust the electronic device 12 to freely move in a plane parallel to the apparatus table surface above the apparatus table. Taking the electronic device 12 as an example of a mobile phone, the first adjusting bracket 22 can indirectly adjust the included angle between the plane of the mobile phone screen and the table top of the device table. The distance between the mobile phone and the table top of the device table can be directly adjusted through the second adjusting bracket 23; the second adjusting bracket 23 can also adjust the position of the mobile phone in a plane above and parallel to the table top of the device table.
In this embodiment, through the cooperation of the guide rail 21, the first adjusting bracket 22 and the second adjusting bracket 23, the electronic device 12 can be moved to different space positions, so as to realize the free adjustment of the relative position between the electronic device 12 and the porous plate.
Optionally, the light emitting part includes: the light source unit and at least two light emitting units are respectively connected with the light source unit;
wherein the light source unit is connected with the control unit; when the control unit sends a first signal to the light emitting part, the light source unit is in a lighting state; the light emitted by the light source unit is transmitted to the through hole through the light emitting unit; when the control unit transmits the second signal to the light emitting unit, the light source unit is in an off state.
Here, the light source unit is a light source in a lit state; in the extinguished state, is a non-light source. The light emitting unit can emit light not by itself, but after receiving the light emitted by the light source unit, the light is transmitted to the through hole by reflection, refraction and other modes.
Specifically, the light source unit includes a light emitting diode; the light-emitting unit is an output end of a multimode optical fiber with more than one turn; the input end of the multimode fiber with one rotation is connected with the light emitting diode, and each output end of the multimode fiber with one rotation is fixed in different through holes. Here, the input end of the multimode optical fiber is connected to the light emitting diode, and the end face of the input end may be abutted against the light emitting diode. Preferably, when the output end of the multimode optical fiber is fixed in the through hole, the end face of the output end is parallel to the porous plate, but is not limited thereto. The light emitting diode can be an optical fiber coupling light emitting diode, an optical fiber seat is arranged on the light emitting diode, and an optical fiber of the input end of the multi-mode optical fiber with one rotation can be inserted into the optical fiber seat of the optical fiber coupling light emitting diode. Similarly, the through hole of the porous plate is provided with an optical fiber seat, and the optical fiber at the output end of the multimode optical fiber with more than one turn is inserted into the optical fiber seat on the porous plate.
It should be noted that, in order to ensure that the imaging size of each light emitting unit in the second image is smaller than or equal to the size of a single pixel point in the second image, when the second image is obtained through shooting, a target formula needs to be satisfied, and an electronic device is also taken as an example of a mobile phone.
The target formula is:
wherein D is S Representing the diameter of the fiber core, L representing the distance from the light-emitting unit to the lens of the mobile phone, L' representing the distance from the lens of the mobile phone to the image sensor, and h representing the size of a single pixel when the image sensor images.
Optionally, the light emitting units are arranged in different through holes of the porous plate in a shape of a Chinese character 'mi'. Referring to fig. 3, a schematic structure of a porous plate is shown, wherein each circle represents a through hole. When the light emitting units are arranged in the through holes, one light emitting unit may be arranged at each of the following nine coordinates.
Nine coordinates are (0, 0), (m.x, 0), (-m.x, 0), (0, m.y), (0, -m.y), (m.x, m.y), (-m.x, m.y), (m.x, -m.y), (-m.x, -m.y) respectively; wherein, (0, 0) represents the center of the field of view of the camera unit in the electronic device; x is half of the length of the field of view of the camera unit in the horizontal direction; y is half of the length of the vertical direction of the field of view of the camera unit in the electronic device; m is a field of view coefficient, wherein m is greater than zero and less than or equal to 1. Specifically, after the light emitting units are arranged in the perforated plate according to the above nine coordinates, the positions of the light emitting units are at the through holes in the nine boxes. Of course, the light emitting units may be arranged on the porous plate in other arrangements, either in a regular arrangement or in an irregular arrangement.
Optionally, the calibration system of the point spread function further includes:
and an external controller connected with the electronic device, wherein the electronic device performs shooting through the shooting unit when the external controller sends a third signal to the electronic device.
Here, the external controller may control the electronic device to capture an image. The external controller is connected with the electronic device wirelessly or by wire.
In the embodiment of the application, the electronic equipment is controlled by the external controller to shoot the image, so that the electronic equipment is prevented from being directly touched, the electronic equipment is prevented from shaking, and the influence on a final result is avoided.
As shown in fig. 4, a schematic diagram of practical application of the calibration system of the point spread function according to the embodiment of the present application includes:
a device table;
a movable part arranged on the device table;
an electronic device disposed on the movable portion;
a perforated plate 41 provided on the apparatus table; wherein, at least two through holes are arranged on the porous plate 41;
a light emitting section; wherein the light-emitting part is provided with at least two light-emitting units, and different light-emitting units are positioned in different through holes;
a control unit 42 for controlling the on/off of the at least two light emitting units, the control unit 42 being connected to the light emitting part;
Wherein, the movable part includes: a guide rail 43 fixed to the apparatus table; a first adjustment bracket 44 slidably coupled to the guide rail 43; a second adjusting bracket 45 connected to the first adjusting bracket 44; the electronic equipment is arranged on the second adjusting bracket 45;
the light emitting section includes: the optical fiber coupling light emitting diode 48 is provided with an optical fiber seat thereon; the multi-turn multimode optical fiber 49, the optical fiber at the input end of the multi-turn multimode optical fiber 49 may be inserted into the fiber holder of the fiber-coupled light emitting diode 48. The through hole of the porous plate 41 is provided with a fiber holder, and the fiber at the output end of the multimode fiber 49 of one revolution can be inserted into the fiber holder on the porous plate 41. Specifically, the optical fibers at the output end include nine optical fibers, and are inserted into through holes in the box shown in fig. 3. A view thereof in the yz direction is shown in fig. 5; the view in xz direction is shown in fig. 6. Here, the z-axis direction is the normal direction of the focal plane of the mobile phone, and the xy-plane is the plane in which the focal plane of the mobile phone is located.
The electronic device comprises a mobile phone 46 fixed on the second adjusting bracket 45 and a computer 47 connected with the mobile phone 46.
When the point spread function is calibrated by the calibration system of the point spread function, the movable part, the porous plate 41 and the mobile phone 46 are adjusted to enable the porous plate 41 to be parallel to the screen of the mobile phone 46, so that the porous plate is porous The light emitting unit located at the center of the plate 41 coincides with the center of the field of view when the mobile phone 46 photographs, and the focal length of the mobile phone 46 is equal to the distance between the mobile phone 46 and the porous plate 41, and the above objective formula is satisfied, which will not be described here again. Then the system is placed in a darkroom environment to extinguish the light emitting unit, and the mobile phone 46 is controlled to shoot to obtain a first image I 0 . Then the light-emitting unit is turned on to control the mobile phone 46 to continuously shoot a plurality of images I i Where i=1, 2, …, N. The mobile phone 46 transmits the raw data of the photographed image to the computer 47. The computer 47 calculates the following formula:
i=1, 2, …, N; and calculating to obtain a calibration image I.
Fig. 7 is a schematic step diagram of a method for calibrating a point spread function according to an embodiment of the present application, where the method for calibrating a point spread function is applied to an electronic device in the system for calibrating a point spread function according to the embodiment of the present application, and the method for calibrating a point spread function includes:
in step 701, a first image and a second image are captured.
In the step, a calibration system with a first image as a point spread function is positioned in a dark room without a light source, and an electronic device shoots the obtained image; the calibration system with the second image being a point spread function is positioned in a dark room with at least two light-emitting units in a lighting state, and the electronic equipment shoots images obtained by the at least two light-emitting units; wherein the imaging size of each light emitting unit in the second image is smaller than or equal to the size of a single pixel point in the second image; the difference value between the focal length and the target distance when the electronic equipment shoots the second image is smaller than a preset threshold value; the target distance is the distance between the shooting unit of the electronic equipment and the porous plate when the electronic equipment shoots to obtain a second image; .
In this step, the target operation includes subtracting the first image from the second image, and the calibration image carries information of point spread functions at least two positions in the field of view of the electronic device.
In the embodiment of the application, a first image without a light source and a second image with the light source are obtained through shooting. And subtracting the first image from the second image to eliminate noise influence in the process of shooting the second image, so as to obtain a calibration image carrying the point spread function information. Further, since the number of light sources in the second image is at least two, there are also at least two light sources in the obtained calibration image. In this way, the calibration image carries the information of the point spread function at least two positions in the view field of the electronic equipment, so that the calibrated point spread function is more accurate; and when the calibration image is used for image recovery, the recovery effect is better.
Optionally, in the case that the number of the second images is at least two, obtaining the calibration image through the target operation includes:
obtaining at least two target images through target operation aiming at each second image and each first image;
And obtaining a calibration image by averaging at least two target images.
In the embodiment of the application, at least two second images can be shot, and mean value operation is performed after each second image is denoised, so that the information of the point spread function carried in the calibration image is more accurate.
It should be noted that, in the calibration method of a point spread function provided in the embodiment of the present application, the execution body may be a calibration device of a point spread function, or a control module for executing the calibration method of a point spread function in the calibration device of a point spread function. In the embodiment of the application, the calibration method of the point spread function performed by the calibration device of the point spread function is taken as an example, and the calibration device of the point spread function provided in the embodiment of the application is described.
As shown in fig. 8, the embodiment of the present application further provides a calibration device for a point spread function, which is applied to an electronic device in the calibration system for a point spread function in the embodiment of the present application, where the calibration device for a point spread function includes:
a shooting module 801, configured to shoot and obtain a first image and a second image; the calibration system with the first image as a point spread function is positioned in a dark room without a light source, and the electronic equipment shoots the obtained image; the calibration system with the second image being a point spread function is positioned in a dark room with at least two light-emitting units in a lighting state, and the electronic equipment shoots images obtained by the at least two light-emitting units; wherein the imaging size of each light emitting unit in the second image is smaller than or equal to the size of a single pixel point in the second image; the difference value between the focal length and the target distance when the electronic equipment shoots the second image is smaller than a preset threshold value; the target distance is the distance between the shooting unit of the electronic equipment and the porous plate when the electronic equipment shoots to obtain a second image;
A generating module 802, configured to obtain a calibration image through a target operation; the target operation comprises subtracting the first image from the second image, and the calibration image carries information of point spread functions at least two positions in a field of view of the electronic equipment.
Optionally, in the case that the number of the second images is at least two, the generating module 802 includes:
the first computing unit is used for obtaining at least two target images through target operation aiming at each second image and each first image;
the second calculation unit is used for obtaining a calibration image by averaging at least two target images.
In the embodiment of the application, a first image without a light source and a second image with the light source are obtained through shooting. And subtracting the first image from the second image to eliminate noise influence in the process of shooting the second image, so as to obtain a calibration image carrying the point spread function information. Further, since the number of light sources in the second image is at least two, there are also at least two light sources in the obtained calibration image. In this way, the calibration image carries the information of the point spread function at least two positions in the view field of the electronic equipment, so that the calibrated point spread function is more accurate; and when the calibration image is used for image recovery, the recovery effect is better.
The calibration device of the point spread function in the embodiment of the application can be a device, and also can be a component, an integrated circuit or a chip in a terminal. The device may be a mobile electronic device or a non-mobile electronic device. By way of example, the mobile electronic device may be a cell phone, tablet computer, notebook computer, palm computer, vehicle-mounted electronic device, wearable device, ultra-mobile personal computer (ultra-mobile personal computer, UMPC), netbook or personal digital assistant (personal digital assistant, PDA), etc., and the non-mobile electronic device may be a server, network attached storage (Network Attached Storage, NAS), personal computer (personal computer, PC), television (TV), teller machine or self-service machine, etc., and the embodiments of the present application are not limited in particular.
The calibration device of the point spread function in the embodiment of the present application may be a device with an operating system. The operating system may be an Android operating system, an iOS operating system, or other possible operating systems, which are not specifically limited in the embodiments of the present application.
Optionally, as shown in fig. 9, the embodiment of the present application further provides an electronic device 900, including a processor 901, a memory 902, and a program or an instruction stored in the memory 902 and capable of being executed on the processor 901, where the program or the instruction implements each process of the calibration method embodiment of the point spread function when executed by the processor 901, and the process can achieve the same technical effect, and for avoiding repetition, a description is omitted herein.
The electronic device in the embodiment of the application includes the mobile electronic device and the non-mobile electronic device.
Fig. 10 is a schematic hardware structure of an electronic device implementing an embodiment of the present application.
The electronic device 1000 includes, but is not limited to: radio frequency unit 1001, network module 1002, audio output unit 1003, input unit 1004, sensor 1005, display unit 1006, user input unit 1007, interface unit 1008, memory 1009, and processor 1010.
Those skilled in the art will appreciate that the electronic device 1000 may also include a power source (e.g., a battery) for powering the various components, which may be logically connected to the processor 1010 by a power management system to perform functions such as managing charge, discharge, and power consumption by the power management system. The electronic device structure shown in fig. 10 does not constitute a limitation of the electronic device, and the electronic device may include more or less components than shown, or may combine certain components, or may be arranged in different components, which are not described in detail herein.
A sensor 1005 for capturing a first image and a second image; the calibration system with the first image as a point spread function is positioned in a dark room without a light source, and the electronic equipment shoots the obtained image; the calibration system with the second image being a point spread function is positioned in a dark room with at least two light-emitting units in a lighting state, and the electronic equipment shoots images obtained by the at least two light-emitting units; wherein the imaging size of each light emitting unit in the second image is smaller than or equal to the size of a single pixel point in the second image; the difference value between the focal length and the target distance when the electronic equipment shoots the second image is smaller than a preset threshold value; the target distance is the distance between the shooting unit of the electronic equipment and the porous plate when the electronic equipment shoots to obtain a second image;
A processor 1010 for obtaining a calibration image by a target operation; the target operation comprises subtracting the first image from the second image, and the calibration image carries information of point spread functions at least two positions in a field of view of the electronic equipment.
In the embodiment of the application, a first image without a light source and a second image with the light source are obtained through shooting. And subtracting the first image from the second image to eliminate noise influence in the process of shooting the second image, so as to obtain a calibration image carrying the point spread function information. Further, since the number of light sources in the second image is at least two, there are also at least two light sources in the obtained calibration image. In this way, the calibration image carries the information of the point spread function at least two positions in the view field of the electronic equipment, so that the calibrated point spread function is more accurate; and when the calibration image is used for image recovery, the recovery effect is better.
Optionally, in the case that the number of the second images is at least two, the processor 1010 is specifically configured to obtain at least two target images by performing a target operation for each of the second images and the first images; and obtaining a calibration image by averaging at least two target images.
In the embodiment of the application, at least two second images can be shot, and mean value operation is performed after each second image is denoised, so that the information of the point spread function carried in the calibration image is more accurate.
It should be understood that in the embodiment of the present application, the input unit 1004 may include a graphics processor (Graphics Processing Unit, GPU) 10041 and a microphone 10042, and the graphics processor 10041 processes image data of still pictures or videos obtained by an image capturing device (such as a camera) in a video capturing mode or an image capturing mode. The display unit 1006 may include a display panel 10061, and the display panel 10061 may be configured in the form of a liquid crystal display, an organic light emitting diode, or the like. The user input unit 1007 includes a touch panel 10071 and other input devices 10072. The touch panel 10071 is also referred to as a touch screen. The touch panel 10071 can include two portions, a touch detection device and a touch controller. Other input devices 10072 may include, but are not limited to, a physical keyboard, function keys (e.g., volume control keys, switch keys, etc.), a trackball, a mouse, a joystick, and so forth, which are not described in detail herein. Memory 1009 may be used to store software programs as well as various data including, but not limited to, application programs and an operating system. The processor 1010 may integrate an application processor that primarily handles operating systems, user interfaces, applications, etc., with a modem processor that primarily handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 1010.
The embodiment of the application further provides a readable storage medium, on which a program or an instruction is stored, where the program or the instruction implements each process of the calibration method embodiment of the point spread function when executed by a processor, and the same technical effect can be achieved, so that repetition is avoided, and no further description is given here.
Wherein the processor is a processor in the electronic device described in the above embodiment. The readable storage medium includes a computer readable storage medium such as a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk or an optical disk, and the like.
The embodiment of the application further provides a chip, the chip includes a processor and a communication interface, the communication interface is coupled with the processor, the processor is used for running a program or an instruction, implementing each process of the calibration method embodiment of the point spread function, and achieving the same technical effect, so as to avoid repetition, and no further description is provided here.
It should be understood that the chips referred to in the embodiments of the present application may also be referred to as system-on-chip chips, chip systems, or system-on-chip chips, etc.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Furthermore, it should be noted that the scope of the methods and apparatus in the embodiments of the present application is not limited to performing the functions in the order shown or discussed, but may also include performing the functions in a substantially simultaneous manner or in an opposite order depending on the functions involved, e.g., the described methods may be performed in an order different from that described, and various steps may also be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk), including several instructions for causing a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to perform the method described in the embodiments of the present application.
The embodiments of the present application have been described above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those of ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are also within the protection of the present application.
Claims (12)
1. A calibration system for a point spread function, the calibration system comprising:
a device table;
a movable part arranged on the device table;
an electronic device disposed on the movable portion;
a porous plate provided on the apparatus table; wherein, at least two through holes are arranged on the porous plate;
a light emitting section; wherein the light-emitting part is provided with at least two light-emitting units, and different light-emitting units are positioned in different through holes;
a control unit connected to the light emitting unit, wherein the at least two light emitting units are in a lit state when the control unit transmits a first signal to the light emitting unit; in the case that the control unit transmits a second signal to the light emitting part, the at least two light emitting units are in an off state;
The electronic equipment and the light-emitting unit adjust the relative position through the movable part;
the electronic equipment obtains a first image and a second image through shooting; the calibration system with the first image being the point spread function is positioned in a darkroom without a light source, and the electronic equipment shoots the obtained image; the calibration system with the second image being the point spread function is positioned in a darkroom with the at least two light-emitting units in a lighting state, and the electronic equipment shoots images obtained by the at least two light-emitting units; wherein the imaging size of each light emitting unit in the second image is smaller than or equal to the size of a single pixel point in the second image; the difference value between the focal length and the target distance when the electronic equipment shoots the second image is smaller than a preset threshold value; the target distance is the distance between the shooting unit of the electronic equipment and the porous plate when the electronic equipment shoots the second image;
the electronic equipment obtains a calibration image through target operation; the target operation comprises subtracting the first image from the second image, and the calibration image carries information of point spread functions at least two positions in a field of view of the electronic equipment.
2. The calibration system of a point spread function according to claim 1, wherein in the case where the number of the second images is at least two, the electronic device obtains at least two target images by target operation for each of the second images and the first images; and obtaining the calibration image by averaging the at least two target images.
3. The calibration system of a point spread function according to claim 1, wherein the movable part includes: a guide rail fixed to the apparatus table;
the first adjusting bracket is in sliding connection with the guide rail;
a second adjusting bracket connected with the first adjusting bracket;
the electronic equipment is arranged on the second adjusting bracket;
the second adjusting bracket and the device table adjust the relative position through the first adjusting bracket; the electronic equipment and the device table are used for adjusting the relative position through the second adjusting bracket.
4. The calibration system of a point spread function according to claim 1, wherein the light emitting section includes: a light source unit and at least two light emitting units connected with the light source unit respectively;
wherein the light source unit is connected with the control unit; the light source unit is in a lighting state when the control unit sends a first signal to the light emitting part; the light rays emitted by the light source unit are transmitted to the through hole through the light emitting unit; the light source unit is in an off state when the control unit transmits a second signal to the light emitting part.
5. The calibration system of point spread function according to claim 4, wherein said light source unit comprises a light emitting diode; the light-emitting unit is an output end of a multimode optical fiber with more than one turn; the input end of the multi-mode optical fiber with one rotation is connected with the light emitting diode, and each output end of the multi-mode optical fiber with one rotation is fixed in different through holes.
6. The system according to claim 1, wherein the light emitting units are arranged in a zig-zag fashion in different through holes of the porous plate.
7. The system for calibrating a point spread function according to claim 1, wherein the system for calibrating a point spread function further comprises:
and the external controller is connected with the electronic equipment, and the electronic equipment shoots through the shooting unit under the condition that the external controller sends a third signal to the electronic equipment.
8. A method for calibrating a point spread function, applied to an electronic device in a system for calibrating a point spread function according to any one of claims 1 to 7, the method for calibrating a point spread function comprising:
shooting to obtain a first image and a second image; the calibration system with the first image being the point spread function is positioned in a darkroom without a light source, and the electronic equipment shoots the obtained image; the calibration system with the second image being the point spread function is positioned in a darkroom with at least two light-emitting units in a lighting state, and the electronic equipment shoots images obtained by the at least two light-emitting units; wherein the imaging size of each light emitting unit in the second image is smaller than or equal to the size of a single pixel point in the second image; the difference value between the focal length and the target distance when the electronic equipment shoots the second image is smaller than a preset threshold value; the target distance is the distance between a shooting unit of the electronic equipment and a porous plate when the electronic equipment shoots to obtain the second image;
Obtaining a calibration image through target operation; the target operation comprises subtracting the first image from the second image, and the calibration image carries information of point spread functions at least two positions in a field of view of the electronic equipment.
9. The method according to claim 8, wherein, in the case where the number of the second images is at least two, the obtaining the calibration image by the target operation includes:
obtaining at least two target images through target operation aiming at each second image and each first image;
and obtaining the calibration image by averaging the at least two target images.
10. A calibration device for a point spread function, characterized in that it is applied to an electronic apparatus in a calibration system for a point spread function according to any one of claims 1 to 7, the calibration device for a point spread function comprising:
the shooting module is used for shooting to obtain a first image and a second image; the calibration system with the first image being the point spread function is positioned in a darkroom without a light source, and the electronic equipment shoots the obtained image; the calibration system with the second image being the point spread function is positioned in a darkroom with at least two light-emitting units in a lighting state, and the electronic equipment shoots images obtained by the at least two light-emitting units; wherein the imaging size of each light emitting unit in the second image is smaller than or equal to the size of a single pixel point in the second image; the difference value between the focal length and the target distance when the electronic equipment shoots the second image is smaller than a preset threshold value; the target distance is the distance between a shooting unit of the electronic equipment and a porous plate when the electronic equipment shoots to obtain the second image;
The generating module is used for obtaining a calibration image through target operation; the target operation comprises subtracting the first image from the second image, and the calibration image carries information of point spread functions at least two positions in a field of view of the electronic equipment.
11. The apparatus according to claim 10, wherein the generating module includes, in the case where the number of the second images is at least two:
a first calculation unit configured to obtain at least two target images by target operations for each of the second image and the first image;
and the second calculation unit is used for obtaining the calibration image by averaging the at least two target images.
12. An electronic device comprising a processor, a memory and a program or instruction stored on the memory and executable on the processor, the program or instruction when executed by the processor implementing the steps of the method of calibrating a point spread function according to claim 8 or 9.
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| CN108830805A (en) * | 2018-05-25 | 2018-11-16 | 北京小米移动软件有限公司 | Image processing method, device and readable storage medium storing program for executing, electronic equipment |
| CN211121090U (en) * | 2019-12-12 | 2020-07-28 | 广东省航空航天装备技术研究所 | Three-dimensional profile measuring system based on point spread function engineering |
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