CN112215777A - 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 PDF

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Publication number
CN112215777A
CN112215777A CN202011127875.XA CN202011127875A CN112215777A CN 112215777 A CN112215777 A CN 112215777A CN 202011127875 A CN202011127875 A CN 202011127875A CN 112215777 A CN112215777 A CN 112215777A
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China
Prior art keywords
image
point spread
calibration
electronic equipment
spread function
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Granted
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CN202011127875.XA
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Chinese (zh)
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CN112215777B (en
Inventor
周恩至
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Vivo Mobile Communication Co Ltd
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Vivo Mobile Communication Co Ltd
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    • G06T5/70—
    • 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
    • G06T5/77—
    • 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
    • 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
    • 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
    • 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
    • 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 platform; an electronic device disposed on the movable portion; a perforated plate disposed on the apparatus table; wherein, the perforated plate is provided with at least two through holes; 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 and 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. The electronic equipment can obtain a calibration image carrying information of the point spread functions at a plurality of positions according to the first image and the second image obtained by shooting. The calibrated point spread function is more accurate; meanwhile, when the calibration image is used for image recovery, the recovery effect is better.

Description

Calibration system, calibration method, calibration device and electronic equipment of point spread function
Technical Field
The application belongs to the technical field of image recovery, 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 occupation ratio represents a relative ratio of the screen area and the area of the front panel of the mobile phone, which is an important parameter for measuring the appearance of the mobile phone, and the mobile phone with higher screen occupation ratio can obtain a larger screen with a smaller body, so that 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 comprehensive screen, a camera is generally arranged below a mobile phone screen, and imaging is carried out below the screen. But because the mobile phone screen can diffract the incoming light, the quality of the imaging under the screen is seriously affected. Therefore, in order to obtain a clear image, the captured image needs to be restored by using a correlation algorithm.
Here, deconvolution using a point spread function is a common image restoration method. In such an image restoration method, how to acquire an accurate point spread function plays a crucial role. However, in the prior art, the calibration of the point spread function is not accurate enough, and the image recovery effect is poor.
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, and can solve the problem that the point spread function in the prior art is not accurately calibrated.
In order to solve the technical problem, the present application is implemented as follows:
in a first aspect, an embodiment of the present application provides a calibration system for a point spread function, where the calibration system for a point spread function includes:
a device table;
a movable part arranged on the device platform;
an electronic device disposed on the movable portion;
a perforated plate disposed 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;
a control unit connected to the light emitting unit, the at least two light emitting units being in a lighting state when the control unit transmits a first signal to the light emitting unit; when the control unit transmits a second signal to the light emitting unit, the at least two light emitting units are in an off state;
the relative positions of the electronic equipment and the light-emitting unit are adjusted through the movable part;
the electronic equipment obtains a first image and a second image through shooting; the first image is an image obtained by shooting by the electronic equipment when the calibration system of the point spread function is in a darkroom without a light source; the second image is an image obtained by shooting the at least two light-emitting units by the electronic equipment, and the calibration system of the point spread function is positioned in a darkroom with the at least two light-emitting units in a lighting state; 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 obtains the second image through shooting is smaller than a preset threshold value; the target distance is the distance between a shooting unit of the electronic equipment and the porous plate when the electronic equipment shoots to obtain 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 the field of view of the electronic device.
Optionally, when the number of the second images is at least two, the electronic device obtains at least two target images through target operation on each second image and the first image; and obtaining the calibration image by averaging the at least two target images.
Optionally, the movable part includes: a guide rail fixed to the mounting table;
a first adjusting bracket slidably connected to 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 platform adjust relative positions through the first adjusting bracket; the relative position of the electronic equipment and the device platform is adjusted through the second adjusting bracket.
Optionally, the light emitting portion includes: a light source unit and at least two of the light emitting units respectively connected to the light source unit;
wherein the light source unit is connected with the control unit; the light source unit is in a lighting state when the control unit transmits a first signal to the light emitting unit; the light emitted by the light source unit is transmitted to the through hole through the light emitting unit; when the control unit transmits a second signal to the light emitting unit, the light source unit is in an off state.
Optionally, the light source unit includes a light emitting diode; the light-emitting unit is an output end of a multi-mode optical fiber with more than one turn; the input end of the multi-mode optical fiber with one rotation number is connected with the light emitting diode, and each output end of the multi-mode optical fiber with one rotation number is fixed in different through holes.
Optionally, the light emitting units are arranged in different through holes of the porous plate in a shape like 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 calibration method for a point spread function, which is applied to an electronic device in the calibration system for a point spread function as described above, where the calibration method for a point spread function includes:
shooting to obtain a first image and a second image; the first image is an image obtained by shooting by the electronic equipment when the calibration system of the point spread function is in a darkroom without a light source; the second image is an image obtained by shooting the at least two light-emitting units by the electronic equipment, wherein the calibration system of the point spread function is positioned in a darkroom with the at least two light-emitting units in a lighting state; 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 obtains the second image through shooting is smaller than a preset threshold value; the target distance is the distance between a shooting unit of the electronic equipment and the 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 the field of view of the electronic device.
Optionally, when 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 the 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 apparatus for a point spread function, which is applied to an electronic device in the calibration system for a point spread function described above, where the calibration apparatus for a point spread function includes:
the shooting module is used for shooting to obtain a first image and a second image; the first image is an image obtained by shooting by the electronic equipment when the calibration system of the point spread function is in a darkroom without a light source; the second image is an image obtained by shooting the at least two light-emitting units by the electronic equipment, wherein the calibration system of the point spread function is positioned in a darkroom with the at least two light-emitting units in a lighting state; 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 obtains the second image through shooting is smaller than a preset threshold value; the target distance is the distance between a shooting unit of the electronic equipment and the 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 the field of view of the electronic device.
Optionally, when the number of the second images is at least two, the generating module includes:
the first calculation unit is used for obtaining at least two target images through target operation aiming at each second image and the first image;
and the second calculating unit is used for obtaining the calibration image by averaging the at least two target images.
In a fourth aspect, the present application provides an electronic device, which includes 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 calibration method for point spread functions according to the second aspect.
In a fifth aspect, the present application provides a readable storage medium, on which a program or instructions are stored, and when executed by a processor, the program or instructions implement the steps of the calibration method for 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 the method for calibrating a point spread function according to the second aspect.
In the embodiment of the application, the relative position between the electronic device and the light-emitting unit 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 and off of the light-emitting unit, and the electronic equipment shoots the light-emitting unit, 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, eliminating the noise influence in the process of shooting the second image, and further obtaining a calibration image carrying point spread function information. Further, since the number of light sources in the second image is at least two, the obtained calibration image also has at least two light sources. Therefore, the calibrated image carries the information of the point spread functions at least two positions in the field of view of the electronic equipment, so that the calibrated point spread functions are more accurate; meanwhile, when the calibration image is used for image recovery, the recovery effect is better.
Drawings
FIG. 1 is a schematic structural diagram of a calibration system of a point spread function provided in an embodiment of the present application;
FIG. 2 is a schematic structural view of a movable part in the embodiment of the present application;
FIG. 3 is a schematic view of the structure of a multi-well plate in the embodiment of the present application;
FIG. 4 is a schematic diagram of an actual application of a calibration system for a point spread function provided in an embodiment of the present application;
FIG. 5 is a yz-direction view of the multi-well plate in the example of the present application;
FIG. 6 is a view showing the direction xz of the perforated plate in the embodiment of the present application;
FIG. 7 is a flowchart illustrating steps of a method for calibrating a point spread function according to an embodiment of the present disclosure;
fig. 8 is a block diagram of a structure of a calibration apparatus for a point spread function according to an embodiment of the present application;
fig. 9 is a schematic hardware structure diagram 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 technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be practiced in sequences other than those illustrated or described herein, and that the terms "first," "second," and the like are generally used herein in a generic sense and do not limit the number of terms, e.g., the first term can be one or more than one. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.
The calibration system of the point spread function provided in the embodiment of the present application is described in detail below with reference to the accompanying drawings through specific embodiments and application scenarios thereof.
As shown in fig. 1, a calibration system of a point spread function provided in an embodiment of the present application includes:
a fixture table (not shown);
a movable part 11 arranged on the device platform;
an electronic device 12 provided on the movable portion 11;
a porous plate 13 provided on the apparatus table; wherein, the perforated 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), and different light emitting units are positioned in different through holes;
a control unit 15 connected to the light emitting unit 14, wherein at least two light emitting units are in a lighting state when the control unit 15 transmits a first signal to the light emitting unit 14; in the case where the control unit 15 transmits the second signal to the light emitting unit 14, at least two light emitting units are in the off state;
the relative position of the electronic device 12 and the light-emitting unit is adjusted through the movable part 11;
the electronic device 12 obtains a first image and a second image by shooting; the first image is an image obtained by shooting by the electronic device 12 in a darkroom without a light source of a calibration system of a point spread function; the calibration system with the second image as the point spread function is located in a darkroom with at least two light-emitting units in a lighting state, and the electronic device 12 shoots images obtained by the at least two light-emitting units; 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 obtains the second image is smaller than the preset threshold; the target distance is the distance between the shooting unit of the electronic device 12 and the porous plate 13 when the electronic device 12 shoots to obtain the second image;
the electronic device 12 obtains a calibration image through target operation; 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 12.
It should be noted that the mounting table is used to fix the relative positions between 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 the process of 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 consistent in order to reduce the influence on the environment. That is, the process of capturing the second image is different from the process of capturing the first image in that the light emitting unit is in an on state when the second image is captured; the light emitting unit is in an off state when the second image is captured.
The movable portion 11 is movably connected to the mounting stage, and the movable portion 11 moves on the mounting stage to drive the electronic device 12 to move, so that the relative position between the electronic device 12 and the light emitting unit changes.
The through holes in the perforated plate 13 may receive the light emitting units or may be left unused. That is, the light emitting unit may be provided in all or part of the through holes on the porous plate 13. Here, the at least two light emitting cells may be disposed in different through holes in an arbitrary arrangement. Preferably, all the light emitting units are located on the porous 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 therefore the porous plate 13 is located on the side of the electronic apparatus 12 where the photographing unit is provided, which is a structure for photographing an image in the electronic apparatus 12. The camera unit of the electronic device 12 is located below the display screen of the electronic device 12, i.e. the electronic device 12 takes images by means of off-screen imaging, 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. Wherein, the front camera is positioned below the screen of the mobile phone.
In addition, the electronic device 12 may be at least two devices having a connection relationship, wherein one device has a shooting function and the other device has a function of calculating a calibration image. For example, the electronic device 12 includes a mobile 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 both a photographing function and a function of calculating a calibration image. Here, in the process of calculating the calibration image by the electronic device 12, image subtraction is to perform subtraction on corresponding pixels between images, and is widely applied in a plurality of fields, so that details are not repeated here
In the embodiment of the present application, the relative position between the electronic device 12 and the light emitting unit on the porous plate 13 can be adjusted by the movable portion 11, so that the calibration system of the point spread function satisfies the preset shooting condition. The lighting of the lighting unit is then controlled by the control unit 15 and captured by the electronic device 12, so that a first image without light source and a second image with light source can be obtained. And subtracting the first image from the second image, eliminating the noise influence in the process of shooting the second image, and further obtaining a calibration image carrying point spread function information. Further, since the number of light sources in the second image is at least two, the obtained calibration image also has at least two light sources. Thus, the calibrated image will carry information of the point spread functions at least two positions in the field of view of the electronic device 12, so that the calibrated point spread functions are more accurate; meanwhile, when the calibration image is used for image recovery, the recovery effect is better.
Optionally, when the number of the second images is at least two, the electronic device obtains at least two target images through target operation on each second image and the first image; and obtaining the calibration image by averaging at least two target images.
Subtracting the images to obtain corresponding pixels between the images for subtraction; the subtraction operation among the pixels means that the pixel values of the pixels are subjected to subtraction operation; correspondingly, the averaging between the images is to perform averaging operation on corresponding pixels between the images, which is not described herein again.
In the embodiment of the application, at least two second images can be obtained by shooting, and mean value operation is performed after denoising is performed on each second image, 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 mounting table;
a first adjusting bracket 22 slidably coupled 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 relative position of the second adjusting bracket 23 and the device platform is adjusted through the first adjusting bracket 22; the relative positions of the electronic device 12 and the mounting table are adjusted by the second adjusting bracket 23.
Here, the first adjusting bracket 22 slides along the guide rail 21, and the second adjusting bracket 23 is moved 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 an included angle between the second adjusting bracket 23 and the mounting table, thereby indirectly adjusting the relative position between the electronic device 12 and the mounting 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 mounting table, i.e. adjust the distance between the electronic device 12 and the mounting table, and adjust the electronic device 12 to move freely above the mounting table in a plane parallel to the table top of the mounting table. Taking the electronic device 12 as a mobile phone as an example, the first adjusting bracket 22 can indirectly adjust the included angle between the plane where the mobile phone screen is located and the table top of the mounting table. The distance between the mobile phone and the table surface 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 above the mounting table and in a plane parallel to the table surface of the mounting table.
In the embodiment of the present application, the electronic device 12 can be moved to different spatial positions by the cooperation of the guide rail 21, the first adjusting bracket 22 and the second adjusting bracket 23, so that the relative position between the electronic device 12 and the porous plate can be freely adjusted.
Optionally, the light emitting section includes: the light source unit and at least two light emitting units respectively connected with the light source unit;
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 the first signal to the light emitting part; 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 the lighting state; and a non-light source in an extinguished state. The light emitting unit can not emit light, but receives the light emitted by the light source unit and transmits the light to the through hole in the modes of reflection, refraction and the like.
Specifically, the light source unit includes a light emitting diode; the light-emitting unit is an output end of the multimode optical fiber with one rotation for multiple rotations; the input end of the multi-mode optical fiber with one rotation and multiple rotations is connected with the light emitting diode, and each output end of the multi-mode optical fiber with one rotation and multiple rotations is fixed in different through holes. Here, the input end of the multimode optical fiber may be connected to the light emitting diode such that an end surface of the input end abuts against the light emitting diode. Preferably, the end surface of the output end is parallel to the porous plate when the output end of the multimode optical fiber is fixed in the through hole, 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 the optical fiber at the input end of the multimode optical fiber with more than one turn 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 multi-mode optical fiber with 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 by shooting, the target formula needs to be satisfied, and the electronic device is also taken as a mobile phone as an example.
The target formula is:
Figure BDA0002732185430000101
wherein D isSThe diameter of the fiber core of the optical fiber is shown, L is the distance from the light-emitting unit to the mobile phone lens, L' is the distance from the mobile phone lens to the image sensor, and h is 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 like a Chinese character 'mi'. Referring to fig. 3, a schematic diagram of a multi-well plate is shown, wherein each circle represents a through hole. When the light emitting units are arranged in the through holes, the light emitting units may be arranged at each coordinate in nine coordinates as follows.
Nine coordinates are respectively (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); wherein, (0, 0) represents the center of the field of view of the image pickup unit in the electronic device; x is half the length of the horizontal direction of the camera unit field of view; y is half of the length of the vertical direction of the field of view of the image pickup unit in the electronic equipment; and m is a field coefficient, wherein m is greater than zero and less than or equal to 1. Specifically, after the light emitting units are arranged in the multi-hole plate according to the nine coordinates, the positions of the light emitting units are the through holes in the nine frames. 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 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 the third signal to the electronic equipment.
Here, the external controller may control the electronic device to capture an image. The external controller is connected with the electronic equipment in a wireless or wired mode.
In the embodiment of the application, the electronic equipment is controlled to shoot the image through the external controller, so that the electronic equipment is prevented from being directly touched, the electronic equipment is prevented from shaking, and the influence on the final result is avoided.
As shown in fig. 4, a schematic diagram of an actual application of the calibration system of the point spread function provided in the embodiment of the present application includes:
a device table;
a movable part arranged on the device platform;
an electronic device disposed on the movable portion;
a porous plate 41 provided on the apparatus table; wherein, at least two through holes are arranged on the porous plate 41;
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;
a control unit 42 for controlling the on/off of the at least two light emitting units, wherein the control unit 42 is connected with the light emitting units;
wherein, the movable part includes: a guide rail 43 fixed to the mounting table; a first adjusting bracket 44 slidably coupled to the guide rail 43; a second adjusting bracket 45 connected to the first adjusting bracket 44; the electronic device is arranged on the second adjusting bracket 45;
the light emitting section includes: an optical fiber coupling light emitting diode 48 on which an optical fiber holder is provided; one more-turn multimode optical fiber 49, the optical fiber at the input end of the one more-turn multimode optical fiber 49 can be inserted into the optical fiber holder of the optical fiber coupling light emitting diode 48. The through hole of the porous plate 41 is provided with an optical fiber holder, and the optical fiber at the output end of the multi-mode optical fiber 49 with one turn can be inserted into the optical fiber holder on the porous plate 41. Specifically, the output optical fibers include nine optical fibers, which are inserted into the through holes in the box shown in fig. 3. Its view in the yz direction is shown in fig. 5; the view in the xz direction is shown in fig. 6. Here, the z-axis direction is a normal direction of the focal plane of the mobile phone, and the xy plane is a plane where the focal plane of the mobile phone is located.
The electronic device includes a mobile phone 46 fixed on the second adjusting bracket 45 and a computer 47 connected to 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 make the porous plate 41 parallel to the screen of the mobile phone 46, the light-emitting unit in the central position in the porous plate 41 coincides with the center of the field of view when the mobile phone 46 shoots, 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 at the same time, which is not described herein 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 I0. Then the light-emitting unit is lightened to control the mobile phone 46 to continuously shoot a plurality of images IiWhere i is 1,2, …, N. The mobile phone 46 transmits the raw data of the captured image to the computer 47. Computer 47 calculates the following from the formula:
Figure BDA0002732185430000121
1,2, …, N; and calculating to obtain a calibration image I.
As shown in fig. 7, a schematic step diagram of a calibration method of a point spread function provided in the embodiment of the present application is shown, where the calibration method of a point spread function is applied to an electronic device in a calibration system of a point spread function in the embodiment of the present application, and the calibration method of a point spread function includes:
step 701, a first image and a second image are obtained through shooting.
In the step, a calibration system with a first image as a point spread function is positioned in a darkroom without a light source, and an electronic device shoots an obtained image; the calibration system with the second image as 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; 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 to obtain 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 the porous plate when the electronic equipment shoots to obtain a second image; .
Step 702, obtaining a calibration image through target operation.
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, eliminating the noise influence in the process of shooting the second image, and further obtaining a calibration image carrying point spread function information. Further, since the number of light sources in the second image is at least two, the obtained calibration image also has at least two light sources. Therefore, the calibrated image carries the information of the point spread functions at least two positions in the field of view of the electronic equipment, so that the calibrated point spread functions are more accurate; meanwhile, when the calibration image is used for image recovery, the recovery effect is better.
Optionally, when the number of the second images is at least two, obtaining the calibration image through 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 obtained by shooting, and mean value operation is performed after denoising is performed on each second image, 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 the point spread function provided in the embodiment of the present application, the execution subject may be a calibration device of the point spread function, or a control module in the calibration device of the point spread function, which is used for executing the calibration method of the point spread function. In the embodiment of the present application, a method for executing a point spread function calibration by a point spread function calibration device is taken as an example, and the point spread function calibration device provided in the embodiment of the present application is described.
As shown in fig. 8, an embodiment of the present application further provides a calibration apparatus for a point spread function, which is applied to an electronic device in the calibration system for a point spread function in the foregoing application embodiment, and the calibration apparatus for a point spread function includes:
a shooting module 801, configured to obtain a first image and a second image through shooting; the first image is an image obtained by shooting by electronic equipment when a calibration system with a point spread function is positioned in a darkroom without a light source; the calibration system with the second image as 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; 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 to obtain 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 the porous plate when the electronic equipment shoots to obtain a second image;
a generating module 802, configured to obtain a calibration image through target operation; the target operation comprises the step of 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 equipment.
Optionally, in a case that the number of the second images is at least two, the generating module 802 includes:
the first calculation unit is used for obtaining at least two target images through target operation aiming at each second image and each first image;
and the second calculating 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, eliminating the noise influence in the process of shooting the second image, and further obtaining a calibration image carrying point spread function information. Further, since the number of light sources in the second image is at least two, the obtained calibration image also has at least two light sources. Therefore, the calibrated image carries the information of the point spread functions at least two positions in the field of view of the electronic equipment, so that the calibrated point spread functions are more accurate; meanwhile, 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 present application may be a device, or may be a component, an integrated circuit, or a chip in a terminal. The device can be mobile electronic equipment or non-mobile electronic equipment. By way of example, the mobile electronic device may be a mobile phone, a tablet computer, a notebook computer, a palm top computer, a vehicle-mounted electronic device, a wearable device, an ultra-mobile personal computer (UMPC), a netbook or a Personal Digital Assistant (PDA), and the like, and the non-mobile electronic device may be a server, a Network Attached Storage (NAS), a Personal Computer (PC), a Television (TV), a teller machine or a self-service machine, and the like, and the embodiments of the present application are not particularly limited.
The calibration device of the point spread function in the embodiment of the present application may be a device having an operating system. The operating system may be an Android operating system (Android), an iOS operating system, or other possible operating systems, which is not specifically limited in the embodiments of the present application.
Optionally, as shown in fig. 9, an electronic device 900 is further provided in this embodiment of the present application, and includes a processor 901, a memory 902, and a program or an instruction stored in the memory 902 and executable on the processor 901, where the program or the instruction is executed by the processor 901 to implement each process of the above-mentioned calibration method for a point spread function, and can achieve the same technical effect, and in order to avoid repetition, it is not described here again.
It should be noted that the electronic devices in the embodiments of the present application include the mobile electronic device and the non-mobile electronic device described above.
Fig. 10 is a schematic diagram of a hardware structure of an electronic device implementing an embodiment of the present application.
The electronic device 1000 includes, but is not limited to: a radio frequency unit 1001, a network module 1002, an audio output unit 1003, an input unit 1004, a sensor 1005, a display unit 1006, a user input unit 1007, an interface unit 1008, a memory 1009, and a processor 1010.
Those skilled in the art will appreciate that the electronic device 1000 may further comprise a power source (e.g., a battery) for supplying power to various components, and the power source may be logically connected to the processor 1010 through a power management system, so as to implement functions of managing charging, discharging, and power consumption through 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 those shown, or combine some components, or arrange different components, and thus, the description is not repeated here.
A sensor 1005 for capturing a first image and a second image; the first image is an image obtained by shooting by electronic equipment when a calibration system with a point spread function is positioned in a darkroom without a light source; the calibration system with the second image as 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; 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 to obtain 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 the porous plate when the electronic equipment shoots to obtain a second image;
a processor 1010, configured to obtain a calibration image through target operation; the target operation comprises the step of 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 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, eliminating the noise influence in the process of shooting the second image, and further obtaining a calibration image carrying point spread function information. Further, since the number of light sources in the second image is at least two, the obtained calibration image also has at least two light sources. Therefore, the calibrated image carries the information of the point spread functions at least two positions in the field of view of the electronic equipment, so that the calibrated point spread functions are more accurate; meanwhile, when the calibration image is used for image recovery, the recovery effect is better.
Optionally, when the number of the second images is at least two, the processor 1010 is specifically configured to obtain at least two target images through target operation on each of the second images and the 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 obtained by shooting, and mean value operation is performed after denoising is performed on each second image, 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 Processing Unit (GPU) 10041 and a microphone 10042, and the Graphics Processing Unit 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 may include two parts, 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, and a joystick, which are not described in detail herein. The memory 1009 may be used to store software programs as well as various data, including but not limited to application programs and operating systems. Processor 1010 may integrate an application processor that handles primarily operating systems, user interfaces, applications, etc. and a modem processor that handles primarily wireless communications. It will be appreciated that the modem processor described above may not be integrated into processor 1010.
The embodiment of the present application further provides a readable storage medium, where a program or an instruction is stored on the readable storage medium, and when the program or the instruction is executed by a processor, the program or the instruction implements each process of the above-mentioned point spread function calibration method embodiment, and can achieve the same technical effect, and in order to avoid repetition, details are not repeated here.
The processor is the 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 (RAM), a magnetic disk or an optical disk, and so on.
The embodiment of the present application further provides a chip, where the chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is configured to run a program or an instruction to implement each process of the embodiment of the point spread function calibration method, and the same technical effect can be achieved, and in order to avoid repetition, details are not repeated here.
It should be understood that the chips mentioned in the embodiments of the present application may also be referred to as system-on-chip, system-on-chip or system-on-chip, 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 an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Further, it should be noted that the scope of the methods and apparatus of the embodiments of the present application is not limited to performing the functions in the order illustrated or discussed, but may include performing the functions in a substantially simultaneous manner or in a reverse order based on the functions involved, e.g., the methods described may be performed in an order different than that described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present application may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present application.
While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (12)

1. A system for calibrating a point spread function, the system comprising:
a device table;
a movable part arranged on the device platform;
an electronic device disposed on the movable portion;
a perforated plate disposed 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;
a control unit connected to the light emitting unit, the at least two light emitting units being in a lighting state when the control unit transmits a first signal to the light emitting unit; when the control unit transmits a second signal to the light emitting unit, the at least two light emitting units are in an off state;
the relative positions of the electronic equipment and the light-emitting unit are adjusted through the movable part;
the electronic equipment obtains a first image and a second image through shooting; the first image is an image obtained by shooting by the electronic equipment when the calibration system of the point spread function is in a darkroom without a light source; the second image is an image obtained by shooting the at least two light-emitting units by the electronic equipment, and the calibration system of the point spread function is positioned in a darkroom with the at least two light-emitting units in a lighting state; 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 obtains the second image through shooting is smaller than a preset threshold value; the target distance is the distance between a shooting unit of the electronic equipment and the porous plate when the electronic equipment shoots to obtain 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 the field of view of the electronic device.
2. The system for calibrating a point spread function according to claim 1, wherein in a case where the number of the second images is at least two, the electronic device obtains at least two target images through target operation for each of the second images and the first image; and obtaining the calibration image by averaging the at least two target images.
3. The system for calibrating a point spread function according to claim 1, wherein the movable portion comprises: a guide rail fixed to the mounting table;
a first adjusting bracket slidably connected to 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 platform adjust relative positions through the first adjusting bracket; the relative position of the electronic equipment and the device platform is adjusted through the second adjusting bracket.
4. The system for calibrating a point spread function according to claim 1, wherein the light emitting unit comprises: a light source unit and at least two of the light emitting units respectively connected to the light source unit;
wherein the light source unit is connected with the control unit; the light source unit is in a lighting state when the control unit transmits a first signal to the light emitting unit; the light emitted by the light source unit is transmitted to the through hole through the light emitting unit; when the control unit transmits a second signal to the light emitting unit, the light source unit is in an off state.
5. The system for calibrating a point spread function according to claim 4, wherein the light source unit comprises a light emitting diode; the light-emitting unit is an output end of a multi-mode optical fiber with more than one turn; the input end of the multi-mode optical fiber with one rotation number is connected with the light emitting diode, and each output end of the multi-mode optical fiber with one rotation number is fixed in different through holes.
6. The system for calibrating a point spread function according to claim 1, wherein the light emitting units are arranged in a shape of a Chinese character 'mi' 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 calibration method of a point spread function, applied to an electronic device in a calibration system of a point spread function according to any one of claims 1 to 7, the calibration method of a point spread function comprising:
shooting to obtain a first image and a second image; the first image is an image obtained by shooting by the electronic equipment when the calibration system of the point spread function is in a darkroom without a light source; the second image is an image obtained by shooting the at least two light-emitting units by the electronic equipment, wherein the calibration system of the point spread function is positioned in a darkroom with the at least two light-emitting units in a lighting state; 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 obtains the second image through shooting is smaller than a preset threshold value; the target distance is the distance between a shooting unit of the electronic equipment and the 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 the field of view of the electronic device.
9. The method for calibrating a point spread function according to claim 8, wherein in a case where the number of the second images is at least two, obtaining a calibration image through a target operation includes:
obtaining at least two target images through target operation aiming at each second image and the first image;
and obtaining the calibration image by averaging the at least two target images.
10. An apparatus 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 apparatus comprising:
the shooting module is used for shooting to obtain a first image and a second image; the first image is an image obtained by shooting by the electronic equipment when the calibration system of the point spread function is in a darkroom without a light source; the second image is an image obtained by shooting the at least two light-emitting units by the electronic equipment, wherein the calibration system of the point spread function is positioned in a darkroom with the at least two light-emitting units in a lighting state; 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 obtains the second image through shooting is smaller than a preset threshold value; the target distance is the distance between a shooting unit of the electronic equipment and the 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 the field of view of the electronic device.
11. The apparatus for calibrating a point spread function according to claim 10, wherein the generating module, in a case where the number of the second images is at least two, includes:
the first calculation unit is used for obtaining at least two target images through target operation aiming at each second image and the first image;
and the second calculating 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 instructions stored on the memory and executable on the processor, the program or instructions, when executed by the processor, implementing the steps of the method of calibration of a point spread function as claimed in claim 8 or 9.
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