CN108989790B - Real-time evaluation device for imaging quality of camera - Google Patents
Real-time evaluation device for imaging quality of camera Download PDFInfo
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- CN108989790B CN108989790B CN201810754383.XA CN201810754383A CN108989790B CN 108989790 B CN108989790 B CN 108989790B CN 201810754383 A CN201810754383 A CN 201810754383A CN 108989790 B CN108989790 B CN 108989790B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04N17/002—Diagnosis, testing or measuring for television systems or their details for television cameras
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Abstract
The patent discloses a camera imaging quality real-time evaluation device, the device includes: a case; a projection system comprising a lens assembly and a projection screen, the lens assembly comprising an eyepiece, a light supplementing hole and a projection mirror; a display system; the eye visually observes the aperture. By the device, the projection image and the camera imaging image are evaluated in real time. Through the technical scheme, the method can be used for real-time evaluation of imaging quality of a camera or an imaging system, one method can conveniently implement a visual information quality evaluation method, score the quality of the participated evaluation image, and evaluate the imaging quality of the imaging system; the two can implement real-time comparison of the digital image acquired by the imaging device and the photographed scene, and the imaging device can calibrate the imaging system to be close to the real scene continuously in real time according to the result of the field comparison.
Description
Technical Field
This patent belongs to the imaging device field, particularly relates to a camera imaging quality real-time evaluation device.
Background
Imaging devices have been widely used in the art, such as digital cameras, digital video cameras, and the like. Theoretically, an ideal state in which the imaging apparatus records information is to be faithfully reproducible to shooting scene information. In terms of image quality assessment, a person is the ultimate recipient of perception of image information, and how image quality is ultimately or is ultimately analyzed, identified, and understood by the person.
In the current evaluation of imaging quality of imaging equipment, the image acquisition and the image quality evaluation are independent two processes, a digital image for evaluation is firstly shot by an imaging system, then an evaluation system is established to complete the evaluation, and then the evaluation is fed back to the imaging system.
The evaluation is usually performed by displaying the photographed digital image on a color-managed display system, inviting a part of experienced image quality evaluation specialists as observers, scoring the effect of the displayed image according to a certain scoring rule for the effect of the displayed image, or organizing a part of inexperienced image observers, scoring the effect of the displayed image according to own preference, and then performing statistical analysis on the obtained score to obtain an average score or weighted average score of the visual quality of the image. This evaluation is performed independently after the departure from the original shooting scene, and it is difficult to compare whether or not the shooting scene is faithfully restored or copied to what extent because there is no opportunity to compare with the original shooting scene. The evaluation result thus obtained strongly depends on experience or preference of an evaluator, and if the imaging quality of the imaging apparatus is evaluated from the fidelity of the restoration of the photographed scene, the best evaluation is to compare the image recorded by the imaging apparatus with the photographed scene in real time, and directly evaluate the effect of the imaging apparatus to restore the real scene.
The existing image quality detection for the imaging equipment in the market mainly comprises a darkroom for professional detection or evaluation, wherein the walls, ceilings, floors and the like of the darkroom are neutral gray, and other objects are gray or achromatic. Such a darkroom has a high specification requirement for decoration and a high space requirement, and is inconvenient to evaluate due to the immovable nature of the house.
The defects of the prior art scheme mainly comprise the following five points: firstly, the evaluation process is carried out in a darkroom, the occupation area for constructing the darkroom is large, the decoration specification of the darkroom is high, and the control difficulty of the environmental parameters of the darkroom is high; secondly, the image evaluation process and the image acquisition process are separated and cannot be compared in real time; thirdly, the evaluation result is not based on the perception and knowledge of the original shooting scene by the evaluator, and is strongly dependent on experience or preference of the observer; fourth, the evaluation of imaging effect of the imaging system is limited to the acquisition of the setting scene in the darkroom, and the real-time comparison of the outdoor natural environment on-site information acquisition cannot be completed; fifth, objective evaluation and adjustment of imaging quality of the imaging device are mutually independent, and consistency of the imaging quality control parameter adjustment target of the imaging system with the on-site perception effect is difficult to achieve.
Disclosure of Invention
This patent is based on the above-mentioned demand of prior art and proposes, and the technical problem that this patent will solve is to provide a be used for camera imaging quality evaluation method to can be contrasted and carry out convenient and accurate evaluation to the camera imaging quality.
In order to solve the technical problem, the technical scheme that this patent provided includes:
the method adopts an image real-time evaluation device to compare the imaging quality of the camera in real time; the image real-time evaluation device comprises: the box body provides a closed environment when the imaging quality is evaluated, and external stray light is isolated; a projection system comprising a lens assembly and a projection screen, the lens assembly comprising an eyepiece, a light supplementing hole and a projection mirror; the ocular is opposite to the target object, and the image of the target object is collected and transmitted to the projection lens; the projection mirror projects an image of the target object onto a projection screen; the light supplementing hole is arranged between the ocular and the projection lens and supplements light to the light path inside the lens component; the projection screen is arranged in the box body and presents an image of the target object projected by the lens assembly; the display system is connected with the camera and displays images shot by the camera; the display system comprises a display screen, wherein the display screen is arranged in the box body; the human eye observation hole is arranged on the box body and is opposite to the projection screen and the display screen. The real-time comparison step is as follows: a) Placing a box body of the device in front of an imaging scene, fixing a camera module to be evaluated on a camera module fixing bracket configured by the device, and connecting a controller of the camera module with a display system so as to display an acquired image; b) According to the requirements of test items, the coordinates of six dimensions of the camera fixing support are adjusted, the optical axis of the camera is ensured to be perpendicular to the image plane of a shooting scene, and the object distance is adjusted to obtain the corresponding imaging size; c) Opening a projection system to enable shooting scene content to be projected on a projection screen in a box body, and adjusting an ocular lens and a projection lens to obtain a clear image as large as a display system; d) Measuring illuminance and color temperature of a shooting scene; e) Measuring the illuminance and the color temperature of the surface of the projection screen in the box body, comparing the illuminance and the color temperature value of the shot scene, and adjusting the size of the light supplementing hole to control the illuminance difference between the surface of the projection screen and the illuminance of the shot scene within 100 Lux; f) In the box body, correcting the coordinate tristimulus value of the white point of the display screen to be matched with the coordinate of the measured color temperature tristimulus value of the surface of the projection screen, and adjusting the brightness of the display screen to ensure that the brightness difference between the brightness of the display screen and the illuminance of the display system screen is controlled within 100 Lux; g) Fine-tuning the brightness of the projection system and the display screen to enable the image size of the display screen to be matched with the image size of the projection screen, and enabling the illuminance difference between the surface of the display screen and the surface of the projection screen to be within an allowable difference range; h) And focusing a shooting scene, acquiring a digital image, displaying the digital image on a display system, and evaluating the imaging quality of the camera by observing the images on the display screen and the projection screen.
Preferably, the method further comprises real-time correction of the display system and the camera, wherein the real-time correction can be completed in a laboratory darkroom, and can be used before the real-time evaluation or can be used for continuously evaluating the image by adjusting after one round of evaluation is finished during the real-time evaluation; the real-time correction includes the steps of: 1) Shooting each test item in a test scene; 2) Comparing the difference between the image displayed by the display system and the projection screen image, and determining an adjustment direction; 3) Recording and analyzing objective quality parameters of the current shooting project; 4) Adjusting the driving parameters of the imaging system by referencing the adjustment direction, so that the image quality index reflected by the parameters tends to be consistent with the adjustment direction; 5) And repeating the steps, and integrating the adjustment directions of all the items to adjust the driving parameters of the imaging system so as to enable the acquired image to approach the projection image.
Preferably, the illuminance in the box body is lower than 5Lux under the condition of no illumination; the color in the box body is neutral gray; the inner wall of the box body is matte and has no specular reflection and glare phenomena.
Preferably, the lens assembly further comprises a reflecting mirror, and the reflecting mirror is a plane mirror and mainly used for turning the incident light of the ocular lens by 90 degrees and reflecting the incident light to the projection mirror.
Preferably, the projection lens is a lens combination, and the focal length can be adjusted to realize the adjustment of the size and definition of the image projected on the projection screen.
Preferably, the light supplementing hole is arranged at the rear side of the ocular lens, and the size of the hole can be adjusted to control the light quantity; when the image projected by the projection system is darker, the aperture light entering amount is increased, and conversely, the aperture light entering amount is reduced.
Preferably, the observation hole is provided with a binocular observation lens, the lens is a group of lenses, and the visual observation distance can be adjusted within the adjustment range of 1-25 meters.
Preferably, a roller may be provided on the base of the case.
Preferably, the camera module fixing support further comprises: the bracket can fix the camera module and can adjust the position of the camera in three dimensions in space; the camera module fixing support is arranged on the outer surface of the front side of the box body and is close to the ocular lens of the projection system.
Preferably, the camera module fixing bracket is adjusted, so that the optical axis of the camera module is vertical to the imaging plane; the camera module is positioned on the same horizontal plane with the ocular of the projection system, and the distance between the centers of the camera module and the ocular is 5-10 mm; the control circuit board of the camera module is connected with the display system, and the digital image acquired by the camera is displayed through the display screen.
Preferably, a light measuring sensor is also arranged in the device box body, so that the illuminance of the surface of a display screen of the display system can be measured, the illuminance of the surface of a projection screen of the projection system can also be measured, and the brightness of the display screen or the light inlet quantity of the light supplementing hole can be adjusted through parameter feedback, so that the relative illuminance error of the two surfaces is within 10%.
Through the technical scheme, the method can be used for real-time evaluation of imaging quality of a camera or an imaging system, one method can conveniently implement a visual information quality evaluation method, score the quality of the image to be evaluated, and evaluate the imaging quality of the imaging system; the two can implement real-time comparison of the digital image acquired by the imaging device and the photographed scene, and the imaging device can calibrate the imaging system to be close to the real scene continuously in real time according to the result of the field comparison.
Drawings
Fig. 1 is a block diagram of an apparatus for real-time evaluation of imaging quality of a camera according to an embodiment of the present patent.
Fig. 2 is an internal structural diagram of an apparatus for real-time evaluation of imaging quality of a camera according to an embodiment of the present patent.
Detailed Description
The following detailed description of the present patent refers to the accompanying drawings, which are presented to illustrate the preferred embodiments of the present patent and not to limit the scope of the present patent.
In this embodiment, as shown in fig. 1, a device for real-time evaluation of imaging quality of a camera is provided. The device comprises a box body 1, wherein a closed environment is provided when the box body works, external stray light is isolated, the illuminance of the box body under the condition of no illumination is lower than 5Lux, the color in the box body is neutral gray, and the inner wall of the box body is matte and has no specular reflection and dazzling phenomena.
The box body is designed to form a closed space in a small range, so that the unplanned interference of ambient light can be avoided as much as possible, and a proper environment is provided for the evaluation of imaging quality. The matte inner wall of the box body is used for avoiding interference caused by reflection of the side wall of the box body during subsequent light-emitting imaging such as projection.
As shown in fig. 1, preferably, a roller 2 may be provided on the base of the box, and the roller may be a common wheel or a universal wheel, so that the box can be flexibly moved to a suitable position, so as to facilitate docking with other devices, transportation and movement of the box. Great flexibility is brought to the use.
As shown in fig. 2, a display device 3 is provided on one side of the bottom surface of the case, and is used for displaying the image of the camera, where the display device may be a display device in the prior art, for example, including but not limited to a display device including an LED display or other display screen. The display device 3 can adjust the brightness, contrast, white point, screen resolution, refresh frequency of the display screen according to the settings, and can be connected with a screen color measuring device (such as an X-Rite series spectrophotometer, etc.) to complete color correction of the screen.
The other side of the bottom surface of the box body is provided with a projection screen 4, the projection screen is used for receiving the projection of the optical projection system, an image is formed on the projection screen, the projection screen is an image information receiving screen and receives the projection light of the projection lens, the screen is a diffuse reflector and has no glare, the screen is white, the color of the projection screen can be in chromaticity matching with the white point of the display device, and thus the display system and the projection system can be ensured to be under approximate optical environment as much as possible, and the image displayed by the display system and the image projected by the projection system can be conveniently compared. Further, the surface of the projection screen is in the same level with the surface of the display screen of the display system, so that the difference of visual effects caused by different drop heights is avoided. And the projection screen is positioned as close as possible to the display screen so that the images formed by the two are as close as possible for ease of viewing and alignment.
The projection system further comprises: the lens assembly comprises an ocular 5, a light supplementing hole 6, a reflecting mirror 7 and a projection lens 8; the eyepiece is a lens combination, can adjust the focal length, and is used for acquiring the image information with the same angle of view as a camera or an imaging system; the light supplementing hole is arranged at the rear side of the ocular, the size of the hole can be adjusted to control the light inlet quantity, when the image projected by the projection system is darker, the light inlet quantity of the opening can be increased, and conversely, the light inlet quantity of the opening can be reduced; the reflector is a plane mirror and mainly used for turning the incident light of the ocular lens by 90 degrees and reflecting the incident light to the projection mirror; the projection lens is a lens combination, which can adjust the focal length, realize the size and definition adjustment of the projected image, and project the reflected light on the projection screen. The lens assembly is similar to a camera lens or a telescope or a periscope, and is used for framing a target object or an original manuscript actually, then the light from the target object is projected onto the projection screen through the lens assembly, the light supplementing hole is used for compensating the loss of light quantity in the refraction and reflection processes of the lens assembly, and the image projected by the projection system is consistent with the light of the target object as much as possible through supplementing the light. The eyepiece is arranged on the box, preferably on the front side of the box, and close to the camera, so that the angle and other conditions of view finding of the eyepiece and the camera are kept as the same as possible, and the images which are as same as possible in theory are obtained.
The device also comprises a camera module fixing bracket 9: the bracket can fix the camera module 10 and can adjust the position of the camera in the space 6 dimension, namely fine adjustment in the three axes (XYZ) direction of space and fine adjustment in the three angles (elevation angle, depression angle and rotation) direction of space. The structure of the camera support can be realized by adopting a camera support in the prior art, and the camera support is not expanded in detail in the patent, so long as the camera support can be fixed on any structure capable of adjusting the position of the camera. The camera module fixing support is adjusted to achieve that the optical axis of the camera module is perpendicular to an imaging plane; the position of the camera module is in the same horizontal plane with the ocular part of the projection system, and the distance between the center of the lens is 5-10 mm; the control circuit board of the camera module is connected with the display system, and the acquired digital image can be displayed through the display screen. Preferably, as shown in fig. 1, the camera module fixing bracket is disposed on the front outer surface of the case, and the eyepiece of the projection system is also disposed on the front outer surface of the case, and the two are disposed as close as possible. The box can be aligned with the object to be photographed and projected for evaluation and testing.
The device further comprises a human eye viewing aperture 11, preferably arranged in the upper part of the housing opposite the projection screen and the display screen. The observation hole is provided with a binocular observation lens, the lens is a group of lens groups, the visual observation distance can be adjusted, and the adjustment range is 1-25 meters. As shown in fig. 1, the eye viewing holes may include a left eye viewing hole and a right eye viewing hole, so that only the left eye and the right eye are in light communication with the outside, and the rest is closed, thereby avoiding the influence of ambient light on the inside of the case. Furthermore, the range of the binocular viewing lens is set such that both the left and right eyes can simultaneously view images presented on the display system and/or the projection system. Thus, the image can be observed through two eyes, and the image is more close to the actual matching state. When the left eye and the right eye can only see one image at the same time, the binocular viewing lens can adjust the viewing distance and the area of the field of view so as to facilitate the comparison of the two images.
The device box is also internally provided with a light measuring sensor, which can measure the illuminance of the surface of a display screen of the display system and the surface of a projection screen of the projection system, and the brightness of the display screen or the light inlet quantity of the light supplementing hole is adjusted through parameter feedback, so that the relative illuminance error of the two surfaces is within 10 percent.
In this embodiment, besides the above system, a method for comparing images in real time by using the above device is provided, and in the use process of the device, the steps of the method for comparing images in real time are as follows:
a) Placing the device box in front of an imaging scene, fixing a camera module to be evaluated on a camera module fixing bracket configured by the device, and connecting a controller of the camera module with a display system so as to display an acquired image;
b) According to the requirements of test items, such as a definition test item, a color reduction test item, a noise test item and the like in IEEE Std 1858, the coordinates of six dimensions of the camera fixing support are adjusted, the optical axis of the camera is ensured to be vertical to the image plane of a shooting scene, and the object distance is adjusted to obtain the corresponding imaging size;
c) Opening a projection system to enable shooting scene content to be projected on a projection screen in a box body, and adjusting an ocular lens and a projection lens to obtain a large and clear image equal to that of a display system;
d) Measuring illuminance and color temperature of a photographed scene, such as using an illuminance measuring instrument;
e) Measuring the illuminance and the color temperature of the surface of the projection screen in the box body, comparing the illuminance and the color temperature value of the shot scene, and adjusting the size of the light supplementing hole to control the illuminance difference between the surface of the projection screen and the illuminance of the shot scene within 100 Lux;
f) In the box body, carrying out color management on the display system, carrying out color correction on the display system by means of a spectrophotometer and color management software, correcting that the coordinate tristimulus value of the white point of the display system is matched with the coordinate of the measured color temperature tristimulus value of the surface of the projection screen, and adjusting the brightness of the screen of the display system to control the difference between the illuminance of the screen of the display system and the illuminance of the surface of the projection screen to be within 100 Lux;
g) Fine-tuning the brightness of the projection system and the display screen to enable the image size of the display screen to be matched with the image size of the projection screen, and enabling the illuminance difference between the surface of the display screen and the surface of the projection screen to be within an allowable difference range; in this step, fine tuning the brightness of the projection system and the display system screen can further accurately adjust the image display size and display brightness of both systems. This allows the two systems to be brought as close together as possible.
h) And focusing a shooting scene, acquiring a digital image, displaying the digital image on a display system, and evaluating the imaging quality of the camera by observing the images on the display screen and the projection screen.
The evaluation may be performed by a pair-wise comparison method, including but not limited to, the test standard deduced by the international telecommunication union telecommunication standardization sector (ITU), comparing the difference between the display image of the display system and the projection image of the projection system, and classifying the score of the test object to be evaluated into 7 grades by using a comparison scoring system: very bad, somewhat bad, the same as both, somewhat good, very good; for the score processing of the evaluation, the average score can be used for representing the image quality, and the confidence interval of the average score can be calculated.
In this embodiment, in addition to the real-time comparison using the above device, the display system may be corrected in real time, where the real-time correction may be performed in a laboratory darkroom, and may be used before the real-time evaluation, or may be used to continuously evaluate the image by adjusting after the end of one round of evaluation during the real-time evaluation. One point of the real-time comparison is that it is different from the real-time comparison is that parameter calculation reflecting objective imaging quality of the imaging system needs to be completed. Image quality analysis software, such as imaatest, etc., needs to be installed in the display system before evaluation. The implementation process is described as follows:
1) The experiment executor shoots test scenes such as ISO 12233 definition test card, ISO 14524 noise test card, test items recommended by the I EEE 1858 test standard and the like;
2) The experiment executor compares the difference between the image displayed by the display system and the projection screen image, determines the adjustment direction, such as a definition test item, and can judge the relative high or low definition;
3) Analyzing objective quality parameters of the current shooting project and recording;
4) Adjusting driving parameters of the imaging system according to the judgment of perception, so that image quality indexes reflected by the parameters tend to be consistent with the perception direction;
5) And repeating the steps, integrating the perception directions of all the items to be measured, and adjusting the driving parameters of the imaging system to enable the acquired image to better approach to the projection image of the device.
The device in the specific embodiment has the important performance characteristic that the real-time comparison of the images obtained by the camera module on site and the contents of the shooting site can be realized. The device can be used for comparing the standard test card for objective quality analysis in real time in a dark room or comparing the imaging effect of a natural scene in real time outdoors. And in the prior art, the display effect can only be compared with the actual shooting object in the dark room, and the image displayed by shooting can be compared with the real object image in an adjacent mode by projecting the actual shooting object onto the screen of the projection system, so that the influence of external environment is avoided, and the flexibility is greatly improved. The method not only can be used for detecting a darkroom, but also can be used for evaluating outdoors and the like, and has larger flexibility and application range.
The mobile detection environment is realized by adopting the comparison and correction method of the device, and a standardized observation environment can be provided. The real-time comparison of the shot image and the based real scene can be realized. Visual information quality assessment can be performed, and not only can contrast of static objects be achieved, but also can be used for video image quality assessment alone, and the visual information quality assessment is similar to the existing assessment system in this point. The device can be used in a darkroom and is matched with a standard test card or a test device for objective image quality detection to realize real-time comparison and real-time adjustment of a shot image and an imaging site, so that the adjustment direction of driving parameters of an imaging system is clear and continuously tends to be consistent with the visual perception direction, such as the adjustment direction of clear definition indexes, the adjustment direction of color reduction indexes, the adjustment direction of noise indexes, the adjustment direction of dynamic range indexes, the adjustment direction of distortion indexes and the like. The device can also be used for evaluating the imaging quality of outdoor natural scenes, which cannot be realized by the existing evaluation scheme; the existing evaluation scheme is carried out after the image is acquired, and the evaluation result is basically irrelevant to scene shot on site; the device can realize real-time paired comparison of the field imaging result and the field scene projection, and the evaluation result is based on the field scene; this is the biggest innovation point of this patent, is also the most valuable application of this patent design device.
The above is only a preferred technical solution of the present patent, and all modifications, substitutions and deletions made in the present patent under the conception of the present patent are included in the scope of protection of the present patent.
Claims (8)
1. A camera imaging quality real-time evaluation device, the device comprising:
the box body provides a closed environment when the imaging quality is evaluated, and external stray light is isolated; a projection system comprising a lens assembly and a projection screen, the lens assembly comprising an eyepiece, a light supplementing hole and a projection mirror; the ocular is opposite to the target object, and the image of the target object is collected and transmitted to the projection lens; the projection mirror projects an image of the target object onto a projection screen; the light supplementing hole is arranged between the ocular and the projection lens and supplements light to the light path inside the lens component; the projection screen is arranged in the box body and presents an image of the target object projected by the lens assembly; the display system is connected with the camera and displays images shot by the camera; the display system comprises a display screen, wherein the display screen is arranged in the box body; the human eye observation hole is arranged on the box body and is opposite to the projection screen and the display screen; the lens assembly further comprises a reflecting mirror, wherein the reflecting mirror is a plane mirror, and the incident light of the ocular lens is turned by 90 degrees and reflected to the projection mirror.
2. The real-time camera imaging quality evaluation device according to claim 1, wherein the projection lens is a lens combination capable of adjusting a focal length to achieve adjustment of the size and definition of an image projected on a projection screen.
3. The device for evaluating imaging quality of camera according to claim 2, wherein,
the light supplementing hole is arranged at the rear side of the ocular lens, and the size of the hole can be adjusted to control the light inlet quantity; when the image projected by the projection system is darker, the aperture light entering amount is increased, and conversely, the aperture light entering amount is reduced.
4. A camera imaging quality real-time evaluation device according to claim 3, wherein the observation hole is provided with a binocular observation lens, the lens is a group of lenses, and the visual observation distance can be adjusted within the adjustment range of 1-25 meters.
5. The device for evaluating imaging quality of a camera according to claim 4, wherein a roller is provided on a base of the housing.
6. The real-time camera imaging quality evaluation device according to claim 5, further comprising a camera module fixing bracket; the camera is fixed on the bracket, and the position of the camera can be adjusted in three dimensions in space; the camera module fixing support is arranged on the outer surface of the front side of the box body and is close to the ocular lens of the projection system.
7. The real-time imaging quality evaluation device of claim 6, wherein the camera module fixing bracket is adjusted to enable an optical axis of the camera module to be perpendicular to an imaging plane; the camera module is positioned on the same horizontal plane with the ocular of the projection system, and the distance between the centers of the camera module and the ocular is 5-10 mm;
the control circuit board of the camera module is connected with the display system, and the digital image acquired by the camera is displayed through the display screen.
8. The device for evaluating the imaging quality of the camera in real time according to claim 7, wherein a light measuring sensor is further arranged in the box body of the device, the illuminance of the surface of the display screen of the display system is measured, the illuminance of the surface of the projection screen of the projection system is also measured, and the brightness of the display screen is adjusted or the light inlet quantity of the light supplementing hole is adjusted through parameter feedback, so that the relative illuminance error of the two surfaces is within 10%.
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