CN104122078A - Evaluation method for image quality of near-to-eye display optical lens - Google Patents
Evaluation method for image quality of near-to-eye display optical lens Download PDFInfo
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Abstract
The invention discloses an evaluation method for image quality of a near-to-eye display optical lens. The evaluation method for the image quality of the near-to-eye display optical lens is suitable for the fast detection in commercialized production. The evaluation method for the image quality of the near-to-eye display optical lens includes that letting an experimenter observe a sample lens with performance parameters, extracting the group of physical parameters relatively sensitive to the visual perception of a human eye through a counting mode, quantizing the group of physical parameters to obtain a parameter interval corresponding to an image quality capable of being received by the human eye, and using the parameter interval as a subjective evaluation standard. The evaluation method for the image quality of the near-to-eye display optical lens uses a suit of evaluation devices for the image quality of the near-to-eye display optical lens to quickly detect the optical lens to be measured to obtain the physical parameter quantized values and compare the results with objective measured values to build a relationship between the subjective and objective. A quick detection system which has built the relationship can precisely and quickly evaluate the image quality of the optical system according to the detected lens parameters and subjective evaluation standard. By means of the technical scheme, the evaluation method for the image quality of the near-to-eye display optical lens is capable of quickly and precisely evaluating the imaging quality or performance of the optical lens, and the method is very convenient to use.
Description
Technical field
The present invention relates to the technical fields such as nearly eye demonstration, optical lens detection and image quality evaluation, relate in particular to a kind of evaluation method of nearly eye display optical camera lens picture element.
Background technology
In the last few years, along with the development of micro-display, advanced optics and software and hardware technology, nearly eye showed that product emerged in an endless stream, and it is also more extensive in the application in the field such as amusement, virtual reality.Display effect and the optical lens of device are closely related, are therefore very crucial for the image quality evaluation of optical lens.
Although for the design of near-to-eye part and the existing deep research of application, relatively lagging behind aspect its picture element detecting and assessing method.Though have some objective detection or subjective evaluation method existing, the former complicated operation, cannot fast detecting, and not in conjunction with the visual experience of human eye; Although subjective assessment is intuitively accurate, high to evaluating environmental requirement, and using subjective experience as evaluation criterion, therefore both cannot be applied in the detection in commodity production.
Summary of the invention
In order to solve above-mentioned shortcoming, the invention provides a kind of method of evaluating nearly eye display optical camera lens picture element, adopting said method can be evaluated the image quality of optical lens or the quality of its performance fast and accurately.
The technical solution adopted in the present invention is: a kind of evaluation method of nearly eye display optical camera lens picture element, comprising:
By various objective measurement instruments, optical lens to be evaluated is measured, obtained objective physical parameter value;
Obtain the physical parameter value corresponding to different brackets picture element of described optical lens to be evaluated; The physical parameter value that described different brackets picture element is corresponding is that subjective assessment counts; And extract the physical parameter value that the subjective feeling of human eye vision is had the greatest impact from physical parameter value corresponding to described different brackets picture element; Extracted described physical parameter value is quantized, obtain between parameter region corresponding to picture element that human eye accepts, as the physical parameter value of subjective assessment;
The evaluating apparatus of nearly eye display optical system picture element detects the physical parameter value that obtains detection to described optical lens to be evaluated;
The evaluating apparatus of described near eye display optical system picture element is set up the corresponding relation between physical parameter value and the described objective physical parameter value of described detection;
The evaluation criterion of the evaluating apparatus of described near eye display optical system picture element using the physical parameter value of described subjective assessment as input, according to the physical parameter value detecting described in optical lens to be measured and described corresponding relation, the physical parameter value of described detection is evaluated.
In method as above, the evaluating apparatus of described near eye display optical system picture element comprises: for micro-display screen (1) of display standard test board, optical lens (2) to be evaluated, for a CCD camera of imaging, gather the image pick-up card (5) of image, for showing and the computing machine (6) of analyzing and processing image; A described CCD camera comprises camera lens (3) and target surface (4);
The evaluating apparatus of described nearly eye display optical system picture element contrasts the physical parameter value of described detection and described objective physical parameter value and revise, and sets up relation between the two, specifically comprises:
Described computing machine contrasts the physical parameter value of described detection and described objective physical parameter value and revise, and taking the latter as the algorithm according to repeatedly debugging described computing machine employing, make the physical parameter value of described detection be tending towards approaching described objective physical parameter value, and obtain relation between the two.
In method as above, the evaluating apparatus of nearly eye display optical system picture element detects the physical parameter value that obtains detection to described optical lens to be evaluated, specifically comprise:
Described micro-display screen (1) shows the standard test panel of manufacturing, outgoing directional light after described optical lens to be evaluated (2), after a described CCD camera picked-up, described image pick-up card (5) gathers image and is finally presented on described computing machine (6) again; By the software algorithm on described computing machine (6), gathered image is carried out to Treatment Analysis, obtain the physical parameter value of described detection.
In method as above, described, extracted described physical parameter value is quantized, obtain between parameter region corresponding to picture element that human eye accepts, after physical parameter value as subjective assessment, the evaluating apparatus of described nearly eye display optical system picture element also comprises before described optical lens to be evaluated is detected to the physical parameter value that obtains detecting:
Described camera lens (3) to a described CCD camera and described target surface (4), described micro-display screen (1) are calibrated processing, the performance of only having described optical lens to be evaluated (2) that obtained physical parameter is expressed.
In method as above, set up the corresponding relation between physical parameter value and the described objective physical parameter value of described detection, specifically comprise: the physical parameter value of described detection and described objective physical parameter value are contrasted and revised, using the latter's parameter value as standard and judgment, the evaluating apparatus of the described nearly eye display optical system picture element of debugging is to change the physical parameter value of described detection, make the physical parameter value of the described detection of the evaluating apparatus detection of described nearly eye display optical system picture element approach described objective physical parameter value, and set up described corresponding relation.
In method as above, described performance parameter comprises at least one in field angle, distortion, resolution, contrast, mtf value and color saturation.
Compared with prior art, the invention has the advantages that: by adopting technique scheme, not only combine the subjective feeling of human eye but also set up contact with objective measurement, therefore the final result of evaluating accurately and reliably, the most important thing is that the result of evaluating out with the visual experience of human eye is consistent.And the standard testing version imaging that technical scheme of the present invention manifests according to micro-display once can be measured one or more physical quantitys such as field angle, distortion, resolution, contrast, MTF, color saturation, reaches the effect of fast detecting.And technical scheme of the present invention is high to evaluating environmental requirement, and using subjective experience as evaluation criterion, can be applied in the detection in commodity production, and can evaluate fast and accurately the image quality of optical lens or the quality of its performance, very easy to use.
Brief description of the drawings:
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
The process flow diagram of the evaluation method of the near eye display optical camera lens picture element that Fig. 1 provides for the embodiment of the present invention.
The schematic diagram of the evaluating apparatus of the near eye display optical system picture element that Fig. 2 provides for the embodiment of the present invention.
Fig. 3 measures on the axle of optical lens to be evaluated and the test mode figure of axle external characteristics in the embodiment of the present invention.
The instrumentation plan of the mtf value that Fig. 4 provides for the embodiment of the present invention.
The instrumentation plan of the distortion that Fig. 5 provides for the embodiment of the present invention.
The instrumentation plan of the field angle that Fig. 6 provides for the embodiment of the present invention.
Embodiment:
For making object, technical scheme and the advantage of the embodiment of the present invention clearer, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
The process flow diagram of the evaluation method of the near eye display optical camera lens picture element that Fig. 1 provides for the embodiment of the present invention.As shown in Figure 1, the evaluation method of the nearly eye display optical camera lens picture element of the present embodiment, specifically can comprise the steps:
100, by various objective measurement instruments, optical lens to be evaluated is measured, obtained objective physical parameter value;
For example, the performance parameter in the present embodiment comprises field angle, distortion, resolution, contrast, modulation transfer function (Modulation Transfer Function; MTF) at least one in value and color saturation.Particularly, obtain each performance parameter by various objective measurement apparatus measures optical lens to be evaluated, as obtained mtf value by transfer function measuring instruments, measure the physical parameter such as field angle, distortion by precision goniometer, all markd performance parameter values of each optical lens to be evaluated.
101, obtain the physical parameter value corresponding to different brackets picture element of optical lens to be evaluated; And extract the physical parameter value that the subjective feeling of human eye vision is had the greatest impact from physical parameter value corresponding to different brackets picture element; Extracted physical parameter value is quantized, obtain between parameter region corresponding to picture element that human eye accepts, as the physical parameter value of subjective assessment;
In the present embodiment, the physical parameter value that different brackets picture element is corresponding is that subjective assessment counts; For example optical lens to be evaluated can be put into market or structure observation person carries out subjective assessment, thereby count the physical parameter value that different brackets picture element is corresponding.
102, the evaluating apparatus of nearly eye display optical system picture element detects the physical parameter value that obtains detection to optical lens to be evaluated;
The evaluating apparatus of the nearly eye of the present embodiment display optical system picture element adopts various optical elements and computing machine etc. to form.
103, the evaluating apparatus of nearly eye display optical system picture element is set up the corresponding relation between physical parameter value and the objective physical parameter value detecting;
For example can set up the physical parameter value of detection and the objective corresponding relation between physical parameter value by the computing machine in the evaluating apparatus of near eye display optical system picture element.
104, the evaluating apparatus of nearly eye display optical system picture element is using the physical parameter value of subjective assessment as the evaluation criterion of inputting, and the physical parameter value and the corresponding relation that detect according to optical lens to be measured, evaluate the physical parameter value detecting.
The evaluation method of the nearly eye display optical camera lens picture element of the present embodiment, by adopting technique scheme, not only combine the subjective feeling of human eye but also set up contact with objective measurement, therefore the final result of evaluating accurately and reliably, the most important thing is that the result of evaluating out with the visual experience of human eye is consistent.And the standard testing version imaging that technical scheme of the present invention manifests according to micro-display once can be measured one or more physical quantitys such as field angle, distortion, resolution, contrast, MTF, color saturation, reaches the effect of fast detecting.And technical scheme of the present invention is high to evaluating environmental requirement, and using subjective experience as evaluation criterion, can be applied in the detection in commodity production, and can evaluate fast and accurately the image quality of optical lens or the quality of its performance, very easy to use.
The schematic diagram of the evaluating apparatus of the near eye display optical system picture element that Fig. 2 provides for the embodiment of the present invention.As shown in Figure 2, the evaluating apparatus of the near eye display optical system picture element of the present embodiment comprises: for micro-display screen 1 of display standard test board, optical lens 2 to be evaluated, for a CCD camera of imaging, gather the image pick-up card 5 of image, for showing and the computing machine 6 of analyzing and processing image; The one CCD camera comprises camera lens 3 and target surface 4.
Wherein micro-display screen 1 shows the standard test panel of manufacturing, outgoing directional light after optical lens to be evaluated 2, then after a CCD camera picked-up, image pick-up card 5 gathers image and is finally presented on computing machine 6.
Further alternatively, on the basis of the technical scheme of above-described embodiment, " evaluating apparatus of nearly eye display optical system picture element contrasts the physical parameter value of detection and objective physical parameter value and revise step 103 in above-described embodiment, set up relation between the two ", specifically can comprise: computing machine contrasts the physical parameter value of detection and objective physical parameter value and revise, and taking the latter as the algorithm according to debugging computer adopts repeatedly, make the physical parameter value detecting be tending towards approaching objective physical parameter value, and obtain relation between the two.
For example computing machine can be provided with software, can realize above-mentioned functions by software.
Further alternatively, on the basis of the technical scheme of above-described embodiment, step 102 in above-described embodiment " evaluating apparatus of nearly eye display optical system picture element detects and obtains the physical parameter value that detects optical lens to be evaluated; specifically comprise: micro-display screen 1 shows the standard test panel of manufacturing; outgoing directional light after optical lens to be evaluated 2; after a CCD camera absorbs, image pick-up card 5 gathers image and is finally presented on computing machine 6 again; By the software algorithm on computing machine 6, gathered image is carried out to Treatment Analysis, obtain the physical parameter value detecting.
Further alternatively, on the basis of the technical scheme of above-described embodiment, wherein " extracted physical parameter value is quantized in step 101, obtain between parameter region corresponding to picture element that human eye accepts, as the physical parameter value of subjective assessment " afterwards, step 102 " nearly eye display optical system picture element evaluating apparatus to optical lens to be evaluated detects obtain detection physical parameter value " before, the evaluation method of the present embodiment can also comprise: the camera lens 3 to a CCD camera and target surface 4, micro-display screen 1 is calibrated processing, the performance of only having optical lens to be evaluated 2 that obtained physical parameter is expressed.When calibration is processed, need use standard lens, the machining precision of this standard lens is high, and error is little, and it is fine that the parameter request when designed meets.
Further alternatively, on the basis of the technical scheme of above-described embodiment, step 103 in above-described embodiment " evaluating apparatus of nearly eye display optical system picture element set up the physical parameter value that detects and objectively the corresponding relation between physical parameter value ", specifically can comprise: the evaluating apparatus of nearly eye display optical system picture element contrasts the physical parameter value of detection and objective physical parameter value and revise, using the latter's parameter value as standard and judgment, the evaluating apparatus of the nearly eye of debugging display optical system picture element is to change the physical parameter value detecting, make the physical parameter value of the detection of the evaluating apparatus detection of nearly eye display optical system picture element approach objective physical parameter value, and set up corresponding relation.
Computing machine in the evaluating apparatus of the nearly eye display optical system picture element of above-described embodiment will have the standard of subjective assessment, treating photometry system by this device detects, obtain expressing one group of parameter value of its performance, and then the picture element that computing machine is treated photometry system according to evaluation criterion carries out fast and evaluation accurately.
Further alternatively, in the evaluating apparatus of the nearly eye display optical system picture element in above-described embodiment, micro-display screen 1 is arranged on optical lens to be evaluated 2, optical lens 2 to be evaluated is positioned on two-dimentional prism fixed station, the camera lens 3 of the one CCD camera is placed on the emergent pupil place of optical lens to be evaluated 2, by image formation by rays in the target surface 4 of a CCD camera.
Further alternatively, in the evaluating apparatus of the nearly eye display optical system picture element in above-described embodiment, the algorithm software that demonstration and Treatment Analysis image are installed on computing machine 6, just can once obtain expressing multiple physical parameter value of optical lens by Treatment Analysis software analysis image.Computing machine 6 will have the standard of subjective assessment, treating photometry system by the evaluating apparatus of this nearly eye display optical system picture element detects, obtain expressing one group of parameter value of its performance, and then the picture element that computing machine is treated photometry system according to evaluation criterion carries out fast and evaluation accurately.
Further alternatively, in the evaluating apparatus of the nearly eye display optical system picture element in above-described embodiment, micro-display screen 1, optical lens 2 to be evaluated, the camera lens 3 of a CCD camera are placed on guide rail by stent support, under the support of the camera lens 3 of the one CCD camera, be connected with D translation platform or corner platform, can move by manual or step motor control the measurement effect having reached all around.
Further alternatively, in the evaluating apparatus of the near eye display optical system picture element in above-described embodiment, micro-display screen 1 can irradiate the mask plate that is carved with testing standard version pattern by light source and replace.
Further alternatively, in the evaluating apparatus of the near eye display optical system picture element in above-described embodiment, while measuring on the axle of optical lens to be evaluated 2 characteristic, all devices all need be on same guide rail straight line; If measure axle external characteristics, need to utilize translation stage 9 or rotation angle disk 9, optical lens to be evaluated 2 is positioned over to the rotation angle disk center of circle, the 2nd CCD camera 10 is positioned over the distance of exit pupil place of optical lens to be evaluated 2, regulates the 2nd CCD camera 10 axis and optical lens 2 axis angles to be evaluated to angle θ.
Fig. 3 measures on the axle of optical lens to be evaluated and the test mode figure of axle external characteristics in the embodiment of the present invention.As shown in Figure 3, while measuring on the axle of optical lens to be evaluated 2 characteristic, all devices all need be on same guide rail straight line; If measure its axle external characteristics, need to utilize translation stage or rotation angle disk 9.Optical lens to be evaluated 2 is positioned over to rotation angle disk 9 centers of circle, and the 2nd CCD camera 10 is positioned over distance of exit pupil place, and the axis angle that regulates camera axis and optical lens 2 to be evaluated can be realized detection to angle θ.
Because the standard test panel that in the present embodiment, the micro-display screen 1 for display standard test board shows is to have comprised the pattern that can measure multiple parameters, and measure between different parameters process and do not interfere with each other, so this device can detect and obtain parameter result multiple parameters at one time, shorten the object that reaches Fast Evaluation detection time.
The measuring principle of each different physical value is simply described below.
For the measurement of mtf value, the instrumentation plan of the mtf value providing for the embodiment of the present invention as Fig. 4, as shown in the two width figure of Fig. 4 left and right, black and white strip contrast before and after imaging can change to some extent, the striped situation of change of different frequency is different, and the gray-scale value of gray-scale map is proportional to light intensity value.By analyzing the distribution situation of gray-scale value, according to
be calculated to be the ratio of the contrast that looks like front and back black and white strip, can obtain must mtf value, wherein M' under this frequency v
imgrepresent the contrast of striped picture, M
objrepresent the contrast of thing.Obtain under some frequency after mtf value, just can analyze the performance of contrast and resolution, such as in the time that frequency is 10lp/mm, can find out the performance of contrast; It in the time that frequency is 30lp/mm, is the performance of resolution.Certainly mtf value is larger, and the performance of contrast or resolution is better.
For the measurement of distortion, the instrumentation plan of the distortion providing for the embodiment of the present invention as Fig. 5.As shown in Figure 5, the image before distortion is middle square chart, as shown in Figure 5, after distortion, is the pincushion figure in outside.Obtain Δ L and L by Algorithm Analysis, wherein Δ L represents amount of distortion, and L represents the size before distortion, can be according to formula
try to achieve distortion size.
For the measurement of field angle, the instrumentation plan of the field angle providing for the embodiment of the present invention as Fig. 6.As shown in Figure 6, with the one CCD camera observe waffle slab as shown in the figure, then according to formula
wherein f is the focal length of the camera lens of a CCD camera, and h is the height of imaging on the s target surface of a CCD camera, calculates the size of field angle θ.
For the measurement of color rendition degree, the measurement of color rendition degree need to be used 24 colour standard colorimetric cards, and principle is that each color has corresponding rgb value, and the rgb value of colorimetric card every kind of color before and after imaging all changes to some extent.Can quantize color rendition degree according to the special algorithm of reduction degree, before and after imaging, rgb value deviation is less, and the color rendition degree of optical system is better.
Specific algorithm and principle during according to every kind of parameter measurement, can detect the parameter size of optical system.But affect because image quality is also subject to camera lens and the target surface etc. of micro-display screen, a CCD camera, also need them to demarcate processing.When calibration, need use standard lens, to measure the affect size of other devices on parameters.Owing to being independently between each device, they can be regarded as to cascade system processing.
Obtain after each parameter of camera lens to be measured, then the standard value measuring with standard measuring instruments is in conjunction with comparing, by repeatedly debugging the algorithm of fast checking device computer software, makes measured value value of being near the mark that fast check system obtains as far as possible or be certain funtcional relationship.
According to above-mentioned embodiment, just set up contacting between subjective assessment and objective measurement by fast check system.So just check system detects each parameter value size soon, and then evaluates according to evaluation criterion.
Finally it should be noted that: above embodiment only, in order to technical scheme of the present invention to be described, is not intended to limit; Although the present invention is had been described in detail with reference to previous embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or part technical characterictic is wherein equal to replacement; And these amendments or replacement do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (6)
1. an evaluation method for nearly eye display optical camera lens picture element, is characterized in that, comprising:
By various objective measurement instruments, optical lens to be evaluated is measured, obtained objective physical parameter value;
Obtain the physical parameter value corresponding to different brackets picture element of described optical lens to be evaluated; The physical parameter value that described different brackets picture element is corresponding is that subjective assessment counts; And extract the physical parameter value that the subjective feeling of human eye vision is had the greatest impact from physical parameter value corresponding to described different brackets picture element; Extracted described physical parameter value is quantized, obtain between parameter region corresponding to picture element that human eye accepts, as the physical parameter value of subjective assessment;
The evaluating apparatus of nearly eye display optical system picture element detects the physical parameter value that obtains detection to described optical lens to be evaluated;
The evaluating apparatus of described near eye display optical system picture element is set up the corresponding relation between physical parameter value and the described objective physical parameter value of described detection;
The evaluation criterion of the evaluating apparatus of described near eye display optical system picture element using the physical parameter value of described subjective assessment as input, according to the physical parameter value detecting described in optical lens to be measured and described corresponding relation, the physical parameter value of described detection is evaluated.
2. method according to claim 1, it is characterized in that, the evaluating apparatus of described near eye display optical system picture element comprises: for micro-display screen (1) of display standard test board, optical lens (2) to be evaluated, for a CCD camera of imaging, gather the image pick-up card (5) of image, for showing and the computing machine (6) of analyzing and processing image; A described CCD camera comprises camera lens (3) and target surface (4);
The evaluating apparatus of described nearly eye display optical system picture element contrasts the physical parameter value of described detection and described objective physical parameter value and revise, and sets up relation between the two, specifically comprises:
Described computing machine contrasts the physical parameter value of described detection and described objective physical parameter value and revise, and taking the latter as the algorithm according to repeatedly debugging described computing machine employing, make the physical parameter value of described detection be tending towards approaching described objective physical parameter value, and obtain relation between the two.
3. method according to claim 2, is characterized in that, the evaluating apparatus of nearly eye display optical system picture element detects the physical parameter value that obtains detection to described optical lens to be evaluated, specifically comprise:
Described micro-display screen (1) shows the standard test panel of manufacturing, outgoing directional light after described optical lens to be evaluated (2), after a described CCD camera picked-up, described image pick-up card (5) gathers image and is finally presented on described computing machine (6) again; By the software algorithm on described computing machine (6), gathered image is carried out to Treatment Analysis, obtain the physical parameter value of described detection.
4. method according to claim 2, it is characterized in that, described, extracted described physical parameter value is quantized, obtain between parameter region corresponding to picture element that human eye accepts, after physical parameter value as subjective assessment, before the evaluating apparatus of described nearly eye display optical system picture element detects to described optical lens to be evaluated the physical parameter value that obtains detecting, described method also comprises:
Described camera lens (3) to a described CCD camera and described target surface (4), described micro-display screen (1) are calibrated processing, the performance of only having described optical lens to be evaluated (2) that obtained physical parameter is expressed.
5. method according to claim 1, it is characterized in that, set up the corresponding relation between physical parameter value and the described objective physical parameter value of described detection, specifically comprise: the physical parameter value of described detection and described objective physical parameter value are contrasted and revised, using the latter's parameter value as standard and judgment, the evaluating apparatus of the described nearly eye display optical system picture element of debugging is to change the physical parameter value of described detection, make the physical parameter value of the described detection of the evaluating apparatus detection of described nearly eye display optical system picture element approach described objective physical parameter value, and set up described corresponding relation.
6. according to the arbitrary described method of claim 1-5, it is characterized in that, described performance parameter comprises at least one in field angle, distortion, resolution, contrast, mtf value and color saturation.
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| CN108965867A (en) * | 2018-07-25 | 2018-12-07 | 首都师范大学 | A kind of camera image calculation method of parameters and device |
| CN109253868A (en) * | 2018-10-24 | 2019-01-22 | 京东方科技集团股份有限公司 | A kind of visual field angle measuring method and device |
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| CN111487035A (en) * | 2019-01-25 | 2020-08-04 | 舜宇光学（浙江）研究院有限公司 | Alignment method and system for near-eye detection system |
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