CN105323580A - Digital camera imaging quality quick detection method - Google Patents
Digital camera imaging quality quick detection method Download PDFInfo
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- CN105323580A CN105323580A CN201410369152.9A CN201410369152A CN105323580A CN 105323580 A CN105323580 A CN 105323580A CN 201410369152 A CN201410369152 A CN 201410369152A CN 105323580 A CN105323580 A CN 105323580A
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Abstract
The invention discloses a digital camera imaging quality quick detection method. The method comprises the steps that a resolution pattern is formed by lines with spatial frequencies of 10lp/mm, 30lp/mm, 50lp/mm, 100lp/mm and 125lp/mm; and the resolution pattern is used as a unit and is laid in an edge view field, a 0.7 view field and a center view field of a normalized view field of a digital camera. According to the invention, the resolution of the digital camera can be accurately determined; chromatic aberration, deformities and other properties of the digital camera can be basically determined; and the simple, quick and effective digital camera detection method can be provided for mass consumers.
Description
Technical field
The present invention relates to a kind of detection method of quick detection digital camera imaging quality.
Background technology
Along with the progress of science and technology, improving constantly of living standards of the people, digital camera enters increasing average family as a kind of popular consumer goods.But while digital camera is universal, because ordinary populace lacks relevant professional knowledge, when Shopping Digital Camera often confuse by the commercial propaganda of producer, the one-tenth picture element reward of digital camera itself is have ignored when Shopping Digital Camera, and on the pixel that more attentiveness has been placed on digital camera and style, after using, consumer can find that the digital camera oneself chosen can not meet the shooting demand of oneself; Meanwhile, even if digital camera leaves some defects in process of production, consumer, after buying this defective product, owing to lacking relevant detection means, can not safeguard the legitimate rights and interests of oneself.Therefore, for ordinary populace consumer, be starved of a kind of digital camera method of discrimination be simple and easy to, to solve " relieved choose problem " of digital camera.
Can lack very much for this help instrument of ordinary populace consumer at present.Although there has been the checkout equipment of the digital camera lens quality of some specialties at present, as the theOptikosIOL-5000 series that Optikos company of the U.S. produces, it can measure the transfer function refractive power, effective focal length, line spread function, edge spread function, distortion, astigmatism, axial lateral chromatic aberration etc. of lens.Some checkout equipments such as the video MTF measuring instrument-Variant also having German OEG company to produce.But these equipment above, due to expensive, are grasped ashamed loaded down with trivial details, and general needs are used at laboratory environment by professional, so ordinary populace consumer cannot detect by these equipment the digital camera oneself bought usually.
Summary of the invention
For solving above-mentioned existing shortcoming, main purpose of the present invention is the detection method of the quick detection digital camera imaging quality providing a kind of practicality, for ordinary populace selects digital camera to detect easily in common occasion, differentiate the image quality of digital camera efficiently.
For reaching above-described object, the detection method of a kind of quick detection digital camera imaging quality of the present invention takes following technical scheme:
A kind of detection method of quick detection digital camera imaging quality, it is characterized in that, the lines being first respectively 10lp/mm, 30lp/mm, 50lp/mm, 100lp/mm and 125lp/mm by spatial frequency form resolution pattern, then the position being laid in the peripheral field of digital camera normalization visual field, 0.7 visual field and central vision for unit with this resolution pattern is formed.
The formation of described resolution pattern is: in a square block, and the spatial resolution that the thickest lines of its surrounding are corresponding is 10lp/mm, and the center gradually to this square block sets gradually 30lp/mm, 50lp/mm, 100lp/mm and 125lp/mm lines.
A detection method for quick detection digital camera imaging quality, is characterized in that, comprise the following steps:
1. the object distance e of digital camera is first determined, the resolution pattern described in preparation and described resolution chart board;
2. digital camera to be measured is put into the place apart from described resolution chart board e, and makes the center of digital camera high high consistent with the center of described resolution chart board;
3., under certain lighting condition, with digital camera to be measured, described mirror is distinguished that rate chart board is taken pictures;
4. then mirror is distinguished that the image of rate chart board or photo carry out analysis judgement, the imaging performance of digital camera can be obtained.
Describedly mirror distinguished that the image of rate chart board or photo carry out analyzing the content judged be:
Acutance: the image quality of digital camera when 10lp/mm can react the imaging acutance of digital camera;
Contrast: the image quality of digital camera when 30lp/mm can react the image contrast of digital camera;
Divide pigtail rate: the demand pairs that digital camera can be seen clearly are more, illustrate that the resolution of digital camera is higher;
The color representation reflection digital camera of image or photo is to the reducing power of color.
Adopt the present invention of as above technical scheme, there is following beneficial effect:
The photo of the present invention to the fade rate plate that digital camera to be measured is taken is utilized to carry out com-parison and analysis, namely the quality of digital camera is known predicably, not only more accurately can differentiate the resolution of digital camera, and can its performance such as aberration, deformity of primitive decision, meanwhile, can for consuming public provide one simply, efficiently with effective digital camera detection method.
Accompanying drawing explanation
Fig. 1 is typical modulation transfer function MIT curve.
Fig. 2 is the schematic diagram of an embodiment of resolution pattern of the present invention.
Fig. 3 is the schematic diagram of an embodiment of resolution chart board of the present invention.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the invention will be further described, but should not limit the scope of the invention with this.
First refer to Fig. 2 and Fig. 3, Fig. 2 is the schematic diagram of an embodiment of resolution pattern of the present invention, Fig. 3 is the schematic diagram of an embodiment of resolution chart board of the present invention, in this enforcement, regulation object distance is e=2000mm, measure simultaneously and obtain on-the-spot scope, and according to the size of general digital camera CCD, it is 250 times by calculating the magnification ratio of general digital camera on this predetermined distance, obtaining the corresponding image space frequency of object space is thus 10lp/mm, 30lp/mm, 50lp/mm, the width of often pair of line during 100lp/mm and 125lp/mm is respectively 25mm, 25/3mm, 5mm, 2.5mm and 2mm, why making 125lp/mm pattern is because the minimum image elemental size of the CCD of digital camera that root is sold according to the survey is in the market 5 microns * 5 microns, that is the image space limit of resolution of CCD is 100lp/mm, the digital camera that the authentication pattern of 125lp/mm is current cannot be differentiated in theory, if current digital camera can reasonablely be differentiated, illustrate that this camera shows in resolution quite excellent, if 100lp/mm resolution pattern can be differentiated, it is goodr for illustrating that this camera shows in resolution.Draw out resolution pattern thus as shown in Figure 2.In a square block, the spatial resolution of lines 1 correspondence that its surrounding is the thickest is 10lp/mm, and the center gradually to this square block sets gradually 2,3,4,5, and correspondence is 30/mm, 50lp/mm, 100lp/mm and 125lp/mm lines respectively.
Pattern is utilized to produce resolution chart board as element, as shown in Figure 3, as seen from the figure, the formation of described resolution chart board is: the normalization visual field of described digital camera is a rectangular block, four width resolution patterns are arranged in the corner of this rectangular block, justified margin, the center of one width resolution pattern to overlay in this rectangular block in the heart, all the other four width resolution patterns are overlayed on two diagonal of described rectangular block, make resolution pattern be centrally located at diagonal by center push up to angle 0.7 position.That is, above resolution chart board pattern arrangement according to the digital camera normalization angle of visual field 1.0,0.7,0 position arrange, correspond respectively to peripheral field, 0.7 visual field and central vision, just can thoroughly evaluating digital camera imaging quality by carrying out analyzing and processing to the imaging contexts of pattern on these three visual fields.
Utilize resolution chart board of the present invention to detect the method for digital camera imaging quality, comprise the following steps:
1. the object distance e=2000mm of digital camera is first determined, the resolution pattern described in preparation and described resolution chart board, as shown in Figures 2 and 3;
2. digital camera to be measured is put into the place apart from described resolution chart board 2000mm, and makes the center of digital camera high high consistent with the center of described resolution chart board;
3., under certain lighting condition, in length be 4 meters wide to be 2.5 meters high the be room closed of 3.3 meters, closing window and curtain, open the fluorescent lamp of two 30 watts, take with digital camera to be measured to resolution chart board;
Have in addition a bit it is to be noted that for the digital camera of consumer level, usually in shooting process, select aperture priority, aperture priority is as the criterion with our F-number of manually setting voluntarily, more automatically provide shutter parameter by digital camera according to environment at that time and light and coordinated.When in same environment, less the entered light of aperture is also fewer, and now camera just can extend the time for exposure of shutter.Aperture priority generally represents with " A " on digital camera; For professional digital camera, when testing, aperture is adjusted to f/8, the one-tenth picture element under this aperture debates the image quality that can represent camera.The digital camera of the different style of different brands is selected to take resolution chart board, same digital camera different pixels shelves are used respectively to take several during shooting, current digital camera has different pixel gears for selecting for during shooting, such as 3,000,000 pixels, 5,000,000 pixels etc.
4. then mirror is distinguished that the photo of rate chart board carries out analysis and judges, digital camera imaging performance can be obtained.
Described mirror is distinguished that the photo of rate chart board carries out analyzing that the content judged is the peripheral field distinguished mirror in the photo of rate chart board, the picture of the resolution pattern of 0.7 visual field and central vision analyzes.
The image quality key reaction of digital camera is in acutance, contrast and resolution these three.Acutance: acutance (Acutance) also known as fresh acutance, acutance, be phtographic lens reproduce brightly take the photograph the scenery intermediate level, slough off portion's level, the ability of low contrast shadow line details, faint brightness contrast and delicate color change.The camera lens that acutance is high, become that image contour distinctness, clear-cut margin, contrast are normal, levels are rich, texture fine and smooth, tone is bright and clear, texture is strong, the soft conjunction of color transition, colour reproduction are true, nature.The image quality of digital camera when 10lp/mm can react the imaging acutance of digital camera.
Contrast (contrast): the contrast of camera lens depends on fundamental frequency.That is, the one-tenth picture element of digital camera when 30lp/mm begs for the image contrast that can react digital camera.
Divide pigtail rate: resolution (resolution), also known as resolving power, resolution, taste, analysis power, resolving power and resolving power, refers to that phtographic lens clearly reproduces the ability of the fine fine joint of subject.The camera lens that obvious resolution is higher, the more clear exquisiteness of captured image.Its unit is " line right/millimeter ".Its advantage to quantize, and with data representation, makes result more directly perceived, more scientific, tighter.The demand pairs that digital camera can be seen clearly are more, illustrate that the resolution of digital camera is higher.
Digital camera can find out the performance of digital camera on color to the reducing power of color.
Obtain multi-group data by experiment, select several groups of data analysis contrasts at this.
(1) same camera shooting results contrast under different pixels: SonyT-7 is in 3,000,000 pixels and 5,000,000 pixels, Sony1-7 is when 3,000,000 pixel shelves, it is at central vision, shooting pattern corresponding when 0.7 visual field and 1.0 visual field is known by contrast, the resolution of the picture that Sony1-7 takes under 3,000,000 pixels and 5,000,000 pixel conditions does not have the change of essence, that is under both modes, can see in central vision that the resolution pattern of 125lp/mm is (after Nonlinear magnify certain proportion all reluctantly, a Office can be known) with eyes, and under two kinds of voxel models, the color of image is basically identical, under 0.7 visual field and 1.0 visual field situations, the resolution pattern of 125lp/mm is clear not as central vision, and this conforms to actual optical design requirements, observe simultaneously and find that intermediate luminance is brighter than edge brightness under two kinds of voxel models, the brightness of most edge is the darkest, this causes because camera lens itself exists certain vignetting, this be imaging definition and people in order to improve edge observation habit and deliberately for it, because user is concerned about the image quality of central vision more usually, there is a transition at center to edge.Also find from picture: the resolution pattern acutance of 10lp/mm is higher, and color is clear, and the resolution pattern contrast of 30lp/mm is higher.
(2) same brand, same pixel, different model shooting results contrasts: SonyT-7, T-11
By known SonyT-7 with T-11 of com-parison and analysis under identical shooting condition, use the photo of 5,000,000 pixel shootings, seem on the whole, it is huge that two groups of photos show difference on color, the integral color of T-7 is partially dark, picture sharpness is obviously much better, and the stray light sending out T-11 first from the photo of T-11 shooting is relatively more serious, and picture entirety has a kind of hazy sensations.In contrast, find that the contrast of two camera is all right, bright-dark cut is obvious.In resolution, difference is little, and the resolution of T-7 is slightly better than the resolution of T-11.Picture finds that peripheral field all exists certain aberration after amplifying, and this is that lens design is unavoidable.(3) different brands is at same gear, and shooting results contrast under same pixel condition: the pixel value due to existing market main flow camera is 5,000,000 pixels, so select 5,000,000 pixel digital cameras of several large main brand on market when comparative selection object.Analyze with contrast known by experiment, the take pictures resolution pattern of 125lp/mm of middle central vision of Canoniuxs70 and Canoniuxs500 can comparatively clearly be seen, this illustrates that the performance of two camera in resolution is better than the camera of two other brand.This two camera comparatively has larger difference in centre in the contrast of peripheral field, contrast obviously not as middle is high, not identical with the performance of other two camera yet, but the performance between them is consistent, the performance of the camera of visible same brand is still very consistent, and this is relevant with the design concept of self of each enterprise.In acutance, two camera of Canon is completely the same in central vision performance, and be relatively good, Sony takes second place, and Casio performance is the poorest.Simultaneously, we also clearly can find out the color of the photo that CasioZ-50 takes and two difference is very large above, this should not be that photographic film causes, and may be that the reason of miscellaneous part causes, and this have impact on the one-tenth picture element of this digital camera the most to a certain extent.
Experiment shows, the present invention checks the method for digital camera imaging to be effective, and easy and simple to handle, for ordinary consumer, distinguishes that the photo of rate chart board carries out analyzing the image quality judging just to distinguish digital camera qualitatively to mirror.Not only can judge the height of resolution, and the Performance Parameters such as aberration, distortion of camera can be found out very easily.
Claims (4)
1. one kind is fast detected the detection method of digital camera imaging quality, it is characterized in that, the lines being first respectively 10lp/mm, 30lp/mm, 50lp/mm, 100lp/mm and 125lp/mm by spatial frequency form resolution pattern, then the position being laid in the peripheral field of digital camera normalization visual field, 0.7 visual field and central vision for unit with this resolution pattern is formed.
2. the detection method of a kind of quick detection digital camera imaging quality according to claim 1, it is characterized in that, the formation of described resolution pattern is: in a square block, the spatial resolution that the thickest lines of its surrounding are corresponding is 10lp/mm, and the center gradually to this square block sets gradually 30lp/mm, 50lp/mm, 100lp/mm and 125lp/mm lines.
3. the quick detection method detecting digital camera imaging quality, is characterized in that, comprise the following steps:
1. the object distance e of digital camera is first determined, the resolution pattern described in preparation and described resolution chart board;
2. digital camera to be measured is put into the place apart from described resolution chart board e, and makes the center of digital camera high high consistent with the center of described resolution chart board;
3., under certain lighting condition, with digital camera to be measured, described mirror is distinguished that rate chart board is taken pictures;
4. then mirror is distinguished that the image of rate chart board or photo carry out analysis judgement, the imaging performance of digital camera can be obtained.
4. the detection method of a kind of quick detection digital camera imaging quality according to claim 3, is characterized in that, describedly distinguishes that the image of rate chart board or photo carry out analyzing the content judged to mirror and is:
Acutance: the image quality of digital camera when 10lp/mm can react the imaging acutance of digital camera;
Contrast: the image quality of digital camera when 30lp/mm can react the image contrast of digital camera;
Divide pigtail rate: the demand pairs that digital camera can be seen clearly are more, illustrate that the resolution of digital camera is higher;
The color representation reflection digital camera of image or photo is to the reducing power of color.
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| CN201410369152.9A CN105323580A (en) | 2014-07-30 | 2014-07-30 | Digital camera imaging quality quick detection method |
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| CN201410369152.9A CN105323580A (en) | 2014-07-30 | 2014-07-30 | Digital camera imaging quality quick detection method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106454325A (en) * | 2016-10-12 | 2017-02-22 | 芜湖赋兴光电有限公司 | Mobile phone camera module distortion test method |
| CN106525393A (en) * | 2017-01-17 | 2017-03-22 | 福建师范大学 | Optical projection and detection resolving power plate for industrial camera lens |
| CN111279692A (en) * | 2019-03-12 | 2020-06-12 | 深圳市大疆创新科技有限公司 | Method for testing shooting stability, calibration device and calibration system |
| CN116071354A (en) * | 2023-03-06 | 2023-05-05 | 深圳思谋信息科技有限公司 | Image processing method, device, computer equipment and computer readable storage medium |
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2014
- 2014-07-30 CN CN201410369152.9A patent/CN105323580A/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106454325A (en) * | 2016-10-12 | 2017-02-22 | 芜湖赋兴光电有限公司 | Mobile phone camera module distortion test method |
| CN106525393A (en) * | 2017-01-17 | 2017-03-22 | 福建师范大学 | Optical projection and detection resolving power plate for industrial camera lens |
| CN106525393B (en) * | 2017-01-17 | 2019-05-10 | 福建师范大学 | A kind of industrial camera lens optical projection detection resolution plate |
| CN111279692A (en) * | 2019-03-12 | 2020-06-12 | 深圳市大疆创新科技有限公司 | Method for testing shooting stability, calibration device and calibration system |
| CN111279692B (en) * | 2019-03-12 | 2022-03-04 | 深圳市大疆创新科技有限公司 | Method for testing shooting stability, calibration device and calibration system |
| CN116071354A (en) * | 2023-03-06 | 2023-05-05 | 深圳思谋信息科技有限公司 | Image processing method, device, computer equipment and computer readable storage medium |
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Application publication date: 20160210 |