CN210168147U - Test card for detecting image resolution of camera equipment - Google Patents
Test card for detecting image resolution of camera equipment Download PDFInfo
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- CN210168147U CN210168147U CN201921208914.1U CN201921208914U CN210168147U CN 210168147 U CN210168147 U CN 210168147U CN 201921208914 U CN201921208914 U CN 201921208914U CN 210168147 U CN210168147 U CN 210168147U
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Abstract
The utility model provides a test card for detecting camera equipment image resolution can be based on a test card and test two directions of x-y of image simultaneously. The test card comprises a card body, wherein the card body is of a square plane structure, at least one surface of the card body is uniformly divided into a plurality of squares with equal length and width, odd rows are filled with a color I, even rows are filled with a color II, even columns are filled with the color II when odd columns are filled with the color I, and even columns are filled with the color I when odd columns are filled with the color II. The technical scheme provided by the utility model, not only reduced the test number of times, effectively improved work efficiency, avoided the error that the people adjustment test direction leads to and the extra cost of increase again simultaneously.
Description
[ technical field ] A method for producing a semiconductor device
The utility model relates to a camera equipment image processing technology field, in particular to a test card for detecting camera equipment image resolution.
[ background of the invention ]
Under the influence of an optical imaging mechanism, an image acquired by the image pickup device has certain deformation, and in order to ensure the normal use of a subsequent image, the image resolution DPI (Dots Per Inch Per Inc) of the image pickup device needs to be detected.
The current common test mode is to select different test cards for DPI detection in the X direction and the Y direction by establishing a two-dimensional coordinate system X-o-Y, but the test has the following problems: (1) different test cards are selected for different directions to carry out respective tests, so that the working efficiency is low; (2) the x direction and the y direction are manually adjusted, so that extra direction control cost is increased, and the operation error cannot ensure that the x direction and the y direction are completely vertical in space, so that the accuracy of a test result cannot be ensured.
[ Utility model ] content
To the problem that provides in the background art, the utility model provides a test card for detecting camera equipment image resolution can test two directions of x-y of image simultaneously based on a test card.
The utility model provides a test card for detecting camera equipment image resolution, including the card body, the card body is square planar structure, card body surface one side at least is filled with colour I by a plurality of long wide squares that equal by evenly dividing, wherein the odd number line, and the even number line is filled with colour II, and even number line fills with colour II when odd number line is filled with colour I, and even number line fills with colour I when odd number line is filled with colour II.
The color I and the color II are two colors with obvious contrast, the color I is preferably black, and the color II is preferably white. Three types of squares were obtained after color filling: 1. grid 1: color II filled squares only; 2. grid 2: color I and color II mixed filled squares, position: the square 1 is right above, right below, right left and right; 3. grid 3: color I only filled squares, position: the upper left, lower left, upper right and lower right of the square grid 1.
The test card is made of common materials which are not easy to deform in the market, such as film, plastics, glass, ceramics and the like.
The side length value of the square is required to be larger than the maximum scribed line resolution of the camera equipment, and the value range is 5-10 times, preferably 7 times, of the maximum scribed line resolution of the camera equipment; wherein the maximum reticle resolution of the image pickup apparatus is
Where a is the minimum unit interval of the camera sensor, and u and v are the object distance and the image distance of the optical imaging system when the camera is actually shooting, respectively.
The number of the squares on the surface of the test card is determined by the imaging area of the camera equipment, if the width of the imaging area is W0Height of H0Side length of square grid is d0Then, the number of squares 1 in each row is equal to
The number of squares 1 in each row is
Wherein n1 and n2 are redundant numbers and take any integer in the range of 2-5, so as to obtain the width W of the test card0+n2*2*d0Height H of test card0+n1*2*d0。
A use method of a test card for detecting image resolution of camera equipment comprises the following specific steps:
step 1: aiming at the current place and the used camera equipment, preparing a corresponding test card and acquiring a corresponding test card image;
step 2: calculating the pixel distance of the horizontal and vertical directions of the test card image;
and step 3: and (3) calculating the DPI of the image according to the actual physical distances of the test card in the horizontal and vertical directions and the pixel distances of the test card image in the horizontal and vertical directions obtained in the step (2).
The pixel distance calculation method in the horizontal and vertical directions of the test card image is as follows:
the first step is as follows:
the sum of the absolute values of the gradient values of pixels at each row in the x-direction GradRow (y) and at each column in the y-direction GradCol (x) are calculated.
The second step is that:
the number of peaks appearing in the function GradRow (y) and GradCol (x) is counted, respectively.
The third step:
and determining the number of squares in a single row and a single column in the test card image according to the peak value number, and calculating the pixel distance of the test card image in the horizontal direction and the pixel distance in the vertical direction by combining the side length of the squares.
The fourth step:
image horizontal direction DPI of camera equipmentxDPI in the vertical direction, i.e. the pixel distance in the horizontal direction of the test card image/the width of the test cardyPixel distance in the vertical direction of the test card image/test card height.
The utility model provides a pair of a test card for detecting camera equipment image resolution has not only reduced the test number of times, has effectively improved work efficiency, has avoided the error that the people adjustment test direction leads to and the extra cost of increase again simultaneously.
[ description of the drawings ]
Fig. 1 is a schematic view of a filling process of a test card according to an embodiment of the present invention.
[ detailed description ] embodiments
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention will be further described with reference to the accompanying drawings and examples.
As shown in fig. 1, the utility model provides a test card for detecting camera equipment image resolution, include the rectangle plane card body of being made by the film, card body surface is evenly divided into the square that a plurality of length and width equal, and wherein odd number row and odd number row fill with black, and even number row fill with white. Three types of squares were obtained after color filling: 1. white check; 2. black squares I which are positioned right above, right below, right left and right of the white squares; 3. and the black square grids II are positioned at the upper left, lower left, upper right and lower right of the white square grids.
Length d of the square0The value is 7 times of the maximum reticle resolution of the camera equipment, wherein the maximum reticle resolution of the camera equipment is
Wherein a is the minimum unit interval of the camera sensor and is determined by the parameters of the camera sensor, for example, a of the image sensor of the Gekko micro GC0328 is 0.004 mm; u and v are the object distance and the image distance of the optical imaging system when the camera shooting device actually shoots respectively, and can be automatically adjusted by a user according to requirements.
The width of the imaging area of the image pickup apparatus in this embodiment is W0Height of H0Side length of square grid is d0The number of white squares in each row is equal to
The number of white squares in each column is
Wherein 3 is the moving allowance of the test card during the test, so as to obtain the width W of the test card0+3*2*d0Height H of test card0+3*2*d0。
A use method of a test card for detecting image resolution of camera equipment comprises the following specific steps:
step 1: aiming at the current place and the used camera equipment, preparing a corresponding test card and acquiring a corresponding test card image;
step 2: calculating the pixel distance of the horizontal and vertical directions of the test card image;
and step 3: and (3) calculating the DPI of the image according to the actual physical distances of the test card in the horizontal and vertical directions and the pixel distances of the test card image in the horizontal and vertical directions obtained in the step (2).
The actual physical distance W of the test card in the horizontal direction in the step 1 is (W)0+3*2*d0) The actual physical distance H in the vertical direction is (H)0+3*2*d0)。
The pixel distance calculation method in the horizontal and vertical directions of the test card image in the step 2 is as follows:
the first step is as follows:
calculating the sum of absolute values of gradient values of pixels of each row in the x-direction
Calculating the sum of absolute values of gradient values of pixels of each column in the y direction
The second step is that:
drawing two-dimensional coordinates of GradRow (y) and GradCol (x) and counting the number of the appeared peaks, wherein the number of the peaks of GradRow (y) is PxThe number of peaks of GradCol (x) is PyThen the total number of squares in each row is (P)x+1), the total number of squares in each column is (P)y+1)。
The third step:
the pixel distance nW in the horizontal direction of the test card image (P)x+1)*d0
The pixel distance nH in the vertical direction of the test card image (P)y+1)*d0
In view of the above, it is desirable to provide,
DPI (deep packet inspection) device for image horizontal direction of current camera equipmentxPerpendicular DPI (total of nW/W)y＝nH/H。
The above embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present invention.
Claims (9)
1. A test card for detecting image resolution of camera equipment comprises a card body, wherein the card body is of a square plane structure, and is characterized in that at least one surface of the card body is uniformly divided into a plurality of squares with equal length and width, wherein odd rows are filled with a color I, even rows are filled with a color II, odd columns are filled with the color I, even columns are filled with the color II, and odd columns are filled with the color II, even columns are filled with the color I.
2. The test card of claim 1, wherein the color I and the color II are two colors that are distinct in contrast.
3. The test card of claim 1, wherein the test card is made of a commercially available material that is not easily deformable, such as film, plastic, glass, ceramic, etc.
4. The test card of claim 1, wherein the square side length has a range larger than the maximum reticle resolution of the camera device and a range 5 to 10 times the maximum reticle resolution of the camera device.
5. The test card of claim 4, wherein the camera device has a maximum reticle resolution of
Where a is the minimum unit interval of the camera sensor, and u and v are the object distance and the image distance of the optical imaging system when the camera is actually shooting, respectively.
6. The test card according to claim 1 or 4, wherein the number of squares on the surface of the test card is determined by the imaging area of the image pickup device and the side length of the squares.
7. The test card of claim 2, wherein color I is black and color II is white.
8. The test card of claim 3, wherein the test card is a film.
9. The test card of claim 4, wherein the square edge length ranges from 7 times the maximum reticle resolution of the camera.
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| CN201921208914.1U CN210168147U (en) | 2019-07-30 | 2019-07-30 | Test card for detecting image resolution of camera equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112312121A (en) * | 2019-07-30 | 2021-02-02 | 浙江中正智能科技有限公司 | Test card for detecting image resolution of camera equipment and use method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112312121A (en) * | 2019-07-30 | 2021-02-02 | 浙江中正智能科技有限公司 | Test card for detecting image resolution of camera equipment and use method thereof |
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