Method and device for identifying region of interest in SFR test card image, and medium
A region of interest and test card technology, which is applied to a device for identifying regions of interest in an SFR test card image, in the field of non-temporary computer storage media, and can solve troublesome operations, affect the accuracy of the spatial frequency response SFR algorithm, and feel unsatisfied. The requirements of the region of interest and other issues can achieve the effect of high accuracy, self-adaptive automatic identification, and avoidance of inaccurate calculated values.
Inactive Publication Date: 2021-10-01
NANCHANG O FILM OPTICAL ELECTRONICS TECH CO LTD
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Problems solved by technology
[0004] In related technologies, for determining the region of interest in an image, some solutions require the user to manually mark the region of interest, but the application of this method has limitations and the operation is cumbersome
Alternatively, some schemes determine the region of interest of the SFR test card through a preset configuration file. However, when the position of the field of view changes in this method, the coordinates of the determined region of interest may not meet the requirements of the spatial frequency response SFR algorithm. Regional requirements that affect the accuracy of the spatial frequency response SFR algorithm
Method used
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[0030] Embodiments of the present invention are described in detail below, and the embodiments described with reference to the drawings are exemplary, and embodiments of the present invention are described in detail below.
[0031] The following describes a method for identifying a region of interest in an SFR test card image according to an embodiment of the present invention with reference to the accompanying drawings. The method can realize automatic recognition of the region of interest and improve the accuracy of the SFR algorithm result.
[0032] figure 2 Shown is a flowchart of a method for identifying a region of interest in an image of an SFR test card provided by an embodiment of the present invention. like figure 2As shown, the method for identifying the region of interest in the image of the SFR test card in the embodiment of the present invention includes at least steps S1-S5.
[0033] Step S1, acquiring the image of the SFR test card.
[0034] Among them, th...
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The invention discloses a method and device for identifying a region of interest in an SFR test card image and a medium, and the method for identifying the region of interest in the SFR test card image comprises the steps: obtaining the SFR test card image; calculating the edge contour of a test black block in the SFR test card image; calculating a centroid coordinate of the edge contour; determining the vertex coordinates of the test black block according to the distance between the contour point of the edge contour and the center of mass; and determining the region of interest according to the vertex coordinates of the test black block and a set constraint value of the region of interest. According to the method, automatic identification of the region of interest can be realized, and the accuracy of the SFR algorithm result is improved.
Description
technical field [0001] The invention relates to the field of image technology, in particular to a method for identifying an area of interest in an image of an SFR test card, a device for identifying an area of interest in an image of an SFR test card, and a non-temporary computer storage medium. Background technique [0002] With the rapid development of digital images, cameras have been widely used in people's lives. Camera performance testing has become very important in design and production. Testing the resolution of cameras is a necessary part of camera performance testing. [0003] The spatial frequency response SFR (Spatial Frequency Response) test card has a white background, such as figure 1 As shown, it includes a plurality of obliquely distributed black blocks. The region of interest is a rectangle centered on a point on a certain hypotenuse of the specified black block. The spatial frequency response SFR of the specified black block is determined according to...
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IPC IPC(8): G06K9/32G06T7/00G06T7/13G06T7/66H04N17/00
CPCG06T7/0004G06T7/13G06T7/66H04N17/002
Inventor 胡友华
Owner NANCHANG O FILM OPTICAL ELECTRONICS TECH CO LTD