Test method for spatial frequency response of fisheye camera
A technology of spatial frequency response and test method, which is applied in image communication, television, electrical components, etc., can solve problems such as deformation of the edges around the image, inability to obtain valid image card information around the edges of the image, and inability to test the spatial frequency response of fisheye cameras, etc.
Active Publication Date: 2018-06-26
HUIZHOU DESAY SV AUTOMOTIVE
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Especially for a fisheye camera with a wide viewing angle greater than 180 degrees, when using the standard test chart defined by ISO12233 to test the spatial frequency response of the image, the edges around the image of the standard test chart captured by the fisheye camera will be severely deformed , unable to obtain valid image card information around the edges of the image
Therefore, the characteristics of the fisheye camera lead to the fact that when testing its spatial frequency response, the spatial frequency response of the center of the fisheye camera can only be barely tested, and the spatial frequency response of the surrounding edges of the fisheye camera cannot be tested.
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[0017] The method for testing the spatial frequency response of the fisheye camera of the present invention will be further described in detail below in conjunction with specific embodiments and accompanying drawings.
[0018] Please refer to figure 1 and figure 2 , figure 1 A schematic diagram of an existing standard test chart, figure 2 It is a schematic diagram of a standard test chart captured by a fisheye camera in an embodiment. figure 1 The standard test chart is the version released on February 15, 2014 by the ISO 12233 standard. Understandably, other versions of the standard test chart can also be used to test the spatial frequency response of the camera. The method for testing the spatial frequency response of the camera comprises the following steps: first, shoot a standard test chart through the camera, so that the effective height of the standard test chart occupies the entire picture taken by the camera; Regions of interest were analyzed with hypotenuse sof...
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The invention relates to a test method for spatial frequency responses of a fisheye camera. The test method comprises the steps of implementing predistortion treatment on a standard test picture card according to a plurality of perspectives of the fisheye camera, thus acquiring predistortion test picture cards set at the plurality of perspectives of the fisheye camera; placing the corresponding predistortion test picture cards at the plurality of perspectives around the fisheye camera; adjusting the positions of the predistortion test picture cards at the plurality of perspectives according to the position and the perspectives of the fisheye camera, thus allowing a whole image shot by the fisheye camera to cover effective picture card information; and shooting the plurality of predistortion test picture cards by using the fisheye camera to test the spatial frequency responses of the fisheye camera. According to the test method for the spatial frequency responses of the fisheye camera provided by the invention, the spatial frequency responses of the center and edges of the fisheye camera can be effectively measured.
Description
technical field [0001] The invention relates to a method for testing the spatial frequency response of a lens, in particular to a method for testing the spatial frequency response of a fisheye camera. Background technique [0002] ISO12233 defines the test chart and test method for the spatial frequency response of digital cameras. The test chart and test method are suitable for testing the spatial frequency response of ordinary digital cameras or video camera lenses with small distortion. However, it is extremely difficult to apply the test chart and test method to the spatial frequency response test of the fisheye camera. Because the fisheye camera has a wide viewing angle, some fisheye cameras even have a horizontal viewing angle of more than 200 degrees. Therefore, except for the center of the image captured by the fisheye camera, the surrounding areas of the captured image are severely deformed, that is, the normal image passes through the fisheye. Barrel distortion oc...
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IPC IPC(8): H04N17/00
Inventor 廖剑雄张禅亮覃韶辉
Owner HUIZHOU DESAY SV AUTOMOTIVE