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Camera response curve calibration method based on single image

A camera response and calibration method technology, which is applied in image analysis, image data processing, instruments, etc., can solve problems such as robust curves and complex image capture process, and achieve the effects of stable solution, simple shooting method, and fast calculation speed

Inactive Publication Date: 2010-03-03
BEIHANG UNIV
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  • Claims
  • Application Information

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Problems solved by technology

The curve calculation of this method is more robust, but the process of capturing images is more complicated

Method used

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  • Camera response curve calibration method based on single image
  • Camera response curve calibration method based on single image
  • Camera response curve calibration method based on single image

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Embodiment Construction

[0014] Concrete steps of the present invention are as follows:

[0015] (1) Convert the captured image into a grayscale image, perform image pyramid algorithm down-sampling on the image, and then up-sampling to eliminate the noise in the image;

[0016] (2) Use the Canny operator to perform edge detection on the image, extract the edges in the image, perform expansion processing, and merge adjacent edges;

[0017] (3) Binarize the grayscale image, search for contours on the binarized image, and extract quadrilaterals;

[0018] (4) Perform clustering processing on the extracted quadrilaterals to obtain 24 color block areas, calculate the average pixel value according to the color block area on the image, and establish the corresponding relationship between the collected image value and the true color value of the standard color plate through the camera response curve, The 24 color blocks can construct a set of linear equations, and use the least square method to solve the came...

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Abstract

A camera response curve calibration method based on a single image includes the following steps of: (1) shooting one image for a 24-color standard color plate not in the situation of overexposure; and(2) solving the mean value of 24 color lump images and comparing with a true color value, constructing a camera response curve equation and using a least squares numerical method for solving. The method is simple in shooting and quick in calculation speed.

Description

technical field [0001] The invention belongs to the technical fields of computer virtual reality and computer graphics and imaging, and specifically uses a single image captured by a camera to calibrate the camera response curve, and is used to restore the mapping relationship between the pixel value captured by the camera and the real reflection value of the object surface. Background technique [0002] In recent years, with the development of digital camera imaging technology, it has been widely used in the fields of computer vision and computer graphics. However, the precision of digital images is limited, and the expressible brightness range is 0-255. Therefore, the real reflected light intensity on the surface of the object is mapped to the pixel value of the digital image, which needs to be mapped by a function. This mapping function is called the camera response curve. However, in the field of computer vision and computer graphics, it is necessary to restore the true ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00
Inventor 赵沁平胡勇邹玲齐越
Owner BEIHANG UNIV
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