Image processing method and device based on gamma correction
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A gamma correction and image processing technology, applied in the field of image processing, can solve problems such as inability to divide and enhance
Inactive Publication Date: 2012-03-14
RICOH KK
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[0010] However, the image enhancement effect of the above-mentioned traditional technologies is limited. They cannot adaptively and accurately divide the illumination type
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[0030] In order to enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0031] figure 1 is an overall flowchart illustrating the image processing method 100 according to an embodiment of the present invention.
[0032] Such as figure 1 As shown, the image processing method 100 may include an obtaining step 110, obtaining the pixel number distribution of the image in the brightness space based on the image; a dividing step 120, dividing the brightness space into at least three brightness intervals; an analyzing step 130, for at least In at least one of the three brightness intervals, the number of pixels contained in the brightness interval is compared with a predetermined threshold corresponding to the brightness interval to determine the illumination type of the image; the gamma coefficient determining step 140, base...
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Abstract
The invention provides an image processing method and device. The method comprises the following steps of: an obtaining step, a dividing step, an analyzing step, a gamma coefficient assuring step and a gamma correction step, wherein the obtaining step is used for obtaining a pixel number distribution of an image in a brightness space; the dividing step is used for dividing the brightness space into at least three brightness regions; the analyzing step is used for comparing a pixel number containing the brightness space with a pre-set threshold value in the brightness space to assure a light illumination type of the image, aiming to at least one brightness region in at least three brightness regions; the gamma coefficient assuring step is used for assuring the number of gamma coefficients needed by the gamma correction, the size of each gamma coefficient and a defining domain of the gamma correction corresponding each gamma coefficient, based on the light illumination type of the image and the pixel number distribution of the image; and the gamma correction step is used for carrying out the gamma correction on the image, based on the number of the gamma coefficients, the size of each gamma coefficient and the defining domain of the gamma correction corresponding each gamma coefficient.
Description
technical field [0001] The present invention relates generally to image processing, and in particular, to methods and apparatus for image enhancement of images and videos. Background technique [0002] Different lighting situations can be seen everywhere: indoors, outdoors, offices, conference rooms, supermarkets, etc. Bad lighting conditions, such as dark, bright, polarized (for example, backlight conditions where the subject is dark and the background is bright, and the subject is bright and the background is dark), etc., may cause image or video contrast Low, narrow dynamic range, and noise. Therefore, it is necessary to perform image enhancement on various bad lighting conditions so that the brightness of the image tends to be normal. [0003] Currently, various image enhancement techniques are being researched and applied, such as: histogram equalization, local histogram equalization, histogram matching, smoothing, sharpening, gamma correction, etc., but each method h...
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