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Image contrast adjustment method and image contrast adjustment device

A technology of image comparison and adjustment method, which is applied in the field of image processing, and can solve problems such as inaccurate image processing results, inaccurate values ​​of each pixel, halo phenomenon, etc.

Active Publication Date: 2015-04-08
XIAOMI INC
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] Since the histogram mapping function is determined according to the target pixel point and target pixel value of each pixel block, that is, according to each discrete value, the determined histogram mapping function may not be accurate, and it is easy to cause the Pixel values ​​are inaccurate, resulting in inaccurate image processing results
In addition, since the pixel values ​​determined in this way are relatively smooth, it is easy to cause halo phenomenon

Method used

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  • Image contrast adjustment method and image contrast adjustment device
  • Image contrast adjustment method and image contrast adjustment device
  • Image contrast adjustment method and image contrast adjustment device

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Embodiment Construction

[0082] Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with aspects of the invention as recited in the appended claims.

[0083] figure 1 It is a flowchart of a method for adjusting image contrast according to an exemplary embodiment, and the method for adjusting image contrast is used in a terminal. Such as figure 1 As shown, the method flow provided by the embodiment of the present disclosure includes the following steps.

[0084] In step S101, the pixel value of each pixel of the image to be processed is acquir...

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Abstract

The invention relates to an image contrast adjustment method and an image contrast adjustment device, and belongs to the technical field of image processing. The method comprises the steps of determining a first expansion coefficient of the pixel value of each pixel and a first translation coefficient of the pixel value of each pixel, determining a first target pixel value of each pixel according to the pixel value of the pixel and the first expansion coefficient and the first translation coefficient of the pixel value of the pixel, and determining an image after contrast adjustment according to the first target pixel value of each pixel. The first target pixel value is determined for the pixel value of each pixel, which makes the processing result more accurate. The determined first target pixel value of each pixel and the pixel value of the pixel form a first linear relationship, and the difference between the first target pixel value of each pixel and the pixel value of the pixel is the minimum, so that the phenomenon that the first target pixel value of each pixel is relatively smooth is avoided, and the halo phenomenon is avoided.

Description

technical field [0001] The present disclosure relates to the technical field of image processing, and in particular to an image contrast adjustment method and device. Background technique [0002] At present, when processing an image, it is often necessary to adjust the contrast of a local area of ​​the image, so as to enlarge the gray level difference between the local area of ​​the image and other areas, so as to achieve the purpose of enhancing the contrast and making the displayed image clearer and more natural. When adjusting the contrast of a local area of ​​an image, the image processing method used directly affects the image processing effect. [0003] In related technologies, when adjusting the contrast of a local area of ​​an image, a local histogram equalization method is usually used for implementation. The specific process of this method is: divide the image to be processed into multiple pixel blocks; perform linear stretching or translation on the pixel values...

Claims

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Application Information

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IPC IPC(8): G06T3/00
CPCG06T2207/20208G06T5/92
Inventor 王百超秦秋平陈志军
Owner XIAOMI INC
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