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Image gray value adjusting method and apparatus

A technology of image grayscale and adjustment method, which is applied in the information field, can solve the problems that noise and band interference cannot be controlled, and control parameters cannot be provided, so as to save computing and/or storage resources and reduce complexity

Active Publication Date: 2018-03-20
BOE TECH GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, contrast enhancement techniques (e.g., histogram equalization techniques) may cause gaps in the output histogram, cause excessively enhanced output, fail to provide control parameters, and / or fail to control noise and banding

Method used

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  • Image gray value adjusting method and apparatus
  • Image gray value adjusting method and apparatus

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Embodiment Construction

[0027] Embodiments of the present disclosure are described below with reference to the drawings. In the following description, numerous specific details are set forth in order to enable those skilled in the art to more fully understand and practice the present disclosure. It will be apparent, however, to one skilled in the art that embodiments of the present disclosure may be practiced without some of these specific details. Furthermore, it should be understood that the disclosure is not limited to the particular embodiments described. Rather, it is contemplated that any combination of the features and elements described below may be used to implement the embodiments of the present disclosure. Accordingly, the following aspects, features, embodiments and advantages are by way of illustration only and should not be considered elements or limitations of the claims unless explicitly stated in the claims.

[0028] Modern standards for digital television, such as BT.2020, increas...

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Abstract

An image gray value adjusting method and apparatus are disclosed. The method comprises the following steps: a first mapping value of a gray value of each pixel in an image is calculated via a histogram equalization mapping function; via the histogram equalization mapping function, a second mapping value is calculated after a first preset value is subtracted from the gray value of each pixel; if the gray value minus the first preset value exceeds a preset gray value range, a minimum value in the preset gray value range is chosen for calculating the second mapping value; via the histogram equalization mapping function, a third mapping value is obtained after the second preset value is added to the gray value of each pixel; if the gray value plus the second preset value exceeds a preset grayvalue range, a maximum value in the gray value range is chosen for calculating the third mapping value; an output gray value of each pixel is calculated based on the first mapping value, the second mapping value, the third mapping value and weights thereof. Technical effects of the image gray value adjusting method and apparatus disclosed in an embodiment of the invention are that details in the image cannot be moved, gaps in a histogram can be filled and complexity of the method can be lowered.

Description

technical field [0001] Embodiments of the present disclosure relate to information technology, and more particularly to a method and device for adjusting an image gray value. Background technique [0002] In recent years, with the rapid development of electronic technology and image processing technology, image or vision systems are widely used in various industries, such as traffic monitoring, driving assistance systems, public security, border customs, sports event reporting, event detection, tracking, Scene analysis and classification, object detection and recognition, image indexing and retrieval, and many other fields. In most image or vision processing applications / systems, such as digital photography, medical image analysis, remote sensing, LCD display processing, and scientific visualization, image contrast adjustment can play a key role. [0003] In general, there are several reasons for an image / video to have poor contrast (e.g. the image has a concentrated distri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/40
CPCG06T5/40G06T2207/20208G06T2207/10024G06T5/92G06T5/70G06T5/90
Inventor 那彦波严寒段然
Owner BOE TECH GRP CO LTD
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