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Method and device for automatically adjusting chroma and saturation

A chromaticity adjustment and automatic adjustment technology, applied in the field of image processing, can solve the problems of increasing hardware cost and implementation difficulties, and achieve the effect of improving quality, meeting different requirements, and the method is effective and flexible.

Inactive Publication Date: 2011-08-24
HAIER BEIJING IC DESIGN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method needs to sectorize the area to be adjusted in the new coordinates, which greatly increases the hardware cost and is difficult to implement, and is not suitable for application in TV chip design.

Method used

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  • Method and device for automatically adjusting chroma and saturation
  • Method and device for automatically adjusting chroma and saturation
  • Method and device for automatically adjusting chroma and saturation

Examples

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Embodiment Construction

[0014] figure 1 It is an automatic hue and saturation adjustment device according to one embodiment of the present invention. Such as figure 1 As shown, the device includes a brightness gain generation module, a hue and saturation generation module, a hue weight value generation module and a hue saturation adjustment module.

[0015] The brightness gain generation module is used to adjust the brightness after the contrast adjustment. Contrast-adjusted video signals without color saturation compensation can result in images that appear "bleached" or "too dark." The brightness gain generation module calculates the brightness gain factor by comparing the source video signal with the video signal after contrast enhancement, so as to adjust the brightness of the image. However, for modules that do not require contrast adjustment, the brightness gain factor can be set to 1. Due to the limitation of the maximum brightness value, if the brightness gain value is greater than the ma...

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Abstract

The invention provides a method and a device for automatically adjusting chroma and saturation. The method comprises the following steps: calculating the chromatic value and the saturation value of each pixel based on Y, CB and CR values of a video signal; acquiring a saturation variation value by looking up a chroma-saturation variation comparison table containing weighting functions of different chroma based on the chromatic value, and acquiring a weighted value based on the chroma adjustment after multiplying a gain parameter by the saturation variation value; and acquiring an adjusted CB value and an adjusted CR value after multiplying the finally acquired chroma adjustment weighted value by the CB value and the CR value respectively so as to be convenient to output the adjusted CB and CR values to a display device for display. The invention adopts the gain adjustment algorithm to adjust the saturation of any colors in any degrees, has effective and flexible implementation method, enhances the quality of digital video images and satisfies different requirements of users for video quality.

Description

technical field [0001] This invention relates to image processing, and more particularly to the conditioning of digital images and video signals. Background technique [0002] Usually the color of the video signal can be expressed in the RGB three-dimensional space based on Cartesian coordinates, and the combination of the three primary colors of red (R), green (G), and blue (B) can form any color. The color of an opaque object depends on the wavelength of light it reflects; for example, a red object appears red because it reflects only the wavelength band that produces red light; when an opaque object reflects all wavelength bands, the object is white; conversely, when the object absorbs all wavelength bands It appears black. However, the RGB representation of video signals is not very effective in reality due to the signal bandwidth requirements. In standard-definition SD and high-definition HD television systems, video signals are usually represented in digital componen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N9/64
Inventor 李璐
Owner HAIER BEIJING IC DESIGN
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