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Skin color signal correcting method

A correction method and color-difference signal technology, applied in the field of image processing, can solve the problems of not considering the luminance signal, inconvenient for the real-time image processing system, not considering the influence of the luminance signal, etc.

Inactive Publication Date: 2007-07-25
SICHUAN CHANGHONG ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, many current algorithms only focus on processing the color difference signal itself, without considering the influence of the brightness signal, which leads to unsatisfactory processing effects on skin that is too bright or too dark, prone to plaques, etc., and cannot be processed according to the skin color. Adaptively correct the depth
The edge detection algorithm based on HSI space usually only detects the skin color area, does not perform skin color correction, and does not consider the influence of brightness signals on skin color, and involves complex mathematical calculations, so hardware implementation is very difficult and not easy to use in image real-time processing system

Method used

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  • Skin color signal correcting method
  • Skin color signal correcting method
  • Skin color signal correcting method

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specific Embodiment 1

[0035] Specific embodiment 1: input Y=80, Cb=101, Cr=145, because 16≤Y≤120, so Cb, Cr are carried out pretreatment, can obtain after Y=80 is substituted into the pretreatment formula:

[0036] m 1 = 108 + 10 × ( 120 - 80 ) 128 j 1 = 23 + 24 × ( 80 - 16 ) 128

[0037] n 1 = 154 - 10 × ( 120 - 80 ) 128 ...

specific Embodiment 2

[0047] Specific embodiment 2: input Y=223, Cb=106, Cr=136, because Y≥180, so carry out preprocessing to Cb, Cr, can obtain after Y=223 is substituted into the pretreatment formula:

[0048] m 2 = 108 + 10 × ( 223 - 180 ) 64 j 2 = 14 + 32 × ( 235 - 223 ) 64

[0049] n 2 = 154 + 22 × ( 223 - 180 ) 64 ...

specific Embodiment 3

[0059] Specific embodiment 3: input Y=23, Cb=89, Cr=165, because 16≤Y≤120, so Cb, Cr are carried out pretreatment, can obtain after Y=23 is substituted into the pretreatment formula:

[0060] m 1 = 108 + 10 × ( 120 - 23 ) 128 j 1 = 23 + 24 × ( 80 - 23 ) 128

[0061] n 1 = 154 - 10 × ( 120 - 23 ) 128 ...

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Abstract

The method comprises: inputting the brightness signal and color difference signal of an image to be corrected; according to the brightness value, making pre-processing for the color difference signal; deciding if the processed color difference signal is distributed in the skin tone range; if yes, correcting the skin color tone, and outputting the brightness signal and the corrected color tone signal; otherwise, directly outputting the inputted brightness signal and color difference signal.

Description

technical field [0001] The invention relates to an image processing method, in particular to a skin color signal correction method. Background technique [0002] ITU-R BT.601 is an international standard definition television (standard definition television, SDTV) image digitization standard, which is used to digitally encode TV images with 525 scanning lines and 625 scanning lines. The YCbCr color space is part of ITU-RBT-601, where Y is the luminance signal, defined as 8-bit binary data in the range of [16, 235], and Cb is the color difference signal, defined as 8 bits in the range of [16, 240] Binary data, Cr is the color difference signal, defined as 8-bit binary data in the range of [16, 240]. [0003] Skin color correction is becoming an important functional module in the video image processing chip. It can detect the skin color (bare skin) of the person in the image in real time, and correct it to make it closer to the real skin color of the person. In the YCbCr col...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N9/68H04N9/77
Inventor 吴达军
Owner SICHUAN CHANGHONG ELECTRIC CO LTD