Scanned image color cast automatic detection method

A technology for automatic detection and scanning of images, applied in image communication, electrical components, etc., can solve problems such as the inability to correctly and reliably detect the color shift of the image, the inability to accurately estimate the degree of color shift in the image, and the inability to quantify it

Inactive Publication Date: 2013-07-10
桂林澳群彩印有限公司
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Problems solved by technology

These algorithms have certain limitations. They cannot detect the color shift of the image correctly and reliably un

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  • Scanned image color cast automatic detection method
  • Scanned image color cast automatic detection method
  • Scanned image color cast automatic detection method

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Embodiment Construction

[0035] A scanning image color shift automatic detection method proposed by the present invention will be described below in conjunction with the accompanying drawings and specific embodiments.

[0036] The present invention selects the CIE L*a*b* uniform color space that has nothing to do with the equipment, converts the color mode of the scanned image into the L*a*b* color mode, and then counts the chromaticity average value and the average chromaticity center distance of the scanned image and color cast factor, etc.; finally, judge whether there is color cast in the image and the specific situation of color cast by analyzing and comparing with the standard chromaticity average value of the image without color cast.

[0037] please see figure 1 , a scanning image color shift automatic detection method of the present invention, comprises the following steps:

[0038] Step 1: Scan to obtain the image to be tested, and determine the standard image corresponding to the image to ...

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Abstract

The invention provides a scanned image color cast automatic detection method. When being scanned by a scanner, an image is easily affected by an ambient light source, reflecting characteristics of the image, photosensitive coefficients of collecting equipment and the like as to ensure that color cast exists in an obtained image through scanning. Even CIEL*a*b* color space having nothing to do with the equipment is selected through the method, then statistics are conducted on chrominance information, an average chrominance value, average chrominance center distance and color cast factors of the scanned image, and last, the chrominance information, the average chrominance value, the average chrominance center distance and the color cast factors are compared with a standard average chrominance value obtained by a typical standard non-color-cast image so as to judge whether color cast exists in the scanned image and specific color cast conditions. The scanned image color cast automatic detection method can accurately and automatically detect the color cast of the scanned image, is high in accuracy and reliability, and meanwhile can make certain evaluation to color cast degrees of the scanned image.

Description

technical field [0001] The invention belongs to the field of image quality detection and analysis, in particular to an automatic detection method for scanned image color shift. Background technique [0002] When the image acquisition equipment collects images, it is easily affected by the ambient light source, the reflection characteristics of the object itself, and the light sensitivity coefficient of the acquisition equipment, so that there is a deviation between the collected image color and the real image color, which is called image color cast. As the most widely used image acquisition equipment, scanners also have color cast in scanned images. Therefore, how to accurately detect the color shift of the image is a key prerequisite for correcting the color shift, and it is an urgent problem to be solved for the scanner to obtain high-quality scanned images. [0003] The degree of image color shift is one of the key indicators for evaluating the quality of digital images....

Claims

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Application Information

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IPC IPC(8): H04N1/60
Inventor 易尧华刘菊华苏海陈聪梅李帅袁媛
Owner 桂林澳群彩印有限公司
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