Automatic color cast detecting method for reflecting scanner
An automatic detection and scanner technology, applied in TV, electrical components, image communication and other directions, can solve the problems of relying on manual operation, color cast detection cannot be quantitative, time-consuming and labor-intensive, etc.
Inactive Publication Date: 2013-09-11
XIAN UNIV OF TECH
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[0005] The purpose of the present invention is to provide an automatic detection method for color cast of reflective scanners, which solves the problem that the color cast detection of reflective scanners in the prior art cannot be quantified or can only rely on manual operation, which is time-consuming and labor-intensive.
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[0015] The present invention will be described in detail below with reference to the drawings and specific embodiments.
[0016] The automatic detection method for color cast of a reflection scanner of the present invention is specifically implemented according to the following steps:
[0017] Step 1. Collect IT8.7 / 2 color target
[0018] Scan the IT8.7 / 2 color target according to the color mode with the maximum optical resolution of the reflection scanner, and collect IT8.7 / 2 color target images, such as figure 1 Shown is a complete IT8.7 / 2 color target used in the embodiment and a schematic diagram of its gray-scale block area division;
[0019] Step 2. Create a lookup table for the conversion of Photoshop's RGB to Lab color space
[0020] In the RGB space, 11 levels of uniform segmentation are used to establish the color conversion lookup table from Photoshop's RGB to Lab. The segmentation nodes of R, G, and B are respectively set to 0, 25, 50, 75, 100, 125, 150, 175, 200, 225, 255, ...
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The invention discloses an automatic color cast detecting method for a reflecting scanner. The automatic color cast detecting method for the reflecting scanner includes steps of 1, acquiring IT8.7 / 2 color target; 2, setting an RGB (red, green and blue) of Photoshop to a color space conversion lookup table of a Lab; 3, dividing gray-scale block areas in color images of the IT8.7 / 2 color target; 4, calculating pixel average values R<->, G<->, B<-> of the gray-scale block areas; 5, judging and detecting color cast of the reflecting scanner, respectively judging the color cast and calculating the color cast in quantization in the RGB and the Lab color space of the Photoshop, and obtaining result of the color cast judgment of the reflecting scanner. By the automatic color cast detecting method, automatic detection of the color cast of the reflecting scanner is realized, and quality evaluation and correct selection and using of the reflecting scanner are facilitated.
Description
Technical field [0001] The invention belongs to the technical field of scanner quality detection, and relates to a scanner quality detection method, in particular to an automatic detection method for reflective scanner color cast. Background technique [0002] The reflection scanner is a digital input device of the computer. Its basic working principle is that the light source shines on the original, and the reflected light of the original is divided into three channels of R, G, and B through the R, G, and B color filters. The optical signal then undergoes photoelectric conversion, analog / digital conversion, and finally becomes a digital color image that can be processed by a computer. [0003] After the same original image is collected by different scanners, the color of the digital color image is not consistent with the original. Therefore, the evaluation of the quality of the scanner is indispensable, and the gray balance affects the color. It is very critical. If the scanner c...
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IPC IPC(8): H04N17/00H04N17/02
Inventor 胡涛张玲马冲聪范彩霞景翠宁
Owner XIAN UNIV OF TECH