外文翻譯---關(guān)于顏色識(shí)別中顏色特征分析的方法-展示頁(yè)
2024-11-14 08:06本頁(yè)面
【正文】 certain transforms. Below is the introduction of some color spaces and their conversions [7]. A. RGB Color Space Red (R), green (G), blue (B) are three primary colors ofspectrum. All colors can be generated by the sum of the threeprimary colors. In digital images, values of R, G and B rangefrom 0 to 255. A cube in threedimension coordinate space can be used to describe the RGB color space, where red, green andblue are the three axes, shown in Fig. main drawback of RGB color space as follows: ? It is not intuitive. It is difficult to see from the RGBvalues the cognitive attributes that the color representsitself. ? It is nonuniform. The perception difference betweentwo colors in RGB space is different from the distancebetween the two colors. ? It is dependent on hardware devices. In a word, RGB space is devicerelated and an inpleteintuitive color description. To overe these problems, othercolor spaces,which are more in line with characteristics of color vision, are adopted. RGB space can be mapped to other color spaces readily. 陜西科技大學(xué) 3 B. CMY(CMYK) Color Space CMY space is a spatial structure of a rectangular Cartesian. Its three primary ponents are cyan (C), magenta (M) and yellow (Y). Colors are obtained by subtractive colors. CMY space is widely used in nonemission display as inkjet printers. Equal amount of the three ponents can generate the black color. But the aforementioned black color is not pure. Generally speaking, to generate true black color, the fourth ponent, . black, is added in. This is the CMYK color space. CMY space is not very intuitive and nonlinear. Its three ponents are the plementary colors of R, G and B. The transformations are as follows: The transformations from RGB space to CMY space are as follows: 陜西科技大學(xué) 4 C. YUV and YCrCb Color Space YUV space and YCbCr space both generate a luminance ponent and two chrominance ponents. In YUV space, Y is the luminance ponent, U and V color difference. Y ponent is independent of the other two. Moreover, the YUV space can reduce the storage capacity required by digitalcolorful images by the characteristic of human vision. In YCbCr space, Y is the luminance ponent, Cb is the blue color ponent and Cr the red color ponent. Its advantages are obvious that color ponents are separated from luminance ponents and linear transformation can be performed from RGB space. Transformation from RGB space to YUV space can beexplained approximated by the following equations: D. HSI Color Space HSI space is established from the human psychologicalperception point of view. H (hue) is a color in a color corresponding to the main wavelength in chromatography. S (saturation) is equivalent to the purity of color. I (intensity ) is the brightness of color and the uniform amount of feeling. HSV (hue, saturation, value) and HSB (hue, saturation, brightness) are other color spaces similar to HSI color space , and are all belong to polar coordinate space structure. Their mon merit is that they can
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