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Color correction method and integrated chip using same
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A color correction and color technology, applied in the direction of color signal processing circuits, etc.
Inactive Publication Date: 2011-08-24
WINTEK CORP
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[0004] For example, if the image is generated according to the definition of the sRGB standard color gamut, the grayscale data of each pixel is the X, Y that is expected to be received by the human eye , The Z stimulus value is a certain point in the sRGB color gamut, but because the size of the color gamut of the display itself or the three vertices of pure red, pure green and pure blue are different from the sRGB color gamut, when the image data is directly input On the display, the human eye will receive different X, Y, and Z stimulus values, thus causing the aforementioned image deviation problem
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Embodiment 1
[0033] This embodiment is described by taking the input image data defined by the sRGB standard as an example. This image data is converted to the CIE XYZ color space, wherein the eigenvalues (X, Y, Z) in the CIE XYZ color space are the three stimulus values to the human eye, which are also the grayscale values of the three primary colors of the image data (R, G, B) Displayed on the sRGB standard screen, the signal seen by human eyes.
[0034] In step S11, when converting the grayscale values of the three primary colors (R, G, B) of the image data into the eigenvalues (X, Y, Z) of the CIE XYZ color space, the grayscale values of the three primary colors (R, G, B) Convert to three primary color original luminance values (dR, dG, dB), and then convert the three primary color original luminance values (dR, dG, dB) to feature values (X, Y, Z). The color correction unit 130 converts the grayscale values (R, G, B) of the three primary colors into the original lu...
Embodiment 2
[0080] Then, as shown in step S65, according to the three characteristic values (Xr, Yr, Zr), (Xg, Yg, Zg), (Xb, Yb, Zb) of the device to be corrected and a color space conversion formula, as implemented The formula (12) in Example 1 converts the adjusted eigenvalues (X′, Y′, Z′) into adjusted luminance values (dR′, dG′, dB′) of the three primary colors. Next, as shown in step S66, measure the gamma characteristic curves of the device to be calibrated when each of the three primary colors is displayed, and model the measured gamma characteristic curves of the three primary colors to generate a new grayscale-brightness for each of the three primary colors relation.
[0081] Since steps S65 and S66 are the same as steps S14 and S15 in Embodiment 1, details are not repeated here. After the new grayscale-brightness relationship of the three primary colors is generated, the G-V curves of the red, green and blue color corrections can be obtained, such as Figures 7A to 7C sh...
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Abstract
The invention relates to a color correction method, which comprises the following steps: converting a tricolor gray-scale value of image data into a characteristic value of a color space; regulating the characteristic value according to the relationship of a coordinate position of standard white light defined by the color space and a coordinate position of the characteristic value defined in the color space, and the tricolor gray-scale value so as to generate a regulated characteristic value; measuring three characteristic values of tricolors respectively displayed on a device to be corrected; converting the regulated characteristic value into a brightness value after tricolor regulation according to the three characteristic values of the device to be corrected and a color space transformation equation; and measuring gamma property curves of tricolors respectively displayed on the device to be corrected, and modeling a respective gamma property curve of the measured tricolors to generate a respective new relationship of the gray scale and the brightness of the tricolors; therefore, a gray-scale value of the tricolors after regulation corresponding to the brightness value of the tricolors after regulation is acquired.
Description
technical field [0001] The present invention relates to a color correction method and an integrated chip with color correction function, and in particular to a color correction method applicable to a display or a projector and an integrated chip with color correction function. Background technique [0002] At present, various display technologies have matured day by day, especially devices such as monitors or projectors have been widely used in the market. How to present image colors more faithfully is one of the development priorities of many manufacturers. [0003] However, limited by the characteristics of the device, the same image may not have the same effect on different devices. Taking the display as an example, traditionally, when the display receives image data, the grayscale signal of the image data is directly stored in the random-access memory (RAM) of the display, and the grayscale signal is stored according to the gamma (Gamma) The voltage corresponds to the...
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