| 摘要 |
A method of selective color control of a digital video image, using a digital technique. The method features using simple Look-Up-Tables (LUTs), whose values are calculated from uniquely defined color control functions, to digitally change the saturation of a single color of the chromatic part of a video image without affecting saturations of the remaining colors of the chromatic part of the same video image. A digital video input image is scanned, row by row, pixel by pixel. Each input image pixel value, defined from the chromatic part of the video input image, is assigned an address to be operated on by values in individual color LUTs. For a desired change in an individual color of that image, a new digital video output image is produced featuring the desired change in the individual color without affecting the remaining colors of that same image. Application of this method to video images precludes the need to convert video components (e.g., YCrCb) into RGB (red, green, blue) components. Selective color control using this method enables viewers of video images to do two things currently not achievable using conventional methods of color control of video images. Firstly, to very accurately set or adjust individual colors of a given video image to the actual colors of the subject of the image, and, secondly, to very accurately modify or alter colors of a given video image to produce desired special effects in that video image. These capabilities of color control of video images are immediately applicable to the television and movie industries, where it is critically important for video images to represent actual colors of an image, and to have the capability of producing special effects to video images. |
