多参数亮度值重映射的颜色传递方法

Color transfer method of luminance remapping with multi-parameters

为了提高灰度图像中人眼视觉的情景感知和目标的识别率,提出了多参数亮度值重映射的颜色传递方法,将灰度图像赋予色彩。该方法首先将灰度目标图像和彩色参考图像由RGB颜色空间转换到亮度与色彩分离的YCbCr颜色空间。然后,引入由彩色参考图像和灰度目标图像的列数和亮度共同决定的参数,对彩色参考图像的亮度值进行运算,使彩色参考图像与灰度目标图像具有相同的亮度值动态范围。最后,根据目标像素和它周围的像素存在相关性,进行灰度目标图像与彩色参考图像的像素匹配后,将得到的结果再逆变至可以表示出各种色彩的RGB颜色空间。该颜色传递方法降低了色彩误传现象,提高了颜色传递的准确度并缩短了程序的运行时间。

In order to improve abilities of human vision for situation perceiving and the recognition rate of the targets in gray scale image, a color transfer method of luminance remapping with multi-parameters was proposed to colorize the gray scale image. First, the RGB color spaces of the gray scale target image and the color reference image were converted to the YCb Cr color space, in which the luminance value and color were separated. Then, the parameters which depended on the number of columns and luminance values of the color reference image and the gray scale target image were introduced. The luminance values of the color reference image were calculated to ensure the color reference image and the gray scale target image have the same range of luminance values. At last, according to the correlation of the neighborhood, each pixel of gray scale target image was matched with the pixel of the color reference image. The matched result was converted inversely to the RGB color space, which can represent a variety of colors. The occurrence of color misinformation is decreased in color transfer method of luminance remapping with multi-parameters. The accuracy degree of the color transfer is increased. At the same time, the running time of the program is reduced.