A New Color-to-Gray Conversion Method Based on Edge Detection

In recent years, the line projection approach is popular and simple for the color-to-gray conversion. This paper presents a new line projection global mapping method based on edge detection. Firstly, we calculate the ratio of the number of each candidate gray image boundary points to the number of the color image’s. All the gray images are determined by exhaustive search method. Secondly, we choose the maximum ratio as the optimal line projection direction. The method proposed in this paper focuses on the edge information of the image. Experimental results show that the proposed method is superior to the typical other methods in terms of the images with obvious regional features.