Error using ==> rgb2gray>parse_inputs MAP must be a m x 3 array.
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![Error using ==> rgb2gray>parse_inputs MAP must be a m x 3 array.](/uploads/image/z/13322660-68-0.jpg?t=Error+using+%3D%3D%3E+rgb2gray%3Eparse_inputs+MAP+must+be+a+m+x+3+array.)
Error using ==> rgb2gray>parse_inputs MAP must be a m x 3 array.
Error using ==> rgb2gray>parse_inputs MAP must be a m x 3 array.
Error using ==> rgb2gray>parse_inputs MAP must be a m x 3 array.
就是说你要把一幅彩色的rgb图像转成灰度图,那么输入的必需是一个三维的矩阵,也只有三维矩阵才能是彩色的rgb图像