Error while using rgb2gray

1 次查看（过去 30 天）

Febin Benjamin 2013-7-14

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/82001-error-while-using-rgb2gray

I m trying to accept series of color images and apply edge function on them. this is my code....

if true
for k = 1:10
   tifFilename = strcat( num2str(k), '.tif');
   [X,map] = imread(tifFilename);
   gmap = rgb2gray(map);
   BW = edge(gmap,'sobel');
   figure, imshow(BW);
end
end

it shows the following error

??? Error using ==> rgb2gray>parse_inputs at 82 MAP must be a m x 3 array.

Error in ==> rgb2gray at 35 X = parse_inputs(varargin{:});

Error in ==> sequenceimageprocessing at 6 gmap = rgb2gray(map);

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Image Analyst 2013-7-14

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/82001-error-while-using-rgb2gray#answer_91721

在 MATLAB Online 中打开

Color images don't have a colormap. Try this

fontSize = 20;
for k = 1:10
   tifFilename = sprintf('%d.tif', k);
   if ~exist(tifFilename, 'file')
      fprintf('%s not found.\n', tifFilename);
      continue;
   end
   rgbImage = imread(tifFilename);
   grayImage = rgb2gray(rgbImage );
   BW = edge(grayImage ,'sobel');
   subplot(2,2,1);
   imshow(rgbImage);
   title('Color Image', 'FontSize', fontSize);
   subplot(2,2,2);
   imshow(grayImage );
   title('Grayscale Image', 'FontSize', fontSize);
   subplot(2,2,3);
   imshow(BW);
   title('Binary Edge Image', 'FontSize', fontSize);
end