Error while using rgb2gray
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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);
采纳的回答
Image Analyst
2013-7-14
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
更多回答（1 个）
Azzi Abdelmalek
2013-7-14
Maybe your image is not RGB, check
size(X)
7 个评论
Febin Benjamin
2013-7-14
编辑：Febin Benjamin
2013-7-14
Azzi Abdelmalek
2013-7-14
In windows Matlab command, just to check if your image is nxmx3
Febin Benjamin
2013-7-14
Azzi Abdelmalek
2013-7-14
编辑：Azzi Abdelmalek
2013-7-14
Nothing, your image is already grayscale
Febin Benjamin
2013-7-14
编辑：Febin Benjamin
2013-7-14
Azzi Abdelmalek
2013-7-14
Have you the same error message with this case?
Azzi Abdelmalek
2013-7-14
编辑：Azzi Abdelmalek
2013-7-14
[X,map] = imread(tifFilename)
Check if map is nx3 array
then write
gmap = rgb2gray(map);
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2013-7-14
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