error on accessing images reading from sub folders.

Question

sidra Rafique 2018-9-13

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https://ww2.mathworks.cn/matlabcentral/answers/418837-error-on-accessing-images-reading-from-sub-folders

评论： sidra Rafique 2018-9-13

Hi, i need to access jpg images from subfolders, for that i have read this and modify it according to my hierarchy. https://www.mathworks.com/matlabcentral/answers/266223-read-image-from-different-folders

after reading images i need to convert those images to gray. for that i have used this

img_gray = rgb2gray(numberOfImageFiles);

at this line of code i am facing an error. which is given below:

Error using rgb2gray>parse_inputs (line 80)
MAP must be a m x 3 array.
Error in rgb2gray (line 52)
isRGB = parse_inputs(X);
Error in Untitled2 (line 34)
          img_gray = rgb2gray(numberOfImageFiles);

please help me in this. its just been a month i am using Matlab, still trying to learn it. waiting for your response. Thank You

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Answer 1

Guillaume 2018-9-13

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https://ww2.mathworks.cn/matlabcentral/answers/418837-error-on-accessing-images-reading-from-sub-folders#answer_336631

编辑：Guillaume 2018-9-13

Assuming that numberOfImageFiles is indeed the number of image files, why are you passing that to rgb2gray which expects an image and doesn't care at all how many you have?

You need to pass the image that you've loaded with imread to rgb2gray.