How to plot histogram of multiple images in a for loop and save them in different figures?

Hello,

I have 20 images in a directory. I want to plot histogram for each image in a for loop and then store the histogram (each in a seperate figure) in a folder. This is the code that I wrote but it does not generate histogram.Could you guide me how to do that?

Thanks

srcFile = dir('./Registered_to_1_Metastatic8 copy 2/*.jpg');
for k = 1 :length(srcFile)
    nextFilename = strcat('./Registered_to_1_Metastatic8 copy 2/',srcFile(k).name);
    next_An_Img = imread(nextFilename);
    An_gray_Img = rgb2gray(next_An_Img);
     figure
     imshow(An_gray_Img )
     figure
     h = imhist(An_gray_Img );
     imwrite(h,['histo' num2str(k) '.jpg'],'jpg');
end

[KSSV]

For logicals you will not get histgogram......... you have only 1's and 0's. Think what you want for histogram.

[Penny13]

My mistake. I edited the program, but still doesnt work. I want histograms of all grayscale images in the folder.

[KSSV]

Wait for some time....if your images are huge..it will take some time to get plotted.

srcFile = dir('./Registered_to_1_Metastatic8 copy 2/*.jpg');
for k = 1 :length(srcFile)
    nextFilename = strcat('./Registered_to_1_Metastatic8 copy 2/',srcFile(k).name);
    next_An_Img = imread(nextFilename);
    An_gray_Img = rgb2gray(next_An_Img);
    figure
    imshow(An_gray_Img )
    figure
    imhist(An_gray_Img );
    %   imwrite(h,['histo' num2str(k) '.jpg'],'jpg');
    saveas(gcf,['histo' num2str(k) '.jpg'])
end

[Penny13]

Thank you so much. It worked. Your answered this question in the comments section not in the Answers , so I could not figure it out how to accept the answer.

[KSSV]

I have given in answer now.

Answer 1

[KSSV]

Wait for some time....if your images are huge..it will take some time to get plotted.

srcFile = dir('./Registered_to_1_Metastatic8 copy 2/*.jpg');
for k = 1 :length(srcFile)
    nextFilename = strcat('./Registered_to_1_Metastatic8 copy 2/',srcFile(k).name);
    next_An_Img = imread(nextFilename);
    An_gray_Img = rgb2gray(next_An_Img);
    figure
    imshow(An_gray_Img )
    figure
    imhist(An_gray_Img );
    %   imwrite(h,['histo' num2str(k) '.jpg'],'jpg');
    saveas(gcf,['histo' num2str(k) '.jpg'])
end

Answer 2

[mehedi Hasan]

Hello,

I have 20 images in a folder. I want generate histogram for these 20 image (single histogram for 20 images).Could you guide me how to do that?

Thanks