how can i select a specific color threshold in a image?
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i'm trying to select all the black pixels of some white-black tiff images. I have the code below:
fontSize = 20;
imagefiles=dir('*.TIF');
nfiles=length(imagefiles);
a1=imread('a1.TIF');
[rows1 columns2 numberOfColorBands3] = size(a1);
totalNumberOfPixels1 = (rows1 * columns2)*nfiles;
for i = 1:nfiles
grayImage=imagefiles(i).name;
currentimage=imread(grayImage);
figure;
[rows columns numberOfColorBands] = size(grayImage);
subplot(2, 2, 1);
imshow(currentimage)
title('Original Grayscale Image', 'FontSize', 20);
[pixelCount grayLevels] = imhist(currentimage);
subplot(2, 2, 2);
bar(pixelCount);
title('Histogram of original image', 'FontSize', fontSize);
xlim([0 grayLevels(end)]); % Scale x axis manually.
binaryImage = currentimage > 25;
subplot(2, 2, 3);
imshow(binaryImage, []);
title('Binary Image', 'FontSize', fontSize);
numberOfBlackPixels = sum(binaryImage == 0);
numberOfWhitePixels = sum(binaryImage);
percentBlackPixels = 100.0 * numberOfBlackPixels/totalNumberOfPixels1;
percentWhitePixels = 100.0 * numberOfWhitePixels/totalNumberOfPixels1;
end
T = table(numberOfBlackPixels,numberOfWhitePixels,percentBlackPixels,percentWhitePixels);
T(1,:)
filename = 'results_neri_187_1.xlsx';
writetable(T,filename,'Sheet',1,'Range','D1')
With this code i can only select the real black pixels. I need to look at the histogram and select all the black and also some dark gray, but i have to assess it each time. How can i select a threshold of colors in matlab and add it in this code?
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