how to get black & white pixels count from grayscale image...???

15 Ansichten (letzte 30 Tage)
Drashti
Drashti am 1 Mai 2014
Kommentiert: Image Analyst am 26 Okt. 2018
input image is grayscale image. how can i get black & white no. of pixels

Antworten (1)

Nitin
Nitin am 1 Mai 2014
black corresponds to zeros in your image and white corresponds to ones if your image is double format.
I_double = im2double(img);
% Find black pixels
b = find(I_double==0);
% Find white pixels
w = find(I_double==1);
  2 Kommentare
EM geo
EM geo am 26 Okt. 2018
Bearbeitet: Image Analyst am 26 Okt. 2018
Does it do a count of white and black pixels?
Image Analyst
Image Analyst am 26 Okt. 2018
No it does not.
You'd have to do
numBlackPixels = numel(b); % Count the number of linear indexes returned.
numWhitePixels = numel(w);
For a uint8 image, you'd do
pureWhitePixels = grayImage == 255;
numberOfWhitePixels = sum(pureWhitePixels(:));
pureBlackPixels = grayImage == 0;
numberOfBlackPixels = sum(pureBlackPixels(:));

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