MATLAB: How to count image binary

digital image processingimageimage processingImage Processing Toolboximage segmentation

Hi all

if i have binary image, how to calculate the white pixel, and black pixel?

Best Answer

Let's say input binary image is image_bw

result=bwareafilt(image_bw,1,'Largest');
count_w=sum(result);
fprintf('The white pixel count is: %d',count_w);

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MATLAB: Total area of a region of binary image

Huh? Of course you can use regionprops. No need to use bwboundaries() at all, unless you just want to show the outlines of the segmented areas in the overlay above your original gray scale or color image.

If you want the area of all the white pixels in your binary image you can do it two ways, with slightly different results because they use different calculation methods

pixelSum1 = bwarea(binaryImage);
pixelSum2 = sum(binaryImage(:));

If you want the area of each blob in the image individually, you can do it like this:

labeledImage = bwlabel(binaryImage);
measurements = regionprops(labeledImage, 'Area');
allAreas = [measurements.Area];  % List of all the blob areas.
totalAreaOfAllBlobs = sum(allAreas); % Will be the same as pixelSum2

MATLAB: With the grayscale image 150*100 how should I find out the number of text pixels(black) and background pixel (white)count I have used histogram but I can’t accurately predict the pixel count

Convert image into binary (suppose bw_image);

white_pixels_count=sum(bw_image(:));
black_pixel_count=(num_of_rows*num_of_col-white_pixels_count);

Another way-

num_pixels=numel(bw_image);
white_pixels_count=sum(bw_image(:));
black_pixel_count=(num_pixels-white_pixels_count);

Best Answer

Related Solutions

MATLAB: Total area of a region of binary image

MATLAB: With the grayscale image 150*100 how should I find out the number of text pixels(black) and background pixel (white)count I have used histogram but I can’t accurately predict the pixel count

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