Image detect and convert white image

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윤주 황
윤주 황 2022-5-30
评论： Walter Roberson 2022-5-30
I want to convert like this,,,, detect image and convert in to whole white, because i have to count white pixels

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回答（3 个）

Walter Roberson
Walter Roberson 2022-5-30
Ran in:
filename = 'https://www.mathworks.com/matlabcentral/answers/uploaded_files/1015940/image.png';
img = imread(filename);
negmask = all(img > 240, 3);
mask = ~bwareafilt(negmask, 1);
imshow(mask)
area = nnz(mask)
area = 173456
  1 个评论
Walter Roberson
Walter Roberson 2022-5-30
The 240 that I chose was arbitrary. When I filtered for any component < 240, a small number of small dots were left near the lower right of the object. The bwareafilt is used to select just the largest area, discarding the small dots.

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KSSV
KSSV 2022-5-30
Ran in:
I = imread('https://in.mathworks.com/matlabcentral/answers/uploaded_files/1015935/test.png') ;
I1 = rgb2gray(I) ;
I2 = ~imbinarize(I1) ;
imshow(I2)
Matt J
Matt J 2022-5-30
编辑：Matt J 2022-5-30
Ran in:
A=imread('https://www.mathworks.com/matlabcentral/answers/uploaded_files/1015940/image.png');
imshow(any(250-A,3))

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