MATLAB: How to Threshold Crop an Image for analysis

digital image processingimageimage acquisitionimage analysisimage processingimage segmentationmathematicsMATLABmatricesmatrixmatrix arrayvideo processing

Basically all I want to do is perform a lighting analysis on the hair itself in the border i set for it (blue tape). Is there a way I can crop this using some sort of color threshhold? the picture setup should be consistant everytime (i dont want to have to bother w imcrop(). Here is the image:

Best Answer

Maybe simple binarization?

I0 = imread('image.jpeg');
I1 = I0(:,:,3);
I2 = im2bw(I1,graythresh(I1)-0.1);
imshowpair(I0,I2,'montage')

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MATLAB: I had apply morphological processing on an image that is close. i want to color the white part of the binary image that is processed to green. how can i do that

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clc;
clear all;
close all;
global I2;
I1 = imread('imm2.jpg');
I2 = imresize(I1,.5);
img_gray=255-(0.3*I2(:,:,1)+0.6*I2(:,:,2)+0.11*I2(:,:,3));
level=graythresh(I2);
BW1=im2bw(I2,level);
BW= imcomplement(BW1);
se=strel('square',11);
close_img=imclose(BW,se);
color_level= [1 255 1]; 
color_img=bsxfun(@times,double(close_img),permute(color_level,[1 3 2]));
RGB=uint8(color_img-(color_img==0).*255); 
imshow(RGB);

MATLAB: Trying to automatically crop an image into several smaller images based on segmentation

Something like this

clc,clear
I = imread('image.jpeg');
I1 = im2bw(I);
I2 = imdilate(I1,ones(5));      % imdilate to close contours
I3 = imerode(I2,ones(4));       % restore thickness
[L,n] = bwlabel(I3);            % label regions/areas
subplot(121)
imshow(I2)
title('imdilate')
subplot(122)
imshow(I3)
title('restore thickness of contours')
figure
for i = 2:n
    I4 = L==i;                      % select region
    I5 = imfill(I4,'holes');        % fill contour/region
    imshow(cat(3,I5*255,I3*255,I3*0))   % display
    pause(1)
end

Best Answer

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MATLAB: I had apply morphological processing on an image that is close. i want to color the white part of the binary image that is processed to green. how can i do that

MATLAB: Trying to automatically crop an image into several smaller images based on segmentation

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