MATLAB: How to increase or decrese graythresh value

graythreshMATLAB

rgb=imread('image1.jpg');
Igray=rgb2gray(rgb);
Ibw = im2bw(Igray,graythresh(Igray));
imshow(Igray);

Best Answer

store graythresh(Igray) in a variable and increase/ descrease as u want!

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MATLAB: How can i separate all the connected regions in a binary image and display them individually.

Use bwlabel() and ismember

[labeledImage, numRegions] = bwlabel(binaryImage);
props = regionprops(labeledImage, 'Area')
% Compute all the areas.
allAreas = [props.Area]
% Display each blob in its own figure.
for k = 1 : numRegions
    thisRegion = ismember(labeledImage, k);
    figure;
    imshow(thisRegion);
    drawnow;
end

MATLAB: Thin the boundary of objects of black & white images

Use imerode.

From Matlab documentation:

IM2 = imerode(IM,SE) erodes the grayscale, binary, or packed binary image IM, returning the eroded image IM2. The argument SE is a structuring element object or array of structuring element objects returned by the strel function.

Example:

Erode a binary image with a disk structuring element.

originalBW = imread('circles.png');  
se = strel('disk',11);        
erodedBW = imerode(originalBW,se);
imshow(originalBW), figure, imshow(erodedBW)

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Related Solutions

MATLAB: How can i separate all the connected regions in a binary image and display them individually.

MATLAB: Thin the boundary of objects of black & white images

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