MATLAB: Finding the coordinates of points with maximum intensity

image processingImage Processing Toolboximage segmentation

i have a image file of a welded metal in jpg format. In the image ,the defect in welding appears as an object having maximum intensity.I need a code that can convert the coordinates having intensity above a certain given threshold to '1' and all other points below threshold to '0'. please help. thanks

Best Answer

If "I" is your intensity image and your threshold is stored in "thresh" pretty much all you need to do is:

mask= I>Thresh

Mask would have 1 for every pixel that has the intensity more than the threshold and the rest would be zero.

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MATLAB: How to calculate the background intensity of grayscale image

It depends. If you can, just snap an image without your foreground in there. Like if it's a hand in front of a white sheet, snap a photo of just the white sheet alone, without the hand in there. If you can't do that and need to estimate the background from the actual image, then try to identify the foreground and use some algorithm to fill in those pixels with background, like use regionfill(), or fit the whole background mask to a 2-D polynomical, or use some morphological methods, etc. You forgot to attach your image(s) so I can't really offer better advice.

MATLAB: Recognising/classify segmented objects in RGB image

Hello,

The following sample code will extract the segment of image that you could use for classification.

Here I assumed you wanted to threshold an RGB image and you are using grey scale intensity of the RGB image for Otsu’s thresholding.

colorImage= imread('peppers.png');
grayVersion = rgb2gray(colorImage);
 
thresholded = imbinarize(grayVersion); %Does thresholding by using Otsu’s method. 
thresholded(:,:,2) = thresholded; 
thresholded(:,:,3) = thresholded(:,:,1); 
colorImage(thresholded == 0) = 0; %Extract the color image with the threshold region alone

Best Answer

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