MATLAB: How do i obtain a single pixel value in a grayscale image by clicking on it

grayscale valueguiImage Processing Toolboxpixel value

I have a GUI snd i need to obtain a pixel value of one of my images so i can set a threshold for segmentation. I only want one pixel value and want the user to click on the picture to find the specific value. Does ginput do this or is there something to ginput that i can use?

Best Answer

See my interactive thresholding app : http://www.mathworks.com/matlabcentral/fileexchange/29372-thresholding-an-image. It should work beautifully for all type of grayscale images - let me know if it doesn't. Other than that, use ginput() to get the column,row coordinates
[column, row] = ginput(1);
grayLevel = image(row, column);
or use impixelinfo() to get the gray level "live" as you move the mouse around over the image.
Related Question