how can i find pixel information(row and column)?

can i detect a pixel in an image,in this way:first i click on that specific corner or point,then it gives me the row and column it is located in,then i write another code,and search to find the pixel on that column and row,then make it red,cause some point of interest are not extrema corners either,.

Answer 1

[Image Analyst]

Try calling impixelinfo(). Then you can just mouse around the image and it will display the x,y and gray level or RGB values. To get or set values of some image array, you do that in your code. Once you've changed the array you have to call imshow() again to update the display with the new pixel values.