MATLAB: How to get pixel value of given point

image processingImage Processing Toolbox

I need to know how to get pixel value for given x and y coordination?

Best Answer

Right after you call imshow(), call

impixelinfo();

Look for a status line at the bottom left of your figure that will show you the current location and color of the image you're mousing over.

Or call imtool() with your image.

Related Solutions

MATLAB: How to get value of all pixel in grayscale image

You specify the row and column:

grayImage = imread(filename);
% Find intensity at row 5, column 39:
thisIntensity = grayImage(5, 39);
% or
thisIntensity = impixel(grayImage, 5, 39);

You might also like to mouse around over the image and see a "live" interactive readout of the x, y, and intensity. If so, do this:

hp = impixelinfo();

You can then place it where like by doing

hp.Position = [x, y, width, height];

MATLAB: Superimpose a coloured Marker on a tiff image

You got (the very badly named) ii and jj reversed. find() returns [rows, columns] which is [y, x]. You plotted ii,jj which is y,x, not x,y like you incorrectly assumed, so you're plotting the transpose. Don't worry, confusing row,column with x,y is a very very common mistake. Try this:

[rows, columns] = find(IM>4000);
plot(columns, rows, 'ro');

Or better yet, just create an image with red pixels instead of plotting circles in the overlay.

Best Answer

Related Solutions

MATLAB: How to get value of all pixel in grayscale image

MATLAB: Superimpose a coloured Marker on a tiff image

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