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Is anyone know how to find the brightest pixel from the image?

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sakurarandom

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Is anyone know how to find the brightest pixel from the image? I wish to find the coordinate of the laser dot in the image.

I found this information from internet but it doesn't help me at all.

% Assume I is the image you have with RGB values.
% Assume I is a matrix of [row,col, 3] of RGB values.
% First, convert it to HSI space

hsv = rgb2hsv(I);

%get the illuminance channel
v = hsv:),:,3);

%find the max pixel value
max_v = max(max(v));

% find the position of pixels having this value.
[r, c] = find(v == max_v);

% here, r are rows, c are columns.
 


Bassa, Thanks for your help. I am very appreciate it. However, I am using green laser..will it works?
 

Yes it may be work, I think try out one algorithm, and fine-tune for green color.
 

Do you understand its coding? I confuse on this part:

% calculate the midpoints of the area
if leftMost ~= xResolution && rightMost ~= 0
% both leftMost and RightMost have been updated

laserFound = true;
laserX = (leftMost + rightMost)/2;
laserY = (topMost + bottomMost)/2;
% top left: 172,101
% bottom right: 285,185
canvasLaserX = (laserX-172)*320/(285-172);
canvasLaserY = (laserY-101)*240/(185-101);

writefile(floor(canvasLaserX),floor(canvasLaserY)) ;
else
% unable to find laser
laserFound = false;
end


what do that canvaslaser for?
 

Thanks for your information, Bassa. I had email him and waiting his reply still.
 

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