can,anyone provide me code for auto cropping and normalization of this image?pls..its urgent

[Shubham Agrawal]

yes,line has to crop also.. it is giving this error....

??? Undefined function or method 'bwconvhull' for input arguments of type 'char'.

Error in ==> Untitled at 15 binaryImage = bwconvhull(binaryImage, 'union');

pls fix it...also provide code for normalization

Answer 1

[Image Analyst]

Is the line on the left supposed to be in the cropped output? Assuming not, just crop that off.

grayImage = grayImage(:, 50:end);

Then threshold, take convex hull, label, call regionprops, and call imcrop. Here is some untested code.

binaryImage = grayImage < 128;
binaryImage = bwareaopen(binaryImage, 400); % Get rid of small specks.
binaryImage = bwconvhull(binaryImage, 'union');
measurements = regionprops(logical(binaryImage), 'BoundingBox');
boundingBox = measurements(1).BoundingBox;  % Maybe the (1) is unnecessary???
croppedImage = imcrop(grayImage, boundingBox);

If that doesn't work and you can't figure out how to fix it, then post your code and screenshots, otherwise please mark the Answer as "Accepted".

[Shubham Agrawal]

yes,line has to crop also.. it is giving this error....

??? Undefined function or method 'bwconvhull' for input arguments of type 'char'.

Error in ==> Untitled at 15 binaryImage = bwconvhull(binaryImage, 'union');

pls fix it...also provide code for normalization

[Image Analyst]

What does

>> which bwconvhull

say? Maybe you have an antique version of MATLAB, before that function was introduced. If so, you can upgrade (best option), or (sub-optimal option) you can sum the image horizontally and vertically to get the vertical and horizontal profile then threshold and use find() to find the starting and ending rows, and crop that way.

You didn't attach your code like I specifically asked, forcing me to do everything. OK, I did it all for you. I attached the code below the image it creates.