How to detect peaks in laser strip

http://www.fileconvoy.com/dfl.php?id=gd1cdd7d49d8ac46e171457f10603693890ad41

I = imread('1.jpg'); z = im2bw(I); skel = bwmorph(z,'skel',Inf); imshow(skel)

I want to detect middle of laser strip in image 1, called peak detection.. i tried thinning and morphological operations, but it exactly doesn't work and gives image 2.. I want single middle line.. So, which function or logic or code may be applied, please suggest me...

Answer 1

[Image Analyst]

I'd just scan down line by line, determining the center on a line-by-line basis. You could just threshold and determine the center that way, or, if it has a nice non-saturated profile, use something like a Savitzky-Golay filter (a sliding window polynomial fit, sgolay() is in the signal processing toolbox) to find the peak. The Signal Processing Toolbox also has a findpeaks() function. Then make groups where the column of the center doesn't move much from line to line. Then fit each group to a line with polyfit().

[Lalit Patil]

If i follow your first statement then i write a code that gives all centre points to me.. But, then how to create centre line image from it..!

And if i follow second statement then i got following image. http://www.fileconvoy.com/dfl.php?id=g1835684e61f18243171923475a58f31fdedd20 I think the space between the three different regions get filled, so this second can not be applied...

But still the problem is same.. How to create image from first solution.?

[Lalit Patil]

Ok... Now i understand the concept... In real i need only that middle points and saved it to text file, no need of image.. and i got it.. I have done same as per your first suggestion "scan down line by line" Thank you...

Answer 2

[Harshit]

It is not possible due to noise. Although if you just want a line use hough transform to get different lines and then select the biggest line.

[Lalit Patil]

If i do this, Image = imread('1.jpg'); bwImage = im2bw(Image); imshow(bwImage)

then the noise is removed, now i want to detect middle single straight line.. How can i do this..?