i need to find the dark spot in this image which is the first minimum of the pattern.(pattern is sinc funtion in y -axis)

[AADITYA DARAKH]

I need to figure out the o-ordinates of the firsmt min'm dark point

this is a 16 bit image , and the code to get the image is as follows;

o=170

C=imread("cameraman.tif");

h=fspecial("motion",15,o);

z=imfilter(C,h);

C=fft2(z);

C=fftshift(C);

C=abs(log(1+C));

R=radon(C);

%imtool(R)

%R(1:140,:)=2500;

%R(220:367,:)=2500

%R=edge(R,"canny",0.3)

imshow(R,[])

[AADITYA DARAKH]

this pattern varies depending on the value of o(angle), therfore finding the minimum, value is important.(first darkspot) in the pattern (sinc function).

Answer 1

[Image Analyst]

Try

minR = min(R, 'all')
[row, column] = find(R == minR)

[AADITYA DARAKH]

hey, thanks for responding, i want to make my question more clear . these co-ordinates depend on the value of o. i need a code which can detect these co-ordinates which are the first min'm value of the pattern shown in the previous picture.

[Image Analyst]

Looks like you're finding the brightest point.

minR = min(R, 'all')
maxR = max(R, 'all')
[rowMax, colMax] = find(R == maxR)

You might also like my attached radon demo.