how to execute varargin as a function?

how can I run this mfile on my image?

http://www.mathworks.com/matlabcentral/fileexchange/12275-extrema-m--extrema2-m

the image is in jpg format, when I use the first mfile which is extrema.m and is for time series, it gives me the error that (the entry must be a vector), and when I use the second mfile,extrema 2, I use these commands:

i=imread('..');
m=rgb2gray(i);
extrema2(m,varargin);
and it gives me this error :(

attempt to execute SCRIPT varargin as a function:
C:\Program Files\MATLAB\R2013b\toolbox\matlab\lang\varargin.m)

now how can I execute it as a function,or how can I run this mfile,is it true to use m instead of xy? It is extrema2(xy,varargin). thanx

Answer 1

[Image Analyst]

Don't pass in varargin. Pass in whatever it wants - images or whatever the instructions say to pass in.

[sara]

i tried this: i=imred('..'); m=rgb2gray(i); extrema2(m) this time gives no error,but no results either !but for the test image it worked vey nice and detect all extrema points,it was a surface,mine is a jpg,.

[Image Analyst]

I don't know what that algorithm does. It might have been tweaked and perfected for the types of images that it used as demo images. It's quite possible your images are different enough that the algorithm does not work for them. You might have to adapt the algorithm or use a different one.

[sara]

thank you,i also find 3 more mfile for extrema detection here,they work,but they only give me hundreds of numbers.i want something to show corners in the image,now i used harris corner detection and changed the selectstrongest until i find extrema corners,can i find the minimum or maximum corner among corners detected by harris?in each labeled image it detects some corners and i want to detect the one which is horizontaly min or max?thank you