Limited Row and Column value of Images

I have three individual plane values of 208 images in three variables, and the size of each variable is 128*128. How to select the first 32 values of rows and 16 values of column from this variables?

[Jan]

The question is not clear. You have 3 variables, which are 128x128 matrices. What do you want to get? What are "the first 32 values of rows"? Is this a 128x32 matrix? Of are you looking for the 32x16 matrix in the upper left corner of the matrix?

[harjeet singh]

please upload the code

[Thorsten]

What's the size of a single image? If the size of each of the 208 images is 128*128*3, then the separated images of the three planes should be 128*128*208 for each of the three variables. I don't understand how three variables of size 128*128 can represent 208 images with three individual plane values. Please expand.

Answer 1

[Image Analyst]

So you have 208 color images with 3 planes each: red, green, and blue. Each original RGB image has 128 rows and 128 columns. Now you want to crop out the upper left 32 by 16 rectangular sub image. For each image, just use imcrop():

subImage = imcrop(thisRGBImage, [1, 1, 32, 16]);

Repeat for all 208 images.

[Raman kumar]

Thank you, Now i have applied sobel operator and getting accuracy as nearly 30% i want to increase it, how it can be done?

[Image Analyst]

You didn't say what algorithm you're using or how accuracy is determined, so I can't answer.