Cutting images into parts

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How do I specify the Location by specified Pixel and select a particular Region?

case 0:
								
crop = img(Rect(0, 0, ((int)(img.cols / 2)), ((int)(img.rows / 2)))); // 
break;
case 1:
crop = img(Rect(((int)(img.cols / 2 + 1)), 0, ((int)(img.cols / 2 - 1)), ((int)(img.rows / 2))));
break;
case 2:
crop = img(Rect(0, ((int)(img.rows / 2 + 1)), ((int)(img.cols / 2)), ((int)(img.rows / 2 - 1))));
break;
case 3:
crop = img(Rect(((int)(img.cols / 2 + 1)), ((int)(img.rows / 2 + 1)), ((int)(img.cols / 2 - 1)), ((int)(img.rows / 2 - 1))));
break;

I wrote the cases to divide the image into 4 different parts, but it would be very hard to write for 64.

What I have tried:

I want to divide the 4 into 16 and then into 64, should i DEFINE each case specifically, if yes, how do I move around

Posted 7-Feb-20 3:46am

Member 14589606

Updated 7-Feb-20 11:10am

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Richard MacCutchan 7-Feb-20 10:21am

You need to refine your code to take the number of parts required and calculate the location and size for each part. It should be possible with a loop that is given the dimensions of the image, and the number of parts required.

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Rick York · Answer 1 · 2020-02-07T11:10:00

If you write one function to split a region into four pieces you can then use it to split a region as many times as you want. That is, to the limits of the data type you are using.

You are pretty much there already. You can simplify the code considerably if you calculate the half width and half height values first. Here is what that could look like :

C++

int halfhigh = img.rows / 2;
int halfwide = img.cols / 2;
switch( region )
{
case 0: crop = img( Rect( 0,            0,            halfwide, halfhigh ) ); break;
case 1: crop = img( Rect( halfwide + 1, 0,            halfwide, halfhigh ) ); break;
case 2: crop = img( Rect( 0,            halfhigh + 1, halfwide, halfhigh ) ); break;
case 3: crop = img( Rect( halfwide + 1, halfhigh + 1, halfwide, halfhigh ) ); break;
}