I'm just getting started with OpenCV and I want to compare two similar images.There is just one difference between the two images.How could I capture the difference and get it's pixel like RGB or HSV.
Thanks a lot
Are those images identical, outside of this difference you are searching for? If yes, you can use != operator like this:
Mat binary_image = (your_image1 != your_image2);This will create image (called binary_image). Value of its pixel will be 0 your images are same in this pixel. If they are not the same then value of appropriate pixel will be 255.
If those images are not identical but only 'similar' the problem will be much more difficult.
I am not sure I understand what is "difference's original pixel". Do you mean that those images differ in exactly one pixel and you want to know its coordinates?
I think for these you need to scan through each pixel in the image and compare it. You can access pixel value using the below code
for(int i=0; i<img1->height; i++) //img1->height=img21->height
{
for(int j=0; j<img1->width; j++) //img1->width=img2->width
{
CvScalar ele1;
CvScalar ele2;
ele1=cvGet2D(img1,i,j);
ele2=cvGet2D(img2,i,j);
if(ele1.val[0]==ele2.val[0]) //Blue channel
// do some operation
if(ele1.val[1]==ele2.val[1]) //Green channel
// do some operation
if(ele1.val[2]==ele2.val[2]) //Red channel
// do some operation
}
}Hope these helpful.
Asked: Dec 4 '12
Seen: 3,566 times
Last updated: Dec 05 '12