No products are associated with this question.
what do you mean by direction of images. I hope you are talking about gradient value and direction (orientation) ?
I think you want to compute the SIFT right ?
Anyway to divide the image into blocks, you can use following tip
in case you have difficulty you can share your code.
To find the gradient magnitude and orientation, the following code may help you.
angle = 360;
[GradientX,GradientY] = gradient(double(img));
Gr = sqrt((GradientX.*GradientX)+(GradientY.*GradientY));
index = GradientX == 0; GradientX(index) = 1e-5;
YX = GradientY./GradientX;
A = ((atan2(GradientY,GradientX)+pi)*180)/pi;
A contains the orientation of each pixel.
How to compute gradient in three different directions? Can any one help me i need to compute the gradient in 3 different directions for an image please help me