Can disparity range from negative to positive values for parallel cameras?

Yes, it is possible.

1. How to compute disparity for a pair of parallel stereo cameras?
2. Can disparity be negative?
3. How can you calculate disparity between two stereo images?
4. What is disparity in image processing?

How to compute disparity for a pair of parallel stereo cameras?

x = xl*z/f or b + xr*z/f y = yl*z/f or yr*z/f This method of determining depth from disparity d is called triangulation.

Can disparity be negative?

Disparity is measured in pixels and can be positive or negative (conventions differ). It will vary across the image. For two close cameras, side by side and pointing in the same direction, matching points are roughly on the same row in each image — the disparity is horizontal.

How can you calculate disparity between two stereo images?

Given a pair of stereo images, to compute the disparity map, we first match every pixel in the left image with its corresponding pixel in the right image. Then we compute the distance for each pair of matching pixels. Finally, the disparity map is obtained by representing such distance values as an intensity image.

What is disparity in image processing?

The disparity image is one where the value of each pixel is inversely related to the distance between that point in the scene and the camera.