How many types of 3-D image processing techniques are there in image perception? A. 3 B. 4 C. 5 D. 6

There are 5 types of 3D image processing techniques in image perception:

1. Stereopsis is the process of using binocular vision to perceive depth. It works by comparing the images from each eye to create a 3D image of the scene.
2. Motion parallax is the apparent change in the position of objects as they move relative to the viewer. It can be used to perceive depth by comparing the positions of objects in two consecutive images.
3. Texture gradients are changes in the brightness or color of an image that can be used to indicate depth. For example, a road that is closer to the viewer will appear to have a steeper texture gradient than a road that is further away.
4. Shading is the variation in brightness of an object due to the way that light hits it. It can be used to perceive depth by comparing the brightness of different parts of an object.
5. Occlusion is the partial or complete hiding of one object by another. It can be used to perceive depth by identifying which objects are in front of and behind each other.

These techniques can be used to create 3D images from 2D images, or to enhance the perception of depth in 3D images.