Image Understanding

From eq. (3.153), it is clear that the depth of field increases with the decrease of D. If a larger blur disk is tolerated, a larger depth of field can be obtained by the lens with a shorter focal length than the lens with a longer focal length. On the other hand, using a lens with a long focal length will give a small focus of field. By measuring the focal length, the distance between the object and lens can be determined.

3.6Pose from Three Pixels

According to the principle of projection, one pixel in an image could be the projection result of a line in the 3-D space. To recover the pose of a 3-D surface from a 2-D image, some additional constraints are required. In the following, a simple method for computing the pose of an object from three ...