Image processing apparatus and method

The present disclosure relates to an image processing apparatus and a method capable of performing on-line sensing without synchronizing and without using a specialized device. An image corner corresponding point detection unit detects an image corner of an input image from a captured image captured by a camera, and associates four image corner points of a corrected image to be projected by a projector with four image corner points of the detected captured image, thereby detecting four image corner corresponding points. An attitude estimation unit estimates a relative attitude of the projector and the camera from the four image corner corresponding points. The present disclosure can be applied to, for example, a projection imaging device that projects an image with a projector, captures the image projected by the projector, and updates a presentation position.