Patent ID: 9723281
Date: 2017-08-01
CPC Classifications: H04N

Claim:
1. A projection apparatus comprising: a projection optical system configured to project projection light having a projection area onto an object; an output display device having a rectangular device area and being configured to modulate the projection light to generate a projection image; and a processor which executes a stored program to control operations of: wherein: in response to the comparator determining that the aspect ratio of the input image is larger than the aspect ratio of the output display device, the processor activates the projection area determination unit to perform the shifting operation such that the effective projection area is shifted toward an intersection of upper and lower sides, where pixel density is high, in a lateral direction, in response to the comparator determining that the aspect ratio of the input image is smaller than the aspect ratio of the output display device, the processor activates the projection area determination unit to determine the effective projection area in accordance with a first horizontal constraint such that an intersection of diagonals of the effective projection area and an intersection of diagonals of the projection area coincide with each other in the lateral direction, and the processor controls the projection area determination unit to perform the shifting operation such that the effective projection area in a vertical direction is shifted downward of the projection area when an optical axis of the projection light deviates downward of the projection area, and is shifted upward of the projection area when the optical axis of the projection light deviates upward of the projection area.