Automatic focusing system and method and projector

Abstract

The invention discloses an automatic focusing system and method and a projector, the automatic focusing system comprises a projection module, a motor module, a camera module and a processor. The processor is used for obtaining system calibration parameters, feature corners of preset patterns and images shot by the camera module, identifying a characteristic angular point from the image shot by thecamera, estimating an estimated distance between the projection wall surface and the projector according to the position of the characteristic angular point in the image shot by the camera, the position of the characteristic angular point in the preset pattern and the system calibration parameter, converting the estimated position of the focal plane according to the estimated distance, controlling the motor module to adjust the optical machine of the projection module to an estimated position and then adjusting the position of the optical machine according to the definition of the image shotby the camera module, so that the definition meets a set condition. The number of times of image definition detection can be reduced, and the focusing efficiency is improved. The method can be widelyapplied to the technical field of automatic focusing.

Description

technical field [0001] The invention relates to the technical field of automatic focusing, in particular to an automatic focusing system, method and projector. Background technique [0002] A projector is a device that projects an image onto a wall or screen through optical projection. Unlike a monitor, the size of the display area of ​​a projector is not limited by the size of the projector. Even a small projector can project a display area of ​​hundreds of inches. In scenarios that require a huge display area, projectors have become the preferred solution at a relatively low cost. [0003] In the past, when the projector was focusing, it was necessary to manually adjust the focus, which was inconvenient. Therefore, someone later installed a camera on the projector, and according to the image captured by the camera, it was determined whether the picture of the projector was clear, so as to realize automatic focusing. [0004] However, in the prior art, the adjustment of ...

AI Technical Summary

Problems solved by technology

In this way, it is necessary to test the picture clarity of all positions between the current position of the light machine and the target position of the light machine, especially when the distance between the target position and the current position of the light machine is relatively long, the number of picture sharpness detections is relatively small. Therefore, in these cases, the existing technology is more computationally intensive and less efficient

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