A keystone correction method and a projecting device

Abstract

The invention provides a keystone correction method and a projecting device. The method comprises: step 1, projecting a correcting auxiliary sample plate onto an imaging area; step 2, shooting the imaging area and obtaining a sample plate image; step 3, comparing an environment image with the sample plate image, determining location information of a feature pattern in the sample plate image, and storing the location information of the feature pattern in the sample plate image into a storage unit; step 4, judging whether four feature patterns able to form a correction reference quadrilateral exist in the location information of the feature pattern stored in the storage unit, and executing step 5 if the judgment result is yes, or returning to the step 1 if the judgment result is no; and step 5, executing keystone correction according to the four feature patterns. The keystone correction method and the projecting device ensure the problem in the process of keystone correction that an obstacle instantaneously interferes with a light path projected by the projecting device or that a picture projected by the projecting device is unideal will not affect the keystone correction of the projecting device.

Description

technical field [0001] The present invention relates to the field of projection devices, in particular to a trapezoidal distortion correction technology and a projection device capable of performing trapezoidal distortion correction. Background technique [0002] When the projection device projects an image to the imaging area, the relative angle between the plane where the projection device is located and the plane where the imaging area is located often causes trapezoidal distortion of the displayed image on the imaging area. In this case, the projection device passes The keystone correction technology can correct the keystone distortion of the displayed image. [0003] In the prior art, in order to realize the trapezoidal distortion correction of the displayed image, the projection device first projects a correction auxiliary template containing a special pattern onto the imaging area, then photographs the imaging area, and then determines the target imaging area accordin...

AI Technical Summary

Problems solved by technology

However, in the prior art, during the execution of keystone distortion correction, if an obstacle momentarily interferes with the optical path projected by the projection device, or the picture projected by the projection device is not ideal (for example, there is an interfering object in the projected picture), it will cause keystone distortion correction. fail

Images