Automatic distortion correction method and apparatus using graphic processing chip

Abstract

The invention discloses an automatic distortion correction method and apparatus using a graphic processing chip. The method comprises the following steps: obtaining a motion three-dimension of a projector based on an acceleration sensor, and calculating an inclination angle of the projector relative to the original posture based on the motion three-dimension; calculating a trapezoidal distortion area of an image based on the inclination angle; extracting a maximum rectangular area in the trapezoidal distortion area; performing inverse operation based on the maximum rectangular area to obtain a mapping area corresponding to the original posture; and processing the mapping area of the original posture based on a linear interpolation method, and outputting the image through the correction of the image processing chip. The device is used for executing the corresponding method. According to the method disclosed by the invention, the offset angle of the projector is obtained by the acceleration sensor, the mapping relation of the projection after offset under the original posture is calculated by the offset angle, meanwhile the rectangular area in the trapezoidal distortion area is selected, the distorted image is corrected by a difference method to reduce the processing capability requirements to adapt to all kinds of projectors.

Description

technical field [0001] The invention relates to a method and device for automatically correcting distortion by using a graphics processing chip, belonging to the field of information processing. Background technique [0002] Usually, when the projector is projected onto the plane at a certain pitch angle, the projection surface will become trapezoidal. Now many micro-projectors use digital keystone correction to realize the vertical keystone correction function. The corresponding keystone correction makes the picture form a rectangle. [0003] The image processing chip uses matrix operation for processing through projection transformation, which has a relatively large amount of calculation and is not suitable for low-end products. At the same time, when facing high-resolution products, the corrected image will not match the resolution of the device. Contents of the invention [0004] In order to solve the above problems, the present invention provides a method and device ...

AI Technical Summary

Problems solved by technology

[0003] The image processing chip uses matrix operation for processing through projection transformation. The amount of calculation is relatively large, which is not suitable for low-end products. At the same time, when facing high-resolution products, the corrected image will not match the resolution of the device.

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