Method and device for automatically matching projection image with curtain area, and projector

Abstract

The invention discloses a method for automatically matching a projection image with a curtain area in the technical field of projectors, and the method comprises the following steps: firstly, making four binary square marks based on an ArUco library, and recording the ID of each mark, the size of the pure white image is the size of the original picture projected by the projection device, the method can automatically identify the curtain area and project the projection picture into the target area, so that the method can automatically adapt to curtains of various proportions, meanwhile, the requirement for the use environment is not high, and the method is suitable for popularization and application. The defects of an existing automatic trapezoid correction algorithm can be overcome. Besides, images are acquired only by the aid of a camera, additional hardware cost is not needed on the basis of hardware of an existing projector, relevant calibration is not needed when projection pictures are corrected, and operation is simple and fast.

Description

technical field [0001] The invention relates to the technical field of projectors, in particular to a method for automatically matching a screen area with a projected image. Background technique [0002] With the rapid development of the home smart projector market, its personalized demand is also increasing. However, the image projected by the projector is prone to trapezoidal distortion. In order to improve the user experience, automatic keystone correction technology is also developing rapidly. The automatic keystone correction technology needs to calibrate the sensor (image sensor or distance sensor) in the projector before use. When in use, the automatic keystone correction algorithm automatically calculates the distance between the projector and the target based on the information obtained by the sensor and the calibration parameters. The relative positional relationship of the curtain, and then calculate the correction parameters according to the positional relations...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for automatically matching the projection image to the screen area, so as to solve the existing automatic keystone correction technology proposed in the background art above, which is to correct the picture projected by the projection device into a fixed-scale rectangular picture, but this The trapezoidal correction technology has the following defects: First, this correction method requires a relatively high area for receiving the projected picture, because when the distance between the projector and the wall exceeds 250 cm, the size of the projected picture is close to 100 inches, providing such a large area. The cost of receiving projected pictures in the area is relatively high; second, the existing automatic keystone correction technology, the position of the corrected picture is calculated by an algorithm, and there is a certain randomness in the position. When the picture needs to be projected to the designated area, The existing trapezoidal correction algorithm cannot fully automatically project the picture to the target area; thirdly, the proportion of the picture corrected by the existing keystone correction technology is fixed. When the proportion of the target projection area is inconsistent with the corrected picture, it will affect the projector. The display effect problem

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