A Method and System for Four-Way Keystone Correction of Projectors Based on Pre-Mapped Two-Dimensional Arrays

By combining a pre-mapped two-dimensional array with a built-in angle sensor, the attitude angle is collected in real time and discrete step length calibration and interpolation calculation are performed, which solves the problems of high delay and low accuracy in projector dual trapezoidal distortion correction and achieves fast and high-precision projection correction.

CN122137943APending Publication Date: 2026-06-02HUIZHOU FACTORY JECKSON ELECTRIC CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HUIZHOU FACTORY JECKSON ELECTRIC CO LTD
Filing Date
2026-03-09
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing technologies suffer from high correction delay and low accuracy when dealing with dual trapezoidal distortion in projectors. They are also greatly affected by lighting conditions and image content, making it difficult to achieve fast and accurate correction.

Method used

By constructing a pre-mapped two-dimensional array before leaving the factory, collecting coordinate adjustment values ​​of various angle combinations, establishing mapping relationships and storing them in the storage module, and combining the built-in angle sensor to collect attitude angles in real time, performing discrete step length calibration and interpolation calculations, generating correction transformation parameters, and directly performing correction in the hardware circuit.

Benefits of technology

It reduces the amount of computation required by users, lowers the correction latency, improves correction accuracy and speed, and ensures that appropriate correction parameters can be obtained for any posture angle, generating a distortion-free standard rectangular image.

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Abstract

This invention discloses a four-way keystone correction method and system for projectors based on a pre-mapped two-dimensional array. The method includes the following steps: Before shipment, a two-dimensional discrete angle grid is constructed, and a pre-stored set of transformation parameters required to correct the trapezoidal distortion of the projected image to a standard rectangle under various angle combinations is collected to construct a pre-mapped two-dimensional array. During projector operation, the corresponding horizontal and vertical attitude angles are collected in real time for filtering, jitter reduction, and discrete step length calibration. Simultaneously, the array index is calculated, and the corresponding pre-stored transformation parameter set is read. If the angles do not perfectly match after discrete step length calibration and quantization, interpolation transformation is performed on the pre-stored transformation parameter sets corresponding to adjacent angle combinations obtained from the index, and the projected video stream corresponding to the projector is corrected to generate the four-way keystone correction result image. This invention enables automatic keystone correction in the vertical and horizontal directions of the projector.
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