Patent ID: 11877103
Assignee: ALI CORPORATION
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 0:
1. A projection picture correction method adapted for a projection device, comprising:
obtaining a plurality of target coordinates of a plurality of target vertexes based on a plurality of planes of a projection surface when a projection device performs projection toward the projection surface, wherein the plurality of planes are not coplanar with each other, and the plurality of target vertexes form a target polygon;
performing a first direction scaling process respectively on a plurality of first image portions of an original rectangular image and generating a trapezoidal image block, wherein the step of performing the first direction scaling process respectively on the plurality of first image portions of the original rectangular image and generating the trapezoidal image block comprises:
obtaining a plurality of first trapezoidal boundaries respectively corresponding to the plurality of first image portions according to a predetermined image boundary and a first coordinate component of each of the plurality of target coordinates; and
performing the first direction scaling process on the plurality of first image portions respectively according to the plurality of first trapezoidal boundaries and generating the plurality of second image portions, wherein the trapezoidal image block comprises the plurality of second image portions;

performing a second direction scaling process respectively on a plurality of second image portions of the trapezoidal image block and generating a target image block aligned with the target polygon, wherein the step of performing the second direction scaling process respectively on the plurality of second image portions of the trapezoidal image block and generating the target image block aligned with the target polygon comprises:
respectively extending two edges of the target polygon until the two edges intersect two reference line segments and obtaining two second trapezoidal boundaries, wherein a bottom edge of the trapezoidal image block is perpendicular to bottom edges of the two second trapezoidal boundaries; and
performing the second direction scaling process on two of the plurality of second image portions respectively according to the two second trapezoidal boundaries to generate two sub-target image blocks, wherein the target image block comprises the two sub-target image blocks; and

projecting an output image comprising the target image block onto the projection surface.