Projection device and projection picture correction method thereof

The invention provides a projection device and a projection picture correction method thereof. When the projection device projects towards the projection surface, a plurality of target coordinates of a plurality of target vertexes are acquired based on a plurality of planes of the projection surface. The plurality of planes are not coplanar with each other, and the plurality of target vertexes form a target polygon. A plurality of first image parts of an original rectangular image are respectively subjected to first-direction scaling processing to generate trapezoidal image blocks. And performing second-direction scaling processing on a plurality of second image parts of the trapezoidal image block to generate a target image block which is aligned with the target polygon. An output image including the target image block is projected onto a projection surface. 本发明提出一种投影装置与其投影画面校正方法。当投影装置朝投影表面进行投影时，基于投影表面的多个平面获取多个目标顶点的多个目标坐标。前述多个平面彼此不共面，且前述多个目标顶点形成目标多边形。分别对原始矩形图像的多个第一图像部份进行第一方向缩放处理，而产生梯形图像区块。分别对前述梯形图像区块的多个第二图像部