Patent ID: 7787062

Claim:
An image adjustment circuit suitable for a projection display, comprising: a parameter input unit, for providing a vertical axis amendment parameter and a horizontal axis amendment parameter; a data buffer unit, coupled to the parameter input unit for buffering the vertical axis amendment parameter and the horizontal axis amendment parameter; and a geometry transfer unit, for receiving input frame data with a plurality of pixels, wherein through the geometry transfer unit, the vertical axis coordinate of each of the pixels multiplies the vertical axis amendment parameter, thereby transferring each of the pixels to a new vertical axis coordinate, and the horizontal axis coordinate of each of the pixels multiplies the horizontal axis amendment parameter, thereby transferring each of the pixels to a new horizontal axis coordinate, wherein the vertical axis amendment parameter and the horizontal axis amendment parameter are determined by a linear regression equation of M coordinates of a plurality of pixel data, the M coordinates of the pixel data are sampled from the edge contour of the projection display.