Patent ID: 8545026

Claim:
A projector, comprising: a projection lens, an image capturing device, and a storage system; and one or more programs stored in the storage system and executable by at least one microprocessor, the one or more programs comprising: an initialization module operable to read a rectangular picture from the storage system, and control the projection lens to project the rectangular picture on a projection area; a row correction module operable to control the image capturing device to capture an image of the rectangular picture from the projection area when the projection lens moves by every trapezoid row correction grade, determine whether the captured image has trapezoid rows, and correct each trapezoid row of the captured image according to pixel coordinates of the first pixel point in each trapezoid row of the captured image if the captured image has trapezoid rows; and a column correction module operable to control the image capturing device to capture an image of the captured image from the projection area when the projection lens moves by every trapezoid column correction grade, determine whether the captured image has trapezoid columns, and correct each trapezoid column of the captured image according to pixel coordinates of the first pixel point in each trapezoid column of the captured image if the captured image has trapezoid columns.