Patent ID: 8523369

Claim:
A method for compensating light reflection of a projection frame, suitable for a projection apparatus, the method comprising: projecting a preset frame; detecting a reflected spectrum of a light reflected by the preset frame; and comparing the reflected spectrum with an original spectrum of the preset frame and adjusting a light characteristic value of the projected preset frame accordingly, so as to compensate a difference between the reflected spectrum and the original spectrum, wherein the step of adjusting a light characteristic value of the projected preset frame accordingly, so as to compensate a difference between the reflected spectrum and the original spectrum comprises the step of: adjusting a contrast of the projected preset frame, so as to compensate a contrast difference between the reflected spectrum and the original spectrum, comprising: respectively projecting a white frame and a black frame, and detecting a reflected light of the projected white frame and black frame, so as to obtain a first spectrum and a second spectrum; respectively accumulating a light intensity value of each of a plurality of frequencies in the first spectrum and the second spectrum, so as to obtain a first intensity value and a second intensity value; calculating a ratio of the first intensity value to the second intensity value to obtain a reference contrast, and comparing the reference contrast with a contrast threshold; and adjusting the spectrum of the projection frame when the reference contrast is lower than the contrast threshold, so as to increase the contrast of the projection frame.