Method for compensating light reflection of projection frame and projection apparatus

A projection apparatus, comprising:

• a projection unit for projecting a preset frame;
• a light sensor, for detecting a reflected spectrum of a light reflected by the preset frame;
• a transmitting apparatus, connected to the light sensor, for sending the reflected spectrum to the projection apparatus wirelessly or with wires;
• and
• a processing unit for comparing the reflected spectrum transmitted by the transmitting apparatus with an original spectrum of the preset frame and accordingly adjusting a light characteristic value of the projected preset frame, so as to compensate a difference between the reflected spectrum and the original spectrum, wherein the processing unit comprising:
• a calculation module for calculating a difference value between the reflected spectrum and the original spectrum of the preset frame;
• a comparison module for comparing the difference value with a threshold value;
• and
• an adjustment module for adjusting the light characteristic value of the preset frame projected by the projection unit when the comparison module determines the difference value exceeds the threshold value, so as to compensate the difference value between the light characteristic values of the reflected spectrum and the original spectrum of the preset frame, wherein the adjustment module comprising:
• a contrast adjusting tool for adjusting a contrast of the projected preset frame, so as to compensate a contrast difference between the reflected spectrum and the original spectrum, wherein the contrast adjusting tool comprising:
• controlling the projection unit to respectively project a white frame and a black frame;
• controlling the light sensor to detect a reflected light of the projected white frame and the black frame, so as to obtain a first spectrum and a second spectrum;
• controlling the calculation module to respectively accumulate a light intensity value 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;
• controlling the calculation module to calculate a ratio of the first intensity value to the second intensity value, so as to obtain a reference contrast;
• controlling the comparison module to compare the reference contrast with a contrast threshold;
• and
• adjusting the spectrum of the projected frame when the comparison module determines the reference contrast is lower than the contrast threshold, so as to increase the contrast of the projected frame.