Abstract
The invention provides an image signal acquiring method against high illumination reverse effect generated by sensing apparatus, which in sequence acquires a voltage value acquisition procedure after exposure that obtains the voltage value after a period of exposure time; the initial voltage acquisition procedure after exposure that obtains an initial voltage after an adjustable exposure time; and an image signal acquisition procedure that obtains a corresponding image signal by subtracting the voltage value after exposure from the initial voltage value at the start of the exposure. By means of the fact that when increasing the received light signal intensity during exposure, the high illumination reverse effect incurred can be prevented to enhance the correctness of image signal by relatively lowering the adjustable time.