Three-dimensional image sensing device and method of sensing three-dimensional images

A three-dimensional image sensing device, comprising:

• a light source for generating flashing light with a K multiple of a frequency of flicker noise or a predetermined frequency, wherein K is a positive real number, and the flicker noise is generated by an alternating current source;
• a sensing module, comprising:
• a pixel array for sampling the flashing light to generate a sampling result, wherein the sampling result comprises a plurality of first images during turning-on of the light source and a plurality of second images during turning-off of the light source;
• a control unit for executing an image processing on the sampling result to generate a spectrum corresponding to the sampling result;
• and
• a light source driver for driving the light source according to the K multiple of the frequency or the predetermined frequency;
• and
• a signal processing module coupled to the sensing module for generating the K multiple of the frequency according to the spectrum, and generating depth information according to the plurality of first images and the plurality of second images, wherein when the K multiple of the frequency is within a predetermined frequency range, the signal processing module outputs the K multiple of the frequency to the light source driver, or when the K multiple of the frequency is outside the predetermined frequency range, the signal processing module outputs the predetermined frequency to the light source driver.