Method for adjusting frame rate of photoelectric navigation device and photoelectric navigation device

A photoelectric navigation device, comprising:

• a memory, an image sensor, a processor and a computer program stored on the memory and executable on the processor, wherein the image sensor is configured to acquire an image frame, and the processor performs the computer program for:
• acquiring a first image frame and a second image frame by the photoelectric navigation device at a first frame rate, wherein an acquiring time of the first image frame is earlier than that of the second image frame, and the first frame rate is a current frame rate of the photoelectric navigation device;
• determining a current moving displacement of the photoelectric navigation device;
• determining a matching result of the first image frame and the second image frame when the current moving displacement is within a predetermined range between a high displacement threshold and a low displacement threshold;
• adjusting the first frame rate of the photoelectric navigation device to a second frame rate when the matching result does not meet a predetermined matching condition, indicating that the current moving displacement is erroneous, wherein the second frame rate is a frame rate of the photoelectric navigation device at a next moment, and the second frame rate is greater than the first frame rate;
• keeping the first frame rate of the photoelectric navigation device unchanged when the matching result meets the predetermined matching condition;
• and
• adjusting the first frame rate of the photoelectric navigation device to a third frame rate when the current moving displacement exceeds the high displacement threshold, wherein the third frame rate is a frame rate of the photoelectric navigation device at the next moment, and the third frame rate is greater than the first frame rate.