Displacement detection device and displacement detection method thereof

Abstract

The invention relates to a displacement detecting method, which comprises the following steps of capturing an image frame and calculating a characteristic index of the image frame. When the characteristic index is larger than a threshold value, a set pattern is added to the image frame. The invention also provides a displacement detector. According to the invention, the set pattern is added to the captured image frame to increase the characteristic change of the image frame, thereby increasing the tolerance and the shake resisting capability of a working surface of the displacement detector.

Description

technical field [0001] The invention relates to a displacement detection device, in particular to a displacement detection device with high working surface tolerance and displacement detection accuracy and a displacement detection method thereof. Background technique [0002] The existing optical mouse usually includes an image sensor and a processing unit. The image sensor captures multiple images of a work surface at different sampling times, and the processing unit compares the correlation between the multiple images. , to calculate the displacement of the optical mouse relative to the work surface. The control unit relatively controls the movement of the cursor displayed on the display according to the displacement outputted by the optical mouse. [0003] When the optical mouse is operated on a critical surface, since the characteristic changes of the image captured by the image sensor are too subtle (for example, the contrast or the gray scale value change is too low),...

AI Technical Summary

Problems solved by technology

When the threshold value is high, although the situation of cursor jitter can be reduced, the working surface used to operate the optical mouse must have obvious characteristic changes, thus increasing the limit of the operable working surface; when the threshold value is low, although An optical mouse has a lower limit on the work surface it can operate on, but the cursor jitter is more noticeable

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