Displacement detection device

摘要

A displacement detection device includes a light source, an image sensor and a processing unit. The light source is configured to illuminate a work surface. The image sensor is configured to capture reflected light from the work surface and to output an image frame. The processing unit is configured to select a window of interest in the image frame having a maximum image feature and to calculate a displacement of the displacement detection device according to the window of interest.

主权项

1. A displacement detection device, comprising:
a light source configured to illuminate a work surface in a projection direction; an image sensor comprising an image sensing matrix having a rectangular shape and configured to capture reflected light from the work surface and to successively output image frames; and a processor configured to respectively select at least one window of interest in the image frames and to calculate a displacement of the displacement detection device according to the window of interest in two of the image frames, wherein the at least one window of interest is a partial pixel range in each of the image frames, and remaining pixel ranges in the image frames outside the at least one window of interest are not used in calculating the displacement, and wherein the at least one window of interest is selected corresponding to a first position of the image sensing matrix according to reflected light from a first work surface and the at least one window of interest is selected corresponding to a second position of the image sensing matrix according to reflected light from a second work surface, and the first position is changed to the second position along a length direction of the image sensing matrix when the first work surface is changed to the second work surface, wherein the first position is different from the second position, and the first work surface is different from the second work surface.