Distance measurement system applicable to different reflecting surfaces and operating method thereof
AssigneePixart Imaging Inc.
InventorsGuo-Zhen Wang, Chia-Yi Liu
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Abstract
There is provided an operating method of a distance measurement system including the steps of: successively capturing image frames with an image sensor; controlling a sampling parameter to converge an average brightness value of an object image in the image frames to be within a predetermined range; calculating a plurality of first object sizes of a converged object image in a converged image frame and calculating a first average value of the first object sizes; calculating a second average value of the first average values corresponding to a plurality of converged image frames; and comparing the second average value with a lookup table to determine an object depth.
Claims20
A distance measurement system, comprising:
- an image sensor configured to successively capture image frames;
- a sampling control module configured to control a sampling parameter to change an average brightness value of an object image of an object in the image frames to be converged within a predetermined range;
- a spatial filtering module configured to calculate a plurality of object sizes of the object image with the converged brightness value in a same image frame at first and then calculate an average value of the calculated object sizes;
- and
- a depth calculation module configured to compare the average value with a lookup table to determine an object depth of the object.
A distance measurement system, comprising:
- an image sensor configured to successively capture image frames;
- a sampling control module configured to control a sampling parameter to change an average brightness value of an object image of an object in the image frames to be converged within a predetermined range;
- a temporal filtering module configured to respectively calculate a second object size of the object image with the converged brightness value in each of a plurality of image frames captured at different times at first and then calculate a second average value of the calculated second object sizes;
- and
- a depth calculation module configured to compare the second average value with a lookup table to determine an object depth of the object.
An operating method of a distance measurement system, the distance measurement system comprising an image sensor, the operating method comprising:
- successively capturing image frames with the image sensor;
- controlling a sampling parameter to change an average brightness value of an object image of an object in the image frames to be converged within a predetermined range;
- calculating a plurality of first object sizes of the object image with the converged brightness value in a same image frame at first and then calculating a first average value of the calculated first object sizes;
- calculating a second average value of the calculated first average values corresponding to a plurality of image frames captured at different times and containing the object image with the converged brightness value;
- and
- comparing the second average value with a lookup table to determine an object depth of the object.
Dependencies are inferred from the claim text.