Distance measuring method and apparatus thereof

Abstract

The invention discloses a distance measuring apparatus and a distance measuring method. The distance measuring method comprises the following steps: a distance measuring optical signal is emitted on an object to-be-measured, wherein, the distance measuring optical signal comprises a pattern of at least one light spot; a distance measuring image formed by the distance measuring optical signal projected on the object to-be-measured is obtained, and the distance measuring image comprises a projection light spot formed by the distance measuring image projected by at least one light spot; when gravity centre of the distance measuring image is in a first section, the distance between the object to-be-measured and the distance measuring apparatus is calculated according to a first mapping relation, wherein the first mapping relation records several first reference gravity centre positions and several corresponding first reference distance reciprocals; when gravity centre of the distance measuring image is in a second section, the distance between the object to-be-measured and the distance measuring apparatus is calculated according to a second mapping relation, wherein the second mapping relation records several second reference gravity centre positions and several corresponding second reference distance. The method can simultaneously keep the distance measurement accuracy of long distance and near distance.

Description

technical field [0001] The invention relates to a distance measuring method and device, in particular to an optical distance measuring method and device. Background technique [0002] In the distance measurement, the existing optical sensing system adopts the same reciprocal mapping equation to calculate the distance no matter whether it is long-distance distance measurement or short-distance distance measurement. However, when the pixel resolution of the captured ranging image is insufficient, long-distance measurement will cause a large error due to the reciprocal characteristic. [0003] However, at present, many home appliances or other industrial equipment need to rely on the function of automatically identifying the distance from the surrounding environment. If the pixel resolution of the distance measurement image taken is insufficient, resulting A slight offset of the center of gravity, coupled with the characteristics of the reciprocal antipodal equation, will caus...

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Problems solved by technology

However, when the pixel resolution of the captured distance measurement image is insufficient, the long-distance measurement will cause a large error due to the reciprocal characteristic

[0003] However, at present, many home appliances or other industrial equipment need to rely on the function of automatically identifying the distance from the surrounding environment. If the pixel resolution of the distance measurement image taken is insufficient, resulting A slight offset of the center of gravity, coupled with the characteristics of the reciprocal antipodal equation, will cause a large error in long-distance measurement, which will easily cause damage to the equipment due to collision

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