Distance measuring method based on binocular fixed-focus cameras with different focal lengths

Abstract

The invention relates to a distance measuring method based on binocular fixed-focus cameras with different focal lengths. The method comprises the following steps: firstly, constructing a binocular distance measuring device; determining a calibration distance, calibrating a binocular overlapping region by taking the checkerboard as a reference object, judging the region where the temperature measurement target is located, performing distance calculation on a specific target in the binocular overlapping region based on a binocular imaging principle, and performing distance calculation on a specific target in a non-binocular overlapping region based on a triangular relationship. The distance measurement method has the advantages of high distance measurement precision, good robustness, low algorithm space time complexity, low occupied memory amount, short calculation time and the like; and the measurement range and the measurement distance of the binocular fixed-focus camera can be freelyconfigured and combined to be adjusted according to the focal length of the binocular fixed-focus camera, so that the equipment threshold of binocular distance measurement is reduced.

Description

technical field [0001] The invention belongs to the technical field of computer vision, and in particular relates to a ranging method based on binocular fixed-focus cameras with different focal lengths. Background technique [0002] During the outbreak of infectious diseases, thermal imaging temperature measurement has become an important measure for screening abnormal body temperature, and has made important contributions to the efficient monitoring of body temperature and the suppression of the spread of infectious diseases. However, the temperature measurement accuracy of thermal imaging temperature measurement equipment is significantly affected by environmental factors and temperature measurement distance, especially the influence of temperature measurement distance on temperature measurement accuracy is very large, resulting in most thermal imaging temperature measurement equipment at a fixed distance. The temperature measurement accuracy is still acceptable. Once it d...

AI Technical Summary

Problems solved by technology

Most of the current methods use fixed-focus cameras with the same parameters to be installed on the same plane. By calibrating the lens, the same target has only horizontal parallax on the left and right images, and then use the calibration results to perform stereo matching on the binocular images. Generate a depth image. This method has low cost and high precision, but it is limited by the fixed-focus lens. If the target is far away from the binocular camera, if a short-focus lens is used at this time, the target information is insufficient, which greatly reduces the measurement accuracy. , if you use a telephoto lens, although the information of the distant target can be obtained, the field of view is small, and the measurement range will also be reduced accordingly

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