Device and method for measuring scene depth

Abstract

The invention provides a device and a method for measuring scene depth. The device comprises a camera shooting part, a data processing part and an interface control part. The method comprises the steps of firstly utilizing a calibrated camera to acquire a first defocusing image at the uncertain depth, and then adopting a camera which is parallel to the calibrated camera and has the same parameters to acquire a second defocusing image at a different depth position, wherein the change of the depth causes the change of the defocusing degree of the image; establishing the corresponding relation of a point spread function according to different scattering degrees in the two images, and establishing a depth mapping relation according to the corresponding pixel coordinate; and finally estimating the actual scene depth and estimating the two-dimension sizes such as the height and the width of an object. According to the invention, measurement on the distance and size of the object in the scene in a complex environment can be realized without using a mechanical motion part or measuring information of parameters of the camera, thereby bringing convenience for implementers, and being applicable to the field of security protection of squares, bulk warehouses, markets, airports and traffic management.

Description

technical field [0001] The invention relates to a distance measuring device and method, in particular to a scene depth measuring device and method. Background technique [0002] The current defocus depth recovery method is based on the corresponding relationship between the blur degree and depth of different defocused images, and processes the obtained image information with different blur degrees. This process needs to change camera parameters to obtain images, but it is very difficult to obtain camera parameters in actual use. If the parameters of the camera are kept unchanged during the process of recovering the depth from defocus, it will be very convenient for the implementer. [0003] Currently related patent documents are disclosed including: Chinese invention patent CN102223477A (published on October 19, 2011) discloses a four-dimensional polynomial model for depth estimation based on two-image matching, which is used to estimate object distance and focus adjustment...

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned patents either need to estimate the camera parameters on site, or need special instruments such as infrared range finders to assist in measuring the depth of the scene, and the measurement accuracy of the solution based on a general-purpose camera is not ideal

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