Object size high-precision measurement method based on depth camera

Abstract

The invention relates to the field of methods for automatically measuring the volume of an object, and particularly discloses an object size high-precision measurement method based on a depth camera,which comprises the following steps of: 1) acquiring a depth image of a measurement background in advance, and calculating to obtain a reference plane; 2) acquiring a depth image of the measured object, and positioning the depth image of the measured object to the position of the measured object in the image; 3) removing redundant transition data at the edge to further accurately obtain the position and the size of the measured object in the depth image; 4) projecting to the reference plane to obtain a projection image; 5) performing hole filling on the projection image; and 6) calculating toobtain the average height and the maximum height of the measured object, and converting to obtain the actual size of the measured object. According to the method, the volume of the object measured bythe depth map obtained by the depth camera under the semi-outdoor condition can obtain high-stability measurement precision, and meanwhile, measurement of the irregular object with the fluctuant surface is also supported.

Description

technical field [0001] The invention relates to the field of methods for automatically measuring the volume of an object, in particular to a method for measuring the size of an object with high precision based on a depth camera. Background technique [0002] In recent years, stereo camera products have emerged in an endless stream. These stereo cameras can be divided into two categories, passive stereo cameras and active stereo cameras. The passive type needs to be used in a bright environment and the surface texture of the measured object is clear, the depth measurement error is large, and it is not suitable for accurate measurement of the object volume. Active depth cameras are divided into dynamic and static. The dynamic ones generally need to cooperate with the conveyor belt, and the measurement accuracy is high, but the use cost is also high. The depth cameras suitable for static volume measurement can be divided into TOF cameras and structured light cameras in princi...

AI Technical Summary

Problems solved by technology

Then convert the length and width of the measured object according to the depth information and the size (proportion) of the measured object on the depth image. However, when the measured object is irregular and the upper surface has fluctuations, the average height is converted. There will be relatively large errors in length and width. At the same time, due to the low stability of the measurement volume of the depth camera under semi-outdoor conditions, it is easily affected by the lighting environment, and there are problems such as inaccurate capture of object edges, which will bring problems to the calculation of length and width. error

To sum up, although there are many types of 3D stereo cameras at present, each has its own advantages and disadvantages. It is necessary to select an appropriate camera according to the conditions of use, and equip it with an appropriate algorithm to avoid the shortcomings of the camera. It cannot meet the needs of small and medium-sized enterprises. Under the requirements of accurate measurement of package volume

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