Stepped machine vision measurement correction module and correction method

Abstract

The invention provides a stepped machine vision measurement correction module and correction method. The correction module comprises a plurality of stepped planes with different heights, each steppedplane is provided with a plurality of patterns with a set size and a height identifier of each stepped plane, and the plurality of stepped planes form a correction pattern. The correction module further comprises a shooting platform, a correction module is arranged on the shooting platform, and an image acquisition device is arranged above the correction module. The correction module is placed onthe shooting platform, and the image acquisition device acquires a calibration image of a correction pattern on an upper side surface of the correction module. The pixel distance correction value of each pixel is calculated according to the actual size of the correction pattern and the number of pixels of a correction image in the calibration image. A pixel distance correction value correspondingto a to-be-measured object at a height is acquired according to the pixel distance correction value.

Description

technical field [0001] The invention belongs to the field of machine vision, and in particular relates to a step-shaped machine vision measurement correction module and a correction method. Background technique [0002] The existing measurement and correction templates for machine vision are generally black and white plane graphics. After collecting images of the black and white templates, the actual distance represented by the pixels is calculated. When measuring the actual object, the pixel value is converted to the actual distance. Size, to complete the measurement, this calibration method can only measure the object on the calibration plane, if the object deviates from the plane, it will cause a large error. [0003] In aquatic science research, machine vision technology is used to measure and analyze fish body length, body height, body width, and body surface characteristics. [0004] Existing machine vision measurement correction mainly relies on black and white squar...

AI Technical Summary

Problems solved by technology

For example, when using machine vision technology to take pictures of fish bodies, there is only one correction plane, and the thickness of each fish body is different, and the distance from the side of the fish body to the camera lens is different. When the side of the fish body deviates greatly from the original correction plane, its The error becomes unacceptable and the measurement fails

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