Uniform optimization method for illuminating LED array light sources for strip surface inspection

Abstract

The invention relates to the technical field of machine vision detection, and discloses a method of uniformly optimizing an illuminating LED array light source for strip steel surface detection. Camera parameters are used for calculating a strip steel surface illumination reference value, the illumination reference value and a target gray illumination reference value are compared, and the size of the light source is calculated according to field space requirements; and on the basis of the above illumination values and the light source size, intensity distribution and uniformity of the overall light source illumination are decided by the size of an LED array interval, the LED array is optimized, and then, an LED light source structure which can meet field actual requirements can be obtained. According to the uniform optimizing method of the invention, the light source can have a compact structure, the area of the uniform illumination is large, and a detected object image with a uniform gray can then be acquired.

Description

technical field [0001] The invention relates to the technical field of machine vision detection, in particular to an optimal design method of a uniformly illuminated LED array light source for steel strip surface detection. Background technique [0002] The core of the machine vision system is image acquisition and processing. All information comes from the image, and the quality of the image itself is extremely critical to the entire vision system. The light source is an important factor affecting the image level of the machine vision system, because the light source directly affects the quality of the input data and at least 30% of the application effect. Therefore, the success or failure of the light source and optical system design is the primary factor that determines the success or failure of the machine vision system. [0003] Due to the different properties, surrounding environment and detection requirements of the target to be detected, no light source can be effe...

AI Technical Summary

Problems solved by technology

Generally, the light source should be kept more than 2 meters away from the strip steel surface. If a lens is used to collect light, a large lens arc surface is required, the volume of the light source will be large, and the production of the lens will be quite complicated.

Since LEDs are arranged at equal intervals, the illuminance of the middle part will be equal and the illuminance will drop sharply at the edge, and because the effective lighting width of the surface light source is limited under the condition of space constraints, the visual inspection of the uniform illumination of the strip hot rolling production line cannot be achieved. Require

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