Bar code decoding system and method based on rolling shutter CMOS sensor

Abstract

The invention discloses a bar code decoding system based on a rolling shutter CMOS sensor. The bar code decoding system comprises a rolling shutter CMOS camera, an LED lighting lamp, a switch and a control part. The control part is electrically connected with the rolling shutter CMOS camera, and bar code images are collected by controlling parameter setting of the CMOS sensor. The control part controls the LED lighting lamp through the control switch to conduct light supplement on the rolling shutter CMOS camera. The invention further provides a bar code decoding method. By the utilization of the rolling shutter CMOS sensor, the LED lighting lamp is utilized to conduct light supplement on the rolling shutter CMOS camera, the quality of the images is judged by calculating the average grey degree and the contrast ratio of lighted regions on the images, and then parameters of the CMOS sensor are adjusted. According to the bar code decoding system based on the rolling shutter CMOS sensor, the optimum images can be acquired without changing an external lighting state, cost is remarkably lowered, and substitutability is good.

Description

technical field [0001] The invention relates to the technical field of barcode automatic identification, in particular to a barcode decoding system and method based on a rolling shutter CMOS sensor. Background technique [0002] At present, general-purpose image barcode scanning modules use global shutter CMOS sensors. Although such CMOS sensors have high optical performance, they are expensive. And at present, only a very small number of manufacturers in the world manufacture this kind of low-resolution CMOS of the global shutter, and the substitutability is very poor. To solve this problem, rolling shutter CMOS sensors commonly used in consumer electronics products can be used, which can significantly reduce costs, and many manufacturers are currently manufacturing various types of rolling shutter CMOS sensors, which are very replaceable. [0003] For any pixel of the rolling shutter CMOS sensor, it is cleared to zero at the beginning of the exposure, and then the signal ...

AI Technical Summary

Problems solved by technology

[0002] At present, general-purpose image barcode scanning modules use global shutter CMOS sensors. Although this CMOS sensor has high optical performance, it is very expensive.

And at present, only a few manufacturers in the world manufacture low-resolution CMOS with global shutter, and the substitutability is very poor.

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