A method and device for quickly identifying image-type ccd barcodes

Abstract

The invention provides a rapid identification method and apparatus for an image type CCD bar code, wherein the method and apparatus are applied to a bar code identification system. The bar code identification system consists of a linear CCD image sensor and a collection device employing a DMA+ADC collection device. The method comprises: the linear CCD image sensor is started to scan a bar code; the DMA+ADC collection device is started to carry out collection and stores a collected signal into a buffer region; a filter threshold value of the collected signal is modified to carry out filtering; decoding is carried out and whether the decoding is done successfully is determined; if so, a parameter is processed and a bar code obtained by reading is outputted; and if not, a next step is executed; whether the filter threshold value exceeds a preset range is determined; if so, a return operation is executed; and if not, a return operation is executed. The method and apparatus has the following beneficial effects: a bar code on a backlight source can be read; long-distance discrete reading can be realized; the bar code identification speed and the bar code data outputting speed are increased; and the identification and reading precision is high.

Description

technical field [0001] The invention relates to the field of barcode identification, in particular to an image type CCD barcode rapid identification method and device. Background technique [0002] According to the application scope of the barcode, the reader is required to be able to read both the barcode on the non-backlight source (such as paper label, plastic) and the barcode on the backlight source (such as PC display screen / mobile phone screen). Long-distance separate reading; while traditional laser readers cannot read barcodes with backlights (such as PC display screens / mobile phone screens), existing CCD readers on the market cannot read long-distance separate reads. Single use of ADC or external IO port interrupt method to collect data will affect the collection speed, occupy a large amount of microprocessor flash space, reduce the speed of barcode recognition and output barcode data, in addition, the filter processing lacks a conversion threshold, and multiple dec...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to address the defects of the prior art that the above-mentioned barcodes on the backlight cannot be read, cannot be read remotely and separatedly, reduce the speed of identifying barcodes and outputting barcode data, and the reading accuracy is not high. The invention provides a method and device for fast recognition of image-type CCD barcodes, which can read barcodes on backlights, can be read separately from a long distance, improve the speed of recognizing barcodes and outputting barcode data, and have high reading accuracy.

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