Method and device for searching bar code boundary by envelope line based on first-order difference

Abstract

The invention discloses a method for searching a bar code boundary by an envelope line based on first-order difference. The method comprises the following steps: calculating acquired original bar codedata according to a first-order difference formula to obtain an edge intensity gradient image; drawing an upper envelope line and a lower envelope line of the edge intensity gradient image accordingto an envelope line function formula; identifying the maximum value of each section of rising region in the upper envelope line, and storing the x-axis position record of the maximum value in the first array to obtain a first boundary; identifying the minimum value of each section of descending area in the lower envelope line, and storing the x-axis position record of the minimum value in a secondarray to obtain a second boundary. The first-order difference mode is carried out on original data and then the envelope line is utilized to search the boundary so that the technical problem that part of boundary information is lost due to the fact that the upper envelope line and the lower envelope line of original data are used for searching the boundary in barcode boundary searching in the prior art is solved, the image boundary is determined through the extreme value and barcode boundary searching accuracy is improved.

Description

technical field [0001] The invention relates to the technical field of barcode boundary search, in particular to a method and device for searching a barcode boundary based on an envelope of a first-order difference. Background technique [0002] Barcodes are now collectively referred to as barcodes in the world. The formation of barcodes is composed of multiple black lines of varying thickness and blank spaces, and is uniformly arranged according to the coding rules. The common barcodes are arranged in black and white. The parallel line pattern, the content of the barcode output covers the production country, manufacturer, product name, production date, book classification number, category, mail start and end location, date and many other information. , food safety and library management have been widely used. [0003] Currently widely used barcodes include one-dimensional barcodes and two-dimensional barcodes. A one-dimensional barcode, also known as a linear barcode, is ...

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Problems solved by technology

[0007] The present invention provides a method for searching the barcode boundary based on the envelope line of the first-order difference, and then uses the envelope line to search the boundary by performing the first-order difference on the original data, so as to solve the problem of using the original data in the barcode boundary search in the prior art The upper and lower envelope search boundaries caused the technical problem of partial boundary information loss, so the boundary of the image was determined by the extreme values ​​of the upper and lower envelopes, thereby improving the accuracy of barcode boundary search

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