Method for determining directions of boundaries of bar code layers based on Hough transformation
A method of determination and a technology for dividing lines, applied in the field of determining the direction of barcode layer dividing lines, can solve problems such as low information capacity and space utilization, unrecognizable errors, etc.
Inactive Publication Date: 2010-11-10
NEWLAND DIGITAL TECH CO LTD
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Problems solved by technology
One-dimensional barcodes only express information in one direction (generally the horizontal direction), but do not express any information in the vertical direction, so the information capacity and space utilization rate are low, and the barcode cannot be recognized after it is damaged
[0004]The two-dimensional barcode is composed of black and white specific geometric figures distributed in the two-dimensional direction according to certain rules, which can express information in the two-dimensional direction, so the information The capacity and space utilization are low, and it has a certain verification function
However, in the prior art, the direction of the barcode layer boundary is generally only determined by one barcode layer boundary, and there is a certain error
Method used
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[0019] The invention provides a method for determining the direction of the barcode layer boundary line based on Hough transformation. The method improves the accuracy of determining the direction of the barcode layer boundary line by performing Hough transformation on the boundary points on the boundary lines of multiple barcode layers.
[0020] Such as figure 1 As shown, in the method for determining the direction of the barcode layer boundary line of the present invention, firstly, the scanning area and the coordinate origin are determined on the barcode image.
[0021] Specifically, as figure 2 As shown, multiple scan lines are used to search for barcode boundaries in the barcode image. For example, take the PDF417 barcode as an example, scan the barcode image along each scanning line, after scanning to a black and white boundary point, continue to scan 8 black and white boundary points based on the black and white boundary point, and determine each black and white bound...
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The invention discloses a method for determining the directions of the boundaries of bar code layers based on Hough transformation. The method comprises the following steps of: determining matrix elements with maximum accumulated value in a plurality of matrix elements corresponding to the discrete value of each distance from the matrices of a two-dimensional accumulator, selecting the matrix elements with a preset number and maximum accumulated value as primary matrix elements and carrying out weighted sum on the primary matrix elements to determine the parameters of the directions of the boundaries of the bar code layers. By the method, the directions of the boundaries of the bar code layers are determined by carrying out Hough transformation on demarcation points on the boundaries of a plurality of bar code layers, and the accuracy of the determination of the directions of the boundaries of the bar code layers can be enhanced.
Description
【Technical field】 [0001] The invention relates to a method for determining the direction of a barcode layer boundary line, in particular to a method for determining the direction of a barcode layer boundary line based on Hough transform. 【Background technique】 [0002] Barcode technology is an emerging technology that integrates coding, printing, identification, data collection and processing developed on the basis of computer technology and information technology. Barcode technology is widely used in business, library management, warehousing, post and telecommunications, transportation and industrial control due to its advantages of fast, accurate, reliable and low cost, and is bound to play an important role in the emerging "Internet of Things" applications. role. [0003] Currently widely used barcodes include one-dimensional barcodes and two-dimensional barcodes. A one-dimensional barcode, also known as a linear barcode, is composed of multiple "bar" and "space" units ...
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IPC IPC(8): G06K7/10
Inventor 陈文传王贤福蔡强陈海涵
Owner NEWLAND DIGITAL TECH CO LTD