HIGH CAPACITY 2D COLOR BARCODE DESIGN AND PROCESSING METHOD FOR CAMERA BASED APPLICATIONS
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United States of America Patent
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Issued Date -
Dec 29, 2016
app pub date -
Jun 23, 2015
filing date -
Jun 23, 2015
priority date (Note) -
Abandoned
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Abstract
A processing method for a color barcode image captured by a camera or barcode reader. The barcode includes color data cells and multiple large black locators which are located at the four corners of the barcode, along the four borders, and inside the barcode forming an array. The locators are first identified. Perspective correction is performed by dividing the barcode image into smaller regions each containing four locators, individually transforming each region into its original shape e.g. square, and spatially combining them into the barcode image. Illumination correction is applied to the barcode image based on average pixel intensities of the locators, by calculating an illumination correction map using the average densities of the locators and 2-dimensional interpolation for pixel positions other than the locators.
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