IEEE Trans Image Process - Binarization of low-quality barcode images captured by mobile phones using local window of adaptive location and size.

Tópicos

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Resumo

It is difficult to directly apply existing binarization approaches to the barcode images captured by mobile device due to their low quality. This paper proposes a novel scheme for the binarization of such images. The barcode and background regions are differentiated by the number of edge pixels in a search window. Unlike existing approaches that center the pixel to be binarized with a window of fixed size, we propose to shift the window center to the nearest edge pixel so that the balance of the number of object and background pixels can be achieved. The window size is adaptive either to the minimum distance to edges or minimum element width in the barcode. The threshold is calculated using the statistics in the window. Our proposed method has demonstrated its capability in handling the nonuniform illumination problem and the size variation of objects. Experimental results conducted on 350 images captured by five mobile phones achieve about 100% of recognition rate in good lighting conditions, and about 95% and 83% in bad lighting conditions. Comparisons made with nine existing binarization methods demonstrate the advancement of our proposed scheme.

Resumo Limpo

difficult direct appli exist binar approach barcod imag captur mobil devic due low qualiti paper propos novel scheme binar imag barcod background region differenti number edg pixel search window unlik exist approach center pixel binar window fix size propos shift window center nearest edg pixel balanc number object background pixel can achiev window size adapt either minimum distanc edg minimum element width barcod threshold calcul use statist window propos method demonstr capabl handl nonuniform illumin problem size variat object experiment result conduct imag captur five mobil phone achiev recognit rate good light condit bad light condit comparison made nine exist binar method demonstr advanc propos scheme

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