Fig. 1. Example of characters superimposed on delivery slip.

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Extraction of Handwritten Character String Superimposed on Delivery Slip Data Ken-ichi MATSUO, Non-member, Katsuhiko UEDA, Non-member (Nara National College of Technology), Michio UMEDA, Member (Osaka Electro-Communication Univ) In this paper, an extraction method of the handwritten character string superimposed on the delivery slip is proposed. First of all, the HSL transform is given to the delivery slip image input from the TV camera. The chroma color aspect distribution chart is made by using the saturation and the hue obtained by the HSL transform. The cluster is extracted from this chroma distribution chart and a binary code character area is extracted by using the adjustment threshold method. In this case, void elements exist in the obtained binary image, so the element is restored from a binary image by lightness information. The code character is extracted by using structural elements in the morphological filter, whose diameter is equal to the width of the average line estimated from a binary image. All characters were extracted from 200 characters of 50 images as a result of the extraction experiment.

Fig. 1. Example of characters superimposed on delivery slip.

Fig. 2. H-S distribution map.

Fig. 3. Region extraction using threshold. Fig. 4. Overlap of background character stroke and code number stroke.

Fig. 5. Square structure elements of size i. Fig. 6. Generation example of disk structure element r2bd.

Fig. 7. Several size of disk structure elements. Fig. 8. Result of dilation operation. Fig. 9. Binary images extracted by dynamic thresholding methods.

Table 1. Result of accuracy evaluation. Table 4. Separation accuracy to image size. Table 2. Result of separation accuracy for blurred images. Table 3. Code character extraction result.

Table 5. Character extraction result. Table 6. Rejection result. Fig. 10. Extraction result using this method. Fig. 11. Example which is difficult in extraction.

Leedham G. & Thomassen A.eds., pp.419-427 (1996) (9) A. R. Smith: Color Gamut Transformation Paris, Computers Graphics, Vol.12, pp.12-19 (1978) (6) K. Ueda: Extraction of Signature and Seal Imprint from Bankchecks by Using Color Information, Proc.Of the Third ICDAR, pp.665-668 (1995) (7) K. Ueda: Extraciton of Signature and Seal Imprint from Documents, Handwriting and Drawing Reserch, Simner M.,