| 摘要 |
PURPOSE:To improve the reliability by inverting binary picture information of a character area if necessary and preventing the identification processing from being complicated independently of relations between the background level and the character level of input picture information. CONSTITUTION:A television camera 2 reads a character string 1a on a product 1, and picture information is stored in a multilevel picture memory 4, and the character string 1a is detected by a space differentiating circuit 5, a projection circuit 6, and an area detecting circuit 7. A histogram generating circuit 8 generates a histogram of picture element number to density value in accordance with picture information of a detected character area P4, and a threshold deciding circuit 9 detects a bottom part of the histogram, which is the boundary between the background part and the character part, and defines it as a threshold. A comparing circuit 12 outputs '0' when the number of picture elements in the low level is larger than that in the high level, and an exclusive OR circuit 14 inverts the output of a binarizing circuit 13 then. A picture where relations between the reflection factor of the background of the input picture and that of characters are determined inequivocally is inputted to a recognizing circuit 15, and the recognition processing is not complicated.
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