| 摘要 |
PURPOSE:To eliminate binary-coding errors due to the effect of surrounding picture elements by detecting 4 picture elements at the upper/lower/left/right position of a noted picture element in binary-coding and reading picture information and correcting the resulting noted picture element level while referring to a correction table. CONSTITUTION:After an analog image from a CCD 11 is digitized, the result is subjected to sample holding by an n-bit latch 13 and a preceding line and a noted binary-coded line are stored in a RAM 14. As soon as a succeeding line is read, after a picture element R2 is extracted from the RAM 14, the preceding line is given in a RAM 15, one bit is shifted by a delay circuit (DEL) 16 to extract a picture element R1. A signal of the binary-coded line is shifted by 1 bit in a DEL 17 to extract a noted picture element D and a picture element R3 is extracted via a DEL 18. A signal of the preceding line is given to a DEL 19, one bit is shifted and a picture element R4 is extracted from the RAM 14. Then the noted picture 1 is divided into a table ROM 21 receiving a longitudinal component (R1, D, R3) and a table 22 receiving a lateral component (R2, D, R3), they are corrected separately, the result is put in a decode ROM 23, a slice level is given to apply binary-coding finally.
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