JPS6476288A - Picture processor - Google Patents

Abstract

PURPOSE:To obtain a stable character segment ratio without the influence of a back ground noise by detecting the maximum and the minimum values of a multivalued histogram, deciding a binarization level for every part between the maximum and the minimum values based on the result and binarizing the multivalued histogram. CONSTITUTION:A multivalued picture from a TV camera 2 is binarized in a picture data binary converting part 4 and stored in a binary picture memory 1. The multivalued histogram of an area designated by a histogram forming address memory 6 is formed and stored in a multivalued histogram memory 7. A maximum and minimum detecting part 8 examines the maximum and the minimum values to replace by an upper limit value when the maximum value from an upper limit and lower limit value table 10 is larger than the upper limit value and replace by the lower limit value when the minimum value is smaller than the lower limit value and obtain the binary level between the maximum and the minimum values in a binary level detecting part 9 by the use of these values. The part between the respective maximum values and the minimum values is binarized in a histogram binarization converting part 11 by the use of this binary level and stored in a binary histogram memory 12. After the completion of forming the histogram, a character position is detected in a character segment part 13 based on the binary histogram.