Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NTT Inc
Original Assignee
Nippon Telegraph and Telephone Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Telegraph and Telephone CorpfiledCriticalNippon Telegraph and Telephone Corp
Priority to JP57022433ApriorityCriticalpatent/JPS58139554A/ja
Publication of JPS58139554ApublicationCriticalpatent/JPS58139554A/ja
Publication of JPS6240903B2publicationCriticalpatent/JPS6240903B2/ja
Image reproduction involving enlargement or reduction of extracted contour vector data for binary regions in images having both binary and halftone regions
Image processing apparatus providing a bilevel image signal by changing binarization threshold value based on densities of original image areas incuding target pixel and less than all surrounding pixels