JPS5775061A - Variable magnification method for harf tone picture - Google Patents
Variable magnification method for harf tone pictureInfo
- Publication number
- JPS5775061A JPS5775061A JP55150197A JP15019780A JPS5775061A JP S5775061 A JPS5775061 A JP S5775061A JP 55150197 A JP55150197 A JP 55150197A JP 15019780 A JP15019780 A JP 15019780A JP S5775061 A JPS5775061 A JP S5775061A
- Authority
- JP
- Japan
- Prior art keywords
- variable magnification
- picture elements
- density
- addresses
- picture
- Prior art date
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/40—Picture signal circuits
- H04N1/40068—Modification of image resolution, i.e. determining the values of picture elements at new relative positions
Abstract
PURPOSE:To reduce the occurrence of moire, by dispersing the density of each picture element after variable magnification to picture elements around this picture element in case of the variable magnification processing to give a regularity to the picture signal after the variable magnification processing as less as possible. CONSTITUTION:Respective picture elements of a coming scanning picture signal are stored in a buffer memory 2. Addresses of picture elements before variable magnification which overlap one another for addresses of picture elements after variable magnification are designated by an extracting counter 4, and their densities are given to a variable magnification density memory 5, and addresses of picture elements before variable magnification adjacent or near said addresses of picture elements before variable magnification are designated, and their densities are given to an adding circuit 6. The variable magnification density memory 5 gives a density output after variable magnification, which is calculated in accordance with the area ratio of addresses of picture elements before variable magnification, to a comparator 7, and this density output is compared with the threshold of a thershold level memory 8 to transmit a variable magnification output signal. Simultaneously, a differential output obtained from a differentiator 9 is accordance with the variable magnification output signal is inputted to the adding circuit 6 through weighting coefficient equipment 10, and thus, a new density is stored in the buffer memory 2.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55150197A JPS5775061A (en) | 1980-10-28 | 1980-10-28 | Variable magnification method for harf tone picture |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55150197A JPS5775061A (en) | 1980-10-28 | 1980-10-28 | Variable magnification method for harf tone picture |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5775061A true JPS5775061A (en) | 1982-05-11 |
Family
ID=15491632
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP55150197A Pending JPS5775061A (en) | 1980-10-28 | 1980-10-28 | Variable magnification method for harf tone picture |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5775061A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01134577A (en) * | 1987-11-20 | 1989-05-26 | Hitachi Ltd | Image processor |
JPH02239380A (en) * | 1989-03-14 | 1990-09-21 | Canon Inc | Picture element density converting device |
JPH0311879A (en) * | 1989-06-09 | 1991-01-21 | Canon Inc | Picture element density converter |
JPH03117170A (en) * | 1989-09-29 | 1991-05-17 | Oki Electric Ind Co Ltd | Picture element density conversion system |
JPH0468662A (en) * | 1990-07-04 | 1992-03-04 | Nec Corp | Line density converter for binary picture |
JPH05268462A (en) * | 1992-03-19 | 1993-10-15 | Mitsubishi Electric Corp | Picture processor |
-
1980
- 1980-10-28 JP JP55150197A patent/JPS5775061A/en active Pending
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01134577A (en) * | 1987-11-20 | 1989-05-26 | Hitachi Ltd | Image processor |
JPH02239380A (en) * | 1989-03-14 | 1990-09-21 | Canon Inc | Picture element density converting device |
JPH0311879A (en) * | 1989-06-09 | 1991-01-21 | Canon Inc | Picture element density converter |
JPH03117170A (en) * | 1989-09-29 | 1991-05-17 | Oki Electric Ind Co Ltd | Picture element density conversion system |
JPH0468662A (en) * | 1990-07-04 | 1992-03-04 | Nec Corp | Line density converter for binary picture |
JPH05268462A (en) * | 1992-03-19 | 1993-10-15 | Mitsubishi Electric Corp | Picture processor |
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