JPS561661A - Reading method - Google Patents
Reading methodInfo
- Publication number
- JPS561661A JPS561661A JP7774479A JP7774479A JPS561661A JP S561661 A JPS561661 A JP S561661A JP 7774479 A JP7774479 A JP 7774479A JP 7774479 A JP7774479 A JP 7774479A JP S561661 A JPS561661 A JP S561661A
- Authority
- JP
- Japan
- Prior art keywords
- value
- memory
- levels
- threshold level
- block
- 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
- H04N1/403—Discrimination between the two tones in the picture signal of a two-tone original
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Facsimile Heads (AREA)
- Facsimile Image Signal Circuits (AREA)
Abstract
PURPOSE:To ensure the decision for the proper threshold level even to the picture having a low contrast by deciding the threshold level statistically and based on the picture information. CONSTITUTION:The picture signal sent by one line from the image pickup element is converted into the quantitized value by A/D converter 6 to be supplied to decoder 7. And the output is supplied to counter 4 from the output line corresponding to the quantized value. Accordingly, either one of counters 40-431 is counted up by the level of the picture signal. This action is carried out to one block on the original, and the density frequency of that block is preserved. Control circuit 5 takes the value of counter 4 into adder circuit 8 when the internal secondary scanning width counter reaches the fixed value. And when the value is carried up for addition in sequence to become larger than the comparing value, this value is reserved at memory 10 in the form of the threshold level of the corresponding block. Circuit 5 reads in sequence the threshold levels out of memory 10 at the going and coming back scanning time, and then the levels are compared with the contents of memory 10 to be classified into two levels.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7774479A JPS561661A (en) | 1979-06-20 | 1979-06-20 | Reading method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7774479A JPS561661A (en) | 1979-06-20 | 1979-06-20 | Reading method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS561661A true JPS561661A (en) | 1981-01-09 |
Family
ID=13642410
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7774479A Pending JPS561661A (en) | 1979-06-20 | 1979-06-20 | Reading method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS561661A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57197800U (en) * | 1981-06-09 | 1982-12-15 | ||
| JPS6354680A (en) * | 1986-08-26 | 1988-03-09 | Canon Inc | Position detector |
| JPS63178956A (en) * | 1986-12-29 | 1988-07-23 | ベクトン・ディッキンソン・アンド・カンパニー | Computer preparing stopper and preparation thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51123512A (en) * | 1975-04-22 | 1976-10-28 | Rikagaku Kenkyusho | Binary picture reading method |
-
1979
- 1979-06-20 JP JP7774479A patent/JPS561661A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51123512A (en) * | 1975-04-22 | 1976-10-28 | Rikagaku Kenkyusho | Binary picture reading method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57197800U (en) * | 1981-06-09 | 1982-12-15 | ||
| JPS6354680A (en) * | 1986-08-26 | 1988-03-09 | Canon Inc | Position detector |
| JPS63178956A (en) * | 1986-12-29 | 1988-07-23 | ベクトン・ディッキンソン・アンド・カンパニー | Computer preparing stopper and preparation thereof |
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