GB1310337A - Scanner for distinguishing between background and intelligence areas on a document - Google Patents
Scanner for distinguishing between background and intelligence areas on a documentInfo
- Publication number
- GB1310337A GB1310337A GB1314471A GB1314471A GB1310337A GB 1310337 A GB1310337 A GB 1310337A GB 1314471 A GB1314471 A GB 1314471A GB 1314471 A GB1314471 A GB 1314471A GB 1310337 A GB1310337 A GB 1310337A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transistor
- photo
- amplifier
- signal level
- signal
- 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.)
- Expired
Links
- 239000008186 active pharmaceutical agent Substances 0.000 abstract 2
- 230000035945 sensitivity Effects 0.000 abstract 2
- 230000003321 amplification Effects 0.000 abstract 1
- 239000003990 capacitor Substances 0.000 abstract 1
- 230000005669 field effect Effects 0.000 abstract 1
- 230000004048 modification Effects 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
- 238000003199 nucleic acid amplification method Methods 0.000 abstract 1
- 108091008695 photoreceptors Proteins 0.000 abstract 1
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 Image Signal Circuits (AREA)
- Facsimile Scanning Arrangements (AREA)
- Image Input (AREA)
- Facsimile Heads (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US3504870A | 1970-05-06 | 1970-05-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1310337A true GB1310337A (en) | 1973-03-21 |
Family
ID=21880306
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1314471A Expired GB1310337A (en) | 1970-05-06 | 1971-05-05 | Scanner for distinguishing between background and intelligence areas on a document |
Country Status (7)
| Country | Link |
|---|---|
| JP (1) | JPS5244171B1 (enExample) |
| BE (1) | BE766778A (enExample) |
| CA (1) | CA942679A (enExample) |
| DE (1) | DE2122481C2 (enExample) |
| FR (1) | FR2088395B1 (enExample) |
| GB (1) | GB1310337A (enExample) |
| NL (1) | NL7105991A (enExample) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56123176A (en) * | 1980-03-05 | 1981-09-28 | Ricoh Co Ltd | Processing method for picture signal |
-
1971
- 1971-01-06 CA CA102,072A patent/CA942679A/en not_active Expired
- 1971-02-19 JP JP46007486A patent/JPS5244171B1/ja active Pending
- 1971-05-03 NL NL7105991A patent/NL7105991A/xx unknown
- 1971-05-04 FR FR7116872A patent/FR2088395B1/fr not_active Expired
- 1971-05-05 GB GB1314471A patent/GB1310337A/en not_active Expired
- 1971-05-06 BE BE766778A patent/BE766778A/xx unknown
- 1971-05-06 DE DE19712122481 patent/DE2122481C2/de not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| NL7105991A (enExample) | 1971-11-09 |
| FR2088395A1 (enExample) | 1972-01-07 |
| JPS5244171B1 (enExample) | 1977-11-05 |
| DE2122481A1 (de) | 1971-11-25 |
| DE2122481C2 (de) | 1983-08-04 |
| FR2088395B1 (enExample) | 1976-12-03 |
| BE766778A (fr) | 1971-11-08 |
| CA942679A (en) | 1974-02-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4112384A (en) | Controlled recovery automatic gain control amplifier | |
| GB1329109A (en) | Discriminating circuit | |
| JPS6417504A (en) | High dynamics amplifier stage with strain detection function | |
| GB1266396A (enExample) | ||
| KR830003994A (ko) | 평균 잡음레벨을 탐지하는 노이즈 블래커(Noise blanker) | |
| US4216434A (en) | Variable gain alternating voltage amplifier | |
| US3904971A (en) | Automatic gain control amplifier circuit | |
| SU1103812A3 (ru) | Усилитель с регулируемым коэффициентом усилени | |
| US3560768A (en) | Control circuit for a low-frequency amplifier | |
| GB1017759A (en) | Improvements in or relating to variable gain transistor amplifiers | |
| KR850006275A (ko) | 이득 제어 증폭기 | |
| GB1310337A (en) | Scanner for distinguishing between background and intelligence areas on a document | |
| KR890003193A (ko) | 확성 전화기 | |
| GB1258176A (enExample) | ||
| US4077014A (en) | Automatic gain control circuit | |
| GB1437565A (en) | Wide dynamic range logarithmic amplifier arrangement | |
| GB1207242A (en) | Temperature compensated amplifier | |
| US4933647A (en) | AGC circuit | |
| KR840000139A (ko) | 텔레비젼 수신기의 자동이득제어 시스템용 잡음 감도 감소회로 | |
| GB1265034A (enExample) | ||
| SE336009B (enExample) | ||
| US3056928A (en) | Electronic circuit | |
| GB1215336A (en) | Absolute value function generator | |
| GB1470456A (en) | Automatic gain control circuits | |
| JPS57190468A (en) | Negative to positive inverting device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |