EP0193528A1 - Ccd television camera - Google Patents
Ccd television cameraInfo
- Publication number
- EP0193528A1 EP0193528A1 EP19840903404 EP84903404A EP0193528A1 EP 0193528 A1 EP0193528 A1 EP 0193528A1 EP 19840903404 EP19840903404 EP 19840903404 EP 84903404 A EP84903404 A EP 84903404A EP 0193528 A1 EP0193528 A1 EP 0193528A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- outputs
- digital
- output
- comparator
- multiplexer
- 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.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 claims description 6
- 238000005070 sampling Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 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
-
- 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
- H04N1/40056—Circuits for driving or energising particular reading heads or original illumination means
Definitions
- This invention pertains to digital processing of video signals.
- a solid-state light sensor such as the charge-coup-device (“CCD”) type, typically provides two electrical outputs, which outputs must be combined to obtain the desired output signal.
- the two outputs are individually changed to digital form as soon* as available. This is so that circuit noise will be largely eliminated.
- a dynamic thresholding technique is used to derive a variable reference signal, which describes the transition from "black.” to "white” , and vice versa. This is implemented by means of a known digital filter.
- Fig. 1 is a block diagram of the circuit.
- Fig. 1 Optically represented subject matter in Fig. 1 is imaged upon a line of CCD photosites of sensor 2 by lens 3. Typically, electrical scanning is accomplished along that line and successive lines of subject matter are presented by movement of the subject matter at right angle ' s' to the line of CCD photosites.
- An alternate embodiment of sensor 2 has a two- dimensional mosaic of photosites. Two dimensional television scanning is accomplished electrically.
- digital control circuits 8 supply a square-wave of, say, 16 megahertz frequency in the two phases X and T; these being at 90° to each other.
- digitizer 4 is connected to the A output of CCD sensor 2, and digitizer 5 is separately connected to the B output of CCD sensor 2. There are 6 bit (for example) digital connections from each of these digitizers to multiplexer 10.
- comparator 7 An output therefrom becomes one input to comparator 7.
- the other input to comparator 7 is the output of multiplexer 10 passed through digital "FIR" non- recursive filter 12.
- the output from comparator 7 is a single-bit video output, suitable for video signal processing in the usual manner.
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Transforming Light Signals Into Electric Signals (AREA)
Abstract
Une sortie vidéo à un seul bit est obtenue à partir de deux sorties analogiques d'un senseur à dispositif à couplage de charge par la numérisation de chaque sortie vidéo, par le multiplexage des deux sorties numériques résultantes, et par la transmission du résultat à un comparateur; une de ces sorties passe à travers un filtre numérique.A single bit video output is obtained from two analog outputs of a charge coupled device sensor by digitizing each video output, by multiplexing the two resulting digital outputs, and by transmitting the result to a comparator; one of these outputs passes through a digital filter.
Description
CCD TELEVISION CAMERA
TECHNICAL FIELD
This invention pertains to digital processing of video signals.
BACKGROUND ART The video processor per se is a known device. U.S. patent No. 4,399,470, entitled "Optical Scanning System", to Earl R. Hibbard, discloses one type of this device. This processor, as usual, is applied to the video signal after it has been generated by an image sensor device.
SUMMARY OF THE INVENTION
A solid-state light sensor, such as the charge- coupled-device ("CCD") type, typically provides two electrical outputs, which outputs must be combined to obtain the desired output signal..
When, according to the prior art, these outputs are retained and processed in analog form, the combined output is not easily obtained. Also the many processing steps each introduce noise and signal degredation problems.
However,• according to this invention, the two outputs are individually changed to digital form as soon* as available. This is so that circuit noise will be largely eliminated. t In addition, a dynamic thresholding technique is used to derive a variable reference signal, which describes the transition from "black." to "white" , and vice versa. This is implemented by means of a known digital filter.
BRIEF DESCRIPTION OF DRAWINGS
Fig. 1 is a block diagram of the circuit.
BEST MODE FOR CARRYING OUT THE INVENTION
Optically represented subject matter in Fig. 1 is imaged upon a line of CCD photosites of sensor 2 by lens 3. Typically, electrical scanning is accomplished along that line and successive lines of subject matter are presented by movement of the subject matter at right angle's' to the line of CCD photosites.
An alternate embodiment of sensor 2 has a two- dimensional mosaic of photosites. Two dimensional television scanning is accomplished electrically.
In Fig. 1, digital control circuits 8 supply a square-wave of, say, 16 megahertz frequency in the two phases X and T; these being at 90° to each other.
Inventively, digitizer 4 is connected to the A output of CCD sensor 2, and digitizer 5 is separately connected to the B output of CCD sensor 2. There are 6 bit (for example) digital connections from each of these digitizers to multiplexer 10.
An output therefrom becomes one input to comparator 7. The other input to comparator 7 is the output of multiplexer 10 passed through digital "FIR" non- recursive filter 12. The output from comparator 7 is a single-bit video output, suitable for video signal processing in the usual manner.
Claims
1. The method of processing video signals from a CCD device that has one or more outputs, which includes the method steps of;
(a) separately performing digitization on each of said outputs, and
(b) subsequently digitally combining these outputs into one single-bit video signal for image processing.
2. The method of claim 1, in which the combining step includes the method steps of;
(a) sampling the separate digital outputs at adjacent intervals of time, and
(b) combining the sampled digital outputs in a single signal channel.
3. The method of calim 1, in which;
(a) the plurality of outputs is two.
4. Apparatus for forming a single-bit video output from a CCD sensor (2) that has two digital control circuit inputs (jz.X and jz.T) and twp analog signal outputs (A & B) , said apparatus comprising; (a) a first digitizer (4) connected to a first said analog signal output (A) ,
(b) a second digitizer (5) connected to a second said analog signal output (B) ,
(c) a multiplexer (10) , having inputs connected by digital means to each of said first and second digitizers, and having a digital output,
(d) a comparator (7) having a first input directly digitally connected to the digital output of said multiplexer (10) , and (e) a digital filter (12) , digitally connected to the output of said multiplexer and digitally connected to a second input of said comparator, to provide a single-bit video output from said comparator (7) .
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/US1984/001416 WO1986001668A1 (en) | 1984-09-05 | 1984-09-05 | Ccd television camera |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0193528A1 true EP0193528A1 (en) | 1986-09-10 |
Family
ID=22182250
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19840903404 Withdrawn EP0193528A1 (en) | 1984-09-05 | 1984-09-05 | Ccd television camera |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0193528A1 (en) |
| WO (1) | WO1986001668A1 (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3814846A (en) * | 1972-01-20 | 1974-06-04 | Reticon Corp | High density photodetection array |
| US4091379A (en) * | 1976-05-03 | 1978-05-23 | Litton Business Systems, Inc. | Analog to digital wave shaping system |
| JPS561660A (en) * | 1979-06-20 | 1981-01-09 | Ricoh Co Ltd | Reading method |
| US4345314A (en) * | 1980-11-19 | 1982-08-17 | International Business Machines Corporation | Dynamic threshold device |
-
1984
- 1984-09-05 WO PCT/US1984/001416 patent/WO1986001668A1/en unknown
- 1984-09-05 EP EP19840903404 patent/EP0193528A1/en not_active Withdrawn
Non-Patent Citations (1)
| Title |
|---|
| See references of WO8601668A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO1986001668A1 (en) | 1986-03-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE FR GB |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
| 18D | Application deemed to be withdrawn |
Effective date: 19860806 |
|
| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: VAN DEN HEUVEL, RAYMOND, CHARLES |