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US3728481A
Expired / Lapsed
US
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Method for improving the accuracy of evaluating certain objects in the field of a raster scan
Assignee: Siemens AG
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Filing: 1971-03-10
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Granted: 1973-04-17
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Expires: 1991-03-10
Abstract
Abstract The invention contemplates a method and means for evaluating an area or other function of an object scanned within the field of view of a raster-scan device such as a TV camera. A control video signal is first formed for a complete raster and is stored. It is then used as a basic reference for creating the video signal developed upon subsequent scanning of an object or objects in the same field of view as that comprehended by the original control video signal. In the form specifically disclosed, the stored video signal is used to control the amplification of newly produced video signal, in synchronism with the raster development thereof. The invention is described in the context of area evaluation of scanned objects, wherein amplitude-discrimination techniques are relied upon to make an additional evaluation of object brightness.
Inventors
- 👤 W Froehlich
- 👤 W Lang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:33
CPC Classifications
G; G01; G01N; G01N15/00; G01N15/10; G01N15/14; G01N15/1429; G01N15/1433
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
182 words
Apparatus for evaluating certain objects within a field of raster-scanned subject matter, wherein an electrical video signal is produced for successive line scans of the field, comprising storage means synchronized with raster scanning and having the capacity of storing a raster of the video signal, video-amplifier means connected to amplify the video signal, and an amplitudecontrolling connection to said video-amplifier means from the output of said storage means, whereby a first raster of video signal is stored as a control video signal, and then the stored video signal is used as a synchronous corrective control of the video amplifier during a subsequent scan of the field, signalprocessing means including an amplitude discriminator connected to the output of said amplified, and blanking signal generating means having an input connected for resPonse to the output of said discriminator, said blanking-signal generating means having a control connection to said video amplifier, whereby an object first selected by said discriminator for evaluation is the basis of its own elimination from the raster of video signal for subsequent raster scan to encompass another object in the field.
Claim 2
Dependent Claim
182 words
Apparatus for evaluating certain objects within a field of raster-scanned subject matter, wherein an electrical video signal is produced for successive line scans of the field, comprising storage means synchronized with raster scanning and having the capacity of storing a raster of the video signal, video-amplifier means connected to amplify the video signal, and an amplitudecontrolling connection to said video-amplifier means from the output of said storage means, whereby a first raster of video signal is stored as a control video signal, and then the stored video signal is used as a synchronous corrective control of the video amplifier during a subsequent scan of the field, signalprocessing means including an amplitude discriminator connected to the output of said amplified, and blanking signal generating means having an input connected for resPonse to the output of said discriminator, said blanking-signal generating means having a control connection to said video amplifier, whereby an object first selected by said discriminator for evaluation is the basis of its own elimination from the raster of video signal for subsequent raster scan to encompass another object in the field.
Claim 3
Dependent Claim
26 words
Apparatus according to claim 1, in which storage means synchronous with raster-scanning is included in the amplitude-controlling connection of said discriminator output to said video amplifier.
Claim 4
Independent Claim
128 words
The method of evaluating certain objects within a field of raster-scanned subject matter, wherein an electrical video signal is produced for successive line scans of the field, which comprises utilizing a first level of amplitude discrimination to select a first particular scanned object for evaluation to the exclusion of another scanned object, raster-scanning the thus-selected field to generate and store a video signal unique to the first evaluated object, utilizing a second level of amplitude discrimination to select a second particular scanned object for evaluation, and utilizing the stored first signal in synchronism with raster scanning of the field at the second discrimination level to blank out video signals attributable to the first evaluated object while scanning to develop a video signal unique to the second evaluated object.
Claim 5
Independent Claim
128 words
The method of evaluating certain objects within a field of raster-scanned subject matter, wherein an electrical video signal is produced for successive line scans of the field, which comprises utilizing a first level of amplitude discrimination to select a first particular scanned object for evaluation to the exclusion of another scanned object, raster-scanning the thus-selected field to generate and store a video signal unique to the first evaluated object, utilizing a second level of amplitude discrimination to select a second particular scanned object for evaluation, and utilizing the stored first signal in synchronism with raster scanning of the field at the second discrimination level to blank out video signals attributable to the first evaluated object while scanning to develop a video signal unique to the second evaluated object.
Claim 6
Independent Claim
88 words
The method of evaluating certain objects within a field of raster-scanned subject matter, wherein an electrical video signal is produced for successive line scans of the field, which comprises utilizing amplitude discrimination to select a particular scanned object for evaluation to the exclusion of another scanned object, scanning the thus-selected field to generate and store control video signal unique to the evaluated object, and utilizing the stored signal in synchronism with a subsequent raster scan of said field to blank out video signals attributable to the evaluated object.
Claim 7
Independent Claim
88 words
The method of evaluating certain objects within a field of raster-scanned subject matter, wherein an electrical video signal is produced for successive line scans of the field, which comprises utilizing amplitude discrimination to select a particular scanned object for evaluation to the exclusion of another scanned object, scanning the thus-selected field to generate and store control video signal unique to the evaluated object, and utilizing the stored signal in synchronism with a subsequent raster scan of said field to blank out video signals attributable to the evaluated object.
Claim 8
Dependent Claim
32 words
The method of claim 4, in which the video signal processed for storage is subjected to low-pass filtering before utilizing the same to modify the video-signal development produced by scanning the field.
Claim 9
Dependent Claim
42 words
The method of claim 4, in which video signal unique to the evaluated object is stored prior to said blank-out use, so that video signal unique to the evaluated object is always blanked from video produced on subsequent scans of the field.
Claim 10
Dependent Claim
77 words
The method of claim 6, in which amplitude-discrimination is employed to select another particular scanned object for evaluation to the exclusion of a still further scanned object, and in which video signal unique to said other scanned object is added to storage of the video signal unique to the first-evaluated object, whereby blanking excludes video signal development for the first and second evaluated objects when scanning the field for evaluation of the said still further scanned object.
Claim 11
Independent Claim
107 words
The method of evaluating an object within a field of raster-scanned subject matter, wherein an electrical video signal is produced for successive line scans of the field, which comprises generating and storing a control video signal by successively scanning said field for n-rasters, regulating the video input to storage for each raster scan to a maximum level which is substantially 1/nth of the maximum amplitude capacity for storage, whereby random interfering voltage transient effects are minimized in the storage of n raster scans, and utilizing the stored signal in synchronism with subsequent scan of said field to modify the amplitude of the video-signal generated during said scan.
Claim 12
Independent Claim
107 words
The method of evaluating an object within a field of raster-scanned subject matter, wherein an electrical video signal is produced for successive line scans of the field, which comprises generating and storing a control video signal by successively scanning said field for n-rasters, regulating the video input to storage for each raster scan to a maximum level which is substantially 1/nth of the maximum amplitude capacity for storage, whereby random interfering voltage transient effects are minimized in the storage of n raster scans, and utilizing the stored signal in synchronism with subsequent scan of said field to modify the amplitude of the video-signal generated during said scan.
Claim 13
Dependent Claim
28 words
The method of claim 8 wherein the n-rasters of scan are relied upon to produce the stored signal while scanning the field in the absence of the object.
Claim 14
Dependent Claim
27 words
The method of claim 8 wherein the n-rasters of scan are relied upon to produce a stored signal while scanning the field when it contains the object.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |