EP0066427A1
Expired / Lapsed
EP
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Scan conversion circuit
Assignee: BAE Systems Electronics Ltd
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Filing: 1982-05-21
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Granted: —
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Expires: 2002-05-21
Abstract
Abstract A scan conversion circuit for a thermal imager device in which a field is scanned by a parallel-series array of infra-red detectors swept broadside over the field to produce a band of parallel I.R. signals. The signals from the array of detectors are sampled at high speed in a pattern which traces each parallel line of detectors in turn. A C.R.T. is scanned in a similar pattern, the pattern being repeated at high speed with successive lateral displacements corresponding to the rate at which the I.R. array sweeps the field.
Inventors
- 👤 David Arthur Beaumont
- 👤 Michael Anthony King
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 20:29
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/02; H04N3/08; H04N3/09; H04N23/00; H04N23/20; H04N23/23
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
136 words
A scan conversion circuit adapted to accept signals from an array of detector elements arranged to scan a field of view in a serial-parallel mode, the scan conversion circuit providing scanning signals for a cathode ray tube (C.R.T.) display, characterised in that the scan conversion circuit (Figure 4) comprises a deflection circuit (27, 31, 33) adapted to provide a C.R.T. scan raster (Figure 3) which is a high speed trace of the pattern (Figure 1) of the array repeated a multiplicity of times with intervening small displacements in a direction and at a rate corresponding to the serial scan of said array, the scan conversion circuit also comprising means (23, 25, 29) for supplying a C.R.T. brightness signal corresponding to the signal arising from the detector element to which said trace corresponds at any particular time.
Claim 2
Dependent Claim
136 words
A scan conversion circuit adapted to accept signals from an array of detector elements arranged to scan a field of view in a serial-parallel mode, the scan conversion circuit providing scanning signals for a cathode ray tube (C.R.T.) display, characterised in that the scan conversion circuit (Figure 4) comprises a deflection circuit (27, 31, 33) adapted to provide a C.R.T. scan raster (Figure 3) which is a high speed trace of the pattern (Figure 1) of the array repeated a multiplicity of times with intervening small displacements in a direction and at a rate corresponding to the serial scan of said array, the scan conversion circuit also comprising means (23, 25, 29) for supplying a C.R.T. brightness signal corresponding to the signal arising from the detector element to which said trace corresponds at any particular time.
Claim 3
Dependent Claim
47 words
A scan conversion circuit according to Claim 1, wherein said deflection circuit is adapted to provide a scan raster which traces successive parallel sections of said array in sequence, each of said small displacements corresponding to a small fraction of the displacement between said successive parallel sections.
Claim 4
Dependent Claim
43 words
A scan conversion circuit according to Claim 2, wherein successive parallel sections of the scan raster are displaced in the parallel direction to accommodate an array of detector elements (Figure 1) in which successive parallel sections are similarly displaced to provide line interlacing.
Claim 5
Dependent Claim
35 words
A scan conversion circuit according to any preceding claim, wherein said deflection circuit is adapted ' to produce digital deflection signals such that the C.R.T. scan pauses at each point corresponding to a detector element.
Claim 6
Dependent Claim
73 words
A scan conversion circuit according to any preceding claim, wherein said multiplicity of raster traces constitutes a swathe (Figure 2) forming part of the C.R.T. field, said deflection circuit being adapted to repeat the swathe a number of times (Figure 3), so that the swathes lie adjacent to each other in the parallel direction to form a uniform complete C.R.T. field in correspondence with the field scanned by said array of detector elements.
Claim 7
Dependent Claim
52 words
A scan conversion circuit according to Claim 4, wherein said deflection circuit is adapted to produce digital deflection signals to trace an array comprising two columns of detector elements each column extending in the parallel direction, the two columns being staggered to provide interlaced scan lines on scanning in the serial direction.
Claim 8
Dependent Claim
53 words
Image conversion means comprising an array of optical detector elements, means for scanning an object field with said array in a parallel-serial node, a scan conversion circuit according to any preceding claim adapted to accept signals from said array of detector elements and to provide C.R.T. deflection signals and brightness modulation signals accordingly.
Claim 9
Dependent Claim
31 words
Image conversion means according to Claim 7, and further including an electrostatic cathode ray tube connected to said scan conversion circuit to employ said C.R.T. deflection signals and brightness modulation signal.
Claim 10
Dependent Claim
19 words
Image conversion means according to Claim 7 or Claim 8 wherein said detector elements are sensitive to infra-red radiation.
References Cited (Backward Citations)
FR1394825A
Cited
US4158137A
Cited
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