EP0129446A2
Expired / Lapsed
EP
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Automatic color analysis based on minimum/maximum video level
Assignee: BAE Systems Aerospace Inc
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Filing: 1984-06-20
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Granted: —
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Expires: 2004-06-20
Abstract
Abstract A color film analyser (100) having a plurality of adjustable control elements (121). The elements act on color representative video signals (106,113, Vo) which are derived from a film (50) being analyzed. The elements vary a video characteristic of the video signals and thereby vary the display (108) of the video signal generated by the analyzer. Peak detectors (200) detect the video level of the color representative video signals. The detected peaks are converted into digital information (300, 301) and compared (400) to a reference. The reference is derived from underexposed, overexposed and properly exposed reference films. The control elements are automatically adjusted (403) in response to the results of the comparison.
Inventors
- 👤 Arthur J. Eisenhuth
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 20:38
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/46; H04N1/56; H04N1/60; H04N1/6027; H04N1/6011
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
88 words
Claim 1. An apparatus for automatically analyzing the color content of a first film as compared to at least one reference film characterized by: a first circuit for determining the peak level of the color content derived from the first film; a second circuit for determining the peak level of the color content derived from the reference film; and a circuit for comparing the peak level of the color content derived from the first film to the peak level of the color content derived from the reference film.
Claim 2
Dependent Claim
83 words
Claim 2. The apparatus of claim 1 wherein said first circuit comprises a circuit for generating color representative first video signals corresponding to the color content of the first film and circuit for determining the peak level of the color representative first video signals; and wherein said second circuit comprises a circuit for generating color representative second video signals corresponding to the color content of the reference film and a circuit for determining the peak level of the color representative reference video signals.
Claim 3
Dependent Claim
33 words
Claim 3. The apparatus of claim 2 wherein said second circuit includes a circuit for averaging the video signals and a circuit for selecting the predetermined amplitude dependent upon the averaged video level.
Claim 4
Dependent Claim
64 words
Claim 4. An apparatus of claim 1 for exposing a film comprising: a circuit for determining the video level of the color content of the film; a circuit for comparing the video level to a reference; a light source generating a light output for exposing the film; and a circuit, responsive to the second circuit, for controlling the light output of the light source.
Claim 5
Dependent Claim
40 words
Claim 5. The apparatus of claim 4 wherein said circuit for comparing includes an averager for averaging the video level of the color content of the film and a selector for selecting the reference dependent upon the averaged video level.
Claim 6
Dependent Claim
98 words
Claim 6. The apparatus of claim 1 including: a color analyzer having a plurality of adjustable control elements for acting upon color representative video signals derived from a film to vary a video signal characteristic of the video signals and thereby vary the display of the video signal generated by the analyzer; and a first circuit for detecting the video level of the color representative video signals; said apparatus characterized by a second circuit for comparing the detected video level to a predetermined amplitude; and a third circuit, responsive to the second circuit, for adjusting the control elements.
Claim 7
Dependent Claim
26 words
Claim 7. The apparatus of claim 6 further comprising a fourth circuit for designating the color representative video signals which are detected by the first circuit.
Claim 8
Dependent Claim
33 words
Claim 8. The apparatus of claim 6 wherein said second circuit includes an averager for averaging the video signals and a circuit for selecting the predetermined amplitude dependent upon the averaged video level.
Claim 9
Dependent Claim
25 words
Claim 9. The apparatus of claim 8 further comprising fourth circuit for designating the color representative video signals which are detected by the first circuit.
Claim 10
Dependent Claim
116 words
Claim 10. The apparatus of claim 7 or 9 wherein said first circuit comprises a peak level video signal detector providing a peak level analog signal; wherein said second circuit comprises an analog-to-digital converter for converting the peak level analog signals into peak digital signals, a memory for storing digital information corresponding to the digital amplitudes of the predetermined amplitudes, and a computer for comparing the peak digital signals to the digital information stored in the memory; and wherein said third circuit comprises said computer providing a comparative signal output representing any difference between the peak digital signals and the digital information, and a fifth circuit for applying the comparative signal output to the control elements.
Claim 11
Dependent Claim
32 words
Claim 11. The apparatus of claim 10 wherein said fourth circuit comprises a sixth circuit for controlling the color representative video signals which are provided to the peak level video signal detector.
Claim 12
Dependent Claim
22 words
Claim 12. The apparatus of claim 11 wherein said sixth circuit for controlling is a gated generator synchronized with the color analyzer.
Claim 13
Dependent Claim
104 words
Claim 13. The apparatus of claim 7 wherein said color analyzer is for analyzing a film positive, the analyzer having a plurality of attenuators for acting upon yellow, magenta and cyan video signals derived from the positive, the attenuators varying the amplitudes of the yellow, magenta and cyan video signals and thereby varying the display corresponding to the positive generated by the analyzer; wherein said first circuit detects the peak amplitudes of the yellow, magenta and cyan video signals corresponding to the positive; wherein said second circuit compares the detected peak amplitudes to the predetermined amplitudes; and wherein said third circuit adjusts the attenuators.
Claim 14
Dependent Claim
23 words
Claim 14. The apparatus of claim 13 further comprising fourth circuit for designating the video signals which are detected by the first circuit.
Claim 15
Dependent Claim
126 words
Claim 15. The apparatus of claim 14 wherein said first circuit comprises a peak yellow video signal detector, a peak magenta video signal detector and a peak cyan video signal detector for providing a peak level analog signal; said second circuit comprising an analog-to-digital converter for converting the peak level analog signal into a corresponding peak digital signal, a memory for storing digital information corresponding to the digital amplitude of the predetermined amplitudes, and a computer for comparing the peak digital signals to the digital information stored in the memory; and wherein said third circuit comprises said computer providing a comparative signal output representing any difference between the peak digital signals and the digital information and a circuit applying the comparative signal output to the attenuators.
Claim 16
Dependent Claim
33 words
Claim 16. The apparatus of claim 15 wherein said fourth circuit comprises a circuit for controlling the yellow, magenta and cyan video signals which are provided to said peak level video signal detector.
Claim 17
Dependent Claim
21 words
Claim 17. The apparatus of claim 16 wherein said circuit for controlling is a gated generator synchronized with the color analyzer.
Claim 18
Dependent Claim
103 words
Claim 18. The apparatus of claim 7 wherein said color analyzer is for analyzing a film negative, the analayzer having a plurality of attenuators for acting upon yellow, magenta and cyan video signals derived from the negative, the attenuators varying the amplitudes of the yellow, magenta and cyan.video signals and thereby varying the display corresponding to the positive generated by the analyzer; wherein said first circuit detects the peak amplitudes of the yellow, magenta and cyan video signals corresponding to the positive; wherein said second circuit compares the detected peak amplitudes to the predetermined amplitudes; and wherein said third circuit adjusts the attenuators.
Claim 19
Dependent Claim
23 words
Claim 19. The apparatus of claim 18 further comprising fourth circuit for designating the video signals which are detected by the first circuit.
Claim 20
Dependent Claim
130 words
Claim 20. The apparatus of claim 19 wherein said first circuit comprises a peak yellow video signal detector, a peak magenta video signal detector and a peak cyan video signal detector for providing a peak black level analog signal; said second circuit comprising an analog-to-digital converter for converting the peak black level analog signal into a corresponding peak black digital signal, a memory for storing digital information corresponding to the digital amplitude of the predetermined amplitudes, and a computer for comparing the peak black digital signals to the digital information stored in the memory; and wherein said third circuit comprises said computer providing a comparative signal output representing any difference between the peak black digital signals and the digital information and means applying the comparative signal output to the attenuators.
Claim 21
Dependent Claim
32 words
Claim 21. The apparatus of claim 20 wherein said fourth circuit comprises a circuit for controlling the red, green and blue video signals which are provided to said peak video signal detector.
Claim 22
Dependent Claim
21 words
Claim 22. The apparatus of claim 21 wherein said circuit for controlling is a gated generator synchronized with the color analyzer.
Claim 23
Dependent Claim
99 words
Claim 23. A method of automatically analyzing the colors of a first film as compared to the colors of a reference film comprising the steps of: generating color representative reference video signals corresponding to colors of at least one reference film; determining the peak level of the color representative reference video signals; generating color representative first video signals derived from the color of the first film; determining the peak level of the color representative first video signals; and comparing the peak level of the color representative first video signals to the peak level the color representative reference video signals.
Claim 24
Dependent Claim
36 words
Claim 24. The method of claim 23 further comprising the steps of: averaging the color representative first video signals; and selecting the color representative reference video signals dependent upon the averaged color representative first video signals.
References Cited (Backward Citations)
No citation records indexed.
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