EP0219989A2
Expired / Lapsed
EP
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Color hard copy system
Assignee: Seiko Instruments Inc
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Filing: 1986-09-26
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Granted: —
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Expires: 2006-09-26
Abstract
Abstract A colour hard copy system for producing a colour hard picture from colour video signals is characterised by the provision in combination of a front end circuit (4) to which the video signals are fed and in which they are converted into digital signals and sampled by a plurality of threshold values from a threshold voltage generating circuit (10); a picture memory (8) in which picture information output digital signals produced by said end circuit (4) are written in by prescribed write in addresses from a write-in address control circuit (19) said write-in addresses being based on a selected method of representation of a multi-colour gradation picture; a read-out control circuit (33) for reading out picture data from the memory (8) based on said selected method of representation; and a coloured picture printer (28) for printing signals derived from the read out signals from the memory (8).
Inventors
- 👤 Kaneo Seiko Instruments & Electronics Yamagushi
- 👤 Fumihiro Seiko Instruments & Electronics Tanaka
- 👤 Yoshio Seiko Instruments & Electronics Shimada
- 👤 Kenichi Seiko Instruments & Elect. Matsushima
- 👤 Shinya Seiko Instruments & Elect. Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 05:22
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/46; H04N1/52; H04N1/40; H04N1/405; H04N1/4051
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
147 words
A colour hard copy system for producing a colour hard picture from colour video signals characterised by the provision in combination of a front end circuit (4) to which the video signals are fed and in which they are converted into digital signals and sampled by a plurality of threshold values from a threshold voltage generating circuit (10); a picture memory (8) in which picture information output digital signals produced by said front end circuit (4) are written in by prescribed write in addresses from a write-in address control circuit (19), said write-in addresses being based on a selected method of representation of a multi-colour gradation picture; a read-out control circuit (33) for reading out picture data from the memory (8) based on said selected method of representation; and a coloured picture printer (28) for printing signals derived from the read out signals from the memory (8).
Claim 2
Dependent Claim
147 words
A colour hard copy system for producing a colour hard picture from colour video signals characterised by the provision in combination of a front end circuit (4) to which the video signals are fed and in which they are converted into digital signals and sampled by a plurality of threshold values from a threshold voltage generating circuit (10); a picture memory (8) in which picture information output digital signals produced by said front end circuit (4) are written in by prescribed write in addresses from a write-in address control circuit (19), said write-in addresses being based on a selected method of representation of a multi-colour gradation picture; a read-out control circuit (33) for reading out picture data from the memory (8) based on said selected method of representation; and a coloured picture printer (28) for printing signals derived from the read out signals from the memory (8).
Claim 3
Dependent Claim
25 words
A system as claimed in claim 1 wherein said selected method of representation of a multi-colour picture is in accordance with a density pattern method.
Claim 4
Dependent Claim
12 words
A system as claimed in claim 2 with an organised dither method.
Claim 5
Independent Claim
132 words
A system as claimed in any of the preceding claims and further characterised in that the video signals are red, green and blue (R, G, B) signals; the read out signals from the memory (8) are supplied to the printer (28) via an RGB/YMC (yellow, magenta and cyan) conversion circuit (24); a read-out address generating circuit (30) counts clock signals from the printer (28) and supplies intermediate addresses to the read-out control circuit (33); sampling is effected by a sampling clock signal supplied by a sampling clock generating circuit (14) and supplying its output to the front end circuit (4) and to a write-in address generating circuit (16) feeding into the write-in address control circuit (19); and the circuits (10), (4), (14), (19), (33) and (24) are controlled by a controller (36).
Claim 6
Independent Claim
112 words
A method of producing a colour hard picture from colour video signals (R, G, B) characterised in that said signals are converted into sampled digital signals (RIN, GIN and BIN) by sampling by threshold voltages which are varied statically; said signals (RIN, GIN and BIN) are written into a picture memory (8) in accordance with a selected method of picture representation of a multi-colour gradation picture by write-in addresses corresponding to the threshold voltage values present at the time; reading out signals (ROUT, GOUT and BOUT) from the memory (8) by read-out addresses corresponding to the method of representation adopted; and utilising the read-out signals to operate a coloured picture printer (28).
Claim 7
Independent Claim
112 words
A method of producing a colour hard picture from colour video signals (R, G, B) characterised in that said signals are converted into sampled digital signals (RIN, GIN and BIN) by sampling by threshold voltages which are varied statically; said signals (RIN, GIN and BIN) are written into a picture memory (8) in accordance with a selected method of picture representation of a multi-colour gradation picture by write-in addresses corresponding to the threshold voltage values present at the time; reading out signals (ROUT, GOUT and BOUT) from the memory (8) by read-out addresses corresponding to the method of representation adopted; and utilising the read-out signals to operate a coloured picture printer (28).
Claim 8
Dependent Claim
33 words
A method as claimed in claim 5 wherein the output signals (ROUT, GOUT and BOUT) from the memory (8) are converted into yellow, magenta and cyan (YMC) signals before feeding into the printer.
Claim 9
Dependent Claim
108 words
A colour hard copy system characterised by having: a. video signals comprising R (red), G (green) and B (blue); b. a picture memory storing picture information according to these video signals; c. a threshold control circuit sampling said video signals by a plurality of threshold values and converting the same into digital signals; d. a means of writing said digital signals in the picture memory by prescribed write-in addresses based on a method of representation of a multi-colour gradation picture; and e. a means of reading picture data out of the picture memory and printing the same based on the method of representation of a multi-colour gradation picture.
Claim 10
Dependent Claim
108 words
A colour hard copy system characterised by having: a. video signals comprising R (red), G (green) and B (blue); b. a picture memory storing picture information according to these video signals; c. a threshold control circuit sampling said video signals by a plurality of threshold values and converting the same into digital signals; d. a means of writing said digital signals in the picture memory by prescribed write-in addresses based on a method of representation of a multi-colour gradation picture; and e. a means of reading picture data out of the picture memory and printing the same based on the method of representation of a multi-colour gradation picture.
References Cited (Backward Citations)
No citation records indexed.
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