High resolution film scanner
AssigneeRank Cintel Limited
InventorsPeter Richard Swinson, Graham Malcolm Alexander Barber
Life of this patent
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Abstract
A film scanner scans a frame of film three times by reciprocating a clapper gate assembly (160) holding the film (50) past a solid state line array sensor (210). Successive scans are in an opposite sense to the previous scan and R,G,B filter wheel (40) is placed in the optical path and advanced for each scan so that separate high resolution R,G and B scan are produced which can be combined to form a high resolution video signal.
Claims16
A film scanner comprising a scanning means comprising:
- a light source;
- a light sensitive line sensor;
- a film gate assembly for advancing film past said light sensitive line sensor and arranged between said light source and said light sensitive line sensor and having means for holding film fast with respect thereto;
- means for moving said film gate assembly past said light sensitive line sensor to scan film held in said film gate assembly;
- a position sensor for sensing the precise location of said film gate assembly with respect to said light sensitive line sensor;
- and
- control means for controlling data when data from the light sensitive line sensor is read in accordance with data from said position sensor.
A film scanner comprising a scanning means comprising:
- a light source;
- a light sensitive line sensor;
- a film gate assembly for advancing film past said light sensitive line sensor and arranged between said light source and said light sensitive line sensor and having means for holding film fast with respect thereto;
- means for moving said film gate assembly past said light sensitive line sensor to scan film held in said film gate assembly;
- a plurality of filters insertable into an optical path between said light source and said film gate assembly, wherein each frame of film is scanned a plurality of times each scan being performed with a different one of said plurality of filters inserted into said optical path, and said film gate assembly moving, for each scan after the first, in a direction opposite to that of the previous scan.
A film scanner comprising a scanning means comprising:
- a light source;
- a light sensitive line sensor;
- a film gate assembly for advancing film past said light sensitive line sensor and arranged between said light source and said light sensitive line sensor and having means for holding film fast with respect thereto;
- and
- means for moving said film gate assembly past said light sensitive line sensor to scan film held in said film gate assembly, wherein said film gate assembly is mounted on guide bushes to constrain movement in directions orthogonal to the direction in which film is advanced past the scanner.
A film scanner comprising a scanning means comprising:
- a light source;
- a light sensitive line sensor;
- a film gate assembly for advancing film past said light sensitive line sensor and arranged between said light source and said light sensitive line sensor and having means for holding film fast with respect thereto, said film gate assembly comprising an anti-rotation arm;
- and
- means for moving said film gate assembly past said light sensitive line sensor to scan film held in said film gate assembly.
A method of scanning film with a film scanner, said film scanner comprising:
- a scanning means;
- a light source;
- a light sensitive line sensor;
- and
- a film gate assembly for advancing film past said light sensitive line sensor and interposed between said light source and said light sensitive line sensor;
- said method comprising:
- holding frames of film to be scanned in said film gate assembly;
- performing a first scan by scanning a frame of film by moving said film gate assembly past said light sensitive line sensor in a first direction;
- performing a second scan of said frame of film by moving said film gate assembly past said light sensitive line sensor in a second opposite direction;
- and
- performing a third scan of said frame of film by moving said film gate assembly past said light sensitive line sensor in said first direction.
Dependencies are inferred from the claim text.