Original size detecting apparatus, original size detecting method, and program for original size detection
AssigneeCanon Kabushiki Kaisha
InventorsKatsuhiro Ishido, Takashi Soya
Life of this patent
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Abstract
An original size detecting apparatus is capable of carrying out accurate original size detection without erroneous detection of the size of an original due to the influence of external scattered light. A CCD reads reflected light of light irradiated from a light source onto an original placed on an original platen glass. Optical sensors detect two open states of the original presser plate, and a scanner controller performs predetermined control corresponding to each of the open states of the original presser plate detected by the optical sensors, to determine the size of the original based on the result of the reading by the CCD.
Claims10
An original size detecting apparatus comprising:
- an original platen;
- a light source that illuminates an original placed on said original platen;
- a reading device that reads the original based on light reflected from the illuminated original;
- a first detecting device that detects whether or not a dimension of the original in a sub-scanning direction is equal to or smaller than a predetermined dimension;
- a second detecting device that detects a dimension of the original in a main-scanning direction orthogonal to the sub-scanning direction;
- and
- a determining device that determines a size of the original based on results of detections by said first and second detecting devices,
- wherein said second detecting device carries out a first original size-determining process when at least one of output values of said reading device at a plurality of positions in the main-scanning direction with said light source turned off is smaller than a predetermined output value, and carries out a second original size-determining process when all the output values of said reading device at the plurality of positions in the main-scanning direction with the light source turned off are larger than the predetermined output value.
An original size detecting method applied to an original size detecting apparatus including an original platen, and a light source that illuminates an original placed on said original platen,
- the method comprising:
- a reading step of reading, by a reading device, the original based on light reflected from the illuminated original;
- a first detecting step of detecting, by a first detecting device, whether or not a dimension of the original in a sub-scanning direction is equal to or smaller than a predetermined dimension and generating an output indicative of a result of the detection;
- a second detecting step of detecting, by a second detecting device, a dimension of the original in a main-scanning direction orthogonal to the sub-scanning direction and generating an output indicative of a result of the detection;
- and
- a determining step of determining, by a determining device a size of the original based on results of detections in said first and second detecting steps, and
- wherein said second detecting step comprises carrying out a first original size-determining process when at least one of output values of said reading step at a plurality of positions in the main-scanning direction with said light source turned off is smaller than a predetermined output value, and carrying out a second original size-determining process when all the output values of said reading step at the plurality of positions in the main-scanning direction with the light source turned off are larger than the predetermined output value.
A non-transitory computer-readable medium including an original size detecting program that can be executed by an original size detecting apparatus including an original platen, and a light source that illuminates an original placed on said original platen,
- the program comprising:
- a reading module for reading the original based on light reflected from the illuminated original;
- a first detecting module for detecting whether or not a dimension of the original in a sub-scanning direction is equal to or smaller than a predetermined dimension and generating an output indicative of a result of the detection;
- a second detecting module for detecting a dimension of the original in a main-scanning direction orthogonal to the sub-scanning direction and generating an output indicative of a result of the detection;
- and
- a determining module for determining a size of the original based on results of detections by said first and second detecting modules,
- wherein said second detecting module carries out a first original size-determining process when at least one of output values of said reading module at a plurality of positions in the main-scanning direction with said light source turned off is smaller than a predetermined output value, and carries out a second original size-determining process when all the output values of said reading module at the plurality of positions in the main-scanning direction with the light source turned off are larger than the predetermined output value.
A document reading apparatus comprising:
- a platen;
- a light source that illuminates a document placed on the platen;
- a photoelectric conversion device that receives light from the document and then converts the received light to output data;
- and
- a size determining unit that
- determines whether or not all first output data of said photoelectric conversion device at a plurality of different positions in a predetermined direction with said light source turned off are larger than a predetermined threshold value,
- determines the size of the document in the predetermined direction based on the first output data when all the first output data are larger than the predetermined threshold value;
- and
- determines that the size of the document in the predetermined direction based on the second output data of said photoelectric conversion device with the light source turned on at the positions other than the positions corresponding to the first output data larger than the threshold value, out of the plurality of the positions when the at least one of the first output data is smaller than the predetermined value.
Dependencies are inferred from the claim text.