Imaging print media
AssigneeHewlett-Packard Development Company, L.P.
InventorsXavier Alonso, Elisa Serra, Llorenç Vallès
Life of this patent
Estimating the term…
Abstract
A method and apparatus for imaging material. A section of a medium is photographed with a first camera having a first field of view. The medium is advanced along a feed direction and the section is photographed with a second camera having a second field of view. At least one of the first field of view and the second field of view is shifted from a nominal location by one or more reflective surfaces. An actual advance of the medium is compared with an intended advance of the medium and it is determined whether at least one of a media advance error and a dimensional change in the media exists in response to the comparing step.
Claims40
A method of imaging material, said method comprising:
- photographing a section of a medium with a first camera having a first field of view;
- advancing said medium along a feed direction;
- photographing said section with a second camera having a second field of view, wherein at least one of said first field of view and said second field of view is shifted from a nominal location by one or more reflective surfaces;
- comparing an actual advance of said medium with an intended advance of said medium;
- and
- determining whether at least one of a media advance error and a dimensional change in said media exists in response to said comparing step.
A system for imaging print media configured to advance along a feed direction, said system comprising:
- a first camera assembly including a first camera having a first field of view and at least one reflecting surface configured to shift said first field of view from a nominal location;
- a second camera assembly having a second camera;
- and
- a computer configured to receive images photographed by said first camera and said second camera, said computer also being configured to determine a vector indicating a distance traveled by a section of the print media photographed by the first camera and the second camera.
An apparatus for determining errors during printing operations of a printing device, said printing device having a media feed direction, said apparatus comprising:
- a first camera assembly having a camera with a first field of view and at least one reflective surface to deflect the first field of view from a nominal location;
- a second camera assembly having a camera with a second field of view;
- wherein said first camera and said second camera are configured to photograph a section of media contained in the printing device;
- and
- wherein said second camera assembly is positioned at a location substantially downstream of the first camera assembly along said media feed direction of the printing device.
An apparatus for imaging print media, said apparatus comprising:
- first means for photographing a section of said print media, said first photographing means having a first field of view;
- second means for photographing said section of said print media, said second means having a second field of view;
- means for deflecting said first field of view from a nominal location toward said second nominal field of view;
- and
- means for determining whether at least one of a media advance error and a dimensional change in said media exists.
A computer readable storage medium on which is embedded one or more computer programs, said one or more computer programs implementing a method for imaging material, said one or more computer programs comprising a set of instructions for:
- photographing a section of a medium with a first camera having a first field of view;
- advancing said medium along a feed direction;
- photographing said section with a second camera having a second field of view, wherein at least one of said first field of view and said second field of view is shifted from a nominal location by one or more reflective surfaces;
- comparing an actual advance of said medium with an intended advance of said medium;
- and
- determining whether at least one of a media advance error and a dimensional change in said media exists in response to said comparing step.
Dependencies are inferred from the claim text.