SYSTEM AND METHOD FOR SCENE CHANGE TRIGGERING
First Claim
1. A system for detecting a form within a scene that is still, the system comprising:
- a camera that accepts light reflected from a scene and converts it into video frames, each frame comprising a stream of pixels;
wherein each pixel has a gray scale range of light intensities from first to second light intensity levels,processing electronics that receive the stream of pixels and generate a histogram therefrom;
a comparator that compares a portion of the first light intensity pixels in the histogram from a series of frames, wherein when the when the portion remains about constant the form is determined to be still.
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Accused Products
Abstract
A triggering system and process for a form reader is shown using a histogram of the optical scene. The form reader is open on three sides with a camera facing a platen on to which a form is placed. The camera converts the light rays reflected from the platen into a video stream that is sent to a processor. A change in content of a first light intensity level contrasted to the content of a second light intensity level is used to determine when the form enters the scene. Illustratively, the first light intensity level represents black levels and the second light intensity levels represent white levels. A threshold is pre-determined that isolates the first light intensity content, and when the first light intensity content remains constant (after the presence of a form) the form is deemed to be still wherein the system may then read the information on the form.
83 Citations
14 Claims
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1. A system for detecting a form within a scene that is still, the system comprising:
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a camera that accepts light reflected from a scene and converts it into video frames, each frame comprising a stream of pixels;
wherein each pixel has a gray scale range of light intensities from first to second light intensity levels,processing electronics that receive the stream of pixels and generate a histogram therefrom; a comparator that compares a portion of the first light intensity pixels in the histogram from a series of frames, wherein when the when the portion remains about constant the form is determined to be still. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A process for detecting a form within a scene that is still, the process comprising the steps of:
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accepting light reflected from a scene and converting it into video frames, each frame comprising a stream of pixels, wherein each pixel has a gray scale range of light intensities from first light intensity levels to second light intensity levels; processing the stream of pixels and generating a histogram therefrom; and comparing a portion of the first light intensity pixels in the histogram from a series of frames, wherein when the when the portion remains about constant the form is determined to be still. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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Specification