Retrieval system
AssigneeCanon Kabushiki Kaisha
InventorsMasami Maetani, Katsuhiko Okitsu
Life of this patent
Estimating the term…
Abstract
A film retrieval system comprises a light source for illuminating a film having marks applied thereon, a photo-detector for detecting light intensity transmitted from the illuminated film, a device for determining a reference in accordance with the light intensity detected by the photo-detector, a discriminator for determining the presence or absence of the mark by comparing the reference determined by the reference device and an output of the photo-detector and, a setting device for setting a detection point of the transmitted light intensity by the photo-detector at any point spaced from a leading edge of the film.
Claims13
A film retrieval system comprising:
- transport means for transporting an elongated film provided with marks corresponding to images from a supplying portion through an illumination position to a winding portion along a transport direction;
- a light source for illuminating a film positioned at the illumination position;
- detecting means for detecting the intensity of light transmitted through the film positioned at the illumination position;
- reference means for determining a reference in accordance with the light intensity detected by said detecting means;
- discriminating means for determining the presence or absence of the mark on the basis of the reference determined by said reference means;
- and
- setting means for setting a timing of detection by said detecting means in order to detect the light intensity transmitted through the film at a position distant from a leading end of the film by any selected distance with respect to the transport direction of the film.
A film retrieval system for retrieving a desired image on a film provided with a number of images and marks for retrieval, comprising:
- transport means for transporting a film across an illumination path;
- a light source for illuminating the film positioned at the illumination path;
- detecting means for detecting the intensity of light transmitted through a portion of the film where the mark is provided and a portion of the film where no mark is provided, which film is positioned at the illumination position;
- reference means for determining a reference on the basis of output from said detecting means;
- discriminating means for discriminating the presence or absence of the mark by comparing the reference determined by said reference means and the output from said detecting means;
- count means for counting the marks discriminated by said discriminating means;
- and
- setting means for setting a time for starting the operation of said detecting means in order to detect the intensity of light transmitted through the film at a position distant from a leading end of the film by any selected distance.
Dependencies are inferred from the claim text.