Abstract: A sheet recognizing device and method for precisely checking the authentication of a sheet by performing recognition of color and watermark of a sheet and detecting the subtle characteristic of a hue ink printed on one side of the sheet.

Abstract: A sheet recognizing device and method for precisely checking the authentication of a sheet by performing recognition of color and watermark of a sheet and detecting the subtle characteristic of a hue ink printed on one side of the sheet.

Abstract: A sheet identifying device and method for identifying the kind of sheet or checking a sheet correctly by reducing the adverse influence of the wrinkle and stain of the sheet and of the displacement of a watermark pattern from the watermark area. A transmission optical sensor (8) images a sheet. A watermark area extracting section (12) extracts image data on a watermark area. A watermark area gravity center calculating section (13) calculates the center of gravity of the watermark area. A watermark pattern displacement calculating section (14) calculates the displacement of the watermark pattern from the center of gravity. An identification object image extracting section (15) extracts identification object image data with reference to the displacement. A scratch/stain detecting section (7) calculates the difference between the identification image data and a true template to extract an image of a scratch and stain.

Abstract: A sheet identifying device and method for identifying the kind of sheet or checking whether a sheet is a genuine or counterfeit one correctly without influence of the state of the sheet. Data on the image of a sheet is acquired, and the image data is binarized according to a watermark region extraction threshold. Image data on the watermark region is extracted according to the sheet image data. The watermark region image data is binarized according to a watermark pattern extraction threshold. The center of gravity of the watermark region is calculated on the basis of the watermark region image data. The watermark region image data is divided into divisions using the center of gravity of the watermark region as the origin. From the watermark region image data, image data on a predetermined specific region is extracted. Values of distinctive features such as the center of gravity and area of the watermark pattern included in the specific region image data are extracted.

Abstract: A light-shielding container for a light-sensitive material has a light-shielding cloth attached to an opening in the container through which the light-sensitive material is passed. The light-shielding cloth shields the opening from light and is formed from a base fabric and a pile section. The pile section includes black dope-dyed threads formed by incorporating black dope-dyed threads containing carbon black into the base fabric and black-dyed threads formed by incorporating black-dyed threads. The proportion of the black dope-dyed threads in the total pile is 5 wt % to 60 wt %. The single filament fineness of the black dope-dyed threads is thicker than that of the black-dyed threads. The overall pile density of the black dope-dyed threads and the black-dyed threads is 30,000 to 55,000 filaments/cm2. The black dope-dyed threads and the black-dyed threads are arranged in stripes substantially orthogonal to the direction in which the light-sensitive material is passed.

Abstract: A light-shielding cloth to be fitted to a photographic film cartridge at its slit through which a film is draw out, which does not produce defects in photographic images, particularly defects in enlarged photographic images, is prepared by subjecting a cloth to raising treatment and has fiber wastes remaining on its surface cloth in a of 30 pieces per 1 cm2 or less.

Abstract: A light-shielding cloth that is to be bonded to a slit-form opening of a container for a photosensitive material is formed from a base fabric and a crimped pile thread incorporated into the base fabric so that the pile density is in the range from 45,000 filaments/cm2 to 85,000 filaments/cm2, a hot-melt adhesive region being provided on the reverse side of the base fabric without a filling agent being applied thereto for the purpose of preventing the hot-melt adhesive from penetrating the base fabric. A container for a photosensitive material is formed by bonding the light-shielding cloth to a slit-form opening using a 100% solids adhesive, preferably an ethylene-vinyl acetate copolymer resin based adhesive, without a treatment with a filling agent. A narrow-width light-shielding ribbon is formed by slitting the light-shielding cloth by means of an ultrasonic slitter.

Abstract: A light-shielding container for a light-sensitive material has a light-shielding cloth attached to an opening in the container through which the light-sensitive material is passed. The light-shielding cloth shields the opening from light and is formed from a base fabric and a pile section. The pile section includes black dope-dyed threads formed by incorporating black dope-dyed threads containing carbon black into the base fabric and black-dyed threads formed by incorporating black-dyed threads. The proportion of the black dope-dyed threads in the total pile is 5 wt % to 60 wt %. The single filament fineness of the black dope-dyed threads is thicker than that of the black-dyed threads. The overall pile density of the black dope-dyed threads and the black-dyed threads is 30,000 to 55,000 filaments/cm2. The black dope-dyed threads and the black-dyed threads are arranged in stripes substantially orthogonal to the direction in which the light-sensitive material is passed.

Abstract: A light-shielding cloth that is to be bonded to a slit-form opening of a container for a photosensitive material is formed from a base fabric and a crimped pile thread incorporated into the base fabric so that the pile density is in the range from 45,000 threads/cm2 to 85,000 threads/cm2, a hot-melt adhesive region being provided on the reverse side of the base fabric without a filling agent being applied thereto for the purpose of preventing the hot-melt adhesive from penetrating the base fabric. A container for a photosensitive material is formed by bonding the light-shielding cloth to a slit-form opening using a 100% solids adhesive, preferably an ethylene-vinyl acetate copolymer resin based adhesive, without a treatment with a filling agent. A narrow-width light-shielding ribbon is formed by slitting the light-shielding cloth by means of an ultrasonic slitter.