Shading elimination device for image read-out apparatus
AssigneeFuji Photo Film Co., Ltd.
InventorKazuo Horikawa
Life of this patent
Estimating the term…
Abstract
A shading elimination device comprises a memory for storing characteristics of shading in an image read-out apparatus, a sensitivity adjuster for adjusting the sensitivity of a photodetector of the image read-out apparatus or an image density adjuster for adjusting the density of an image reproduced by an image reproducing apparatus, and a control circuit. The control circuit receives a signal representing the shading characteristics from the memory, and controls the sensitivity adjuster or the image density adjuster to eliminate changes in the output of the photodetector caused by shading in the image read-out apparatus.
Claims12
A shading elimination device for an image read-out apparatus for scanning a recording medium carrying an image recorded thereon with a light beam, obtaining light carrying image information, guiding the light by a light guiding optical system, and detecting the guided light by a photodetector connected with the light guiding optical system,
- the shading elimination device comprising:
- (i) a storage means for storing characteristics of shading caused by intensity nonuniformity of said scanning light beam, scanning speed nonuniformity, light guiding nonuniformity of said light guiding optical system, sensitivity nonuniformity of said photodetector, or the like,
- (ii) a sensitivity adjustment means for adjusting the sensitivity of said photodetector, and
- (iii) a control circuit for receiving a signal representing said characteristics of shading from said storage means, and controlling said sensitivity adjustment means to eliminate a change in the output of said photodetector caused by said shading.
A shading elimination device for an image read-out apparatus in an image read-out and reproducing system constituted by an image read-out apparatus for scanning a recording medium carrying an image recorded thereon with a light beam, obtaining light carrying image information, guiding the light by a light guiding optical system, and detecting the guided light by a photodetector connected with the light guiding optical system, and an image reproducing apparatus connected with the image read-out apparatus for reproducing the image based on a read-out image signal generated by the image read-out apparatus,
- the shading elimination device comprising:
- (i) a storage means for storing characteristics of shading caused by intensity nonuniformity of said scanning light beam, scanning speed nonuniformity, light guiding nonuniformity of said light guiding optical system, sensitivity nonuniformity of said photodetector, or the like in said image read-out apparatus,
- (ii) an image density adjusting means for adjusting reproduced image density in said image reproducing apparatus, and
- (iii) a control circuit for receiving a signal representing said characteristics of shading from said storage means, and controlling said image density adjusting means to eliminate a change in the output of said photodetector caused by said shading in said image read-out apparatus.
Dependencies are inferred from the claim text.