Image processing device eliminating background noise
AssigneeRicoh Company, Ltd.
InventorsKouichi Narahara, Satoshi Ohuchi
Life of this patent
Estimating the term…
Abstract
An image processing device forming a reproduced image from a plurality of color recording signals, each of which is generated at a corresponding one of scans on an original image and derived from color digital signals obtained at the corresponding one of the scans, includes a threshold-value generation unit generating a threshold value based on the color digital signals at a first one of the scans, and a background removal unit reducing background noise in the reproduced image by using the threshold value at second and following ones of the scans.
Claims18
An image processing device forming a reproduced image from a plurality of color recording signals, each of which is generated at a corresponding one of scans on an original image and derived from color digital signals obtained at said corresponding one of said scans, said image processing device comprising:
- a threshold-value generation unit generating a threshold value taking into account image characteristics of an entire image of said original image, said threshold value being obtained based on said color digital signals at a first one of said scans which is not a prescan;
- and
- a background removal unit reducing background noise in said reproduced image by employing different threshold operations between said first one of said scans and second and following ones of said scans, said threshold value taking into account image characteristics of an entire image of said original image being used at said second and following ones of said scans.
An image processing device comprising:
- input means for reading an original image to produce digital image data;
- picture/letter area detection means for detecting picture/letter areas each of which is either a picture area or a letter area;
- target-area detection means, responsive to said picture/letter area detection means, for identifying portions of said digital image data which are placed between said picture/letter areas;
- background-density detection means for detecting a background density of said digital image data by using said portions;
- background removal means for eliminating background noise by using said background density;
- and
- output means for generating a reproduced image in which said background noise is eliminated.
An image processing device comprising:
- input means for reading an original image to produce digital image data;
- picture/letter area detection means for detecting picture/letter areas each of which is either a picture area or a letter area;
- target-area detection means, responsive to said picture/letter area detection means, for identifying portions of said digital image data which are in proximity of said picture/letter areas;
- background-density detection means for detecting a background density of said digital image data by using said portions;
- background removal means for eliminating background noise by using said background density;
- and
- output means for generating a reproduced image in which said background noise is eliminated.
Dependencies are inferred from the claim text.