Methods of discriminating and copying an image
AssigneeKonishiroku Photo Industry Co., Ltd.
InventorsMasahiko Matsunawa, Yoshinori Abe
Life of this patent
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Abstract
A method of discriminating an image by scanning an original image with a photoelectric conversion device, quantizing an image signal obtained through the photoelectric conversion device, preparing a density histogram corresponding to the quantized image signal, detecting a peak density value corresponding to the peak present on the low-density side of the density histogram and a density width of the density histogram, and discriminating the original image according to both the peak density value and the density width.
Claims22
A method of discriminating a density characteristic of an image which comprises:
- scanning an original image with a photoelectric conversion device,
- quantizing an image signal based upon the output obtained through the photoelectric conversion device,
- preparing a density histogram representing effective reflection density on one axis and frequency on another axis corresponding to said quantized image signal,
- detecting a peak density value corresponding to a peak present on said density histogram relative to the effective reflection density axis of said histogram, and detecting a density width value for a range of reflection density values covered by said density histogram, and
- discriminating said original image according to both said peak density value and said density width value.
A method of copying an image which comprises:
- scanning an original image with a photoelectric conversion device,
- quantizing an image signal based upon the output obtained through said photoelectric conversion device,
- preparing a density histogram representing effective reflection density on one axis and frequency on another axis corresponding to said quantized image signal,
- detecting a peak density value corresponding to a peak present on said density histogram relative to the effective reflection density axis of said histogram, and detecting a density width value for a range of reflection density values covered by said density histogram, and
- controlling at least one of, or a combination of, the setting values of the conditions of the charging, exposure, and developing processes according to both said peak density value and said density width value of the density histogram.
Dependencies are inferred from the claim text.