Image processing scheme
AssigneeRicoh Company, Ltd.
InventorHiroyuki Sakuyama
Life of this patent
Estimating the term…
Abstract
At least the deviation on a pixel having a value deviating from a predetermined range through inverse transform of image data from a frequency domain is reduced, wherein a pixel which should have a value changed in a direction reverse to the deviation is determined based on a character of the inverse transform.
Claims31
An image data processing apparatus comprising:
- a part at least reducing the deviation on a pixel having a value deviating from a predetermined range through inverse transform of image data from a frequency domain;
- and
- a part determining a pixel which should have a value changed in a direction reverse to the deviation based on a character of the inverse transform.
The image data processing apparatus as claimed in clam 2, wherein the character of the inverse transform used by said determining part further comprises absolute values of the elements of the matrix through which the inverse transform is performed.
An image data processing method comprising the steps of:
- a) at least reducing the deviation on a pixel having a value deviating from a predetermined range through inverse transform of image data from a frequency domain;
- and
- b) determining a pixel which should have a value changed in a direction reverse to the deviation based on a character of the inverse transform.
An information recording medium having a software program recorded therein, the software program causing a computer to execute the steps of:
- a) at least reducing the deviation on a pixel having a value deviating from a predetermined range through inverse transform of image data from a frequency domain;
- and
- b) determining a pixel which should have a value changed in a direction reverse to the deviation based on a character of the inverse transform.
A software program causing a computer to execute the steps of:
- a) at least reducing the deviation on a pixel having a value deviating from a predetermined range through inverse transform of image data from a frequency domain;
- and
- b) determining a pixel which should have a value changed in a direction reverse to the deviation based on a character of the inverse transform.
Dependencies are inferred from the claim text.