Image signal processing apparatus
First Claim
1. An image signal processing apparatus for converting an image data signal input by an image input terminal into another image data signal suitable for an image output terminal;
- comprising;
noise generating means for generating a quantity of noise of a spatial frequency characteristic difficult to visually perceive in accordance with a level of the input image data signal, wherein the noise generating means generates noise of a frequency equal to or lower than a fundamental frequency of a screen generated by half-tone generating means in said image output terminal; and
noise superposing means for superposing only the noise generated by said noise generating means on the input image data signal.
1 Assignment
0 Petitions
Accused Products
Abstract
An image signal processing apparatus for converting an image data signal input by an image input terminal into another image data signal suitable for an image output terminal. In the apparatus, a quantity of noise of a spatial frequency characteristic difficult to visually perceive is generated in accordance with a level of the input image data signal, and the noise generated is superposed on the input image data signal. In handling a color image data signal, the noise is superposed on the color image data signal in a regional color space difficult to visually perceive.
-
Citations
8 Claims
-
1. An image signal processing apparatus for converting an image data signal input by an image input terminal into another image data signal suitable for an image output terminal;
- comprising;
noise generating means for generating a quantity of noise of a spatial frequency characteristic difficult to visually perceive in accordance with a level of the input image data signal, wherein the noise generating means generates noise of a frequency equal to or lower than a fundamental frequency of a screen generated by half-tone generating means in said image output terminal; and noise superposing means for superposing only the noise generated by said noise generating means on the input image data signal. - View Dependent Claims (2, 3)
- comprising;
-
4. An image signal processing apparatus for converting a color image data signal input by an image input terminal into another color image data signal suitable for an image output terminal, comprising:
-
noise generating means for generating a quantity of noise of a spatial frequency characteristic difficult to visually perceive in accordance with a level of the input color image data signal, wherein the noise generating means generates noise of a frequency equal to or lower than a fundamental frequency of a screen generated by half-tone generating means in said image output terminal; and noise superposing means for superposing only the noise generated by said noise generating means on the color image data signal in a regional color space difficult to visually perceive. - View Dependent Claims (5, 6, 7, 8)
-
Specification