Image processing device using high frequency component suppression
First Claim
1. An image processing device which receives digital image data compressed in a form based on frequency components and applies signal processing to said digital image data, said processing device comprising:
- a frequency-component extracting unit extracting said frequency components of intra-frame coding pictures and inter-frame coding pictures from said digital image data when in a first mode, and said frequency components of said intra-frame coding pictures from said digital image data when in a second mode, said frequency components being compressed in a form based on said frequency components;
a high-frequency suppressing unit suppressing said frequency components if said frequency components are higher than a predetermined frequency;
a transformation unit transforming said digital image data from a frequency domain into a spatial domain to produce spatial-domain images; and
a decimating unit decimating pixels of said spatial-domain images only when in said second mode at a predetermined decimation rate to generate size-reduced images.
1 Assignment
0 Petitions
Accused Products
Abstract
An image processing device which receives digital image data compressed in a form of frequency components and applies signal processing to the digital image data is disclosed. The image processing device includes a frequency-component extracting unit extracting the frequency components from the digital image data compressed in a form of the frequency components, a high-frequency suppressing unit suppressing the frequency components if the frequency components are higher than a predetermined frequency, a transformation unit transforming the digital image data from a frequency domain into a spatial domain to produce spatial-domain images, and a decimating unit decimating pixels of the spatial-domain images at a predetermined decimation rate to generate size-reduced images.
38 Citations
14 Claims
-
1. An image processing device which receives digital image data compressed in a form based on frequency components and applies signal processing to said digital image data, said processing device comprising:
-
a frequency-component extracting unit extracting said frequency components of intra-frame coding pictures and inter-frame coding pictures from said digital image data when in a first mode, and said frequency components of said intra-frame coding pictures from said digital image data when in a second mode, said frequency components being compressed in a form based on said frequency components; a high-frequency suppressing unit suppressing said frequency components if said frequency components are higher than a predetermined frequency; a transformation unit transforming said digital image data from a frequency domain into a spatial domain to produce spatial-domain images; and a decimating unit decimating pixels of said spatial-domain images only when in said second mode at a predetermined decimation rate to generate size-reduced images. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A method of generating size-reduced images in an image processing device which receives digital image data compressed in a form based on frequency components and applies signal processing to said digital image data, said method comprising the steps of:
-
extracting said frequency components of intra-frame coding pictures and inter-frame coding pictures from said digital image data when in a first mode, and extracting said frequency components of said intra-frame coding pictures from said digital image data when in a second mode, said frequency components being compressed in a form based on said frequency components; suppressing said frequency components if said frequency components are higher than a predetermined frequency only when in said second mode; transforming said digital image data from a frequency domain to a spatial domain to produce spatial-domain images; decimating pixels of said spatial-domain images at a predetermined decimation rate to generate size-reduced images only when in said second mode. - View Dependent Claims (9, 10, 11, 12, 13, 14)
-
Specification