US 6,650,786 B2 · Image encoding apparatus and image decoding apparatus

Abstract

An input image is subjected to transform by a DCT transforming unit 20. A coefficient analyzing unit 30 compares a predetermined coefficient and coefficient data 120, and obtains low-frequency image data 150 of the input image by a high-frequency coefficient masking unit 50 and an inverse DCT unit 60 on the basis of a result of that comparison. A pixel subsampling unit 70 receives this low-frequency image data 150, and generates a subsampled image on the basis of the aforementioned result of comparison. The subsampled image and coefficient information are transmitted to a decoding side. A decoding apparatus decodes an image on the basis of the subsampled image and the coefficient information.

Claims7

Dependent claims

An image decoding apparatus comprising:

coefficient-information input means for inputting coefficient information;
subsampled-image input means for inputting a subsampled image;
coefficient interpolating means for interpolating a frequency component by a predetermined technique involving solving a set of linear equations in correspondence with the subsampled image inputted by said subsampled-image input means and the coefficient information inputted by said coefficient-information input means;
inversely transforming means for effecting inverse frequency transform so as to convert the frequency component interpolated by said coefficient interpolating means into an image;
and
decoded-image output means for outputting the image converted by said inversely transforming means.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application

10/228,992Filed 28 Aug 2002 · division

Priority

JP 8-28358125 Oct 1996

Published

US 2003/0007693 A19 Jan 2003

Granted

18 Nov 2003

Term ends

Not estimatedThe source records don’t support an estimate.

Classification13 codes

H04N 19/132
Characterised by the element, parameter or selection affected or controlled by the adaptive coding: sampling, masking or truncation of coding…
G06F 3/0338
Pointing devices displaced or positioned by the user , e.g. mice, trackballs, pens or joysticks; Accessories therefor: with detection of limited…
G06T 3/4084
Scaling of whole images or parts thereof, e.g. expanding or contracting: in the transform domain, e.g. fast Fourier transform [FFT] domain scaling
H01H 25/041
Operating part movable angularly in more than one plane, e.g. joystick: having a generally flat operating member depressible at different…

Image encoding apparatus and image decoding apparatus

Life of this patent

Image encoding apparatus and image decoding apparatus

Life of this patent

Abstract

Claims7