US 2004/0062316 A1 · Method for pre-suppressing noise of image

Abstract

A method for pre-suppress noise of an image at least includes the following steps: detecting whether the currently processed DCT coefficient value is equal to or less than a corresponding threshold used for this time during quantizing DCT (Discrete Cosine Transform) coefficients of a CIF (Common Intermediate Format) image blocks in sequence, if it is, setting the DCT coefficient to zero, then increasing the threshold of this time to be used as a threshold of next time for the DCT coefficient processing, otherwise recovering the threshold used for this time to a predetermined initial threshold, which will be used as the next time threshold for the next processing of DCT coefficient; detecting whether the increased threshold is greater than a predetermined upper limit of a threshold, if it is, substituting the increased threshold with the predetermined upper limit.

Claims8

Dependent claims

A method for pre-suppressing noise of an image, processing a DCT (Discrete Cosine Transform) coefficient value in sequence during quantizing the DCT coefficients value of a CIF (Common Intermediate Format) image blocks, comprises the steps of:

detecting whether the currently processed DCT coefficient value is equal to or less than a corresponding threshold used for this time, if it is, setting the DCT coefficient value to zero, then increasing the threshold of this time to be used as a threshold for the next processing of DCT coefficient, otherwise recovering the threshold of this time to be used as a threshold for the next processing of DCT coefficient to a predetermined initial threshold;
detecting whether the increased threshold is greater than a predetermined upper limit of a threshold, if it is, substituting the increased threshold with the predetermined upper limit.

Dependencies are inferred from the claim text.

Facts

Application

10/601,732Filed 24 Jun 2003

Priority

CN 01109026.X27 Feb 2001

Published

1 Apr 2004

Term ends

Not estimatedThe source records don’t support an estimate.

Classification9 codes

H04N 19/85
Methods or arrangements for coding, decoding, compressing or decompressing digital video signals: using pre-processing or post-processing…
H04N 19/124
Characterised by the element, parameter or selection affected or controlled by the adaptive coding: quantisation
H04N 19/132
Characterised by the element, parameter or selection affected or controlled by the adaptive coding: sampling, masking or truncation of coding…
H04N 19/136
Characterised by the element, parameter or criterion affecting or controlling the adaptive coding: incoming video signal characteristics or properties

Method for pre-suppressing noise of image

Life of this patent

Method for pre-suppressing noise of image

Life of this patent

Abstract

Claims8