Digital signal processing apparatus and digital signal processing program

• US 20070036458A1
• Filed: 07/26/2006
• Published: 02/15/2007
• Est. Priority Date: 08/12/2005
• Status: Abandoned Application

• Current Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Original Assignee: Fuji Photo Film Co Limited (Fujifilm Holdings Corporation)
• Inventors: Sato, Hiroki
• Application Number:
  US11/492,799
• Publication Number:
  US 20070036458A1
• Time in Patent Office: Days
• US Class Current: 382/275
• CPC Class Codes: G06T 2207/20064 Wavelet transform [DWT]
• CPC Class Codes: G06T 5/10 using non-spatial domain filtering
• CPC Class Codes: G06T 5/70 Denoising; Smoothing

Abstract

A digital signal processing apparatus, comprises: a wavelet transforming device comprising an interleave transformer that divides and rearranges an input digital image signal by dividing the input digital image signal into a plurality of regions by down-sampling and a wavelet transformer that decomposes the rearranged digital Image signal Into a low-frequency sub band and a high-frequency sub band by wavelet transformation, wherein the interleave transformer further divides and rearranges the decomposed each of low-frequency sub band and the decomposed high-frequency sub band into a plurality of regions; and a coring device that executes a coring process to data of the high-frequency sub band. It is provided that a digital signal processing apparatus that can restrain generation of ringing and noise in a digital image signal.

Claims

1. A digital signal processing apparatus, comprising:

a wavelet transforming device comprising an interleave transformer that divides and rearranges an input digital image signal by dividing the input digital image signal into a plurality of regions by down-sampling and a wavelet transformer that decomposes the rearranged digital image signal into a low-frequency sub band and a high-frequency sub band by wavelet transformation, wherein the interleave transformer further divides and rearranges the decomposed each of low-frequency sub band and the decomposed high-frequency sub band into a plurality of regions; and

a coring device that executes a coring process to data of the high-frequency sub band.

2. A digital signal processing apparatus, comprising;

a sampling device that divides and rearranges an input digital image signal into a plurality of regions by down sampling at an arbitrary magnification;

a wavelet transforming device comprising a wavelet transformer that decomposes the rearranged digital image signal into a low-frequency sub band and a high-frequency sub band by wavelet transformation and an Interleave transformer that divides and rearranges the decomposed each of low-frequency sub band and the decomposed high-frequency sub band into a plurality of regions; and

a coring device that executes a coring process to data of the high-frequency sub band.

3. A digital signal processing program executed by a digital signal processing apparatus, comprising:

a wavelet transforming device comprising a wavelet transformer that decomposes a digital image signal into a low-frequency sub band and a high-frequency sub band by wavelet transformation and an interleave transformer that divides and rearranges data Into a plurality of regions; and

a coring device that executes a coring process to data of the high-frequency sub band, the program comprising;

(a) a first interleave instruction for dividing and rearranging an input digital image signal into a plurality of regions by down sampling;

(b) a wavelet transforming instruction for decomposing the rearranged digital image signal into a low-frequency sub band and a high-frequency sub band by wavelet transformation;

(c) a second interleave instruction for dividing rearranging the decomposed each of low-frequency sub band and the decomposed high-frequency sub band into a plurality of regions; and

(d) a coring instruction for executing a coring process to data of the high-frequency sub band.