COMPONENT EXTRACTION/CORRECTION DEVICE, COMPONENT EXTRACTION/CORRECTION METHOD, STORAGE MEDIUM AND ELECTRONIC EQUIPMENT

• US 20100027885A1
• Filed: 07/28/2009
• Published: 02/04/2010
• Est. Priority Date: 07/30/2008
• Status: Active Grant

• Current Assignee: Kanazawa University, Olympus Corporation
• Original Assignee: Kanazawa University, Olympus Corporation
• Inventors: Saito, Takahiro, ARAGAKI, Hideya
• Granted Patent: US 8,396,291 B2
• Time in Patent Office: Days
• US Class Current: 382/167
• CPC Class Codes: G06T 2207/10024 Color image
• CPC Class Codes: G06T 2207/20016 Hierarchical, coarse-to-fine, multiscale or multiresolution image processing; Pyramid transform
• CPC Class Codes: G06T 5/70 Denoising; Smoothing

Abstract

Provided is a component extraction/correction device, comprising: a decomposition unit that decomposes an original image signal into a plurality of frequency bands to generate a plurality of band signals; an extraction unit that extracts a skeleton component from among a plurality of components constituting the band signal; a first correction unit that corrects the extracted skeleton component by using the band signal and one component other than the skeleton component among the plurality of components; and a second correction unit that corrects the one component by using the corrected skeleton component and the band signal.

Claims

1. A component extraction/correction device, comprising:

a decomposition unit that decomposes an original image signal into a plurality of frequency bands to generate a plurality of band signals;

an extraction unit that extracts a skeleton component representing a global structure of the band signal from among a plurality of components constituting the band signal;

a first correction unit that performs a first correction processing to correct the extracted skeleton component by using the band signal and one component other than the skeleton component among the plurality of components; and

a second correction unit that performs a second correction processing to correct the one component by using the corrected skeleton component and the band signal.

2. The component extraction/correction device according to claim 1, wherein the one component comprises a component representing a local structure of the band signal.

3. The component extraction/correction device according to claim 1, wherein the first correction unit performs the first correction processing by using a first difference value obtained by subtracting the one component from the band signal.

4. The component extraction/correction device according to claim 1, wherein the second correction unit performs the second correction processing by using a second difference value obtained by subtracting the corrected skeleton component from the band signal.

5. The component extraction/correction device according to claim 4, wherein the second correction unit calculates an index value obtained by comparing the second difference value with a predetermined threshold value, and sets a third difference value obtained by subtracting the index value from the second difference value, as the corrected one component.

6. The component extraction/correction device according to claim 1, wherein:

the decomposition unit generates the plurality of band signals for each color;

the extraction unit extracts the skeleton component for each color by using the band signal generated for each color;

the first correction unit corrects the extracted skeleton component as the first correction processing by using the band signal generated for each color, and

the second correction unit corrects the one component for each color as the second correction processing by using the corrected skeleton component.

7. The component extraction/correction device according to claim 1, further comprising a control unit that controls repetition of operations for the first correction processing performed by the first correction unit and the second correction processing performed by the second correction unit,

wherein the first correction unit performs, when the first correction processing is repeated by the control unit, the first correction processing by using the corrected one component obtained by the second correction processing.

8. The component extraction/correction device according to claim 1, wherein:

the extraction unit extracts the skeleton component representing the global structure for each band signal;

the first correction unit corrects for each band signal the skeleton component extracted for each band signal; and

the component extraction/correction device further comprises a synthesis unit that synthesizes the skeleton component corrected for each band signal across the plurality of frequency bands to thereby generate the skeleton component representing the global structure of the original image signal constituted by the plurality of band signals.

9. The component extraction/correction device according to claim 1, wherein:

the extraction unit extracts the skeleton component representing the global structure for each band signal;

the first correction unit corrects for each band signal the skeleton component extracted for each band signal;

the second correction unit corrects the one component for each band signal by using the skeleton component corrected for each band signal; and

the component extraction/correction device further comprises a synthesis unit that synthesizes the one component corrected for each band signal across the plurality of frequency bands to thereby generate a component representing a local structure of the original image signal constituted by the plurality of band signals.

10. The component extraction/correction device according to claim 1, further comprising:

a first storage unit that stores the skeleton component corrected by the first correction unit;

a second storage unit that stores the one component corrected by the second correction unit; and

an initialization unit that sets, before the first correction processing at a first time, the skeleton component stored by the first storage unit to zero while setting the one component stored by the second storage unit to the band signal.

11. The component extraction/correction device according to claim 1, wherein the first correction unit is configured to:

set a plurality of coring ranges for a first difference value obtained by subtracting the one component from the band signal; and

set a result of performing a coring processing on the first difference value based on the plurality of coring ranges, as the corrected skeleton component.

12. The component extraction/correction device according to claim 11, wherein the first correction unit is configured to:

transform, if the first difference value belongs to any one of the plurality of coring ranges, the first difference value into a fixed value corresponding to the coring range concerned; and

transform, if the first difference value belongs to none of the plurality of coring ranges, the first difference value based on a transform function.

13. The component extraction/correction device according to claim 1, wherein the second correction unit is configured to:

set a single coring range for a second difference value obtained by subtracting the corrected skeleton component from the band signal; and

correct the one component according to a result of performing a coring processing on the second difference value based on the single coring range.

14. The component extraction/correction device according to claim 13, wherein the second correction unit is configured to:

transform, if the second difference value belongs to the single coring range, the second difference value into a predetermined fixed value; and

transform, if the second difference value does not belong to the single coring range, the second difference value based on a transform function.

15. The component extraction/correction device according to claim 1, wherein the decomposition unit decomposes the original image signal into the plurality of frequency bands by a wavelet transform.

16. The component extraction/correction device according to claim 1, wherein the first correction unit corrects the skeleton component to thereby cause the corrected skeleton component to include a flat component and an edge component.

23. An electronic equipment, comprising the component extraction/correction device according to claim 1.

17. A component extraction/correction device, comprising:

an extraction unit that extracts a skeleton component representing a global structure of an original image signal;

a decomposition unit that decomposes the extracted skeleton component into a plurality of frequency bands to generate the skeleton component for each of a plurality of band signals;

a first correction unit that performs a first correction processing to correct the skeleton component for each band signal;

a synthesis unit that synthesizes the skeleton component corrected for each band signal across the plurality of frequency bands to thereby generate the skeleton component of the original image signal constituted by the plurality of band signals; and

a second correction unit that performs a second correction processing to correct one component other than the skeleton component of the original image signal by using the original image signal and the skeleton component of the original image signal.

18. The component extraction/correction device according to claim 17, further comprising:

a control unit that controls repetition of operations for an extraction processing performed by the extraction unit, a decomposition processing performed by the decomposition unit, the first correction processing performed by the first correction unit, a synthesis processing performed by the synthesis unit, and the second correction processing performed by the second correction unit,

wherein the extraction unit performs, if the extraction processing performed by the extraction unit is repeated by the control unit, the extraction processing by using the one component obtained by the second correction unit and the original image signal.

19. The component extraction/correction device according to claim 17, wherein the extraction unit extracts the skeleton component of the original image signal by using a difference value obtained by subtracting the one component from the original image signal.

20. The component extraction/correction device according to claim 17, wherein the one component comprises a component representing a local structure of the original image signal.

21. The component extraction/correction device according to claim 17, wherein the decomposition unit decomposes the original image signal into the plurality of frequency bands by a wavelet transform.

22. The component extraction/correction device according to claim 17, wherein the first correction unit corrects the skeleton component to thereby cause the corrected skeleton component to include a flat component and an edge component.

24. An electronic equipment, comprising the component extraction/correction device according to claim 17.

25. A component extraction/correction method, comprising:

a decomposition step of decomposing an original image signal into a plurality of frequency bands to generate a plurality of band signals;

an extraction step of extracting a skeleton component representing a global structure of the band signal from among a plurality of components constituting the band signal;

a first correction step of performing a first correction processing to correct the extracted skeleton component by using the band signal and one component other than the skeleton component among the plurality of components; and

a second correction step of performing a second correction processing to correct the one component by using the corrected skeleton component and the band signal.

26. A computer-readable storage medium storing a program that is executed by a computer, the program comprising:

a decomposition step of decomposing an original image signal into a plurality of frequency bands to generate a plurality of band signals;

an extraction step of extracting a skeleton component representing a global structure of the band signal from among a plurality of components constituting the band signal;

a first correction step of performing a first correction processing to correct the extracted skeleton component by using the band signal and one component other than the skeleton component among the plurality of components; and

a second correction step of performing a second correction processing to correct the one component by using the corrected skeleton component and the band signal.

27. A component extraction/correction method, comprising:

an extraction step of extracting a skeleton component representing a global structure of an original image signal;

a decomposition step of decomposing the extracted skeleton component into a plurality of frequency bands to generate the skeleton component for each of a plurality of band signals;

a first correction step of performing a first correction processing to correct the skeleton component for each band signal;

a synthesis step of synthesizing the skeleton component corrected for each band signal across the plurality of frequency bands to thereby generate the skeleton component of the original image signal constituted by the plurality of band signals; and

a second correction step of performing a second correction processing to correct one component other than the skeleton component of the original image signal by using the original image signal and the skeleton component of the original image signal.

28. A computer-readable storage medium storing a program that is executed by a computer, the program comprising:

an extraction step of extracting a skeleton component representing a global structure of an original image signal;

a decomposition step of decomposing the extracted skeleton component into a plurality of frequency bands to generate the skeleton component for each of a plurality of band signals;

a first correction step of performing a first correction processing to correct the skeleton component for each band signal;

a synthesis step of synthesizing the skeleton component corrected for each band signal across the plurality of frequency bands to thereby generate the skeleton component of the original image signal constituted by the plurality of band signals; and

a second correction step of performing a second correction processing to correct one component other than the skeleton component of the original image signal by using the original image signal and the skeleton component of the original image signal.