General image enhancement framework

• US 6,108,453 A
• Filed: 09/16/1998
• Issued: 08/22/2000
• Est. Priority Date: 09/16/1998
• Status: Expired due to Term

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Acharya, Tinku
• Primary Examiner(s): Rogers, Scott
• Application Number:
  US09/154,176
• Time in Patent Office: 706 Days
• Field of Search: 382/254, 382/260, 382/263, 382/264, 382/266, 382/269, 382/275, 382/300, 358/447, 358/463, 358/525, 358/530, 358/532, 345/136, 345/137
• US Class Current: 382/254
• CPC Class Codes: G06T 2207/20192 Edge enhancement; Edge preservation
• CPC Class Codes: G06T 5/20 using local operators
• CPC Class Codes: G06T 5/70 Denoising; Smoothing
• CPC Class Codes: G06T 5/73 Deblurring; Sharpening

Abstract

A method comprising forming an approximated image from an original input image, forming a pre-enhancement map by differentiating the approximated image from the input image, enhancing the pre-enhancement map according to an image enhancement technique forming an enhanced map thereby, and combining the enhanced map with the approximated image to generate an enhanced image.

Claims

1. A method comprising:

forming an approximated image from an original input image;

forming a pre-enhancement map by differentiating said approximated image from said input image;

enhancing said pre -enhancement map according to an image enhancement technique forming an enhanced map thereby; and

combining said enhanced map with said approximated image to generate an enhanced image.

2. The method according to claim 1, wherein forming said approximated image comprises low pass filtering said input image.

3. The method according to claim 1, wherein forming said approximated image comprises averaging portions of said input image in a moving window manner.

4. The method according to claim 1, wherein forming said pre-enhancement map comprises subtracting said approximated image from said input image.

5. The method according to claim 1, wherein combining comprises adding said enhanced map with said approximated image.

6. A method according to claim 1, wherein said enhancing includes noise removal.

7. A method according to claim 1, wherein said enhancing includes edge sharpening.

10. The system according to claim 1, wherein said approximator is configured to apply a moving windowed average on said input image.

8. A system comprising:

an approximator configured to generate an approximated image of an input image;

a differential mapping module coupled to said approximator, said differential mapping module configured to generate a pre-enhancement map from said input image and said approximated image;

an enhancement module coupled to said differential mapping module, configured to enhance said pre-enhancement map and form an enhancement map therefrom; and

a constructor coupled to said enhancement module, configured to combine said enhanced module map and said approximated image outputting an enhanced version of said input image therefrom.

9. The system according to claim 8, wherein said approximator is a low pass filtering.

11. The system according to claim 8, wherein said differential mapping module is a subtractor.

12. The system according to claim 8, wherein said constructor is an adder.

13. A system according to claim 8 incorporates wherein said enhancement module provides noise removal.

14. An article comprising:

a computer readable medium having instructions stored thereon which, when executed by a processor, cause;

generating an approximated image from an input image;

generating a pre-enhancement map by differentiating said approximated image from said input image;

enhancing said pre-enhancement map to form an enhanced map; and

combining said enhanced map with said approximated image to form an enhanced image.