Method and system for altering defects in a digital image

• US 6,650,789 B2
• Filed: 01/18/2002
• Issued: 11/18/2003
• Est. Priority Date: 09/16/1999
• Status: Expired due to Term

• Current Assignee: Kodak Alaris Inc (KPP (no. 2) Trustees Ltd.)
• Original Assignee: Eastman Kodak Company
• Inventors: Edgar, Albert D., Lee, Raymond S.
• Primary Examiner(s): ROGERS, SCOTT A
• Application Number:
  US10/052,600
• Publication Number:
  US 20020106133A1
• Time in Patent Office: 669 Days
• Field of Search: 382/275, 382/260, 382/261, 382/262, 382/264, 356/237.1, 356/239.1, 356/239.7, 356/239.8, 356/237.2, 356/237.3, 250/341.8, 250/339.11
• US Class Current: 382/260
• CPC Class Codes: H04N 1/4097 Removing errors due external factors, e.g. dust, scratches
• CPC Class Codes: H04N 1/58 Edge or detail enhancement; Noise or error suppression, e.g. colour misregistration correction H04N1/62 takes precedence

Abstract

One aspect of the invention is a method for altering defects in a digital image. At least a first pixel of a first channel of a digital image is filtered using digital circuitry to produce a filtered pixel by averaging the intensity of the first pixel and a plurality of additional pixels in the neighborhood of the first pixel. At least one of the pixels is weighted in response to the intensity value of at least one pixel in a defect channel associated with the digital image. A corrected digital image is produced using the digital circuitry in response to the filtered pixel and the first channel of the digital image.

Claims

1. A film processing system comprising:

a scanning system operable to scan developed film;

at least one digital image, wherein the at least one digital image comprises at least one channel having a plurality of image pixels associated with image frequency bands;

a defect map associated with the at least one digital image, wherein the defect map comprises at least one channel having one or more defect pixels associated with defect frequency bands; and

a computer software program associated with the scanning system operable to produce a corrected digital image comprising image pixels and corrected image pixels, wherein each corrected image pixel is associated with a corresponding defect pixel and the corrected image pixel is calculated using the image pixels neighboring the corresponding defect pixel.

2. The film processing system of claim 1, wherein the corrected image pixel is calculated by weighting the image pixels neighboring the corresponding defect pixel.

3. The film processing system of claim 2, wherein weighting the image pixels neighboring the corresponding defect pixel is based on a spatial distance separating the image pixel from the corresponding defect pixel.

4. The film processing system of claim 2, wherein weighting the image pixels neighboring the corresponding defect pixel is based, in part, on the defect pixels associated with the image pixels neighboring the corresponding defect pixel.

5. The film processing system of claim 1, wherein the corrected image pixel is calculated by averaging the image pixels neighboring the corresponding defect pixel.

6. The film processing system of claim 5, wherein the corrected image pixel is calculated by averaging the image pixel to be corrected with the image pixels neighboring the corresponding defect pixel.

7. The film processing system of claim 1, wherein the image pixels neighboring the corresponding defect pixel that also have corresponding defect pixels are not used to calculate the corrected image pixel.

8. The film processing system of claim 1, wherein each defect pixel has an associated intensity value and each corrected image pixel is calculated, in part, on the defect pixel intensity value.

9. The film processing system of claim 1, wherein the defect map is determined by scanning the film using infrared light.

10. The film processing system of claim 9, wherein a threshold defect value is used to calculate the defect map.

11. A method for producing a corrected digital image comprising:

scanning developed film to produce at least one digital image and a defect map corresponding to each digital image, wherein the at least one digital image comprises at least one channel having a plurality of image pixels associated with image frequency bands and the defect map comprises at least one channel having one or more defect pixels associated with defect frequency bands;

calculating a corrected image pixel from each corresponding defect pixel, wherein each corrected image pixel is calculated using the image pixels neighboring the corresponding defect pixel; and

producing a corrected digital image using the corrected image pixels.

12. The method of claim 11, wherein the corrected image pixel is calculated by weighting the image pixels neighboring the corresponding defect pixel.

13. The method of claim 12, wherein weighting the image pixels neighboring the corresponding defect pixel is based on a spatial distance separating the image pixel from the corresponding defect pixel.

14. The method of claim 12, wherein weighting the image pixels neighboring the corresponding defect pixel is based, in part, on the defect pixels associated with the image pixels neighboring the corresponding defect pixel.

15. The method of claim 11, wherein each corrected image pixel is calculated by averaging the image pixels neighboring the corresponding defect pixel.

16. The method of claim 15, wherein the corrected image pixel is calculated by averaging the image pixel to be corrected with the image pixels neighboring the corresponding defect pixel.

17. The method of claim 11, wherein each defect pixel has an associated intensity value and each corrected image pixel is calculated, in part, on the defect pixel intensity value.

18. A film processing system comprising:

a scanning system operable to scan developed film and produce at least one digital image and a defect map, wherein the at least one digital image comprises at least one channel having a plurality of image pixels and the defect map comprises at least one channel having one or more defect pixels; and

a computer software program associated with the scanning system operable to produce a corrected digital image comprising image pixels and corrected image pixels, wherein each corrected image pixel is associated with a corresponding defect pixel and the corrected image pixel is calculated using the image pixels neighboring the corresponding defect pixel, wherein the image pixels neighboring the corresponding defect pixel that also have corresponding defect pixels are not used to calculate the corrected image pixel.