Detection and/or correction of suppressed signal defects in moving images
AssigneeWarner Bros. Entertainment Inc.
InventorDaniel Scott Rosen
Life of this patent
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Abstract
Techniques are described for detecting a vertical line artifact in an image captured with a digital camera. The vertical line artifact may be caused by a defect in the digital camera. Techniques also are described for correcting a vertical line artifact in an image captured with a digital camera. It may be determined that the vertical line artifact includes at least one pixel in the vertical line having a non-zero suppressed signal. A value for the pixel having the non-zero suppressed signal may be determined. A statistically-based correction may be applied to the pixel having the non-zero suppressed signal based on the determination that the pixel has a non-zero suppressed signal and the determined value of the pixel. The image may be a portion of a movie stored on a DVD.
Claims20
A method for detecting a vertical line artifact in a column of pixels, the method comprising:
- accessing image data captured from a single digital camera, the image data including multiple columns of pixels with each column of pixels having data for multiple, different color channels;
- identifying a non-defective column of pixels included in the image data captured from the single digital camera;
- determining a true mean and a true standard deviation for the non-defective column of pixels included in the image data captured from the single digital camera;
- determining a mean and a column number for other columns of pixels that are included in the multiple columns of pixels and that are different from the identified non-defective column of pixels;
- computing, for each of the other columns of pixels, a score based on the mean and column number determined for the other columns of pixels and the true mean and true standard deviation determined for the non-defective column of pixels;
- comparing the computed scores to a threshold value;
- based on the comparison, determining whether a vertical line artifact having a non-zero suppressed signal exists at each of the other columns of pixels;
- and
- conditioned on a determination that a vertical line artifact exists at a defective column of pixels included in the other columns of pixels, identifying a location of the defective column of pixels and storing, in electronic storage, the identified location of the defective column of pixels.
A post-production processing system comprising:
- a processor;
- and
- a non-transitory computer-readable storage medium encoded with executable instructions that, when executed by the processor, causes the processor to perform operations comprising:
- accessing image data captured from a single digital camera, the image data including multiple columns of pixels with each column of pixels having data for multiple, different color channels;
- identifying a non-defective column of pixels included in the image data captured from the single digital camera;
- determining a true mean and a true standard deviation for the non-defective column of pixels included in the image data captured from the single digital camera;
- determining a mean and a column number for other columns of pixels that are included in the multiple columns of pixels and that are different from the identified non-defective column of pixels;
- computing, for each of the other columns of pixels, a score based on the mean and column number determined for the other columns of pixels and the true mean and true standard deviation determined for the non-defective column of pixels;
- comparing the computed scores to a threshold value;
- based on the comparison, determining whether a vertical line artifact having a non-zero suppressed signal exists at each of the other columns of pixels;
- and
- conditioned on a determination that a vertical line artifact exists at a defective column of pixels included in the other columns of pixels, identifying a location of the defective column of pixels and storing, in electronic storage, the identified location of the defective column of pixels.
Dependencies are inferred from the claim text.