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System and method for sharpening image data

  • US 8,294,781 B2
  • Filed: 10/20/2009
  • Issued: 10/23/2012
  • Est. Priority Date: 10/20/2009
  • Status: Active Grant
First Claim
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1. A method for processing an image, comprising:

  • using an image processor;

    obtaining a luma image based upon image data acquired using an image sensor;

    for each luma pixel of the luma image, applying a multi-scale unsharp mask filter to a current luma pixel to determine one or more unsharp values, wherein each of the one or more unsharp values is associated with a respective gain and a respective threshold;

    determining a base value, wherein the base value is selected as either a value of the current luma pixel or as a value of an output of the multi-scale unsharp mask filter based at least partially upon a noise variance of the image data;

    comparing each of the one or more unsharp values to the respective threshold;

    for each of the one or more unsharp values that is greater than the respective threshold, applying the respective gain to determine corresponding gained unsharp values; and

    adding each gained unsharp value to the base value to produce a sharpened pixel corresponding to the current luma pixel.

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