Color highlight reconstruction

摘要

Methods and apparatus may be applied to reconstruct pixel values in saturated regions of an image. Saturated regions are identified and hues for pixels in the saturated regions are estimated based on hues in boundaries of the saturated regions. Gradients for pixel values in saturated color channels within the saturated region may be estimated based on known gradients for non-saturated color channels. Reconstructed pixel values may be derived from the estimated gradients. The methods and apparatus may be applied in conjunction with dynamic range expansion.

主权项

1. A method for processing image data comprising pixel values for pixels defining an image, the method comprising:
obtaining estimated hues for a plurality of the pixels in a saturated region within the image; and, based at least in part on the estimated hues, generating reconstructed pixel values to replace saturated pixel values for the plurality of pixels in the saturated region; wherein obtaining estimated hues comprises in-painting hues from a boundary of the saturated region; and, applying a 1-dimensional spatial filter along the boundary prior to in-painting the hues; wherein the 1-dimensional spatial filter weights contributions of pixels along the boundary according to proximity to a current pixel; and, wherein the 1-dimensional spatial filter weights contributions of pixels along the boundary such that for a current pixel having small pixel values, the proximity of other pixels along the boundary has less effect on the weighting of the other pixels as compared to the effect on the weighting of the other pixels for a current pixel having large pixel values.