Patent Document ID: 9165203
Application ID: 13975839
Patent Status: 1

Claim One:
1. A method for video signal processing comprising: identifying an overlay region of interest (ROI) in a frame of a video signal; identify at least one of contrast, brightness, hue, saturation and pixel density as a quality improvement factor for increasing quality of the ROI relative to a remaining portion of the frame of the video signal; and providing the quality improvement factor as metadata with the frame to a decoder to enable processing of the video signal containing the frame using the metadata, wherein identifying an overlay region comprises: defining, by the electronic device, first and second areas within an image of the frame of the video signal; calculating, by the electronic device, an alpha-blended value of a mean color value of the second area with an overlay color value; and if a mean color value of the first area is closer to the alpha-blended value than it is to the mean color value of the second area, then defining the overlay area comprising at least one pixel within the first area to be within the ROI, wherein calculating an alpha-blended value comprises applying an a priori alpha value and an a priori overlay color value, and wherein the step of calculating an alpha-blended value is performed according to the formula {circumflex over (P)}(i,j)=(1−α){circumflex over (P)} b (i,j)+αP l (i,j), wherein: {circumflex over (P)}(i,j) represents the calculated alpha-blended value {circumflex over (P)} b (i,j) represents the mean image color value of the second area, P l (i,j) represents the a-priori overlay color value, and α represents the a-priori alpha value, and wherein the step of identifying an overlay area is determined according to the formula C p =If (|{circumflex over (P)}(i,j)−P(i,j)|<|P(i,j)−{circumflex over (P)} b (i,j)|) wherein: P(i,j) represents the mean color value of the first area, {circumflex over (P)} b (i,j) represents the mean color value of the second area, {circumflex over (P)}(i,j) represents the predicted mean color value of the first area, and C p represents an overlay-blended graphic presence indicator.