Patent ID: 8331451
Filing Date: 2012-12-11
Classification: H04N

Abstract:
1. An apparatus to enhance resolution of video image, the apparatus comprising: a frame extraction unit to extract a key frame and one or more neighboring frames of the key frame from a video sequence; an upsampling unit to upsample the key frame and the neighboring frames; a motion-vector search unit to calculate a motion vector of the upsampled key frame using the upsampled neighboring frames as reference frames; and a key-frame estimation unit to enhance quality of the upsampled key frame using temporal information obtained from the motion vector and spatial information in the key frame, wherein the key-frame estimation unit comprises: a prior-image modeling unit to model a prior image model based on the key frame by calculating a plurality of spatial activities of the upsampled key frame and calculating at least one temporal activity of the upsampled key frame based on a motion vector between a previous frame and the key frame, and a motion vector between a next frame and the key frame; a conditional-density modeling unit to model a conditional density based on the key frame; and an optimal-solution calculation unit to calculate an optimally upsampled key frame using the modeled prior image and the modeled conditional density.