Transform Domain Distributed Video Coding

Outline  Another Approach  Side Information  Motion Compensation

Another Approach  8X8 DCT  Divided into low frequency & high frequency  Low frequency - Wyner-Ziv Coding  High frequency - run-length & Huffman

High Frequency  Store quantized high frequency coefficient of previous frame  Calculate distance between previous frame and current frame  If the distance smaller than a threshold, send “no high frequency bits”  If the distance exceeds the threshold, compress coefficient using run-length and Huffman

Side information  Interpolation  Extrapolation  Motion estimation  Pixel value

Side Information

Motion Compensation  Motion-compensated interpolation (MC-I) using the decoded Key frame at time t-1 & t+1

Motion Compensation

 Motion-compensated extrapolation (MC-E) estimate the motion between the Wyner-ziv frame at time t-2 and the Key frame at time t-1

Low complexity Motion Compensation  Average interpolation (Avg-I) side information generate by averaging the pixel value from the key frames at t-1 & t+1  Previous Frame Extrapolation (Prev-E) previous key frame is used directly as side information