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Wyner-Ziv Coding of Still Images with Rate Estimation at the Encoder

We develop a Wyner-Ziv still image codec with decoder feedback, based on a Rate Compatible Punctured Turbo (RCPT) code. Within this framework, two methods of pairing source data with side information are compared and found to be similar in performance. The architecture is modified into a Wyner-Ziv image codec with rate estimation at the encoder. The proposed rate estimator is the mean of the turbo decoder’s correct channel probability estimates of systematic bits. The codec in conjunction with this rate estimator suffers only a rate of loss 0.1 bits per pixel for certain images. However, for images with a prevalence of distinct edges the rate-estimated Wyner-Ziv image codec does not achieve the performance of the Wyner-Ziv image codec with decoder feedback.