應用於行動式視訊裝置之預設位元平面比對之嵌入式編解碼器

Abstract

對於移動視頻應用，所需的存儲量和幀存儲器的頻寬發揮關鍵作用。而縮減存取和幀存儲器的大小則可以減少面積，成本以及功率消耗。大多數的視頻壓縮指出較高的複雜性可達到更好的性能。然而，低複雜度演算法更容易被嵌入到H.264的解碼器。在此提出了一種新型嵌入式有損壓縮方案提出。它壓縮一個 4x2大小的區塊成為 32位元段。壓縮比（CR）是固定在2。在信號雜訊比損失 1.27〜3.94分貝。 所提出之管線架構所實現壓縮器和解壓器都分別為2個週期和1個週期。採用 90nm 標準CMOS製程，有效的成本解決方案,其所需之邏輯閘數量為4.9k，而其功率消耗為 244uW。

For mobile video applications, the required storage and bandwidth of frame memory play crucial roles. Reducing the accesses and the size of frame memory can decrease area, cost, as well as power consumption. Most of video compressions indicate that higher complexity can reach better performance. However, the lower complexity algorithm is easier to be embedded into H.264 decoder. In this paper, a novel embedded lossy compression scheme is proposed. It compresses a 4x2 size block into 32 bits segment. The compression ratio (CR) is fixed at 2. The PSNR loss is 1.89~3.45dB. A pipelined architecture has been proposed to realize both compressor and decompressor in 2 cycles and 1 cycle respectively. This cost-effective solution requires gate count of 4.9k and power consumption of 244uW in 90nm standard CMOS process.