一種彩色視頻圖像序列的三維小波變換編碼方法
AN ALGORITRHM FOR CODING COLOR VIDEO SIGNAL USING 3D-WAVELET TRANSFORMATION
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摘要: 該文給出了一種基于三維小波變換的彩色視頻圖像序列的編碼方法。先將彩色視頻圖像序列的RGB(紅綠藍)色彩表示轉(zhuǎn)換成YCbCr(亮度色度色度)表示,再將表示幀序的t坐標代換成z坐標,可將其看成是三維空間中的體。將其分成子塊后,仿照二維圖像小波變換的方法,對每個亮度色度分量做三維小波變換。變換后的各亮度色度分量的能量主要集中于低頻波段,這些波段對該視頻圖像序列的視覺效果影響最大。將不同分量的各個不同波段按不同的精度量化并進行熵編碼,可以達到去除幀內(nèi)和幀間冗余,壓縮數(shù)據(jù)的目的。試驗表明,使用本方法可以達到較好的壓縮效果。此方法較直觀,速度也比較快。
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關鍵詞:
- 小波; 三維小波變換; 彩色視頻圖像編碼
Abstract: This paper presents an algorithm for coding color video signal using 3D-wavelet transformation. When the 3 color channels of RGB of the video signal are converted to color channels of YCbCr, and the frame order t of the signal is replaced by order z, this signal can be considered as 3 blocks in a 3D-space. Each block presents a color channel. After splitting each block into smaller sub-blocks, imitate the method of 2D-wavelet transformation for image, the sub-blocks can be transformed with 3D-wavelet. Most of energy of each color channel is in the transformed low-frequency bands. These bands affect the visual quality of the video signal most. After quantizing different bands with different precision and entropy coding each band, the intra- and inter-frame redundancy of the color video signal can be eliminated and the data can be compressed. Our simulation experiments show that this algorithm can obtain very good results. -
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