Applying the combined SPIHT-DCT method using spatial and spatial-temporal scaling to encode video images
Subject Areas :vahid Seirafian 1 , siamak talebi 2
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Keywords:
Abstract :
In this paper, a hybrid encoder using two features of spatial scalability and spatio-temporal scalability is presented for high resolution video coding. In the combined method, Intra and Inter video frames are coded in two different ways. Intra frames are coded using SPIHT1 algorithm which is based on wavelet transform. Inter frames are coded in the usual MPEG-2 standard way and based on DCT conversion. By coding the video with a high degree of resolution in two ways: spatial scalability and spatial-temporal scalability, the video is sent through two or three layers. The data sent from the layers provide a video with different resolution and quality to the user. In this way, the user can choose the right service based on his needs. In spatial scalability, the base layer and the upgrade layer have the same coding structure. But in the spatio-temporal scalability of the second upgrade layer, because it only includes Inter frames, it is only coded based on the standard method. The results of the simulations performed on different videos with a high degree of resolution show the improvement of the final image quality in the proposed hybrid method with scalability in different layers, compared to the method based on the MPEG-2 standard.
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