Impact of Codec Schemes on MultimediaCommunication
نویسندگان
چکیده
Diierent coding/decoding schemes for video frames require diierent amount of CPU processing overheads, and result in diierent amount of frame data compression. In this paper, we study the performance of alternative codec schemes as supported in a video conferencing software called NV. We present the concept of momentum which is the number of blocks in video frame whose contents have been changed since the display of the last video frame. As many codec schemes use only diierentials (i.e. the diierence between the current video frame and the last video frame coded) for coding a frame, momentum aaects the performance of codec schemes signiicantly as veriied by our experiments. Lossy compression of images results in lower quality, smaller size of images. Some of the information in the image is lost but because of the smaller size there is a decrease of communication delay in retrieving that image. We measure the compression time and the amount of compression and demonstrate that not all images achieve a uniform compression ratio. Higher the compression ratio, more the decrease in communication delay.
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