在新的H.264壓縮標準,運用了更複雜且精確的編碼方式,使得在編碼估測方面更佳的精準,提供比H.263更低的位元率和更好的視訊品質,雖然有較好的效能,但編碼速度過慢為其一大缺點。在本論文中,我們針對H.264的Intra預測模式的部份,提出了兩種快速且有效率的Intra模式預測方法,其主要目的是要利用較簡易的方式來獲得預測區塊的模式,而模擬結果得到在客觀性PSNR效果近似的條件下,可大幅降低其運算量,相對的時間上分別節省了45%~55%以及60%~70%。此外,我們將提出的方法應用於車牌定位系統上,在運算量大幅降低之下,雖然失真相對提高,但在定位的處理上依然可以順利的定位出車牌的位置,模擬結果也證明提出的方法應用於車牌定位上的可行性。
The new video coding standard, H.264/AVC, use more complicated and accurate code way, make it is better in the coding estimation, and provides lower bit rate and better video quality than H.263, though it can achieve higher efficiency, but coded speed is too slow. This thesis proposed two fast and efficient Intra mode prediction algorithm, main purpose uses more easy way to get the prediction mode, and the simulation result can reduce its operation amount under the objectivity PSNR with approximate result, and the time-saved percentage can achieve about 45%~50% and 60%~70%. In addition, we exploit our method to apply the navigation system of the number plate, under the operation amount is reduced by a wide margin, though distortion increased, but still can orient position of number plate successfully, and simulation result proves the method is feasible.
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