A scheme of aerial-video codec was presented to realize two PAL videos simultaneously real time compression on the industrial embedded computer. The scheme chose discrete cosine transform (DCT) to decorrelate the image data. After comparison among many fast DCT algorithms

AAN’ approach was locked to be optimized and implemented

and the procedure of the optimization was presented. Scheme also improved the search method of variable-length code (VLC) table in variable-length encoding. Through the optimizations of DCT and the search method of VLC table

the two largest computational algorithm modules in our scheme

a 768x576 color video frame can be compressed in 8ms with P4 3.0G CPU. Under the compression ratio of 32:1

the PSNR of the scheme reached 30.18 which is extremely close to the performance of the algorithms based on wavelet

and it is the guarantee to the decoding quality of image. The experiment result shows our scheme fetch a better balance among compression speed

compression ratio and compression performance in video encoding

and testify it can be suitable for practical implementation in the aerial-video compression.