We have developed a videophone system that works over mobile channels. The system uses multiple modulation schemes and uses packet dropping to reduce delay when the channel quality is poor. Here are some of the results obtained by the system in a simulated mobile radio environment.
Simulations have been done with both H.261 and H.263 video codecs. The H.261 simulations were done with a black and white video sequence, while a colour sequence was used for H.263.
Click on one of the images below to see the results for H.261 or H.263.
I have also done a comparison of the robust H.261 and H.263 video streams it terms of compression/bitrate and decoded image quality. Click here for the comparative study comparing my H.261 results with the H.263 results