Patent ID: 6075768
Filing Date: 2000-06-13
Classification: H04L

Abstract:
In a packet data network an apparatus for adjusting video image quality comprising:network load detection means for detecting a network load, said network load having an uncongested state, a loaded state, and a congested state;video encoding control circuit adjusting a video quality to a target video quality, said target video quality increasing when said network load is in said uncongested state and said target video quality decreasing when said network load is in said congested state, wherein said video quality is a peak mean squared error between an uncompressed image and a corresponding decoded image; anda circuit for computing said target video quality when said network load is in said uncongested state in response to a first control equation, said first control equation isE.sub.target =E.sub.current -.gamma..sub.1 .multidot.(E.sub.current -E.sub.min)where E.sub.target is said target video quality, is a peak mean squared error measure of video quality of a current frame, .gamma..sub.1 is a first predetermined constant, and E.sub.min is a predetermined minimum peak mean squared error.