Video Quantizer Unit and Method Thereof

Abstract

A quantizer and method are disclosed.

1 - 10 . (canceled) 
     
     
         11 . A quantization system comprising:
 a receiver configured to receive a first compressed bit stream having a first quantization level and a first motion vector, wherein the first motion vector is extracted from the first compressed bit stream;   an inverse quantizer configured to perform an inverse quantization of the first compressed bit stream at the first quantization level to generate a first set of coefficients;   an inverse transformer configured to apply an inverse transform to the first set of coefficients to generate a frame of pixel data;   a motion compensator configured to apply motion compensation using the frame of pixel data to generate motion compensated pixel data using a prior frame of pixel data stored in a frame buffer receiving the first motion vector extracted from the first compressed bit stream;   a transformer configured to generate a second set of coefficients based on the motion compensated pixel data; and   a quantizer configured to quantize the second set of coefficients from the motion compensated pixel data at a second quantization level to generate a second compressed bit stream having the second quantization level.   
     
     
         12 . The quantization system of  claim 11  further comprising a variable length decoder configured to decode a variable length code first compressed bit stream to generate the first set of quantized coefficients that are input to the inverse quantizer. 
     
     
         13 . The quantization system of  claim 11  further comprising a variable length coder configured to encode variable length coding of the second compressed bit stream. 
     
     
         14 . The quantization system of  claim 11 , wherein the first and second sets of coefficients further comprise discrete cosine coefficients. 
     
     
         15 . A method comprising:
 receiving a first compressed bit stream having a first quantization level and a first motion vector;   extracting the first motion vector from the first compressed bit stream;   applying an inverse quantization, using an inverse quantizer, to the first compressed bit stream at the first quantization level to generate a first set of coefficients;   applying an inverse transformation, using an inverse transformer, to the first set of coefficients to generate a frame of pixel data;   performing a motion compensation using the frame of pixel data to generate motion compensated pixel data using a prior frame of pixel data stored in a frame buffer receiving the first motion vector extracted from the first compressed bit stream;   applying a transformation to generate a second set of coefficients based on the motion compensated pixel data; and   quantizing the second set of coefficients from the motion compensated pixel data at a second quantization level to generate a second compressed bit stream having the second quantization level.   
     
     
         16 . The method of  claim 15  further comprising decoding a variable length code to generate the first set of quantized coefficients. 
     
     
         17 . The method of  claim 15  further comprising variable length coding of the second set of coefficients at the second quantization level to generate the second compressed bit stream. 
     
     
         18 . The method of  claim 15 , wherein the first and second sets of coefficients further comprise discrete cosine coefficients.