System and method for scalar quantization error reduction

摘要

To reduce artifacts caused by quantization errors in image compression systems, an offset is added to quantized samples at low frequency sections of a macroblock. A decoder uses the offset after decoding to bring the decoded sample closer to the original pre-encoded and pre-quantized sample, thereby compensating for quantization errors.

主权项

1. An encoder, comprising:
a quantization logic configured to quantize a sample; an inverse quantization logic, communicatively coupled to the quantization logic, configured to inverse quantization of the quantized sample; an offset calculation logic, communicatively coupled to the inverse quantization logic, configured to
receive the inverse quantized sample and neighboring inverse quantized samples; andgenerate, in a macroblock, an offset for the inverse quantized sample if at least one of the neighboring inverse quantized samples have a substantially same value as the inverse quantized sample; and a packet builder, communicatively coupled to the offset calculation logic, configured to build a packet using the quantized sample and the generated offset.