Rate-Distortion optimization

Rate-Distortion optimization - how it works

Calculating the bit cost is made more difficult by the entropy encoders in modern video codecs, requiring the rate-distortion optimization algorithm to pass each block of video to be tested to the entropy coder to measure its actual bit cost. In MPEG codecs, the full process consists of a discrete cosine transform, followed by quantization and entropy encoding. Because of this, rate-distortion optimization is much slower than most other block-matching metrics, such as the simple sum of absolute differences (SAD) and sum of absolute transformed differences (SATD). As such it is usually used only for the final steps of the motion estimation process, such as deciding between different partition types in H.264/AVC.

대충 해석하자면
이미지를 압축 하는 과정에서 마지막 과정인 엔트로피 코딩시
이것을 다른 네트워크상대의 컴퓨터나 파일로 저장할때 비트수까지 카운트 해서
적은 량의 비트로 보내겠다는 소리 같은데....

오래전에?? 배워서 기억이 가물가물하고.. 영어 해석도 귀찮쿠...
- 출처: wikipedia.org -