Local cosine transform — a method for the reduction of the blocking effect in JPEG

@article{Aharoni1993LocalCT,
  title={Local cosine transform — a method for the reduction of the blocking effect in JPEG},
  author={Gil Aharoni and Amir Averbuch and Ronald R. Coifman and Moshe Israeli},
  journal={Journal of Mathematical Imaging and Vision},
  year={1993},
  volume={3},
  pages={7-38}
}
This paper presents the local cosine transform (LCT) as a new method for the reduction and smoothing of the blocking effect that appears at low bit rates in image coding algorithms based on the discrete cosine transform (DCT). In particular, the blocking effect appears in the JPEG baseline sequential algorithm. Two types of LCT were developed: LCT-IV is based on the DCT type IV, and LCT-II is based on DCT type II, which is known as the standard DCT. At the encoder side the image is first… CONTINUE READING