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The Effect of Dither on Luminance Quantization of Pictures
This work analyzes the operation of a dithered quantizer of picture luminance. It is shown that the addition of dither before quantization restores some of the pictorial information which a coarse
Ordered dither patterns for coarse quantization of pictures
Two-dimensional ordered dither patterns are reported and illustrated which provide better picture quality than equivalent random dither and which do not require synchronous subtraction.
A Decimal Code for Analog-to-Digital Conversion
  • B. Lippel
  • Computer Science
    IRE Trans. Electron. Comput.
  • 1 December 1955
Improvement of a Coarse Picture Quantizer by Means of Ordered Dither.
In this investigation, the quantization of dithered pictures is examined and it is shown that dither reinserts some of the picture information which a coarse quantizer, without dither, discards and that ordered dither patterns are much superior to random dither for this purpose.
Comments on "A New Technique for Displaying Continuous Tone Images on a Bilevel Display"
  • B. Lippel
  • Physics
    IEEE Trans. Commun.
  • 1 February 1978
It is shown that, when ordered dither is employed, the constrained-average algorithm presented in the above paper is equivalent to ordered-dither coding of a picture which has been subjected to a
A Method for Obtaining Complete Digital Coding Chains
Comments on "A fast analog to Gray code converter"
The successive-approximation method which encodes an analog voltage into Gray Code by using the absolute values of successive residues is very old, and references are given to some of the earliest
Experiments with a New Message Format for Digital Representation of Photographs.
Pictures decoded from the experimental format were compared with pictures reconstructed from PCM-format messages having the same or larger number of bits, indicating that a well-chosen embodiment of the experimentalformat offers better quality than PCM under the constraints of fixed message length and fixed number of brightness levels.
Negative-Bit-Weight Codes and Excess Codes
  • B. Lippel
  • Computer Science
    IEEE Trans. Electron. Comput.
  • 1 June 1964