Binary symmetric channel error effects on PCM color image transmission.
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Pratt, W. K.↗
Engineering topics
Pratt, W. K.
Publications and source records attributed to Pratt, W. K..
Performance measures for transform data coding.
This paper develops performance criteria for evaluating transform data coding schemes under computational constraints. Computational constraints that conform with the proposed basis-restricted model give rise to suboptimal coding efficiency characterized by a rate-distortion relation R(D) similar in form to the theoretical rate-distortion function. Numerical examples of this performance measure are presented for Fourier, Walsh, Haar, and Karhunen-Loeve transforms.
Pearl, J.↗
Spatial transform coding of color images.
The application of the transform-coding concept to the coding of color images represented by three primary color planes of data is discussed. The principles of spatial transform coding are reviewed and the merits of various methods of color-image representation are examined. A performance analysis is presented for the color-image transform-coding system. Results of a computer simulation of the coding system are also given. It is shown that, by transform coding, the chrominance content of a color image can be coded with an average of 1.0 bits per element or less without serious degradation. If luminance coding is also employed, the average rate reduces to about 2.0 bits per element or less.
Pratt, W. K.↗
COPTRAN - A method of optimum communication systems design
Single set of mathematical expressions describes system cost and probability of error of data transmission in terms of four basic parameters in the link equation. A Lagrange multiplier sets up equations whose solutions yield the optimum values for system design considerations and weight and cost values.
Brinkman, K. L.↗
Optical heterodyne receiver design by nonlinear recursive estimation techniques
Optical heterodyne receiver design, using nonlinear recursive techniques to estimate atmospheric fluctuation effects on IF signal characteristics
Pratt, W. K.↗
Optimization of optical communication systems
Optical communication systems cost and weight optimization by COPTRAN program
Hinckley, R.↗
An algorithm for a fast Hadamard matrix transform of order twelve
Computational algorithm for fast Hadamard matrix transform of order 12 via factorization
Pratt, W. K.↗
Study and development of a mathematical analysis for the performance assessment of space communication system parameters Final report
COPTRAN program and users manual update for space communication system performance testing
Brinkman, K. L.↗
Transform processing and coding of images Final report
Transform processing and image coding
Andrews, H. C.↗
Hadamard transform image coding.
Fourier transform algorithm introduction leading to image coding technique with image transformed by Hadamard matrix operator
Andrews, H. C.↗
Laser Communication Systems.
Book on laser communication system design covering modulation and detection methods
Pratt, W. K.↗
Transformation coding for noise immunity and bandwidth reduction
Fourier and Hadamard transformation codings for multidimensional data channel noise immunity and bandwidth reduction
Andrews, H. C.↗
Television bandwidth reduction by encoding spatial frequencies.
Fourier coding method for coding images for digital transmission, achieving bandwidth reduction for televised images
Andrews, H. C.↗
User's manual for COPTRAN, a method of optimum communication system design
User manual for COPTRAN /communication system optimization program translatory
Brinkman, K. L.↗
Study and development of a mathematical analysis for the performance assessment of space communication system parameters
Electronic computer program user manual for optimum design of space communication system
Brinkman, K. L.↗
Computer calculated diffraction patterns.
Diffraction patterns calculated by computing two dimensional Fourier transform of aperture electric field
Andrews, H. C.↗
Advanced analog television study final report, 4 nov. - 19 dec. 1963
Information bandwidth reduction for analog television signals - Description of multiple interlace system
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