Accession Number:

AD0601666

Title:

CODING COLOR PICTURES.

Descriptive Note:

Doctoral thesis,

Corporate Author:

MASSACHUSETTS INST OF TECH CAMBRIDGE RESEARCH LAB OF ELECTRONICS

Personal Author(s):

Report Date:

1964-06-17

Pagination or Media Count:

43.0

Abstract:

A computer-simulation study of efficient coding for color pictures has been undertaken. Two typical color transparencies were resolved into three primaries, sampled in a square array and recored digitally on magnetic tape. The computer program transformed these data into luminance and chrominance quantities, performed certain parameter modifications, reconverted them into primary-color quantities and wrote them on an output tape. The parameters that were modified were the effective number of samples per picture and the number of quantum values each for the luminance and for the chrominance. The output tape was played back through the recorder-reproducer to produce images of the coded pictures on the face of the cathode-ray tube, which were photographed through appropriate filters on color film. The resultant transparencies were later viewed and compared by a number of observers to determine the absolute and relative quality achieved with the various codes as affected by the variously modified parameters. Also, a test was run with a large number of observers to determine the relative recognizability of objects in one of the pictures when variously coded in color or monochromatically. Two major conclusions were drawn from this study. i A normal monochromatic picture can be converted into a full color picture of the same apparent sharpness by transmitting additionally only a fraction of a bit per sample. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE