Color encoder measurement system with adjustment of amplitude ra

Details Color encoder measurement system with adjustment of amplitude ra Color encoder measurement system with adjustment of amplitude ra

1991-10-25

1993-05-25

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 27, H04N 1702

Patent

active

052145000

ABSTRACT:
Characteristics of a color encoder can be measured under the same condition as a practical operation without modifying the color encoder as a device under test. A test signal generator generates R, G and B component signals as test signals and they are applied simultaneously to the color encoder. The output amplitudes and/or output phases of the component signals from the test signal generator are adjusted such that the color encoder produces at least one of a luminance signal, an I-axis signal and a Q-axis signal in accordance with a measurement item.

REFERENCES:
patent: 4167751 (1979-09-01), Wilcox
patent: 4214258 (1980-07-01), Van der Valk
patent: 4679072 (1987-07-01), Takayama
patent: 5001549 (1991-03-01), Holmbo et al.
Lang et al., "Testing Color Reproduction by Means of a Programmable Color Bar Generator", SMPTE Journal, vol. 87, pp. 579-582, Sep. 1978.

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