[in Japanese]

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[in Japanese]

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[in Japanese]

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[in Japanese]

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[in Japanese]

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When an ITV camera is used as an input device of a digital image processing system, a conventional shading correction is not good enough for quantitative image processing. Shading correction by software puts a heavy time-consuming burden on a main computer.
In this paper, a TV digitizer with shading correction function controlled by a microprocessor is presented. In the measurement mode, the processor automatically measures the degree of shading and makes up a correction table in RAM area. The gain of a video amplifier is controlled by data read out from the table in DMA mode. In the run mode, digitized data as well as analog signal for monitoring after shading correction are simultaneously obtained.

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This paper describes a new beam indexing color TV system. The beam indexing signal is initially picked up only at the start of each vertical scan from index phosphor stripes which are provided outside the upper effective display area of a new color CRT, and temporally stored during the successive frame scanning. The stored signal is retrieved at the beginning of each horizontal scan, signal processed, and applied to the beam indicating its instantaneous location.
As the beam indexing is kept stable without bias beam current, high color purity and saturation characteristics are obtained.
Some conditions required for correct color reproduction are examined and discussed.

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