[in Japanese]

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In designing an instrumentation system employing the television method, there are techniques such as line scanning, shutter recording and slow scanning to be considered.
The image dissector which is a nonstorage type scanner suitable for line scanning and the pickup storage tube which offers complete storage suitable for image pickup with shuttered recording and slow scanning are discussed here in comparison with the vidicon.
When a television system is used for measurement, the scanning speed, or the sampling rate, is varied according to the type of application, and so the signal to ratio of the pickup tube output varies and sometimes it becomes the major source of error in the measurement.
In this paper, the equations for the signal to noise ratio of these tubes in special image pickup and scanning conditions for measurement are introduced. The relationship between the signal to noise ratio and the scanning speed as well as the performances of these tubes and the limitations of the television method used for measurement are discussed.

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In this paper, a construction method is proposed for “two-dimensional recursive digital rotated filters” consisting of one-dimensional recursive digital filters connected in cascade.
Using this construction method, many of the filter design algorithms and analytical techniques which are well understood in one-dimension can be extended to two-dimensions, and many of the difficulties associated with two-dimensional systems, such as the lack of a factorization theorem, can be circumvented.
This method, in particular, has the advantage of less computational time and smaller computer memory.
A technique of inserting zero values among sample points is also proposed for higher cut-off frequency filters and it is shown that it requires little increase of computational time and computer memory size.

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