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I/O Systems

Method-and-apparatus-for-converting-an-image-signal

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Method and apparatus for converting an image signal

Details

Inventors: Maekawa, Hitoshi;
Assignee: Hitachi, Ltd. (Tokyo, JP)
Primary Examiner: Britton; Howard W.
Assistant Examiner:
Attorney, Agent or Firm: Kenyon & Kenyon

Method and apparatus for converting a hivision TV image signal to a computer terminal image signal are disclosed. Three line memories are provided for three continuous scan lines in a field. Data of one scan line of a hivision TV image signal is written into one of the three line memories and data previously written into other two are read therefrom. A read sampling clock period is set to be 4/5 of a write sampling clock period, and the outputs of the two line memories are linearly interpolated so that the scan lines appear at the same position in first and second fields.

DETAILED DESCRIPTION It is an object of the present invention to resolve the problems encountered in the prior art, eliminate the difference between aspect ratios and the shift of information by one-half scan line interval and convert a hivision TV image signal to a computer terminal image signal without losing a high image quality of the hivision TV.
In order to achieve the above object, in accordance with the present invention, three memories for three continuous scan lines in one field are provided, and one line signal of the hivision TV image signal is written into one of the memories (write mode) and two line signals stored in other two memories are read (read mode).
A ratio of a write clock to a read clock is set to 5/4 so that the difference between the aspect ratios is resolved.
On the other hand, the two line signals read from the memories are interpolated to produce an image signal corresponding to a position of a first field line from the image signal of a second field of a hivision TV image (interlace) to resolve the shift of information by one-half scan line interval.

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