Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1986-08-18
1988-01-12
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358140, 128660, H04N 530, H04N 701
Patent
active
047195096
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The present invention relates to an apparatus for inserting one or more data sets between data sets concerning an image by interpolation, the inserted data sets being associated with the latter data sets. More specifically, the invention relates to a video data interpolation apparatus that is preferably used as an apparatus for interpolating video data between video data stored in the memory of an ultrasonograph.
2. Background Art
Japanese Patent Laid-Open No. 73785/1982 discloses a video data interpolation apparatus which inserts, by interpolation, a data set between video data sets stored in the memory of a sector-scan type ultrasonograph, the inserted data set being associated with the latter data sets. This apparatus uses three buffer memories for temporarily storing video data derived by a sector scan using scanning acoustic lines. More specifically, three acoustic lines are successively scanned to obtain three data sets, which are temporarily stored in their respective buffer memories. While the newest data set is being written to one buffer memory, data about an image are read at a high speed from the other two in a given sequence. The data read out are successively arithmetically processed to interpolate an intermediate data set between the data set obtained two sets previously to the presently written data set and the present data set. The resulting data sets are stored in their respective memories.
In this interpolation apparatus, while the newest data set concerning an image is being written to one buffer memory, the intermediate data set next to the data set that is two sets previous to the current set must be obtained by interpolation, and the obtained data set is stored in a memory. For this purpose, data must be read from some buffer memory at a higher speed than the speed at which data is written to it. That is, when the data set obtained by interpolation is one in number, data must be read from some buffer memory at a speed twice as high as the speed at which data is written to it. When the data sets derived are two in number, data must be read from some memory at a speed three times as high as the speed at which data is written to it. In this way, as the data sets obtained by interpolation increase in number, a higher reading speed is needed. Therefore, it is difficult to obtain a number of data sets by interpolation.
DISCLOSURE OF THE INVENTION
It is the object of the present invention to provide a video data interpolation apparatus which can readily produce a number of data sets by interpolation.
This object is achieved in accordance with the teachings of the invention by an apparatus comprising some pairs of buffer memories and an interpolation circuit, the two buffer memories of each pair alternately temporarily storing data sets regarding an image, the data sets being given successively. The currently incoming data is written bit by bit to one buffer memory of first pair and also to one buffer memory of second pair. In step with this writing operation, the immediately previous data set is read from the other of the second pair. Then, one or more data sets are interpolated between the data set read from the other of the second pair and the currently incoming data set, based on these two data sets. The data sets obtained by interpolation are written to one buffer memory of third pair and also to each one buffer memory of the subsequent pair or pairs. Concurrently with the writing of data to the buffer memories and reading of data from other memory, the values stored in the other of the first pair, the other of the third pair, and the other or others of the subsequent pair or pairs are read and stored in a video memory.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a block diagram of a video data interpolation apparatus fabricated in accordance with the invention for use in a sector-scan type ultrasonograph to obtain video data by interpolation; and
FIG. 2 is a diagram for illustrating the operation of the apparatus shown in FIG. 1.
BEST MODE FOR CA
REFERENCES:
patent: 4245250 (1981-01-01), Tieman
patent: 4310907 (1982-01-01), Tachita et al.
patent: 4618887 (1986-10-01), Birk
patent: 4649927 (1987-03-01), Fehr et al.
Britton Howard W.
Kojima Moonray
Peng John K.
Yokogawa Medical Systems Limited
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