JPS6153580A - Marker display interpolation apparatus for scan converter - Google Patents

Abstract

PURPOSE:To obtain easily visible high definition radar image, by writing the largest level one when a plurality of video data corresponding to one cell to prevent partial missing in the marker indication in the writing of the cell. CONSTITUTION:When a new sweep generates, a coordinate converting section 1 sends out coordinate data and video data 15 to a coordinate memory 4 and a comparison control section 5 one at a time. The control section 5 reads out the video data 16 of the same coordinate from the memory 4 corresponding to the data 15 and sends out the data 15 to an interpolation processing section 2 when the data 15 is larger than that 16 as a result of comparison while the memory 4 is updated with the data 15. On the other hand, when the data 15 is smaller than that 16, the contents of the memory 4 is not updated. Moreover, when the same data as the data 15 does not exist in the memory 4, the data 15 is sent to the processing section 2 while being written into the memory 4. Thus, when a plurality of sweeps hit the same cell, the largest level of data is always written thereby preventing missed indication of markers.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a marker display interpolation device that prevents discontinuous omission of marker display in a scan conversion device and displays markers appropriately.

[Prior art]

FIG. 6 is a block diagram showing the configuration of a conventional scan conversion device. This is an interpolation processing section that prevents pixels (hereinafter referred to as cells) from being omitted and sends video data to the display memory section (3).The display memory section (3) is connected to the interpolation processing section (2).
Save the video data sent from.

The conventional scan conversion device is configured as described above, and input coordinate data (6) and digitized radar video data (
7) is sent to the coordinate conversion unit (11), where it is converted from polar coordinates to rectangular coordinates.In the interpolation processing unit (2), video data is written into multiple cells at the same time to prevent incorrect display due to missing cells. Performs interpolation processing and displays display memory section (3)
write to.

As shown in FIG. 4, the interpolation process performed by the interpolation processing unit r21 is performed at a certain distance from the center and outside.
), write 01 is performed not only to the cell (9) that is hit, but also to one or more cells (9A) adjacent to it. -(This is to eliminate cells where lυ is not applied to prevent erroneous display.

However, in conventional scan converters, all cells are guaranteed to be hit in 11 rotations, but there is no one-to-one correspondence between soup data and cells, and for example, As shown in FIG. 5, in the center, data of a plurality of sweeps f81 correspond to one cell (91, and in this case, the last corresponding data is valid. Therefore, as shown in FIG. If video data 117J with a small area is input like a marker, the marker data +13 may be displayed 71 or not, and as shown in Figure 7, 11 marker display cells are added and marker display cell 1141 is missing This has the disadvantage that the data may be discontinuous and not connected.

[Summary of the invention]

This invention was made for the purpose of improving such drawbacks, and when a plurality of video data corresponds to one cell,
This invention relates to a marker display interpolation device for a scan conversion device that prevents marker display omission by incorporating video data of the highest level into the cell.

[Embodiments of the invention]

FIG. 1 is a block diagram showing one practical example of this invention.
In the figure, fil to f3) and (61, f7) are the same as the conventional device described above. (4) is the coordinate transformation section (11
The coordinate memo Ij, f51, which temporarily stores the orthogonal coordinates and video data created in This is a comparison control unit that controls whether to send data from the result to the interpolation processing unit (2) and whether to update the contents stored in the coordinate memory (4).

The operation of the marker display interpolation device of the scan conversion device configured as described above will be explained.

Radar sweeps always change direction continuously;
The button before a certain cell was hit by the sweep was hit by the previous sweep.

It is now assumed that the coordinate memory (4)K contains coordinate data and video data of a certain sweep. When a new sweep occurs, coordinate data and video data stock 9 are sent out one by one from the coordinate conversion section (1) to the coordinate memory (4) and the comparison control section (5). The comparison control unit (51 reads out the video data (IQ) at the same coordinates from the coordinate memory (4) in response to this new data aSK and compares it with the new video data. If the new video data is If the video data is larger than the video data f161, new video data is sent to the interpolation processing section (2), and at time m, the contents of the coordinate memo January 4) are updated to those of the new video data.

Conversely, if the new video data is smaller than the video data output from the coordinate memory (4), the new video data is not sent from the comparison control unit (5) to the interpolation processing unit (2), and the data stored in the coordinate memory (4) is The contents are not updated either.

Also, if there is no video data with the same coordinates as the new sweep coordinate data in the coordinate memory (4), the interpolation processing unit r21
Send new data to coordinate memo 1.
Write to Month 4).

If the above-mentioned operation is performed for all the data of the sweep, when a plurality of sweeps hit a low cell (1), the maximum level data is always written, and it is possible to prevent the marker from missing the display.

Note that in the above embodiment, the coordinate memory (4) was used, but the second
As shown in the figure, even if a display memory section (3) is used instead, the same effects as in the above embodiment can be obtained.

〔Effect of the invention〕

As described above, this invention prevents partial omission of marker display when writing to a cell by writing only the highest level data among them when a plurality of video data corresponds to one cell. Therefore, even small-area video data such as markers can be accurately expressed, and an easy-to-see, high-quality radar image can be provided.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a block diagram showing another embodiment of the invention, FIG. 3 is a block diagram showing a conventional scan conversion device, and FIG. 4 is a block diagram showing a conventional scan conversion device. The operation explanatory diagrams of the interpolation processing section shown in the figure, and FIGS. 5 to 7, are diagrams illustrating the principle of occurrence of missing marker display. (11...Coordinate transformation unit, (2)...Interpolation processing unit, C
3)...Display memory section, (4)...Coordinate memo 'J
, (51... Comparison control unit, (6)... Input coordinate data, (7)... Radar video data, (8)... Sweep, (91, (9A)... Cell, ( 1z...Marker piteo data, +13...Marker display cell, 1I
41... Marker display missing cell. In each figure, the giant 1- symbol indicates a direction or a corresponding portion. Representative criminal Patent attorney Sanro Kimura Figure 1 Figure 2

Claims (1)

[Claims] In a scan converter, a radar sweep conversion address is stored in a memory, the conversion address stored in the memory is compared with a newly generated radar sweep conversion address, and writing of video data is controlled based on the comparison result. A marker display interpolation device for a scan conversion device characterized by: