JP2845229B2 - Display method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a display system,
In particular, the present invention relates to a display system that facilitates visual recognition of the strength of a target signal.

[0002]

2. Description of the Related Art As a display method of a received signal in a sonar device, a PPI display method in which an arrival direction of a signal corresponds to a circumference and a distance corresponds to a length from a center, and an arrival direction of a signal is represented on a horizontal axis. B to make the distance correspond to the vertical axis
The scope display method is common. The target display of such a sonar is disclosed in JP-A-4-84792 and JP-A-3-396.
No. 34, the intensity of the target signal is displayed in correspondence with the luminance on the display.

[0003]

However, in the method of displaying the intensity of the target signal in correspondence with the brightness of the display, even if the signal intensity of the target signal is somewhat high, the display range is displayed as a small point. The brightness of the points that the human eye perceives is not very bright,
It feels rather dark. Therefore, even with a strong target signal, it is difficult to determine the presence of a small point target and its signal strength.

Accordingly, an object of the present invention is to provide a display system which makes it possible to easily recognize the presence and strength of even a small point target.

[0005]

According to the present invention, there is provided a display method for displaying a circle having a center corresponding to a position corresponding to position information of a target signal and having a radius corresponding to a level of the target signal. This is performed on the display screen in correspondence with the target signal.

[0006] Here, the target signal displayed in a circle is a signal having a level equal to or higher than a predetermined threshold value. No part is displayed. The correspondence between the level and the radius of the display circle may be a proportional relation or a logarithmic relation, and the display method may be for sonar display.

[0007]

Next, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a configuration block diagram showing an embodiment of a display system according to the present invention.

Referring to FIG. 1, display input data is input to a signal level determining circuit 1 and also to a circle data superimposing circuit 4. The signal level determination circuit 1 determines whether or not the level (strength) of the input display input data is equal to or higher than a predetermined threshold value. The signal is sent to the circle data generation circuit 2. The circle data generation circuit 2 generates circle data centered on the position (target position) of the display input data with a radius corresponding to the level indicated by the received level signal. Here, the correspondence between the received signal level and the radius of the generated circle can be determined based on a monotone increasing function such as a proportional function or a logarithmic function. The circle data generated from the circle data generation circuit 2 is sent to the circle data duplication prevention circuit 3.

In the circle data duplication prevention circuit 3, there are two or more targets of the display data sent from the circle data generation circuit 2. When the circle data having the radius of each display data level is received, the two or more circles are displayed. The overlapped portion of the circle on the display is calculated, and data is output to the circle data generation circuit 2 so that the overlapped portion becomes circle data with the erased portion. The circle data generation circuit 2 outputs circle data in which overlapping portions of a plurality of circles have been deleted. The circle data output in this way is sent to the circle data superimposing circuit 4, superimposed on the original display input data, and sent to the display as display output data. Therefore, on the display, a target having a level equal to or higher than a predetermined level is displayed together with its position in the form of a circle having a radius corresponding to a target signal level centered on the target position, When displaying two or more goals, they are displayed in such a manner that their circles do not overlap. As a result, the target of a small point can be easily determined by the circle drawn around the target, and the intensity of the target signal can be easily determined based on the size of the circle.

Next, the display screen of the display device of the above embodiment will be described in detail with reference to FIG. In FIG.
An example of a display screen in the embodiment shown in FIG. 1 is shown,
3 equal to or higher than a predetermined level from the signal level determination circuit 1
A display example when two target data are output is shown.

In FIG. 2, three target signals T1, T2, and T3 in circles C1, C2, and C3 are target signals as display input data equal to or higher than a threshold value. Is a signal stronger than the target signals T1 and T3, and other display input data is not displayed because it is display input data less than the threshold value.

In the figure, three target signals T1, T2, T3 are displayed near the center of the display screen, and circles of radii R1, R2, R3 corresponding to the levels of the respective target signals are displayed. Here, since the circle data is output from the circle data generation circuit 2 so that a portion where the circles overlap each other (indicated by a dotted line in FIG. 2) is not displayed, each target as shown in FIG. Circles (partial circles) C1, C2,
C3 is displayed.

Circles C1 to C3 surrounding three target signals T1 to T3
The center of C3 coincides with the display position of each of the three target signals T1 to T3. A circle C1 surrounding three target signals
ＣC3 have three radii R1 to R3, respectively.
Since the circle C2 surrounding the target signal T2 is larger than the circles T1 and T3 surrounding the other target signals, the target signal T2 is located at the center of the circle C2 surrounding the target signal. Can be easily visually recognized as a signal stronger than the other target signals T1 and T3.

As described above, if a circle surrounding another target signal overlaps with one target signal, the target signal itself becomes invisible, so that the overlapping portion of the circles C1 to C3 surrounding the three target signals is deleted, and the target signal is deleted. T1 to T3 overlap with the circumferences of the circles C1 to C3 surrounding the other target signals to prevent them from being invisible.

As described above, in the display method of the present invention, when the intensity of a target signal is equal to or higher than a certain level, a circle centered on the target position is drawn with a radius corresponding to the intensity. In addition, even when the intensities of two or more target signals are equal to or higher than a certain level, the lines where the circles overlap are erased so that the display of each target signal is not erased by another circle. For this reason, the existence of a small point target can be easily determined by the circle drawn around it,
The intensity of the target signal can be easily determined as the size of the circle.

Although the above embodiment has been described with reference to the sonar display system, it is apparent that the present invention can be applied to a similar display system such as a radar display system.

[0017]

As described above, according to the display method of the present invention, the existence of a target of a small point can be easily determined by the circle drawn around the target, and the intensity of the target signal is determined by the size of the circle. Since it can be easily determined as such, it is easy for the human eye to determine the presence of a target at a small point that is difficult to see and its signal strength. Therefore, a display with high visibility is possible.

[Brief description of the drawings]

FIG. 1 is a configuration block diagram showing an embodiment of a display method according to the present invention.

FIG. 2 is a diagram showing a display example in the embodiment shown in FIG. 1;

[Explanation of symbols]

 1 Signal level judgment circuit 2 Circle data generation circuit 3 Circle data duplication prevention circuit 4 Circle data superimposition circuit

Claims (5)

(57) [Claims] 1. A display method comprising: displaying a circle centered on a position corresponding to position information of a target signal and having a radius corresponding to the level of the target signal on a display screen in correspondence with the target signal. 2. The display system according to claim 1, wherein the target signal displayed in a circle is a signal having a level higher than a predetermined threshold value. 3. When there are a plurality of target signals to be displayed, the overlapping portion of the corresponding circle display portion is not displayed.
Display method described in. 4. The display method according to claim 1, wherein the correspondence between the level and the radius of the display circle is a proportional relation or a logarithmic relation. 5. The display system according to claim 1, wherein the display system is for sonar display.