JP2567759B2 - Detection image color display device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a detected image color display apparatus for displaying a detected signal on a color display by color-coding it according to its level.

[0002]

2. Description of the Related Art Conventionally, in a detection image color display device such as a color display fish finder or a color display radar, the detection signal is converted into image data having a digital value corresponding to the level, and this image data is further color-converted. There is provided a code converter which converts the color code into a corresponding color code, and converts the color code into R, G, and B color signals in a color display to display a detected image (for example, , Japanese Examined Patent Publication No. 60-58833).

Such a color display has an advantage over the case of a single color gradation display, for example, the size and type of a school of fish can be easily identified.

However, if different colors are assigned according to the level of the detection signal, the colors become too many,
An image with the color that is really needed can be difficult to distinguish due to the colors of the surrounding images.

In order to improve this problem, in the prior art, detection signals within a certain level range are
By assigning the same color code, the color types of the detected images displayed in color are limited.
There is a so-called partial achromatizer.

Specifically, in the color code converter, in a normal color display, as shown in FIG. 3A, the color code is set so that different colors are assigned according to the signal level of the detection signal. However, in the case of performing partial achromatization, for example, in FIG. 3 (a), the detection signal in a specific level range (here, the range of levels 0 to 3) is as shown in FIG. 3 (b). In addition, the level is forcibly replaced with a color code corresponding to all 0 levels so that the hue displayed in color (blue in this example) is the same and the gradation is also the same.

[0007]

However, as in the prior art, all the signals included in the specific level range of the detection signal are assigned to the same color code because the detection signal is reduced by the number of display colors. The amount of information based on is reduced. Therefore, the contours of the school of fish may become unclear.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and even when partial achromatization is performed, detection with a signal level to be the target of the partial achromatism is performed. It is intended to prevent the loss of signal information.

Therefore, according to the present invention, a color code converter for converting a detection signal into a color code corresponding to the level, and a color code read from the color code converter is converted into a color signal for image display. In a detected image color display device provided with a color display device, an operation section for giving a command signal for partial achromatic display switching, and a predetermined area of the color code converter specified by the command signal from this operation section, Gray display switching means for changing to a color code whose hue is gray and has a gradation according to the level of the detection signal.

[0010]

In the above structure, when partial achromatization is performed,
A command signal for switching the partial achromatic display is output from the operation unit.
In response to this command signal, the gray display switching means changes a certain area of the color code converter to a color code having a gray hue and a gradation corresponding to the level of the detection signal.

Therefore, the detection signal having the signal level included in the object of partial color erasure has the same hue in gray, but the color code is assigned so that the gradation changes according to the signal level. Level information is not lost.

[0012]

1 is a block diagram showing an embodiment in which the present invention is applied to a color display fish finder as a detected image color display device.

In the figure, reference numeral 1 is a transmission / reception unit for transmitting and receiving ultrasonic waves, and 2 is data having a digital value corresponding to the level of the detection signal, as well as performing detection and noise removal for the detection signal obtained by the transmission / reception unit 1. The signal processing unit 3 for converting into a signal is an operation unit for giving a command signal for switching the partial achromatic display.

Reference numeral 4 denotes a CPU, which has a predetermined area of a color code converter 7 (described later) designated by a command signal from the three operation units, has a gray hue and has gradation corresponding to the level of the detection signal. It serves as a gray display switching means for changing to a color code.

Reference numeral 5 is a ROM programmed with the control operation of the CPU 4, 6 is a video RAM for storing data having a digital value corresponding to the level of the detection signal as image data,
Reference numeral 7 is a color code converter for converting the image data read from the video RAM 6 into a color code corresponding thereto, and 8 is a color code converter for converting the color code read out into a color signal to display an image. It is a color display. Also, 9 is data from the CPU for the video RAM 6
And a CRT controller for generating a sync signal for the color display 8 while transferring the data to the CRT.

Next, the operation of the above configuration will be described.

The detection signal obtained based on the transmission and reception of ultrasonic waves by the transmitter / receiver 1 is subjected to processing such as detection and noise removal in the signal processing unit 2, and the level of the detection signal is converted into a digital value. . And these data are the CPU
4 is expanded on the video RAM 6 via the CRT controller 9.

The data read from the video RAM 6 in synchronization with TV scanning is given to the color code converter 7 as a color code read address. In the case of normal color display, the color code converter 7
As shown in FIG. 2A, the color code is set in advance by the CPU 4 so that different colors are assigned corresponding to the level (digital value) of the detection signal.
Therefore, individual color codes are read out from the color code converter 7 according to the level of the detection signal, and these color codes are sent to the color display 8. The color display 8 converts the color code into a color signal and displays the image. As a result, the detection image color-coded according to the signal level of the detection signal is displayed on the screen.

On the other hand, when partial erasing is performed, the operation unit 3
Gives a command signal for switching the partial achromatic display to the CPU 4. The CPU 4 changes the predetermined area of the color code converter 7 designated by this command signal into a color code having a gray hue and a gradation corresponding to the level of the detection signal. For example, as shown in FIG. 2B, when a command signal is continuously input four times from the operation unit 3, the CPU 4 sets the color code of R, G, B of the portion corresponding to level 0 to “00”.
"111" to that of the part corresponding to level 1 to 0 "
Then, the portion corresponding to level 2 is rewritten to "222" and the portion corresponding to level 3 is rewritten to "333". Therefore, when an image based on a detection signal having a signal level (range of levels 0 to 3 in this example) included in the target of partial color erasing is displayed, all hues are the same in gray but the gradation is the same. Changes according to the signal level.
That is, at level 0, it becomes dark, but at level 3, it becomes whitish.

As described above, the information on the detection signal level which is the target of partial color erasure is not lost as in the conventional case.

In the above embodiment, partial achromatization is performed in order from the smallest detection signal level, but the color code is changed such that white to gray changes in order from the highest level. You can also choose to do so.

Further, only those within a certain desired signal level range may be color-coded and displayed, and all those at the remaining signal level may be partially achromatic. For example, as shown in FIG. 2C, only the detection signals corresponding to level 4 and level 5 are color-coded and displayed, and the remaining ones are displayed.
It is also possible to make all the hues (having signal levels 0 to 3 and 7 to 15) gray and to change the gradation according to the signal level. If you do this,
The color-displayed part is further emphasized, which is convenient for identifying the school of fish.

[0023]

According to the present invention, when a detection signal included in a predetermined level range is assigned to a single color and partial achromatization for limiting the type of display color of a color-displayed detection image is performed, The detection signal with the signal level that is the target of partial achromatization has the same hue as gray, but since the color code is assigned so that the gradation changes according to the signal level, the level information of the detection signal is lost. Absent. Therefore, inconveniences such as the contour of the school of fish becoming unclear can be avoided.

[Brief description of drawings]

FIG. 1 is a block diagram of a detected image color display device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of changing the contents of a color code set in the color code converter of the present invention.

FIG. 3 is an explanatory diagram of changing the contents of a color code set in a conventional color code converter.

[Explanation of symbols]

3 ... Operation part, 4 ... CPU (gray display switching means), 7 ... Color code converter, 8 ... Color display device.

Claims (1)

(57) [Claims] 1. A color code converter (7) for converting a detection signal into a color code according to its level, and a color code read out from this color code converter (7) is converted into a color signal to produce an image. In a detection image color display device provided with a color display (8) for displaying, an operating section (3) for giving a command signal for switching partial achromatic display and designation by a command signal from this operating section (3) Said color code converter
A detected image color display device comprising: a gray display switching means (4) for changing the predetermined area of (7) to a color code having a gray hue and a gradation corresponding to the level of the detection signal. .