JPH0712920A - Radar display device - Google Patents

Abstract

PURPOSE:To enable display easy to view a plurality of radar images by adjusting a luminance value of an image data for display according to feature values of the radar images. CONSTITUTION:A selector 211 selects any of radar images to be inputted into a coordinate conversion processing section 212 according to a display mode to be inputted. The coordinate conversion processing section 212 sends out the image to an integration circuit 220 and a level conversion section 250 to be displayed on a CRT 202 and a mean M and a scattering V of luminance are determined with the integration circuit 220 and a division circuit 230 and the results are sent out to a luminance adjusting means 112. By the luminance adjusting means 112, a basic gain is obtained to multiply a video signal by it so that the video signal is normalized using an average luminance with viewing sensitivity to display color taken into consideration. In addition, a difference between the video signal and the average luminance is corrected and the radar image is displayed with a luminance of good visibility preserving a luminance distribution of the original radar image faithfully.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radar display device for displaying a radar image created by processing a signal obtained by a radar, and more particularly to a radar display device for displaying a plurality of types of radar images while switching or simultaneously displaying them. Regarding display device.

In recent years, traffic of ships and aircraft has become more and more popular, and congestion at ports and airports has become serious. On the other hand, due to automation of operation, ships and aircraft are operated by a small number of people.

For this reason, the burden on the controller and the operator is large, and the radar display devices mounted on ships and aircraft and the radar display devices installed at ports and airports are more visible. Ease and certainty are needed.

[0004]

2. Description of the Related Art By processing a radar signal, a clutter map image, CFAR (Constant False Alarm Rat)
e) Various radar images such as images can be obtained. Also, CRT
There are various display methods such as PPI (Plane Position Indicator) display, B display, C display, and fan-shaped display depending on the method of coordinate conversion processing when displaying on the display.

Here, by processing the radar signal, it is possible to extract clutter, which is a noise component reflected from waves on the ground surface or the sea surface. The clutter map image is
It is a radar image showing the distribution of this clutter. Also,
There is a technique that suppresses clutter by paying attention to the characteristics of the clutter, so that the probability of occurrence of a detection error that occurs when a target is detected with a radar signal intensity as a reference is a constant value. The CFAR image is a radar image obtained by suppressing clutter contained in the original radar signal using this technique.

FIG. 10 shows a clutter map image and CFAR.
Image and the radar image corresponding to the original radar signal (hereinafter RA
(Referred to as W image). In FIG. 10, each radar image is shown by changing the shaded density according to the magnitude of luminance. That is, a shaded portion having a high density shows high luminance, and a portion having a low density shows low luminance.

The conventional radar display device is designed on the premise that one of the above-mentioned radar images is selected and displayed, and the other radar images are occasionally referred to. It was displayed as it was with the brightness according to the intensity of.

[0008]

By the way, as shown in FIG. 10, the average luminances of various radar images are greatly different from each other. For example, in the CFAR image, only the bright spots indicating the target are displayed with the brightness according to the characteristics of the target, and the brightness of the background is very low, so that the average brightness is small. On the other hand, since clutter is often distributed over a wide range, the clutter map image generally has high brightness as a whole, and its average brightness is high. Further, the RAW image includes both clutter and the target, and thus the average brightness thereof is high.

On the other hand, operators and controllers are required to respond more promptly and accurately. For this purpose, it is necessary to provide the operator and the controller with as much information as possible so that the information can be easily recognized. For example, the radar images of a plurality of types as described above are frequently switched or a plurality of types of radar images are displayed. It is requested to display them at the same time.

However, when the CFAR image and the clutter map image or the RAW image are displayed simultaneously by dividing one screen or are frequently switched and displayed, there is a large difference in average luminance between the two radar images. Therefore, there is a possibility that the operator's eyes cannot cope with the change in the brightness and the target cannot be visually recognized accurately.

An object of the present invention is to provide a radar display device which displays a plurality of radar images with the same visibility.

[0012]

According to the invention of claim 1, in response to a switching instruction, the switching means 101 selects any one of image data representing a plurality of radar images of different types and displays it as image data for display. In the radar display device that sends the selected radar image to the means 102 and displays the selected radar image, the characteristic extraction unit 111 that calculates the characteristic value representing the characteristic of the radar image based on the input display image data, and the characteristic extraction unit 111 On the basis of this, a brightness adjusting unit 112 for adjusting the brightness value of the display image data and sending it to the display unit 102 is provided.

According to a second aspect of the present invention, the screen synthesizing means 103 has a plurality of different types according to a timing signal indicating a display timing corresponding to each of a plurality of partial screens obtained by dividing the display screen of the display means 102. In a radar display device that switches image data representing a radar image and sends it as display image data to the display unit 102 to display different radar images on respective partial screens, based on the input display image data, the radar A plurality of feature extraction means 111 for respectively calculating feature values representing the features of the image.
And an extraction control means 121 for selectively enabling the feature extraction means 111 corresponding to the corresponding partial screen according to the timing signal, and feature values obtained by the plurality of feature extraction means 111 according to the timing signal. A selection means 122 for selecting a characteristic value corresponding to the corresponding partial screen from the above, and a luminance adjusting means 112 for adjusting the luminance value of the display image data based on the characteristic value and sending it to the display means 102. Is characterized by.

The invention of claim 3 is the invention of claim 1 or claim 2.
In the radar display device according to the item 1, the feature extraction means 111
Is configured to calculate the average brightness of the radar image and output the average brightness as a feature value.
Of the normalization means 113 that normalizes the brightness value of the image data based on the average brightness and the display color information indicating the display color when the display means 102 displays the radar image. It is characterized in that it is provided with a color correction unit 114 for correcting the output value.

[0015]

According to the invention of claim 1, the characteristic extracting means 111 calculates the characteristic value of the radar image, and the luminance adjusting means 112 adjusts the luminance value of the display image data in accordance with the characteristic value to display the characteristic value. To the means 102.

As a result, it is possible to reduce the difference in average luminance when displaying each radar image. Therefore, even when a plurality of types of radar images are frequently switched by the switching means 101, each radar image is changed. Can be displayed with the same legibility.

The invention of claim 2 is the extraction control means 121.
However, the feature extracting means 111 corresponding to the partial screen is made effective, and the selecting means 122 selects the feature value from the corresponding feature extracting means 111 and sends it to the brightness adjusting means 112, whereby the radar image is obtained for each partial screen. Of the display image data is adjusted, and the brightness value of the corresponding display image data is adjusted.

This makes it possible to reduce the difference in average luminance of the radar images displayed on the respective partial screens of the display means 102. Therefore, the screen synthesizing means 103 is used to simultaneously display a plurality of types of radar images. Also in this case, each radar image can be displayed with the same ease of viewing.

According to a third aspect of the invention, the characteristic value calculating means 111
The average brightness is obtained as a feature value by the brightness adjustment means 11
The second normalizing unit 113 normalizes the brightness value of the display image data with the average brightness, and further, the color correcting unit 114 corrects the brightness value according to the display color and sends it to the display unit 102.

Thus, the difference in the average luminance of the radar images is reduced, and when these radar images are displayed in different display colors, the sensitivity of the human eye to each display color is taken into consideration, and a plurality of them are displayed. It is possible to display different types of radar images with the same ease of viewing.

[0021]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 3 shows a block diagram of an embodiment of the invention of claim 1.

In FIG. 3, the radar signal processing unit 201
Is configured to process an input radar signal to create a clutter map image, a CFAR image, and a RAW image, and input them to the radar image processing unit 210. The radar image processing unit 210 includes a selector 211 corresponding to the switching unit 101 and a coordinate conversion processing unit 212.
The selector 211 selects any of the radar images described above according to the input display mode, and the coordinate conversion processing unit 2
12 is input. The coordinate conversion processing unit 212 uses C in the coordinate system designated in the display mode described above.
In order to display on the RT display (CRT) 202,
The input radar image is converted into a video signal and sent to the integration circuit 220 and the level conversion unit 250.

The integrating circuit 220 and the dividing circuit 230 form the feature extracting means 111, and the integrating circuit 22
Based on the video signal corresponding to each pixel to which 0 is input, the integrated value of luminance and the integrated value of variance of each pixel are calculated,
The dividing circuit 230 divides the integral value and the variance integral value by the area of the display screen to obtain the average value M and the variance V of the luminance and send it to the luminance adjusting means 112.

FIG. 4 shows an integrating circuit 220 and a dividing circuit 23.
The detailed configuration of 0 is shown. In the integrating circuit 220 shown in FIG. 4, the video signal is input to one input terminal of the adder 221 and the squaring circuit 222. The output of the adder 221 is input to the other input terminal of the adder 221, and the adder 221 integrates the video signal. The output of the squaring circuit 222 is input to one input terminal of the adder 223, and the output of the adder 223 is input to the other input terminal of the adder 223.
3, the square value of the video signal is integrated.

The adders 221 and 223 described above are
The addition result is reset to the initial value "0" in response to the input of the screen end signal indicating that the video signal for one screen has been input.
The brightness of each pixel in the screen and the integrated value of its square value are calculated.

The outputs of the two adders 221 and 223 are input to a latch 224, which is held in the latch 224 in accordance with the screen end signal described above.
The position of the decimal point is adjusted by the level shifter 225, and the integrated value S of the brightness and the integrated value T of the square of the brightness are output.

The integrated value S of the luminance is output as it is and also input to the squaring circuit 226, and the integrated value T of the square of the luminance is input to the subtractor 227 together with the output of the squaring circuit 226 described above. The subtractor 227 calculates and outputs the integrated value NV of the luminance dispersion by subtracting the square of the integrated value S of the luminance from the integrated value T of the square of the luminance according to the input of the screen end signal described above. Has become.

Further, in FIG. 4, the division circuit 230 is
It is formed of two multipliers 231 and 232 and a selector 233 which selectively outputs a value corresponding to the reciprocal of the area of the display screen in response to the input of the display mode. The above-described integrated value S of brightness and integrated value NV of brightness dispersion are input to the two multipliers 231 and 232, respectively, and the output of the selector 233 is multiplied to calculate the average brightness M and the brightness dispersion V. Has become.

The reason why the selector 233 selects a numerical value corresponding to the reciprocal of the area is that the display area differs depending on the display method (PPI display, B display, etc.) designated in the display mode. A numerical value (1 / N ₁ to 1 / N _m ) corresponding to the reciprocal of each area may be set to the input terminal of the selector 233 corresponding to each display method.

In this way, the average brightness M and the brightness variance V are calculated as the characteristic values of the radar image, and are sent to the brightness adjusting means 112. Here, since the above-mentioned average brightness M and brightness variance V are calculated after integrating the video signals for one screen, naturally, 1
It is a feature of the radar image before the frame. But,
Since it is unlikely that the characteristic value of the radar image changes significantly for each frame, there is no particular problem even if the luminance of the video signal of the current frame is adjusted using the characteristic value of the previous frame.

In FIG. 3, the brightness adjusting means 112 includes a gain table 241, a correction table 242, and a multiplier 24.
3 and a level converting section 250. The gain table 241 stores the basic gain G ₀ corresponding to the combination of the average luminance M and the display color at the address indicated by the average luminance M and the color number C indicating the display color. That is, for example, by inputting the average luminance M and the color number C as the lower part and the upper part of the address, the corresponding basic gain G ₀ is obtained and sent to the multiplier 243.

Here, the basic gain G ₀ may be determined so that the pixel of the video signal having a size corresponding to the average brightness M is displayed with a predetermined brightness K. This predetermined brightness K is
For each display color represented by the color number C (1 to n), it may be obtained by such operator to visually recognize easily the luminance value K ₁ ~K _n experiments. That is, the value obtained by dividing the brightness K _C corresponding to the color number C by the average brightness M may be stored as the basic gain G ₀ in the gain table 241 corresponding to the color number C and the average brightness M.

By multiplying the video signal by this basic gain G ₀ , it is possible to normalize the video signal by using the average luminance M while considering the visibility of the display color. That is, the function of the brightness adjusting means 112 of claim 3 can be realized.

Further, the radar image processing section 210 uses a CRT.
Since the control information for instructing the display color is sent to the display 202, this control information may be input to the gain table 241 as the color number C.

When the display color is one color, the color number C is fixed, so that the average luminance M from the corresponding area.
The basic gain G ₀ corresponding to is read out. On the other hand, in the correction table 242, the address indicated by the brightness distribution V is
The correction value a corresponding to the brightness distribution V is stored, and the brightness distribution V is input to the address to obtain the correction value a and send it to the multiplier 243.

Here, the correction value a may be determined in advance by a function of the luminance dispersion V having a correlation with the reciprocal of the luminance dispersion V so that the value becomes larger than 0 and smaller than 1. .

The multiplier 243 multiplies the above-mentioned basic gain G ₀ and the correction value a, and the multiplication result is the gain G.
Is output to the level conversion unit 250. In general, not only the average value of the luminance but also the variation in the luminance differs depending on the type of the radar image, and the magnitude of the variation in the luminance also affects the visibility. Therefore, by determining the gain G in consideration of the luminance dispersion V as described above, more appropriate luminance adjustment can be performed in consideration of the visibility due to the variation in luminance.

FIG. 5 shows the detailed structure of the level converting section 250. In FIG. 5, the level conversion unit 250 includes a subtractor 25.
1, the average luminance M from the video signal corresponding to each pixel
Is subtracted, the obtained difference D and the above-mentioned gain G are multiplied by the multiplier 252, and the multiplication result is added by the adder 25.
3 is input. Also, the selector 254
The brightness values K _{1 to} K _n are set to the respective n input terminals of _{1 to n} corresponding to the color numbers _{1 to n} , respectively.
According to the input of the color number C, the corresponding luminance value K _C is selected and input to the adder 253.

As described above, the difference D between the video signal and the average luminance M is multiplied by the gain G, and the luminance value K _C is added to the multiplication result as an offset, so that the luminance distribution of the original radar image is faithfully preserved. However, the brightness value K is easy to see
_A radar image can be displayed with a brightness close to _C.

Of course, a brightness may be adjusted by simply multiplying the video signal and the gain G by using a multiplier instead of the level conversion section 250. As described above, by calculating the average luminance and luminance variance of the radar image displayed based on the video signal, and by using the gain obtained from this average luminance and luminance variance, the level of the video signal is converted. It is possible to reduce the difference in average luminance between various radar images.

As a result, since various radar images can be displayed with the same ease of viewing, the operator can easily and accurately view the target even when these radar images are switched and displayed one after another. Therefore, the burden on the operator can be reduced.

There are cases where the display screen of the CRT display 202 is divided into a plurality of partial screens and different radar images are displayed on each partial screen. In this case, it is necessary to extract the characteristics of the displayed radar image for each partial screen and perform level conversion of the video signal.

An embodiment of the radar image display device according to claim 2 will be described below. FIG. 6 shows the configuration of an embodiment of the radar image display device according to the second aspect. However, in FIG. 6, the same components as those of the radar image display device shown in FIG. 3 are designated by the same reference numerals.

In FIG. 6, the selector 311 of the radar image processing unit 310 selects the radar image specified in the input display mode and inputs it to the coordinate conversion unit 312, and this coordinate conversion unit 312 operates in the display mode. The radar images are coordinate-converted according to the designated display method, and are sent to the screen synthesis unit 313. The screen synthesizing unit 313 is configured to output the video signal of the radar image corresponding to each partial screen in the scanning period corresponding to the partial screen, according to the display mode. That is, the screen synthesizing unit 10 is configured by the selector 311 and the screen synthesizing unit 313.
It is configured to realize the functions of 3.

For example, as shown in FIG. 7, when it is instructed to divide the screen into four partial screens (indicated by numbers 1 to 4 in FIG. 7), the screen compositing unit 313
The horizontal scanning period and the vertical scanning period are divided into two with each center as a boundary, and in the first half of the vertical scanning period, the video signal of the radar image corresponding to the upper two partial screens 1 and 2 of the display screen is horizontally divided. The first half and the second half of the scanning period are alternately output, and similarly, in the second half of the vertical scanning period, the video signals of the radar images corresponding to the lower two partial screens 3 and 4 may be alternately output.

In this case, as shown in FIG. 6, four integrating circuits 320 _{1 to} 320 corresponding to four partial screens are provided.
₄ , a selector 331 that selects one of the outputs of these integrating circuits 320 _{1 to} 320 ₄ , and an integrating circuit 320 ₁
˜320 ₄ and a timing control unit 340 that controls the timing at which the selector 331 operates, and the output of the selector 331 may be input to the division circuit 230. In addition, by the radar image processing unit 310 described above,
A synchronization signal for displaying the radar image is supplied to the timing control unit 340.

The integrating circuits 320 _{1 to} 320 ₄ described above are
As shown in FIG. 8, instead of the adders 221 and 223 of the integrating circuit 220 shown in FIG. 4, adders 321 and 322 that perform an adding operation according to the integration valid signal are provided. Further, a screen end signal indicating the end of scanning of each partial screen is input from the timing control unit 340 to the latch 224 and the subtractor 227.

FIG. 9 shows the detailed structure of the timing control section 340. In FIG. 9, a switching table 341 stores a switching column address and a switching row address indicating a boundary of a partial screen corresponding to the display mode, and the switching column address and the switching corresponding to the input of the display mode. The row address and the row address are sent to the column counter 342 and the row counter 343, respectively.

The above-mentioned switching column address and switching row address are held in the column counter 342 and the row counter 343, respectively. The column counter 342 and the row counter 343 perform counting operations in accordance with the input column clock and row clock, respectively, and carry when the count value exceeds the held switching column address or switching row address. It is configured to output a logic "1" as a signal.

Further, in FIG. 9, the clock generation circuit 3
Reference numeral 44 denotes a column clock CK _C indicating updating of a column address and a row clock indicating updating of a row address, based on a display position signal indicating scanning timing corresponding to each pixel on the display screen.
CK _L is generated and input to the column counter 342 and the row counter 343, respectively. As the display position signal, a clock signal when the radar image processing unit 310 reads the image data of the radar image may be input.

The carry signal of the column counter 342 and row counter 343 described above is input to the flip-flop 345 _C, 345 _L respectively, the outputs of these flip-flops 345 _C, 345 _L, the rise of the corresponding carry signal Flip according to.

The column counter 342 and the flip-flop 345 _C may be reset according to the input of the horizontal synchronizing signal, and the row counter 343 and the flip-flop 345 _L may be reset according to the input of the vertical synchronizing signal.

Therefore, the output of the flip-flop 345 _C becomes logic “1” and logic “0” in the first half and the second half of the horizontal scanning period, respectively, and the flip-flop 345 _L
Output becomes logic "1" and logic "0" in the first half and the latter half of the vertical scanning period, respectively.

In FIG. 8, flip-flop 345 _C
Is output to one of the input terminals of AND gates 346 ₂ and 346 ₄ , and the inverted output of the flip-flop 345 _C is input to one of the input terminals of AND gates 346 ₁ and 346 ₃ . The output of the flip-flop 345 _L is input to the other input terminal of the AND gates 346 ₂ and 346 ₄ , and the inverted output of the flip-flop 345 _L is input to the other input terminal of the AND gates 346 ₁ and 346 ₃ . .

In this way, the flip-flop 345 _C ,
By combining the output of 345 _L and the inverted output and inputting them to the _four AND gates 346 _{1 to} 346 ₄ ,
The integration effective signals ~ which become logic "1" can be obtained at the timings when the video signals displayed on the partial screens 1 to 4 shown in FIG. 7 are transmitted, and the integration circuits 320 _{1 to} 320 shown in FIG. Sent to each of the _four .

In addition, the above-mentioned flip-flop 34
The outputs of 5 _C and 345 _L and the inverted output are input to the selector 331 as a 4-bit switching code indicating any of the _four integrating circuits 320 _{1 to} 320 ₄ .

The end signal creating section 347 uses the row counter 34.
The count value of 3 is monitored, and when it matches the switching row address or the last row address, the rising of the carry signal of the column counter 342 and the input of the horizontal synchronizing signal are detected, and the screen end signal of the corresponding partial screen is detected. As
The configuration is such that it is sent to the corresponding integrating circuit 320.

In accordance with the integration valid signal and the screen end signal generated as described above, a corresponding integration circuit 32 is provided.
By operating 0, it is possible to independently calculate the integral value and the square integral value of the video signal for the radar images displayed on the four partial screens.

Further, the selector 331 selects the integral value and the square integral value corresponding to the switching code and selects the multiplier 23.
1 and 232, and by multiplying by a value corresponding to the reciprocal of the area in the same manner as in the above-described embodiment, the brightness average M and the brightness variance V are obtained as the characteristic values of the radar image displayed on each partial screen. Each is obtained sequentially.

That is, the four integrating circuits 320 share the one dividing circuit 230, and each of these sections is provided with the four feature extracting means 111, and the selecting means 123 switches between these outputs. The equivalent function is realized.

In this way, the characteristic value of the corresponding radar image can be input to the brightness adjusting means 112 in synchronization with the video signal corresponding to each partial screen. Therefore, the luminance average M and the luminance variance V obtained corresponding to each partial screen are input to the luminance adjusting means 112, and the luminance of the video signal of the pixel included in each partial screen is input in the same manner as in the above-described embodiment. Should be adjusted.

As a result, when the screen of the CRT display 202 is divided and different types of radar images are displayed on the respective partial screens, each radar image is displayed in accordance with the visibility of the display color, the average luminance and the luminance dispersion. It can be displayed with an appropriate brightness value.

Therefore, the radar image of each partial screen is
Regardless of the type, since the information is displayed with the same ease of viewing, the operator can quickly and accurately obtain a large amount of information from these radar images, and the burden on the operator can be reduced.

[0064]

As described above, according to the present invention, by adjusting the display brightness according to the characteristics of a radar image, various types of radar images are frequently switched and displayed, or a plurality of types of radar images are displayed. When displaying images simultaneously, it is possible to display radar images with the same ease of viewing regardless of the type and display color. As a result, the operator can quickly and accurately obtain a large amount of information from the radar image, and the burden on the operator can be reduced.

[Brief description of drawings]

FIG. 1 is a principle block diagram of a radar image display device according to claim 1.

FIG. 2 is a principle block diagram of the radar image display device according to claim 2;

FIG. 3 is a configuration diagram of an embodiment of the radar image display device according to claim 1;

FIG. 4 is a detailed configuration diagram of an integrating circuit and a dividing circuit.

FIG. 5 is a detailed configuration diagram of a level conversion unit.

FIG. 6 is a configuration diagram of an embodiment of the radar image display device according to claim 2;

FIG. 7 is an explanatory diagram of screen division.

FIG. 8 is a detailed configuration diagram of an integrating circuit.

FIG. 9 is a detailed configuration diagram of a timing control unit.

FIG. 10 is an explanatory diagram of a radar image.

[Explanation of symbols]

 101 switching means 102 display means 103 screen synthesizing means 111 feature extracting means 112 brightness adjusting means 121 extraction controlling means 122 selecting means 201 radar signal processing unit 202 CRT display (CRT) 210,310 radar image processing unit 211,233,254,311 , 331 Selector 212, 312 Coordinate conversion processing unit 220, 320 Integration circuit 221, 223, 253, 321, 322 Adder 222, 226 Square circuit 224 Latch 225 Level shifter 227, 251 Subtractor 230 Division circuit 231, 232, 243, 253 Multiplier 241 Gain table 242 Correction value table 250 Level converter 313 Screen combiner 340 Timing controller 341 Switching table 342 Column counter 343 Row counter 344 Clock generation times 345 flip-flop (FF) 346 and gate 347 end signal generating unit

Claims (3)

[Claims] 1. A switching means (101) according to a switching instruction.
Are selected as image data for display by selecting one of the image data representing a plurality of radar images of different types (1
In the radar display device for transmitting the selected radar image to the display device 02), the characteristic extraction means (11) for calculating the characteristic value representing the characteristic of the radar image based on the input image data for display.
1) and a brightness adjusting unit (112) which adjusts the brightness value of the display image data based on the feature value and sends it to the display unit (102). . 2. A plurality of radars having different types of screen synthesizing means (103) according to a timing signal indicating a display timing corresponding to each of a plurality of partial screens obtained by dividing the display screen of the display means (102). Image data representing an image is switched to create display image data, and based on the display image data, the display means (102) is input in a radar display device that displays different radar images on respective partial screens. A plurality of feature extracting means (111) for calculating feature values representing the features of the radar image based on the display image data, and a feature extracting means (111) corresponding to the corresponding partial screen in accordance with the timing signal ( Extraction control means (121) for selectively activating (111), and the plurality of feature extraction means (11) according to the timing signal. 1) selecting means (122) for selecting a characteristic value corresponding to the relevant partial screen from the characteristic values obtained in 1), and adjusting the brightness value of the display image data based on the characteristic value, and displaying means. A radar display device comprising: a brightness adjusting means (112) for sending to (102). 3. The radar display device according to claim 1 or 2, wherein the feature extraction means (111) calculates an average brightness of the radar image and outputs the average brightness as a feature value. A brightness adjusting means (112) normalizes means (113) for normalizing a brightness value of image data based on the average brightness, and a display indicating a display color when the display means (102) displays a radar image. The normalizing means (113) according to the color information
And a color correction unit (114) for correcting the output value of the radar display device.