JP4941406B2 - Display device - Google Patents

Description

  The present invention relates to a display device that displays an image captured by an imaging unit.

  As a vehicle-mounted display device, a night view monitor device that displays a night image captured by a near-infrared camera and supports a driver's vision when traveling at night has been put into practical use. This night view monitor device displays a night video based on a video signal representing a night video taken by a near-infrared camera (see Patent Document 1).

  If the video signal is abnormal due to a failure or disconnection of the near-infrared camera, the night video disappears and an indefinite video such as “sandstorm display” or “stripe display” is displayed. In order to avoid this indefinite video, generally, when the video signal is abnormal, an abnormal image representing this is displayed instead of the indefinite video. As an abnormal image, for example, a blue background with a message such as “No video input” is displayed on a blue background.

In a night view monitor device in which a video conversion means such as an A / D decoder converts a video signal into a converted video signal and displays a night video, when the video signal is abnormal, the A / D decoder is abnormal such as a blue back. An abnormal image signal representing an image is output. A blue background is displayed based on the abnormal image signal.
JP 2000-46521 A

  On the other hand, when the video signal is abnormal, there is a request to store the abnormality information in a memory and use the stored abnormality information for troubleshooting. The troubleshooting is, for example, analyzing the stored abnormality information in a dealer or the like, and quickly investigating the cause of the abnormality, and repairing or replacing the failed part.

  However, when the video signal is abnormal, the A / D decoder outputs an abnormal image signal representing a blue background or the like. Since this abnormal image signal is normal as a signal, an IC that can store abnormal information subsequent to the A / D decoder and display an abnormal image such as a blue back on the display unit is normal. The video signal may be erroneously determined and an abnormality in the video signal may not be detected. For this reason, there is a possibility that the storage of the video signal abnormality and the display of the abnormal image cannot be performed. Note that the A / D decoder is not provided with means for storing abnormality information or displaying an abnormal image, or means for notifying the subsequent IC of an abnormality in the video signal by communication or the like.

  Further, when the operation of the near-infrared camera is stopped by turning off the camera switch (when the operation is off), the video signal from the near-infrared camera is not output. For this reason, there is a possibility that this state is erroneously determined that the video signal is abnormal and erroneously stored in the memory.

  The present invention has been made in consideration of such circumstances, and when the video signal from the imaging means is abnormal, this information is stored in a display device that displays an image representing this, It is an object to prevent this information from being erroneously stored when the imaging means is turned off.

  In order to achieve the above object, the present invention employs the following technical means.

  According to the display device of claim 1, imaging means for outputting a video signal representing the video being shot, and converting the video signal into a converted video signal, determining whether the video signal is abnormal, When the video signal is abnormal, the output of the abnormal image signal indicating abnormality and the output of the converted video signal are prohibited, and the video conversion means for outputting the converted video signal when the video signal is normal and the imaging means are activated. A determination means for determining whether or not the converted video signal is output from the video conversion means, and if the determination means determines that there is no output, a storage means for storing information indicating that there is no output and a determination that there is no output. A signal output means for outputting an abnormal image signal, a table for displaying the abnormal image by receiving the abnormal image signal from the signal output means and displaying the video by receiving the converted video signal from the video conversion means. Characterized in that it comprises a means.

  According to this configuration, when the video signal is abnormal, the video conversion unit does not output both the abnormal image signal and the converted video signal, so that the determination unit can determine that the converted video signal is not output. It is possible to determine the abnormality of the video signal. Therefore, it is possible to store the information on the determination of no output, that is, the information on the abnormality determination of the video signal in the storage unit.

  Further, in this configuration, when it is determined that there is no output, the signal output unit outputs the abnormal image signal instead of the video conversion unit, and the display unit displays the abnormal image based on the abnormal image signal. Therefore, it is possible to display an image representing an abnormality of the video signal while enabling the determination of the abnormality of the video signal by the determination unit.

  Furthermore, according to this configuration, when the imaging unit is operating, the determining unit determines whether or not the converted video signal is output from the video converting unit. Is not memorized by mistake. Therefore, when the video signal from the image pickup means is abnormal, this information is stored in a display device that displays an image representing this, and this information is not stored in error when the image pickup means is turned off. Can be.

  According to the display device of the second aspect, the signal output means determines whether or not the imaging means is operating.

  According to this configuration, the signal output unit that outputs an abnormal image signal when it is determined that there is no output determines whether the imaging unit is operating. Therefore, the above-described effects can be obtained without complicating the configuration. Obtainable.

  According to the display device of the third aspect, the signal output means outputs a mark image signal of a mark image indicating the monitoring target in the video when the determination means makes an output determination, and in the case of an output determination, A signal synthesizing unit that synthesizes the converted video signal and the mark image signal and outputs the synthesized signal to the display unit is provided, and the display unit superimposes the video and the mark image based on the synthesized signal when the output is determined. A superimposed image is displayed.

  According to this configuration, the signal output means for outputting an abnormal image signal when it is determined that there is no output outputs the mark image signal when it is determined that there is an output. For this reason, the monitoring function of the monitoring target by the display device can be improved without complicating the configuration while ensuring the above-described effects.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, the same reference numerals are assigned to the same or equivalent parts in the drawings.

(First embodiment)
The night view monitor device 1 shown in FIG. 1 is based on an analog NTSC (National Television Standards Committee) signal Sa representing a night video (hereinafter referred to as video) captured by a near-infrared camera (hereinafter referred to as camera) 20. Display video. The night view monitor device 1 includes a camera 20, a night view ECU 2, and a display unit 10. The night view ECU 2 includes an A / D decoder 3, a video detection unit 4, a drawing unit 5, a memory 6, a video synthesis unit 7, A camera switch (S / W) 21 is provided.

  The A / D decoder 3 converts the analog NTSC signal Sa output from the camera 20 into a digital NTSC signal Sd and outputs the digital NTSC signal Sa. When the analog NTSC signal Sa is abnormal due to a failure or disconnection of the camera 20, the A / D decoder 3 The NTSC signal Sd is not output. For example, when the wiring between the camera 20 and the A / D decoder 3 is disconnected, the output from the A / D decoder 3 becomes zero.

  The case where the analog NTSC signal Sa is abnormal refers to a case where, for example, the RGB signal or the horizontal / vertical synchronization signal is abnormal among the analog NTSC signal Sa. The A / D decoder 3 determines whether or not the analog NTSC signal Sa is abnormal based on whether or not the 59.97 Hz vertical synchronization signal is normally input at this frequency. When determining that the analog NTSC signal Sa is normal, the A / D decoder 3 converts the analog NTSC signal Sa into a digital NTSC signal Sd and outputs the digital NTSC signal Sd.

  The video detection unit 4 determines whether or not the digital NTSC signal Sd is output from the A / D decoder 3 and outputs an output presence signal S3 when it is determined that there is an output, and when it determines that there is no output. Output no signal S4. The video detection unit 4 uses the function of the A / D decoder 3 that does not output the digital NTSC signal Sd when the analog NTSC signal Sa representing the video is abnormal, so that the analog NTSC signal Sa is normally output from the camera 20. Whether the digital NTSC signal Sd is output or not is determined.

  When the analog NTSC signal Sa is abnormal, that is, when the digital NTSC signal Sd is not output from the A / D decoder 3, the video detection unit 4 determines that the digital NTSC signal Sd is not output, and there is no output. The signal S4 is output to the drawing unit 5. When the analog NTSC signal Sa is normally output, that is, when the digital NTSC signal Sd is output from the A / D decoder 3, the video detection unit 4 determines that the digital NTSC signal Sd is output. The output presence signal S3 is output to the drawing unit 5.

  When outputting the output presence signal S3, the video detection unit 4 detects the monitoring target (human) 142 in the video 141 (see FIG. 2), and calculates the XY coordinates of the monitoring target (human) 142 in the video 141. . The video detection unit 4 outputs the coordinate signal Sr of this calculated value to the drawing unit 5.

  In addition, when the analog NTSC signal Sa from the camera 20 is abnormal, a blue background with a message such as “No video input” drawn on a blue background is not output from the A / D decoder 3. Is done.

  When the output presence signal S3 is input from the video detection unit 4, the drawing unit 5 receives the coordinate signal Sr from the video detection unit 4, and receives the mark image signal Sm of the mark image 143 indicating the monitoring target 142 in the video 141. Output based on the coordinate signal Sr. In FIG. 2, the mark image 143 is a frame image surrounding the person who is the monitoring target 142, and the drawing unit 5 displays the mark image signal so that the XY coordinates of the mark image 143 and the monitoring target 142 coincide in the video 141. Sm is generated based on the coordinate signal Sr.

  When the image output unit 4 receives the no-output signal S4 from the image detection unit 4, the drawing unit 5 outputs a black image signal Sb representing a black image indicating the absence of input. In FIG. 2, the black image is an image displayed instead of the video image 141 and is an image in which nothing of black is displayed.

  When the image output unit 4 receives the no-output signal S4, the drawing unit 5 causes the memory 6 to store information indicating that there is no input. For example, the accumulated travel distance of the vehicle on which the night view monitor device 1 is mounted and the determination that there is no input are stored in the memory 6 as a set. This stored information is analyzed by a dealer or the like, and is useful for repairing or exchanging a failed part. The memory 6 is a memory including a nonvolatile memory or a backup RAM (random access memory) that can electrically rewrite stored data.

  The drawing unit 5 determines the on / off state of the operation of the camera 20. When the operation of the camera 20 is turned on by operating the camera switch 21, the drawing unit 5 determines that the operation is on, and outputs an operation on signal S 1 to the video detection unit 4. When the camera switch 21 is operated and the operation of the camera 20 is turned off (stopped), the drawing unit 5 determines that the operation is off (operation stopped), and outputs an operation off signal S2 to the video detection unit 4. The video detection unit 4 does not determine whether or not the digital NTSC signal Sd is input when the operation-off signal S2 is input from the drawing unit 5. The drawing unit 5 also outputs the black image signal Sb when outputting the operation off signal S2 to the video detection unit 4.

When the output presence signal S3 is output from the video detection unit 4, the video synthesis unit 7 receives the digital NTSC signal Sd from the A / D decoder 3, receives the mark image signal Sm from the drawing unit 5, and receives the signal Sd. , Sm and the combined signal Sc is output to the display unit 10. When the output presence signal S3 is output from the image detection unit 4, the display unit 10 is based on the combined signal Sc and the video image 141 and the mark image 143. Is displayed on the liquid crystal panel 14. When the no-output signal S4 is output from the video detection unit 4 or when the operation off signal S2 is output from the drawing unit 5, the display unit 10 displays a black image on the liquid crystal panel 14 based on the black image signal Sb. To display.

  The night view monitor device 1 corresponds to the display device described in the claims, the camera 20 corresponds to the imaging means described in the claims, and the A / D decoder 3 corresponds to the video conversion means described in the claims. The video detection unit 4 corresponds to the determination unit described in the claims, and the drawing unit 5 corresponds to the signal output unit described in the claims. The memory 6 corresponds to storage means described in the claims, the video synthesis unit 7 corresponds to signal synthesis means described in the claims, and the display unit 10 corresponds to display means described in the claims. The analog NTSC signal Sa corresponds to the video signal recited in the claims, the digital NTSC signal Sd corresponds to the converted video signal recited in the claims, the black image corresponds to the abnormal image recited in the claims, The black image signal Sb corresponds to the abnormal image signal described in the claims.

  The display unit 10 includes a main MPU (main microprocessor unit, MMPU) 11, a sub MPU (SMPU) 12, a drawing IC (Integrated Circuit) 13, and a liquid crystal panel (LCD) 14. The drawing unit 5 is configured to be able to communicate with the main MPU 11 via the in-vehicle LAN 23, and the operation on / off signals S 1 and S 2 are input to the main MPU 11 through the in-vehicle LAN 23.

  The main MPU 11 receives the operation on / off signals S 1 and S 2 and transmits a command command for displaying an image on the liquid crystal panel 14 to the drawing IC 13 via the sub MPU 12. Upon receiving this command command, the drawing IC 13 controls the gate voltage of the thin film transistor (TFT) of the liquid crystal panel 14 based on the signals Sc and Sb input through the video line 22, and displays the superimposed image 140 or the black image on the liquid crystal panel. 14 is displayed.

  Specifically, when the main MPU 11 inputs the operation off signal S2 and when the main MPU 11 inputs the operation on signal S1 and the no output signal S4 is output from the video detection unit 4, a black image is displayed. Displayed on the liquid crystal panel 14. On the other hand, when the main MPU 11 receives the operation on signal S1 and the output presence signal S3 is output from the video detection unit 4, the superimposed video 140 is displayed on the liquid crystal panel 14.

  Below, the action | operation and effect by the above-mentioned structure are demonstrated based on FIG.

  In step P <b> 1, the drawing unit 5 determines the on / off state of the operation of the camera 20 when the camera switch 21 is on / off. The drawing unit 5 outputs an operation on signal S1 to the image detection unit 4 when it is determined as an operation on state, and outputs an operation off signal S2 to the image detection unit 4 when it is determined as an operation off state.

  If YES in step P1, that is, if the drawing unit 5 determines that the camera 20 is activated and outputs the operation on signal S1 to the video detection unit 4, the process proceeds to step P2. In step P2, the video detection unit 4 determines whether the digital NTSC signal Sd is output from the A / D decoder 3, and determines whether the analog NTSC signal Sa is abnormal. In step P2, when it is determined YES and the analog NTSC signal Sa is determined to be abnormal, the video detection unit 4 determines that the digital NTSC signal Sd is not output, and outputs the no-output signal S4 to the drawing unit 5. Output to. In step P2, when it is determined NO and it is determined that the analog NTSC signal Sa is normal, the video detection unit 4 determines that the digital NTSC signal Sd is output, and outputs the output presence signal S3 to the drawing unit 5. Output to.

  If YES is determined in step P2, that is, if the video detection unit 4 determines that the digital NTSC signal Sd is not output and outputs the no-output signal S4 to the drawing unit 5, the process proceeds to step P3. In step P3, a black screen is displayed on the liquid crystal panel 14 to display an abnormality, and the information of the no-output signal S4 is stored in the memory 6 to store the camera abnormality. If NO is determined in step P2, that is, if the video detection unit 4 determines that the digital NTSC signal Sd is output and outputs the output presence signal S3 to the drawing unit 5, the process proceeds to step P4. In step P4, the superimposed image 140 is displayed on the liquid crystal panel 14 to perform normal display.

When it is determined NO in Step P1, that is, when the drawing unit 5 determines that the switch 21 is not turned on and the camera 20 is turned off and outputs the operation off signal S2 to the video detection unit 4, the process goes to Step P5. move on. In step P5, the video detection unit 4 does not determine whether or not the digital NTSC signal Sd is output from the A / D decoder 3. That is, only when it is determined in step P1 that the drawing unit 5 is in an operation-on state, in step P2, the video detection unit 4 determines whether the analog NTSC signal Sa is normal or abnormal. Since the A / D decoder 3 does not output both the black image signal Sb and the digital NTSC signal Sd when the analog NTSC signal Sa is abnormal, the video detection unit 4 determines that the digital NTSC signal Sd is not output. Thus, the video detection unit 4 can determine whether the analog NTSC signal Sa is abnormal. Therefore, it is possible to store in the memory 6 information regarding the absence of output, that is, information regarding abnormality determination of the analog NTSC signal Sa.

  Further, in this configuration, when it is determined that there is no output, the drawing unit 5 outputs the black image signal Sb instead of the A / D decoder 3, and the liquid crystal panel 14 displays a black image based on the black image signal Sb. . For this reason, when the analog NTSC signal Sa is determined to be abnormal by the video detection unit 4, a black image representing this can be displayed when the analog NTSC signal Sa is abnormal.

  Furthermore, according to this configuration, when the camera 20 is in operation, the video detection unit 4 determines whether or not the digital NTSC signal Sd from the A / D decoder 3 is output. This information is not stored in error when turned off. Therefore, when the analog NTSC signal Sa from the camera 20 is abnormal, this information is stored in the night view monitor device 1 that displays a black image representing the analog NTSC signal Sa. Can be stored in error.

  Furthermore, according to this configuration, the drawing unit 5 that outputs the black image signal Sb when it is determined that there is no output determines whether or not the camera 20 is operating. The effect of can be obtained.

  Further, according to this configuration, the drawing unit 5 that outputs the black image signal Sb when it is determined that there is no output outputs the mark image signal Sm when it is determined that there is an output. For this reason, the monitoring function of the monitoring object 142 by the night view monitor apparatus 1 can be improved without complicating the configuration while ensuring the above-described effects.

(Second Embodiment)
In the second embodiment, as shown in FIG. 4, the main MPU (main microprocessor unit, MMPU) 11 </ b> A includes a rotation sensor 31 that detects the engine speed of the host vehicle, in addition to the drawing unit 5, A speed sensor 32 that detects the speed, a water temperature sensor 33 that detects the temperature of the engine coolant of the host vehicle, a fuel sensor 34 that detects the remaining fuel level of the host vehicle, and a multiplex communication via the in-vehicle LAN 23A. Is done.

  When the main MPU 11A receives the operation-off signal S2 from the drawing unit 5 via the in-vehicle LAN 23A, the main MPU 11A inputs the signals of the sensors 31 to 34 through multiplex communication via the in-vehicle LAN 23A, and based on these, the liquid crystal panel 14A The contents to be displayed on the sub MPU 12 are transmitted to the sub MPU 12 as a command command. The sub MPU 12 transmits a drawing signal to the drawing IC 13 in accordance with this command, and the drawing IC 13 controls the gate voltage of the TFT based on the drawing signal, and the rotation meter image 144, the speed meter image 145, the water temperature shown in FIG. The meter image 146 and the fuel meter image 147 are displayed on the liquid crystal panel 14A. Each pointer image representing each pointer of the rotation meter image 144, the speed meter image 145, the water temperature meter image 146, and the fuel meter image 147 is rotated based on the signals of the sensors 31 to 34, respectively. Meter images 144-147 are controlled.

  When the main MPU 11A receives the operation on signal S1, the main MPU 11A sends a command command for displaying a video instead of the speedometer image 145 to the display IC 148 via the sub MPU 12 in the display area 148 (FIG. 6) of the liquid crystal panel 14A. Send. Upon receiving this command command, the drawing IC 13 controls the gate voltage of the TFT based on the signals Sc and Sb input through the video line 22 to display the superimposed video 140 or the black image on the display area 148 of the liquid crystal panel 14A. .

  Specifically, when the main MPU 11 receives the operation on signal S1 and the no output signal S4 is output from the video detection unit 4, a black image is displayed in the display area 148 of the liquid crystal panel 14A. When the main MPU 11 receives the operation ON signal S1 and the output presence signal S3 is output from the image detection unit 4, the superimposed image 140 is displayed in the display area 148 of the liquid crystal panel 14A as shown in FIG. Is done. On the other hand, when the main MPU 11 inputs the operation off signal S2, as shown in FIG. 5, the speedometer image 145 is displayed in the display area 148 of the liquid crystal panel 14A.

  The night view monitor device 1A corresponds to the display device described in the claims, and the display unit 10A corresponds to the display means described in the claims.

  Also in this embodiment, the same effect as that of the first embodiment can be obtained.

It is a circuit block diagram of the night view monitor apparatus by 1st Embodiment of this invention. It is a front view which shows the example of a display of the liquid crystal panel shown in FIG. It is a flowchart explaining the action | operation of the night view monitor apparatus shown in FIG. It is a circuit block diagram of the night view monitor apparatus by 2nd Embodiment of this invention. FIG. 5 is a front view showing a display example of the liquid crystal panel shown in FIG. 4 when the camera switch is off. FIG. 5 is a front view showing a display example of the liquid crystal panel shown in FIG. 4 when the camera switch is turned on.

Explanation of symbols

1,1A Night View Monitor Device (Display Device), 2 Night View ECU
3 A / D coder (video conversion means), 4 video detector (determination means)
5 drawing section (signal output means), 6 memory (storage means), 7 video composition section (signal synthesis means)
10, 10A display unit (display means), 11, 11A main MPU (MMPU)
12 sub-MPU (SMPU), 13 drawing IC, 14, 14A liquid crystal panel (LCD)
140 Superimposed video, 141 video, 142 Monitoring target, 143 Mark image 144 Rotation meter image, 145 Speed meter image, 146 Water temperature meter image 147 Fuel meter image, 148 Display area 20 Near infrared camera (camera, imaging means), 21 Camera switch (S / W)
22 Video line, 23, 23A In-vehicle LAN, 31 Rotation sensor, 32 Speed sensor 33 Water temperature sensor, 34 Fuel sensor, S1 Operation on signal, S2 Operation off signal S3 Output signal, S4 No output signal Sa Analog NTSC signal (Video signal) ), Sd Digital NTSC signal (converted video signal)
Sb Black image signal (abnormal image signal), Sc composite signal, Sm mark image signal Sr coordinate signal

Claims (3)

Imaging means for outputting a video signal representing the video being shot;
Converting the video signal into a converted video signal, determining whether or not the video signal is abnormal, and outputting an abnormal image signal of an abnormal image representing the abnormality and the converted video signal when the video signal is abnormal Video conversion means for prohibiting output and outputting the converted video signal when the video signal is normal;
Determining means for determining whether or not the converted video signal is output from the video converting means when the imaging means is operating;
When the determination unit determines that there is no output, a storage unit that stores information on the determination that there is no output;
When the output no determination is made, signal output means for outputting the abnormal image signal;
The abnormal image signal is input from the signal output unit to display the abnormal image, and the display unit receives the converted video signal from the video conversion unit to display the video. Display device.   The display device according to claim 1, wherein the signal output unit determines whether or not the imaging unit is operating. The signal output means outputs a mark image signal of a mark image indicating a monitoring target in the video when the determination means makes an output determination,
In the case of the determination that there is an output, the signal processing unit includes a signal combining unit that combines the converted video signal and the mark image signal and outputs a combined signal to the display unit.
3. The display device according to claim 1, wherein the display unit displays a superimposed video in which the video and the mark image are superimposed based on the composite signal when the output is determined.

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