JP2008187687A - Camera system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a camera system capable of transmitting outputs of a plurality of cameras with less wirings. <P>SOLUTION: The camera system has the plurality of cameras 10, 20, and 30, synchronously outputs images captured by the plurality of cameras 10, 20, and 30 to a wire harness 80, and puts the images output from those cameras 10, 20, and 30 together on the wire harness 80. Consequently, the one wire harness 80 can transmit the composite image of the plurality of images to the side of a monitor 90. Image data can be transmitted with less wirings. Further, a digital signal representing one pixel is continuously output only for the front half thereof and an output terminal is placed in a high impedance state for the second half part. Consequently, there is not a collision between signals as a new signal is input to a transmission line, and then characteristic deterioration and breakage of a drive element can be evaded. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a camera system that combines and transmits images output from a plurality of cameras.

2. Description of the Related Art Conventionally, as an apparatus for synthesizing a plurality of images, an image synthesizing apparatus that takes in pixel data output from a plurality of cameras into a pixel data acquisition unit and adjusts the arrangement of the pixel data to generate a synthesized image is known. (For example, refer to Patent Document 1). This apparatus records a signal output from a camera as pixel data and generates a composite image based on the pixel data, thereby generating a composite image without using a large-capacity memory.
JP 2006-140908 A

  In such an apparatus, output wiring is connected to each camera, and pixel data output from the camera through these wirings is input to the pixel data acquisition means. Therefore, it is necessary to connect a plurality of wirings connected to each camera to the pixel data acquisition unit. In this case, if the number of cameras installed is large, the number of wires increases accordingly. Further, it is necessary to provide a plurality of wiring connection connectors in the pixel data acquisition means.

  SUMMARY An advantage of some aspects of the invention is that it provides a camera system that can transmit outputs from a plurality of cameras with less wiring.

  That is, the camera system according to the present invention includes a plurality of cameras having an imaging unit and a captured image captured by the imaging unit so that display ranges of images output from the plurality of cameras do not overlap during image synthesis. An image deformation means for deforming the image, an output control means for synchronizing and outputting the images captured by the plurality of cameras, and determining a position of a display range after the combination of the captured images at a synchronization timing; A wiring member for connecting a camera and a monitor, combining images output from the plurality of cameras and transmitting the images to the monitor, and the output control means outputs an image composed of a digital image signal from an output terminal In the period in which a signal indicating one pixel is output from the digital image signal, the second half of the period is more than the first half of the period. To set a high impedance of the serial output terminal, configured as characterized.

  According to the present invention, by synchronizing the images captured by the plurality of cameras and outputting them to the wiring member, it is possible to synthesize the images captured by the plurality of cameras on the wiring member. Therefore, a composite image obtained by combining a plurality of images with one wiring member can be transmitted to the monitor side, and an image can be transmitted with a small number of wiring members. Moreover, since the number of wiring members installed can be reduced, the number of wiring member connection connectors in the monitor can be reduced accordingly. Furthermore, since the image data transmitted by the wiring member can be reduced as compared with the case of transmitting a plurality of image data, data transfer can be performed reliably.

  Further, when a plurality of images are combined on a cable, two output control means may or may not output signals corresponding to the two images at the same time due to a slight shift in output timing of the output control means. There is a fear. According to the present invention, there is provided means for changing the impedance of the digital signal to be output, and in the signal corresponding to one pixel, each pixel is set by setting the impedance of the output terminal higher in the latter half than in the first half. A high impedance state can be formed between them. Thereby, when the display range is switched between certain pixels, that is, when the output control means is switched, the output terminal is in a high impedance state, so that it is possible to avoid signal collision on the transmission path. Therefore, it is possible to avoid an increase in power consumption and deterioration or damage of the drive element characteristics. Furthermore, since noise due to unintended signals can be prevented, image quality deterioration of a display image can be prevented.

  Here, in the camera system according to the present invention, the output control means is configured to output a signal indicating the last pixel before switching the display range in the second half of the period rather than the first half of the period. It is preferable to perform the process of setting the impedance of the output terminal higher. As a result, it is possible to efficiently avoid the characteristic deterioration and breakage of the drive element and to prevent the image quality deterioration of the display image as compared with the case where the high impedance state is formed between all the pixels.

  According to the present invention, images output from a plurality of cameras can be transmitted to a monitor with less wiring, and the number of wirings can be reduced. Further, collision of signals on the transmission path can be avoided, so that damage to the drive element can be prevented and image quality deterioration can be prevented.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted.

(First embodiment)
FIG. 1 is a schematic configuration diagram of a camera system according to the first embodiment of the present invention.

  As shown in FIG. 1, a camera system 1 according to this embodiment is applied to a camera system mounted on a vehicle 2 and includes a plurality of cameras 10, 20, and 30 that capture an image of the periphery of the vehicle 2. ing. The cameras 10, 20 and 30 are imagers that image different areas. For example, the camera 10 is installed so as to capture an area on the left side of the vehicle 2. The camera 20 is installed so as to capture an area on the front left side of the vehicle 2. The camera 30 is installed so as to capture an area on the right front side of the vehicle 2.

  The cameras 10 to 30 are preferably operated in synchronization with each other, but there is no problem in synthesizing images even if they are not operated in synchronization. Further, the resolutions of the cameras 10 to 30 may not be unified.

  A monitor 90 is installed in the vehicle 2. The monitor 90 is a display that displays images output from the cameras 10, 20, and 30. The monitor 90 is installed in the vicinity of the driver's seat of the vehicle 2, for example. The monitor 90 is preferably shared with a monitor used in a car navigation system. In this case, it is preferable to provide a display changeover switch or button of the monitor 90. By switching the display changeover switch or pressing the display changeover button, it is possible to switch between the car navigation display and the captured image display around the vehicle. The monitor 90 may have a resolution that does not match the resolution of the cameras 10 to 30.

  The cameras 10, 20 and 30 and the monitor 90 are connected by a single wire harness 80. The wire harness 80 is a wiring member that synthesizes images output from the cameras 10, 20, and 30 and transmits them to the monitor 90. For example, the wire harness 80 is configured by bundling and covering 10 signal lines. For example, it is used for parallel communication.

  The wire harness 80 includes an input end 81 connected to the camera 10, an input end 82 connected to the camera 20, an input end 83 connected to the camera 30, and an output end 89 connected to the monitor 90. The input ends 81, 82, 83, and the output end 89 are electrically connected to each other. Therefore, the signals input to the input terminals 81, 82 and 83 are superimposed and output from the output terminal 89. For example, each digital image signal input to the input terminals 81, 82, and 83 is superimposed on the wire harness 80 to become one synthesized digital image signal, and is transmitted to the output terminal 89.

  FIG. 2 is an explanatory diagram of the camera configuration of the camera system according to the present embodiment.

  As shown in FIG. 2, the camera 10 includes an imaging unit 11, an image deformation unit 12, and an output control unit 13. The camera 20 includes an image capturing unit 21, an image deforming unit 22, and an output control unit 23, and the camera 30 includes an image capturing unit 31, an image deforming unit 32, and an output control unit 33. As the imaging units 11, 21, and 31, those having the same configuration and function are used. As the image deforming units 12, 22 and 32, those having the same configuration and function are used. Further, the output controllers 13, 23, and 33 have the same configuration and function. Hereinafter, as a representative, the configuration, function, and the like of the imaging unit 11, the image deformation unit 12, and the output control unit 13 will be described in detail.

  The imaging unit 11 functions as an imaging unit in the camera 10 and includes, for example, an imaging device such as a C-MOS (Complementary Metal Oxide Semiconductor) or a CCD (Charged Coupled Device) as a main component. An image deformation unit 12 is connected to the output side of the imaging unit 11. An image captured by the imaging unit 11 is input to the image deformation unit 12.

  The image deforming unit 12 functions as an image deforming unit that deforms a captured image captured by the image capturing unit 11, and includes, for example, an image processing IC as a main component. In the image deforming unit 12, for example, image reduction, trimming, parallel movement, and the like are performed. An output control unit 13 is connected to the output side of the image deformation unit 12. The image deforming unit 12 deforms the captured image so that the display area of the captured image captured by the imaging unit 11 does not overlap the display area of the image output from the other cameras 20 and 30.

  For example, the display areas of the deformed images are set in advance in the image deforming units 12, 22, and 32 so that the display areas of the images output from the cameras 10, 20, and 30 do not overlap in one image display range. As a result, image deformation processing such as image enlargement / reduction, aspect ratio change, image rotation, and parallel movement is performed so that the captured images captured by the imaging units 11, 21, and 31 fall within the set display area. Applied.

The output control unit 13 functions as an output control unit that outputs the image captured by the camera 10 to the wire harness 80 in synchronization with the image output of the other cameras 20 and 30. That is, the output control units 13, 23, and 33 simultaneously output images captured at the same time to the wire harness 80 as digital image signals in synchronization. At that time, the image output in the cameras 10, 20 and 30 may be synchronized at the timing of outputting one pixel calculated from the synchronization signal, that is, the timing based on the pixel clock. For example, a pixel clock is generated from a horizontal synchronization signal output from one of the cameras 10, 20, and 30, and image signals of the cameras 10, 20, and 30 are sequentially output based on the pixel clock, and the image signals are A composite image signal is generated at a timing so as not to overlap.
The output control unit 13 has a function of controlling the impedance of the output terminal. Hereinafter, the impedance control of the output control unit 13 will be described with reference to FIG. FIG. 3 is an explanatory diagram of the configuration of the output control unit 13.
As illustrated in FIG. 3, the output control unit 13 includes, for example, transistors Tr ₁ and Tr ₂ . The transistors Tr ₁ and Tr ₂ are connected in series, for example, and the digital signal state is controlled by a combination of ON and OFF of the transistors Tr ₁ and Tr ₂ . Here, by turning off both of the transistors Tr ₁ and Tr ₂ , the output terminal can be brought into a high impedance state.

  Next, the operation of the camera system according to the present embodiment will be described.

  In FIG. 2, first, an area around the vehicle is imaged by the imaging unit 11 of the camera 10, the imaging unit 21 of the camera 20, and the imaging unit 31 of the camera 30. In FIG. 2, an image A21 captured by the imaging unit 11 is illustrated as “ABC”, an image A22 captured by the imaging unit 21 is “left”, and an image A23 captured by the imaging unit 31 is illustrated as “right”.

  The image A21 captured by the imaging unit 11 is transformed into a transformed image B21 by the image transforming unit 12. The image A22 captured by the image capturing unit 21 is deformed into a deformed image B22 by the image deforming unit 22, and the image A23 captured by the image capturing unit 31 is deformed into the deformed image B23 by the image deforming unit 32.

  The deformed images B21, B22, and B23 are deformed so as not to overlap each other in one image display range. For example, the deformed image B21 is rotated 90 degrees to the right, reduced, and arranged at the left position of the image display range. The deformed image B22 is reduced and arranged at the center position of the image display range. The deformed image B23 is reduced and arranged at the right position of the image display range.

  The modified image B21 is input to the output control unit 13, the modified image B22 is input to the output control unit 23, and the modified image B23 is input to the output control unit 33. The deformed images B21, B22, and B23 are output as digital signals to the wire harness 80 in a state of being synchronized by the output control units 13, 23, and 33.

  For example, the output timings of the output control units 13, 23 and 33 are set based on the synchronization signal output from the output control unit 13 of the camera 10, and the modified control images B21, B22 and B23 are output from the output control units 13, 23 and 33. The components are output sequentially.

  Thereby, digital image signals of images captured by the cameras 10, 20, and 30 on the wire harness 80 are superimposed, and images captured by the cameras 10, 20, and 30 on the wire harness 80 are combined. . C in FIG. 2 is an image diagram of a composite image. At this time, when outputting the image components of the modified images B21, B22, and B23, the output control units 13, 23, and 33 output the latter half of the first half of the period in which the digital signal indicating one pixel is output. Set the terminal impedance high.

  Here, the impedance setting method of the output terminal will be described in detail with reference to the drawings. FIG. 4 is an example of a composite image signal in the camera system according to the present embodiment.

  The composite image signal Sf shown in FIG. 4 is a digital signal of a composite image obtained by combining the images output from the cameras 10 to 30, and is transmitted through, for example, eight transmission paths that transmit image signals. The composite image signal Sf indicates a signal for one field, and the horizontal axis indicates time and the vertical axis indicates voltage level. The signal Sv is a vertical synchronization signal, and is a synchronization signal for aligning the vertical direction of the image displayed on the monitor 90. The signal Sh is a horizontal synchronization signal and is a synchronization signal for aligning the left and right directions of the image displayed on the monitor 90. These synchronization signals Sv and Sh are transmitted through a transmission path different from the synthesized image signal Sf.

  In this composite image signal Sf, digital image signal portions S2 are successively connected by the number of scanning lines. In the image signal section S2, a first image signal component S21, a second image signal component S22, and a third image signal component S23 are sequentially connected.

  The first image signal component S21 is formed by superimposing the image signal output from the camera 10. The second image signal component S22 is obtained by superimposing the image signal output from the camera 20. The third image signal component S23 is obtained by superimposing the image signal output from the camera 30.

  For the superimposition of the first image signal component S21, the second image signal component S22, and the third image signal component S23, for example, a pixel clock is calculated on the basis of the horizontal synchronization signal S11, and the camera 10, 20, and 30 is synchronized with each other. This is done by sequentially outputting image signals.

  The first image signal component S21, the second image signal component S22, and the third image signal component S23 are each formed by superimposing digital signals indicating one pixel. For example, the second image signal component S22 is obtained by superimposing the second image pixel signal S221. The second image pixel signal S221 is composed of 8 bits and can display 256 gradations. The second image pixel signal S221 is output for about 80 ns, for example.

Since such an image signal is once output to the transmission path, it stays on the transmission path, so that a predetermined time is required until it attenuates and disappears. Focusing on this point, in the second image pixel signal S221 which is the total period of l ₁ and l ₂ outputs, without signal output continuously total duration of l ₁ and l _2, only the period of the first half l ₁ signal It is assumed that the signal value output during the period of the remaining second half portion l ₂ is the signal value output and retained during the period of the first half portion l ₁ . Specifically, if the signal of the second image pixel signal S221 is continuously output for a total of 80 ns, for example, the signal of the second image pixel S221 is continuously output until 40 ns have passed, and the remaining 40 ns is a signal that is output and stays during the first 40 ns. As a result, it is not necessary to output a signal in the period of the remaining second half l ₂ , so that the output terminal can be in a high impedance state and no signal can be output.

  Thus, when the output terminal is in a high impedance state, when the display screen is switched, a slight synchronization shift occurs in the output control unit, and the subsequent signal is input in the transmission path. Even when a signal is input, since the output terminal is kept in a high impedance state, signal collision on the transmission path can be avoided.

  Returning to FIG. 2, the synthesized image signal is output to the monitor 90, and the synthesized image is displayed on the monitor 90 in accordance with the synthesized image signal input to the monitor 90. The driver of the vehicle can grasp the situation around the vehicle by looking at the display on the monitor 90. Note that the scanning method in image formation may be interlaced scanning or sequential scanning.

  As described above, the composite digital image signal is transmitted by the wire harness 80 and input to the monitor 90. At this time, since the images picked up by the plurality of cameras 10 to 30 are combined into one composite image, the image information of the plurality of picked-up images can be input to the monitor 90 through one image signal line. For this reason, the number of connectors for wiring connection in the monitor 90 can be reduced. When the monitor 90 is shared with a car navigation monitor, the number of connectors that can be installed on the monitor 90 is limited, which is particularly useful. Furthermore, even when the number of cameras is increased, it is not necessary to increase the number of connectors of the monitor 90, so that the number of cameras can be easily increased. In addition, the same monitor 90 can be shared in camera systems having different camera installation numbers.

  Further, since the amount of data for one image is sufficient for the composite image signal transmitted by the wire harness 80, there is no need to increase the transfer amount of the image data, and there is no problem such as frame dropping due to an increase in the transfer amount. .

Also within the signal S221 corresponding to one pixel, the period of the latter half portion l _2, by setting a high impedance of the output terminal, it is possible to output terminal and a high impedance in each pixel S221 transmission. Thereby, when the display range is switched between certain pixels, that is, when the output control unit is switched, collision of signals on the transmission path can be avoided even when a new signal is input. Therefore, it is possible to avoid an increase in power consumption and deterioration or damage of the drive element characteristics. Furthermore, since noise due to unintended signals can be prevented, image quality deterioration of a display image can be prevented.

  Further, by combining the images captured by the plurality of cameras 10-30 on the wire harness 80, it is not necessary to record the images captured by the plurality of cameras 10-30 in the memory. For this reason, it is not necessary to install a large capacity memory. Further, since the recording process of the image data in the memory is not required, the image composition process can be performed quickly.

(Second embodiment)
Next, a camera system according to a second embodiment of the present invention will be described.

  The camera system which concerns on 2nd embodiment is comprised similarly to the camera system 1 which concerns on 1st embodiment shown in FIG. 1, and the timing which makes it a high impedance state differs. Therefore, constituent elements are denoted by the same reference numerals as those in the first embodiment, and the description thereof will be omitted. Hereinafter, timing for setting the camera system according to the second embodiment in a high impedance state will be described with reference to FIG.

  FIG. 5 is an example of a composite image signal in the camera system according to the present embodiment. The synthesized image signal Sf shown in FIG. 5 is a digital signal of a synthesized image obtained by synthesizing images output from the cameras 10 to 30, and is transmitted through, for example, eight transmission paths that send image signals. The composite image signal Sf indicates a signal for one field, and the horizontal axis indicates time and the vertical axis indicates voltage level. The signal Sv is a vertical synchronization signal, and is a synchronization signal for aligning the vertical direction of the image displayed on the monitor 90. The signal Sh is a horizontal synchronization signal and is a synchronization signal for aligning the left and right directions of the image displayed on the monitor 90. These synchronization signals Sv and Sh are transmitted through a transmission path different from the synthesized image signal Sf.

  In this composite image signal Sf, digital image signal portions S2 are successively connected by the number of scanning lines. In the image signal section S2, a first image signal component S21, a second image signal component S22, and a third image signal component S23 are sequentially connected.

  The first image signal component S21 is formed by superimposing the image signal output from the camera 10. The second image signal component S22 is obtained by superimposing the image signal output from the camera 20. The third image signal component S23 is obtained by superimposing the image signal output from the camera 30.

  For the superimposition of the first image signal component S21, the second image signal component S22, and the third image signal component S23, for example, a pixel clock is calculated on the basis of the horizontal synchronization signal S11, and the camera 10, 20, and 30 is synchronized with each other. This is done by sequentially outputting image signals.

  The first image signal component S21, the second image signal component S22, and the third image signal component S23 are each formed by superimposing digital signals indicating one pixel. For example, the second image signal component S22 is made by superimposing the second image pixel signal S221, and the third image signal component S23 is made by superimposing the third image pixel signal S231. The image pixel signals S221 and S231 are composed of 8 bits and can display 256 gradations. Further, the image pixel signals S221 and S231 are output for about 80 ns, for example.

Since such an image signal is once output to the transmission path, it stays on the transmission path, so that a predetermined time is required until it attenuates and disappears. Focusing on this point, the first half portion is not output continuously at the point where the display range is switched, that is, between the second image signal component S22 and the third image signal component S23, without continuously outputting the signal of the pixel S221 ′ immediately before switching. only output period, the period of the latter half portion l ₂ performs control to output signal remaining in the transmission path and outputs the first half. Thereby, since the period of the remaining second half l ₂ there is no need to output a second image signal component S22, possible output state which does not output a signal in the high impedance state.

  In this way, when the output terminal is in a high impedance state, when the display screen is switched, in the state where the previous signal is input in the transmission path, a slight synchronization shift occurs in the output control unit, It is possible to prevent simultaneous input of signals. Thereby, collision of signals on the transmission path can be avoided.

  As described above, the synthesized digital image signal can input image information of a plurality of captured images to the monitor 90 through one image signal line. For this reason, the number of connectors for wiring connection in the monitor 90 can be reduced. When the monitor 90 is shared with a car navigation monitor, the number of connectors that can be installed on the monitor 90 is limited, which is particularly useful. Furthermore, even when the number of cameras is increased, it is not necessary to increase the number of connectors of the monitor 90, so that the number of cameras can be easily increased. In addition, the same monitor 90 can be shared in camera systems having different camera installation numbers.

  Further, since the amount of data for one image is sufficient for the composite image signal transmitted by the wire harness 80, there is no need to increase the transfer amount of the image data, and there is no problem such as frame dropping due to an increase in the transfer amount. .

Further, with respect to the signal S221' indicating switching before the last 1 pixel of the display range, during the latter portion l _2, by performing the process of setting a high impedance of the output terminal, a second image signal component S22 the A high impedance state can be formed at a location where the three image signal components S23 are in contact. As a result, when the display range is switched, that is, when the output control unit is switched, a new signal is not input, so that collision of signals on the transmission path can be avoided. Therefore, it is possible to avoid an increase in power consumption and deterioration or damage of the drive element characteristics. Furthermore, since noise due to unintended signals can be prevented, image quality deterioration of a display image can be prevented.

  Further, by combining the images captured by the plurality of cameras 10-30 on the wire harness 80, it is not necessary to record the images captured by the plurality of cameras 10-30 in the memory. For this reason, it is not necessary to install a large capacity memory. Further, since the recording process of the image data in the memory is not required, the image composition process can be performed quickly.

(Third embodiment)
Next, a camera system according to a third embodiment of the present invention will be described.

  The camera system according to the third embodiment is configured in the same manner as the camera system 1 according to the first embodiment shown in FIG. Therefore, the constituent elements are denoted by the same reference numerals as those in the first embodiment, and the description thereof is omitted. Hereinafter, the timing for setting the high impedance state of the camera system according to the third embodiment will be described with reference to FIG.

  FIG. 6 is an example of a composite image signal in the camera system according to the present embodiment. The synthesized image signal Sf shown in FIG. 6 is a digital signal of a synthesized image obtained by synthesizing images output from the cameras 10 to 30, and is transmitted through, for example, eight transmission paths that send image signals. The composite image signal Sf indicates a signal for one field, and the horizontal axis indicates time and the vertical axis indicates voltage level. The signal Sv is a vertical synchronization signal, and is a synchronization signal for aligning the vertical direction of the image displayed on the monitor 90. The signal Sh is a horizontal synchronization signal and is a synchronization signal for aligning the left and right directions of the image displayed on the monitor 90. These synchronization signals Sv and Sh are transmitted through a transmission path different from the synthesized image signal Sf.

  In this composite image signal Sf, digital image signal portions S2 are successively connected by the number of scanning lines. In the image signal section S2, a first image signal component S21, a second image signal component S22, and a third image signal component S23 are sequentially connected.

  The first image signal component S21 is formed by superimposing the image signal output from the camera 10. The second image signal component S22 is obtained by superimposing the image signal output from the camera 20. The third image signal component S23 is obtained by superimposing the image signal output from the camera 30.

  For the superimposition of the first image signal component S21, the second image signal component S22, and the third image signal component S23, for example, a pixel clock is calculated on the basis of the horizontal synchronization signal S11, and the camera 10, 20, and 30 is synchronized with each other. This is done by sequentially outputting image signals.

In this case, after outputting the first image signal component S21, while indicated by l _2, it is a state that does not output a signal to the output terminal in a high impedance state. Thereafter, the second image signal component S22 is output, while the similarly indicated by l _2, after the output terminal in a high impedance state, the third image signal component S23 is output.

  In this way, when the display screen is switched, the output terminal is in a high impedance state, so that signal collision on the transmission path can be avoided.

  As described above, the synthesized digital image signal can input image information of a plurality of captured images to the monitor 90 through one image signal line. For this reason, the number of connectors for wiring connection in the monitor 90 can be reduced. When the monitor 90 is shared with a car navigation monitor, the number of connectors that can be installed on the monitor 90 is limited, which is particularly useful. Furthermore, even when the number of cameras is increased, it is not necessary to increase the number of connectors of the monitor 90, so that the number of cameras can be easily increased. In addition, the same monitor 90 can be shared in camera systems having different camera installation numbers.

  Further, since the amount of data for one image is sufficient for the composite image signal transmitted by the wire harness 80, there is no need to increase the transfer amount of the image data, and there is no problem such as frame dropping due to an increase in the transfer amount. .

The switching point of the display range, i.e., between l ₂ of the first image signal component S21 and between l _2, and the second image signal component S22 of the second image signal component S22 and the third image signal component _S23, the output Since the terminals are in a high impedance state, collision of signals on the transmission path can be avoided. Therefore, it is possible to avoid an increase in power consumption and deterioration or damage of the drive element characteristics. Furthermore, since noise due to unintended signals can be prevented, image quality deterioration of a display image can be prevented.

  Further, by combining the images captured by the plurality of cameras 10-30 on the wire harness 80, it is not necessary to record the images captured by the plurality of cameras 10-30 in the memory. For this reason, it is not necessary to install a large capacity memory. Further, since the recording process of the image data in the memory is not required, the image composition process can be performed quickly.

  Each embodiment described above shows an example of a camera system according to the present invention. The camera system according to the present invention is not limited to the above, and the camera system according to each embodiment is modified or applied to another so as not to change the gist described in each claim. It may be.

  For example, in the embodiment, the camera system mounted on the vehicle 2 has been described. However, the camera system may be installed on something other than the vehicle. Further, the number of cameras described in this embodiment is not limited.

1 is a schematic configuration diagram of a camera system according to a first embodiment of the present invention. It is explanatory drawing of the structure of the camera in the camera system of FIG. It is explanatory drawing of a structure of the output control part in the camera system of FIG. It is explanatory drawing of the synthesized image signal of the camera system of FIG. It is explanatory drawing of the synthesized image signal of the camera system which concerns on 2nd embodiment of this invention. It is explanatory drawing of the synthesized image signal of the camera system which concerns on 3rd embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Camera system, 2 ... Vehicle, 10 ... Camera, 11 ... Imaging part, 12 ... Image deformation part, 13 ... Output control part, 20 ... Camera, 21 ... Imaging part, 22 ... Image deformation part, 23 ... Output control part , 30 ... camera, 31 ... imaging unit, 32 ... image deformation unit, 33 ... output control unit, 80 ... wire harness, 90 ... monitor.

Claims (2)

A plurality of cameras having an imaging unit;
Image deformation means for deforming a captured image captured by the imaging unit so that display ranges of images output from the plurality of cameras do not overlap during image synthesis;
Output control means for synchronizing and outputting images captured by the plurality of cameras, and determining a position of a display range after combining the captured images at a synchronization timing;
A wiring member for connecting the plurality of cameras and the monitor, combining the images output from the plurality of cameras and transmitting the images to the monitor;
With
The output control means is a means for outputting an image composed of a digital image signal from an output terminal, and in a period in which a signal indicating one pixel of the digital image signal is output, the period is more than the first half of the period. The latter part of the is to set the impedance of the output terminal higher,
A camera system characterized by The output control means sets the impedance of the output terminal higher in the second half of the period than in the first half of the period in a period in which a signal indicating the last pixel before the display range is switched is output. Processing,
The camera system according to claim 1.

Images