JP2015154406A - Peripheral monitoring device for towing vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To monitor periphery of a towing vehicle and a towed vehicle and display peripheral state in an easy to understand manner.SOLUTION: When a connection detection part 22a detects that a towing vehicle 10 is connected to a towed vehicle 30, an image conversion part 16b converts images that are imaged with imaging parts 12a, 12b, 12c, 12d around the towing vehicle 10 to a plurality of first overlooking images which overlook the towing vehicle 10, and converts images imaged with imaging parts 32a, 32b, 32c around the towed vehicle 30 to a plurality of second overlooking images which overlook the towed vehicle 30. An image compositing part 16c, based on a posture of the towed vehicle 30 relative to the towing vehicle 10, composites the plurality of first overlooking images with the plurality of second overlooking images to generate a third composite image, which is displayed on an image display part 26a.

Description

  The present invention relates to a tow vehicle and a tow vehicle surrounding monitoring device that is mounted on a tow vehicle to be towed by a tow vehicle and images a surrounding situation of the vehicle and presents it to a driver.

  In recent years, a plurality of cameras are installed around a vehicle, and images taken with these cameras are coordinate-converted and combined to express the situation around the vehicle as a single overhead view image for the driver. The ambient monitoring system to be presented has been put into practical use. (For example, Patent Document 1)

JP 2010-221863 A

  However, the surrounding monitoring device described in Patent Document 1 is a surrounding monitoring device that is assumed to be mounted on one vehicle. In such a surrounding monitoring device, each image captured by a plurality of cameras is coordinate-converted based on a predetermined rule, and each coordinate-converted image is combined into one image and displayed. ing. Therefore, coordinate conversion is required for a vehicle in which a plurality of vehicles are connected and the posture (orientation) changes between the front vehicle and the rear vehicle, such as a tow vehicle and a towed vehicle connected thereto. Since the rule for combining the plurality of images into one image changes according to the attitude of the vehicle, the conventional surrounding monitoring device cannot be applied as it is.

  The present invention has been made in view of the above-described problems, and images surrounding conditions of a vehicle regardless of the postures of a plurality of vehicles mounted on a tow vehicle and a towed vehicle towed by the tow vehicle. It is an object of the present invention to provide a tow vehicle surrounding monitoring device that can be easily presented to a driver and easily recognize the direction and position of an obstacle around the vehicle.

  The tow vehicle periphery monitoring device according to the present invention can easily confirm the positional relationship between an obstacle and a tow vehicle existing around the tow vehicle.

  That is, the tow vehicle surroundings monitoring device according to the present invention includes a tow vehicle having a first surrounding monitoring unit including a plurality of imaging units around the vehicle body, and a second surrounding including a plurality of imaging units around the vehicle body. A towed vehicle that is connected to the towed vehicle and towed, and a plurality of the image pickup units that the towed vehicle and the towed vehicle have; An information storage unit that stores a connection position between the tow vehicle and the towed vehicle, a connection detection unit that detects that the tow vehicle and the towed vehicle are connected, and a posture of the towed vehicle with respect to the tow vehicle. A posture detecting unit for detecting, a tire direction calculating unit for calculating a direction of a front wheel of the tow vehicle, a predicted route calculating unit for calculating a predicted route of the tow vehicle and the towed vehicle, and the first surrounding monitoring unit. Each captured image is displayed on the first surrounding monitoring unit. Based on each installation position, each installation direction, and each calibration data of the plurality of imaging units, the image data is converted into a plurality of first overhead images viewed from the first virtual viewpoint, and each of the images captured by the second surrounding monitoring unit An image conversion unit that converts an image into a plurality of second overhead images viewed from the second virtual viewpoint based on each installation position, each installation direction, and each calibration data of the plurality of imaging units included in the second surrounding monitoring unit. An image composition unit that combines the plurality of first bird's-eye images and the plurality of second bird's-eye images into a single composite image at a connection position of the tow vehicle and the towed vehicle, and a driver of the tow vehicle An image display unit that displays the composite image at a position where can be visually recognized, and when the connection detection unit detects the connection between the towed vehicle and the towed vehicle, the image conversion unit includes a plurality of image conversion units. The first overhead image and a plurality of the second overhead images The image composition unit generates the composite image based on the posture detected by the posture detection unit, and the direction of the front wheel of the tow vehicle, the tow vehicle, and the towed vehicle are added to the composite image. The predicted course is superimposed and displayed on the image display unit.

  According to the tow vehicle surroundings monitoring apparatus according to the present invention configured as described above, when the connection detection unit detects that the tow vehicle and the towed vehicle are connected, the image conversion unit Each image captured by a plurality of imaging units constituting the first surrounding monitoring unit installed in the storage unit is stored in the information storage unit, and each installation position and each installation of the plurality of imaging units included in the first surrounding monitoring unit Based on the direction and each calibration data, it is converted into a plurality of first overhead images viewed from the first virtual viewpoint, and is captured by a plurality of imaging units constituting a second surrounding monitoring unit installed around the towed vehicle. A plurality of second images obtained by looking down each image from the second virtual viewpoint based on each installation position, each installation direction, and each calibration data of the plurality of imaging units included in the second surrounding monitoring unit stored in the information storage unit. Convert to a bird's-eye view image. Then, the image composition unit synthesizes the plurality of first bird's-eye images and the plurality of second bird's-eye images based on the connection position between the tow vehicle and the towed vehicle and the posture detected by the posture detection unit to generate a composite image. . Further, the direction of the front wheels of the tow vehicle calculated by the tire direction calculation unit and the predicted routes of the tow vehicle and the towed vehicle calculated by the prediction route calculation unit are superimposed on the generated composite image and displayed on the image display unit. . Therefore, the position and direction of the obstacle around the tow vehicle and the towed vehicle can be easily recognized regardless of the posture of the towing vehicle and the towed vehicle.

  According to the tow vehicle surroundings monitoring device according to the present invention, the position and direction of an obstacle around the tow vehicle can be easily recognized even when the tow vehicle is towing the towed vehicle. .

(A) is a top view showing a schematic structure of a typical towing vehicle. FIG. 2B is a side view of the towing vehicle shown in FIG. (A) is a top view showing a schematic structure of a typical towed vehicle. (B) is a side view of a container-integrated towed vehicle. (C) is a side view of a towed vehicle with separate containers. It is a block diagram which shows the hardware component of Example 1 which is one Embodiment of this invention. It is a functional block diagram which shows the functional component of Example 1 which is one Embodiment of this invention. (A) is a figure which shows a mode that the virtual viewpoint was installed in the sky in the state which the tow vehicle pulled the towed vehicle. (B) is a figure which shows an example of the synthesized image produced | generated when a virtual viewpoint is installed in the state of Fig.5 (a). It is a figure explaining the superimposition process of the image performed when synthesize | combining several overhead images. In Example 1, it is a figure which shows an example of the synthesized image produced | generated when the tow vehicle is moving forward. In Example 1, it is a figure which shows an example of the synthesized image produced | generated when the tow vehicle is moving backward. In Example 1, it is a figure which shows an example of the image displayed on an image display part. 3 is a flowchart illustrating the overall flow of processing performed in the first embodiment. It is a flowchart which shows the flow of the superimposition process of the overhead image performed in the flowchart of FIG. It is a functional block diagram which shows the functional component of Example 2 which is one Embodiment of this invention. 10 is a flowchart illustrating the overall flow of processing performed in the second embodiment.

  Hereinafter, Example 1 which is one embodiment of the present invention will be described with reference to the drawings.

  In this embodiment, the present invention relates to a tow vehicle surrounding monitor that captures an image of the surroundings of a tow vehicle and a towed vehicle towed by the tow vehicle and displays an image of the surroundings of the vehicle to the driver. It is applied to the device.

(Description of schematic structure of tow vehicle and towed vehicle)
First, schematic structures of the tow vehicle and the towed vehicle will be described with reference to FIGS. 1 (a) and 1 (b) and FIGS. 2 (a), 2 (b), and 2 (c).

  The tow vehicle 10 has a schematic structure shown in FIGS. 1 (a) and 1 (b). That is, the tow vehicle 10 has a power source (not shown) and travels according to a driver's operation. A front camera 12a (imaging unit) is installed in front of the tow vehicle 10, a left camera 12b (imaging unit) is installed on the left side of the tow vehicle 10, and a rear camera 12c ( An imaging unit) is installed, and a right-side camera 12d (imaging unit) is installed on the right side of the towing vehicle 10. Each camera (12a, 12b, 12c, 12d) is installed toward the periphery of the tow vehicle 10, constitutes the first periphery monitoring unit 12, and captures an image including the ground around the tow vehicle 10. .

  The tow vehicle 10 is provided with a tow vehicle side connecting portion 14 having a hole. As will be described later, the towed vehicle 30 (40) (FIG. 2B, ( c)).

  The installation position and installation direction of each camera (12a, 12b, 12c, 12d), camera internal parameters (focal length, image center position, distortion aberration coefficient, etc.) that are calibration data, and the position of the tow vehicle side connecting portion 14 are set in advance It is measured and stored in a memory 17 (FIG. 3) described later.

  The towed vehicle 30 (40) has a schematic structure shown in FIGS. 2 (a), 2 (b), and 2 (c). The towed vehicle 30 (40) is connected to the above-described towed vehicle 10 (FIG. 1B) and used for transporting luggage, and has various variations depending on the form. FIG. 2B shows a side view of a container-integrated towed vehicle 30 that is an example of a towed vehicle, and FIG. 2C shows a container-specific towed vehicle 40 that is another example of a towed vehicle. The side view of is shown.

  A left side camera 32a (42a) (imaging unit) is installed on the left side of the towed vehicle 30 (40), and a rear camera 32b (42b) (imaging unit) is behind the towed vehicle 30 (40). The right camera 32c (42c) (imaging part) is installed on the right side of the towed vehicle 30 (40). Each camera (32a, 32b, 32c) is installed around the towed vehicle 30 (40) to constitute the second surrounding monitoring unit 32 (42), and the towed vehicle 30 (40). An image including the surrounding ground is taken.

  The towed vehicle 30 (40) is provided with a rod-like towed vehicle side connecting portion 34 (44), and the towed vehicle side connecting portion 34 (44) is fitted with the aforementioned towed vehicle side connecting portion 14. By joining, the tow vehicle 10 and the towed vehicle 30 (40) are connected.

  Installation position and installation direction of each camera (32a, 32b, 32c (42a, 42b, 42c)), camera internal parameters (focal length, image center position, distortion aberration coefficient, etc.) as calibration data, and towed vehicle side The position of the connecting portion 34 (44) is measured in advance and stored in a memory 37 (FIG. 3) described later.

  When the tow vehicle 10 travels with the towed vehicle 30 (40) connected, the direction of the towed vehicle 10 and the direction of the towed vehicle 30 (40) depend on the towed vehicle side connecting portion 14 or the towed vehicle side connecting portion 34 ( 44), the difference between the inner wheels becomes larger than when the tow vehicle 10 is traveling alone. Therefore, at an intersection or the like, it is necessary to pay more attention to pedestrians or other vehicles involved when turning.

In the following description, an example in which the container-integrated towed vehicle 30 is pulled by the towed vehicle 10 will be described.
(Description of System Configuration of Example 1)

  Next, a hardware configuration of the tow vehicle surroundings monitoring apparatus 100 according to the first embodiment will be described with reference to FIG. The tow vehicle surroundings monitoring device 100 includes a tow vehicle 10 and a towed vehicle 30 that are connected by a tow vehicle side connecting unit 14 and a towed vehicle side connecting unit 34. A front camera 12a, a left side camera 12b, a rear camera 12c, and a right side camera 12d constituting the surrounding monitoring unit 12 are installed. Further, the towed vehicle 30 is provided with a left side camera 32a, a rear camera 32b, and a right side camera 32c constituting the second surrounding monitoring unit 32. Each camera (12a, 12b, 12c, 12d, 32a, 32b, 32c) is equipped with an ultra-wide-angle lens having an angle of view of about 180 degrees. An image covering the entire periphery of the towed vehicle 30 is taken.

  The towed vehicle 30 further includes a second camera ECU 36, a memory 37, and a second CAN controller 38.

  The second camera ECU 36 is an AD converter that converts a composite signal (analog signal) output from each camera into a digitized image signal, and the digitized image signal is an RGB signal or a luminance color difference signal. It has a decoder for converting into YCbCr, H-Sync, and V-Sync signals.

  The memory 37 stores the camera internal parameters (focal length, image center position, distortion aberration coefficient, etc.) as the installation position, installation direction, and calibration data of each camera (32a, 32b, 32c) constituting the second surrounding monitoring unit 32. And the position of the towed vehicle side connection part 34 is memorize | stored.

  Images captured by the respective cameras (32a, 32b, 32c) constituting the second surrounding monitoring unit 32 are converted into digital images by the second camera ECU 36, via the second CAN controller 38, and via the CAN communication line 50. And transmitted to the towing vehicle 10. Further, the information stored in the memory 37 is also transmitted to the towing vehicle 10 through the second CAN controller 38 and the CAN communication line 50.

  In addition to the cameras (12a, 12b, 12c, 12d) described above, the tow vehicle 10 includes a first camera ECU 16, a memory 17, a first CAN controller 18, an attitude sensor 20, a connection detection sensor 22, and tires. A cutting angle sensor 24, a monitor 26 with a touch panel, and an ECU 28 are provided.

  The first camera ECU 16 includes an AD converter that converts a composite signal (analog signal) output from each camera (12a, 12b, 12c, 12d) constituting the first surrounding monitoring unit 12 into a digitized image signal. And a decoder for converting the digitized image signal into an RGB signal or a YCbCr, H-Sync, V-Sync signal which is a luminance color difference signal.

  In the memory 17, the camera internal parameters (focal length, image center position, distortion aberration coefficient) that are the installation position, installation direction, and calibration data of each camera (12 a, 12 b, 12 c, 12 d) constituting the first surrounding monitoring unit 12 are stored. Etc.) and the position of the towing vehicle side connecting portion 14 are stored.

  Information transmitted from the towed vehicle 30 via the CAN communication line 50 is received by the first camera ECU 16 and the ECU 28 via the first CAN controller 18.

  The posture sensor 20 is constituted by, for example, an angle sensor, and detects a connection angle (posture) between the tow vehicle 10 and the towed vehicle 30.

  The connection detection sensor 22 detects that the tow vehicle 10 and the towed vehicle 30 are connected, for example, by detecting energization due to contact.

  The tire break angle sensor 24 detects the direction of the front wheels of the tow vehicle 10.

  The monitor 26 with a touch panel displays a generated image and has a touch panel function, and detects an operation instruction such as screen switching.

The ECU 28 controls the overall movement of the tow vehicle surroundings monitoring apparatus 100 and uses a method for combining overlapping areas when the first surrounding monitoring unit 12 and the second surrounding monitoring unit 32 combine the images respectively captured. decide. Further, the predicted courses of the tow vehicle 10 and the towed vehicle 30 are calculated (description of the functional configuration of the first embodiment).

  Next, the functional configuration of the tow vehicle surrounding monitoring apparatus 100 will be described with reference to FIG. FIG. 4 is a functional block diagram showing a functional configuration of the tow vehicle surrounding monitoring device 100.

  The towed vehicle 30 is an image input unit composed of a plurality of cameras (32a, 32b, 32c) (imaging unit) constituting the second surrounding monitoring unit 32 and a second camera ECU 36 (FIG. 3), respectively. 36a, a towed vehicle information storage unit 37a (second information storage unit, information storage unit) configured by a memory 37 (FIG. 3), and an information transmission unit 38a configured by a second CAN controller 38 (FIG. 3). Become.

  The tow vehicle 10 is an image input composed of a plurality of cameras (12a, 12b, 12c, 12d) (imaging unit) constituting the first surrounding monitoring unit 12 and the first camera ECU 16 (FIG. 3), respectively. Unit 16a, image conversion unit 16b, image composition unit 16c, tow vehicle information storage unit 17a (first information storage unit, information storage unit) composed of memory 17 (FIG. 3), and first CAN controller 18 (FIG. 3). ) Constituted by an information receiving unit 18a, a posture detection unit 20a constituted by a posture sensor 20 (FIG. 3), a connection detection unit 22a constituted by a connection detection sensor 22 (FIG. 3), and a tire turning angle sensor. 24 (FIG. 3), a tire turning angle detection unit 24 a, an image boundary position calculation unit 28 a, a predicted course calculation unit 28 b, a tire direction calculation unit 28 c, and a touch panel configured by the ECU 28 (FIG. 3). Monitor 26 consisting of the image display unit 26a composed of a (FIG. 3).

  The image input unit 16a digitizes an image captured by each camera (12a, 12b, 12c, 12d) (imaging unit) constituting the first surrounding monitoring unit 12.

The image conversion unit 16b includes a plurality of first bird's-eye images I _VA that are obtained by bird's-eye view of images captured by the cameras (12a, 12b, 12c, and 12d) constituting the first surrounding monitoring unit 12, respectively. While converting to I _VB and I _VD (details will be described later), the images taken by the cameras (32a, 32b, 32c) (imaging unit) constituting the second surrounding monitoring unit 32 are respectively set to the second virtual viewpoint. Are converted into a plurality of second overhead images I _VE , I _VF , I _VG (details will be described later).

The image synthesizing unit 16c generates a first synthesized image I _V1 (details will be described later) by synthesizing the plurality of first overhead images I _VA , I _VB , and I _VD , and a plurality of second overhead images I _VE , I _VF and _IVG are combined to generate a second combined image I _V2 (details will be described later). Further, the first synthesized image I _V1 and the second synthesized image I _V2 are synthesized with a third synthesized image I _V (synthesized image) (details will be described later).

The image boundary position calculation unit 28 a is captured by the plurality of first overhead images I _VA , I _VB , and I _VD generated from the images captured by the first surrounding monitoring unit 12 and the second surrounding monitoring unit 32. The position of the boundary line when the plurality of second overhead images I _VE , I _VF , and I _VG generated from the respective images are superimposed is calculated.

  The predicted course calculation unit 28 b calculates the predicted paths of the tow vehicle 10 and the towed vehicle 30 using the tire direction (front wheel direction) of the tow vehicle 10 and the sizes of the tow vehicle 10 and the towed vehicle 30. .

The tire direction calculation unit 28c calculates the direction of the front wheel of the tow vehicle 10 based on the front wheel turning angle detected by the tire turning angle detection unit 24a.
(Description of composition of composite image)

Next, the configuration of the third composite image I _V (composite image) generated by the tow vehicle periphery monitoring device 100 will be described with reference to FIGS.

Each image captured by each camera (12a, 12b, 12c, 12d) (imaging unit) constituting the first surrounding monitoring unit 12 is virtually installed at the first virtual viewpoint V1 above the towing vehicle 10. It is converted into a first composite image I _V1 that is predicted to be observed from the first virtual camera.

Further, each image captured by each camera (32a, 32b, 32c) (imaging unit) constituting the second surrounding monitoring unit 32 is virtually installed at the second virtual viewpoint V2 above the towed vehicle 30. The second synthesized image I _V2 predicted to be observed from the second virtual camera is converted.

  The first virtual viewpoint V1, which is the installation position of the first virtual camera, and the second virtual viewpoint V2, which is the installation position of the second virtual camera, can be installed at arbitrary positions, but the first virtual viewpoint V1 is pulled. It is desirable to install directly above the car 10. The second virtual viewpoint V2 is directly above the towed vehicle 30 and at the same height as the first virtual viewpoint V1, so that the observation range of the first virtual viewpoint V1 and the observation range of the second virtual viewpoint V2 overlap. It is desirable to install.

This finally generates one third composite image I _V (composite image) overlooking the surroundings of the tow vehicle 10 and the towed vehicle 30, so that the third composite image I _V is not interrupted, This is because the third composite image _IV having uniform image quality is obtained. FIG. 5A shows a state in which the first virtual viewpoint V1 and the second virtual viewpoint V2 are installed in this way.

The first composite image I _V1 predicted to be observed from the first virtual viewpoint V1 is an image captured by each camera (12a, 12b, 12c, 12d) constituting the first surrounding monitoring unit 12, respectively. , Converted into a plurality of first overhead images I _VA , I _VB , and I _VD that are predicted to be observed from the first virtual viewpoint V 1, and further generated by combining these images into one image. The

  Here, the image of the connected towed vehicle 30 is reflected in the observation range of the rear camera 12c installed on the tow vehicle 10, and the rear of the towed vehicle 10 that is originally desired to be observed is not reflected. Then, the image imaged with the rear camera 12c is not used. The image captured by the rear camera 12c is used for the purpose of monitoring the rear of the tow vehicle 10 when the tow vehicle 10 travels alone (without connecting the towed vehicle).

Note that the second composite image I _V2 predicted to be observed from the second virtual viewpoint V2 is an image captured by each camera (32a, 32b, 32c) constituting the second surrounding monitoring unit 32, respectively. , Converted into a plurality of second overhead images I _VE , I _VF , I _VG that are predicted to be observed from the second virtual viewpoint V 2, and further synthesized into a single image. The

A plurality of first bird's-eye images I _VA , I _VB , which are predicted to be observed from the first virtual viewpoint V <b> 1 with images taken by the cameras (12 a, 12 b, 12 c) constituting the first surrounding monitoring unit 12. There are various methods for converting to _IVD , any of which may be used. For example, assuming that a flat ground (a plane having a height of 0) is reflected in each image taken by each camera (12a, 12b, 12c), the ground point is the first virtual viewpoint. It can be generated by sequentially calculating which position (coordinate) is observed on the plurality of first overhead images I _VA , I _VB , and I _{VD as} viewed from V1. A plurality of second overhead images I _VE , I _VF , and I _VG can be generated in the same manner.

Then, the plurality of first bird's-eye images I _VA , I _VB , and I _VD are synthesized with the first synthesized image I _V1 , and the plurality of second bird's-eye images I _VE , I _VF , and I _VG are synthesized with the second synthesized image I _V2 . The first synthesized image I _V1 and the second synthesized image I _V2 are synthesized into one third synthesized image _IV at the positions of the boundary lines L1 and L2.

At this time, the first composite image I _V1 and the second composite image I _V2 include the pixels corresponding to the position of the tow vehicle side connecting portion 14 of the tow vehicle 10 in the first composite image I _V1 , and the second composite image I. Synthesis is performed by matching the pixels corresponding to the position of the towed vehicle side connecting portion 34 of the towed vehicle 30 in _V2 . That is, the first synthesized image I _V1 and the second synthesized image I _V2 are synthesized at the position of the point C8 shown in FIG.

Note that the orientation of the two images is not specified only by matching the point C8. Therefore, the angle (posture) formed by the tow vehicle 10 and the towed vehicle 30 is detected, and the first composite image I _V1 and the second composite image I _V2 are combined at an angle corresponding to this posture. In the case of FIGS. 5A and 5B, since the tow vehicle 10 and the towed vehicle 30 are in the straight traveling state, the first composite image I _V1 and the second composite image I _V2 are as shown in FIG. 5B. Are synthesized in the same direction.

Next, a method for generating the first overhead images I _VA , I _VB , and I _VD and the second overhead images I _VE , I _VF , and I _VG will be described. A plurality of first bird's-eye images I _VA , I _VB , I that are predicted to be observed from the first virtual viewpoint V <b> 1 with images taken by the cameras (12 a, 12 b, 12 c) constituting the first surrounding monitoring unit 12. _{In order} to convert to _VD and further combine with the first composite image _IV1 , the installation position and installation direction of each camera (12a, 12b, 12c) and the camera internal parameters of each camera (12a, 12b, 12c) (Focal length, image center position, distortion aberration coefficient, etc.) are required. Among these, the installation position and installation direction of each camera (12a, 12b, 12c) can be measured in advance. The camera internal parameters can be estimated by calibrating each camera (12a, 12b, 12c). Thus, the value acquired beforehand is memorize | stored in the tow vehicle information storage part 17a (1st information storage part, information storage part) (FIG. 4). It should be noted that the necessary coordinate conversion and synthesis calculations may be performed each time using the values stored in the tow vehicle information storage unit 17a. However, in order to perform the calculation more efficiently, the rules for coordinate conversion and synthesis are used. May be prepared in the form of a coordinate conversion synthesis table configured in advance with a LUT (lookup table).

Similarly, a plurality of second bird's-eye images predicted to be observed from the second virtual viewpoint V2 with respect to each image captured by each camera (32a, 32b, 32c) constituting the second surrounding monitoring unit 32. In order to convert into I _VE , I _VF , I _VG and further synthesize to the second composite image I _V2 , the mounting position and installation direction of each camera (32a, 32b, 32c) and each camera (32a, 32b) , 32c) are required. As described above, these values are measured in advance and stored in the towed vehicle information storage unit 37a (second information storage unit, information storage unit) (FIG. 4). In addition, as described above, in order to perform necessary coordinate conversion and synthesis operations more efficiently, the rules for coordinate conversion and synthesis are set in the format of a coordinate conversion synthesis table that is configured in advance by a LUT (lookup table). It may be prepared.

In order to generate the third composite image I _V (composite image) by combining the first composite image I _V1 and the second composite image I _V2 generated in this way, the position of the point C8 described above, and The attitude of the tow vehicle 10 and the towed vehicle 30 is required.

  Among these, the position of the point C8 is the position of the tow vehicle side connection unit 14 stored in the tow vehicle information storage unit 17a and the position of the towed vehicle side connection unit 34 stored in the towed vehicle information storage unit 37a. It can be obtained by referring. Moreover, the attitude | position of the tow vehicle 10 and the towed vehicle 30 can be detected by the attitude | position detection part 20a.

Here, the positions of the boundary lines L <b> 1 and L <b> 2 shown in FIG. 5B change according to the attitude of the towed vehicle 30 with respect to the towed vehicle 10 (an angle formed between the towed vehicle 10 and the towed vehicle 30). Therefore, when the postures of the tow vehicle 10 and the towed vehicle 30 change, the positions of the boundary lines L1 and L2 change, and the form of the third composite image I _V (composite image) changes accordingly. A specific form of the third composite image _IV corresponding to the posture change will be described later.

Further, in the third composite image I _V (composite image), as shown in FIG. 5B, the tow vehicle icon R ₁ overlooking the tow vehicle 10 from directly above and the tow vehicle 30 overlooked from directly above. towed vehicle icon R ₂ that is superimposed respectively.

Further, the third composite image I _{V (composite} image), and left front wheel T _L and orientation of the right front wheel T _R of the towing vehicle 10 is drawn, and the predicted course Tra of the left front wheel T _L of the towing vehicle 10, traction a predicted course Trb of the right front wheel T _R of the car 10, and the predicted course Trc of the left rear wheel of the towing vehicle 30, the predicted route Trd of the right rear wheel of the tractor 30, are drawn respectively. Left direction of the front wheel T _L and the right front wheel T _R of the towing vehicle 10, based on tire turning angle detected by the tire turning angle detection unit 24a (FIG. 4), is calculated in the tire direction calculation section 28c (Fig. 4) The Further, the predicted courses Tra, Trb, Trc, and Trd are calculated by the predicted course calculation unit 28b using the sizes of the tow vehicle 10 and the towed vehicle and the tire installation positions. It is assumed that necessary vehicle information is stored in advance and used as necessary.

The third composite image I _V (composite image) generated in this way is output to the image display unit 26 a (FIG. 4) installed on the towing vehicle 10. Then, the driver of the tow vehicle 10 confirms the third composite image _IV to determine the presence of obstacles around the tow vehicle 10 and the towed vehicle 30 and the predicted course of the towed vehicle 10 and the towed vehicle 30. Know and drive.

In order to simplify the following description, the cameras (12a, 12b, 12d) (FIG. 1 (a)) constituting the first surrounding monitoring unit 12 are positioned at points C1, C2, and C4, respectively. It shall be installed. In addition, it is assumed that the cameras (32a, 32b, 32c) (FIG. 2 (a)) constituting the second surrounding monitoring unit 32 are installed at the positions of points C5, C6, and C7, respectively.
(Description of the method of combining the first composite image and the second composite image)

Next, a method for synthesizing the first synthesized image I _V1 and the second synthesized image I _V2 will be described with reference to FIG.

FIG. 6 is an enlarged view of only the right half region of the third composite image I _V (composite image) shown in FIG. As shown in FIG. 6, the first synthesized image I _V1 predicted to be observed from the first virtual viewpoint V1 (FIG. 5A) and the second virtual viewpoint V2 (FIG. 5A) are observed. The second synthesized image I _V2 predicted to be synthesized is synthesized at the position of the boundary line L1.

Here, installed at the position of the point C4, the imaging region Z ₀₄ of the right side camera 12d of the towing vehicle 10 (FIG. 1 (a)), which is installed at a position of the point C7, the right side of the tractor 30 the imaging region _{Z 07} of the camera 32c (FIG. 2 (a)), is assumed to be arranged so as to have overlapping imaging region _{Z 0.}

Therefore, for example, the position of the point A and the position of the point B shown in FIG. 6 are respectively the right side camera 12d (FIG. 1A) of the tow vehicle 10 and the right side camera 32c of the towed vehicle 30 (FIG. 2). Observed in both a)). Therefore, when synthesizing the first synthetic image I _V1 the second synthetic image I _V2, the overlapping imaging area Z ₀ it is necessary to select the information observed by either camera of the right side camera 12d, 32c There is.

In Example 1, the focused point A in the overlapping imaging areas Z _0, as viewed from the point B, of the right side camera 32c of the right side camera 12d and towed vehicle 30 of the tractor 10, in a closer camera Select the imaged information. This is because a higher-quality third composite image I _V (composite image) is generated by selecting and using information with higher resolution, which is captured at a position close to the camera.

  For example, in the example shown in FIG. 6, since the length of the line segment AC4 <the length of the line segment AC7 at the point A, the information captured by the right-side camera 12d installed at the point C4 of the towing vehicle 10 is selected. Is done. Further, at point B, the length of the line segment BC4 is greater than the length of the line segment BC7, and therefore information captured by the right side camera 32c installed at the point C7 of the towed vehicle 30 is selected.

That is, information captured by the right-side camera 12d of the tow vehicle 10 is selected above the boundary line L1 with the perpendicular bisector connecting the point C4 and the point C7 as the boundary line L1. Further, below the boundary line L1, information captured by the right side camera 32c of the towed vehicle 30 is selected. Then, the first synthesized image I _V1 and the second synthesized image I _V2 are synthesized to generate a third synthesized image I _V (synthesized image).
(Description of an example of the third composite image (composite image))

Next, an example of the third synthesized image I _V (synthesized image) generated in the first embodiment will be described with reference to FIGS. 7, 8, and 9.

FIG. 7 is an example of a third composite image I _V (composite image) generated when the tow vehicle 10 is turning right while moving forward with the towed vehicle 30 connected. When the tow vehicle 10 and the towed vehicle 30 are in the state shown in FIG. 7, the towed vehicle 10 moves in the right direction with respect to the towed vehicle 30 with the towed vehicle side connecting portion 14 (the towed vehicle side connecting portion 34) as a fulcrum. It is suitable. The angle is detected by the posture detection unit 20a (FIG. 4). And the 1st bird's-eye view image _IVA , _IVB , _IVD produced _| generated by each camera (12a, 12b, 12d) (Fig.1 (a)) which comprises the 1st surroundings monitoring part 12 was produced _| generated. One composite image I _V1 and a plurality of second overhead images I _VE , I _VF , I _VG captured by the cameras (32a, 32b, 32c) (FIG. 2A) constituting the second surrounding monitoring unit 32 _Are synthesized according to the detected angle. At this time, in order to improve the visibility of the third composite image I _V (composite image), the first composite image I _V1 including the tow vehicle 10 is always displayed at the same position in a state of facing directly upward. The

As described above, the boundary line L1 when the first overhead image I _VD that is a part of the first composite image I _V1 and the second overhead image I _VG that is a part of the second composite image I _V2 is synthesized, It is set as a perpendicular bisector of a line segment connecting points C4 and C7. Similarly, the boundary line L2 when combining the first overhead image I _VB that is a part of the first composite image I _V1 and the second overhead image I _VE that is a part of the second composite image I _V2 It is set as a perpendicular bisector of a line segment connecting the point C2 where the left side camera 32a of the car 10 is installed and the point C5 where the left side camera 32a of the towed vehicle 30 is installed.

When the angle formed by the tow vehicle 10 and the towed vehicle 30 is increased, a blind area is generated from each camera (12a, 12b, 12d, 32a, 32b, 32c). The position corresponding to the blind spot region Z _P, and stores a predetermined value (e.g., 0) as shown in FIG. 7 shows that there is no information.

Also, the left front wheel _{T L} and the right front wheel _{T R} orientation of the towing vehicle 10, and the tractor 10, the predicted course of the towing vehicle 30 Tra, Trb, Trc, Trd, respectively third combined image _{I V} (composite image) The future movements of the tow vehicle 10 and the towed vehicle 30 are visualized.

FIG. 8 is an example of a third composite image I _V (composite image) that is generated when the tow vehicle 10 is reversing while steering to the left with the tow vehicle 30 connected.

Also in this case, as described above, the first composite image I _V1 and the second composite image I _V2 are combined at an angle corresponding to the postures of the tow vehicle 10 and the towed vehicle 30. The positions of the boundary lines L1 and L2 are also calculated as described above, and the first synthesized image I _V1 and the second synthesized image I _V2 are synthesized.

9, when the third combined image I _{V (composite} image) is obtained as shown in FIG. 8, an example of a display information I _P to be displayed on the image display unit 26a (FIG. 4). The image display unit 26a has combines a touch panel function, as shown in FIG. 9, the third synthetic image I _V and the rear camera 32b of the towed vehicle 30 (FIG. 2 (a)) the rearward image captured by the I _B If, the information operation icon Q _1, Q ₂ is an operation switch for switching as necessary display information I _P are respectively displayed. Each image and icons on the display screen I _C, is placed at a predetermined position. The driver of the tractor 10, to confirm the display information I _P, carry out the operation in terms of recognizing the surrounding circumstances.
(Description of the flow of processing in the first embodiment)

  Next, a specific processing flow of the first embodiment will be described with reference to the flowcharts of FIGS.

  FIG. 10 is a flowchart illustrating an overall flow of processing performed in the first embodiment. In the following, description will be given in order. Note that the flowchart of FIG. 10 is automatically and repeatedly executed at a predetermined cycle.

  (Step S10) It is detected whether the tow vehicle 10 and the towed vehicle 30 are connected. If it is confirmed that the connection is established, the process proceeds to step S15. If the connection cannot be confirmed, the process of FIG. 10 is terminated.

  (Step S15) By determining whether or not a camera (imaging unit) is installed in the towed vehicle 30, it is determined whether or not the second camera ECU 36 (FIG. 3) constituting the image input unit 36a is installed. to decide. When it is confirmed that the second camera ECU 36 is installed in the towed vehicle 30, the process proceeds to step S20, and otherwise, the process of FIG. 10 is terminated.

  (Step S20) It is determined whether or not Step S20 has been executed previously. When step S20 is executed for the first time, the process proceeds to step S25, and otherwise, the process proceeds to step S35.

  (Step S25) Information stored in the towed vehicle information storage unit 37a (second information storage unit, information storage unit) is transferred to the towed vehicle 10. As a result, the installation position, installation direction, camera internal parameters, and position of the towed vehicle side connecting unit 34 of each camera (32a, 32b, 32c) constituting the second surrounding monitoring unit 32 are transferred to the towing vehicle 10 respectively. Is done.

  (Step S30) In the cameras (imaging units) constituting the first surrounding monitoring unit 12 installed in the tow vehicle 10, it is determined whether there is a camera that is unnecessary when the towed vehicle 30 is connected. In the case of the first embodiment, as described above, it is determined that the rear camera 12c is unnecessary, the power supply to the rear camera 12c is stopped, and the rear camera 12c is not used for the subsequent processing. In addition, since the camera which becomes unnecessary changes with forms of the towed vehicle to be connected, the towed vehicle is connected in advance to, for example, the towed vehicle information storage unit 17a (first information storage unit, information storage unit). In this case, a rule that the power supply of a predetermined camera is cut off (for example, the rear camera 12c is stopped when the towed vehicle 30 is connected) is stored, and the determination may be made based on this rule.

  (Step S <b> 35) Images captured by the cameras (32 a, 32 b, 32 c) (imaging unit) constituting the second surrounding monitoring unit 32 installed in the towed vehicle 30 are transferred to the towing vehicle 10.

(Step S40) The image conversion unit 16b generates first overhead images I _VA , I _VB , I _VD and second overhead images I _VE , I _VF , I _VG .

(Step S45) In the image composition unit 16c, the first overhead images I _VA , I _VB , and I _VD are synthesized to generate the first synthesized image I _V1 , and the second overhead images I _VE , I _VF , and I _VG are synthesized. Thus, a second composite image I _V2 is generated.

(Step S50) The first synthesized image I _V1 and the second synthesized image I _V2 are superimposed to generate a third synthesized image I _V (synthesized image). The detailed flow of this process will be described later.

(Step S55) to detect the front wheels _T L, _{T R} orientation of the towing vehicle 10 by the tire turning angle sensor 24, the detected front wheel _T L, based on the orientation of the _{T R,} to draw the front wheels of the towing vehicle 10 . Further, the estimated paths Tra, Trb, Trc, and Trd of the tow vehicle 10 and the towed vehicle 30 are estimated, and the estimated predicted paths Tra, Trb, Trc, and Trd are superimposed on the third synthesized image I _V (synthesized image). indicate.

(Step S60) The third composite image I _V (composite image) is displayed on the image display unit 26a.

Although not described in the flowchart of FIG. 10, the third synthesis is performed when the engine of the tow vehicle 10 is stopped, when the connection between the tow vehicle 10 and the towed vehicle 30 is released, or by the operation of the driver. When the display of the image I _V (composite image) is erased, the processing in FIG. 10 is stopped.

Next, with reference to FIG. 11, the flow of the overlay process of the first composite image I _V1 and the second composite image I _V2 performed in step S50 will be described in detail.

  (Step S <b> 80) In the posture detection unit 20 a, the postures of the tow vehicle 10 and the towed vehicle 30 are calculated based on the angle formed by the towed vehicle 10 and the towed vehicle 30.

(Step S82) The image boundary position calculation unit 28a calculates the positions of the boundary lines L1 and L2 when the first composite image I _V1 and the second composite image I _V2 are superimposed.

(Step S84) In the image composition unit 16c, the first composite image I _V1 and the second composite image I _V2 are superimposed to generate a third composite image I _V (composite image). Specifically, as described above, necessary image information is selected and superimposed on the boundary lines L1 and L2. Thereafter, the process returns to the main routine (flow chart in FIG. 10).

Next, a tow vehicle periphery monitoring device 110, which is another embodiment of the present invention, will be described.
(Description of System Configuration of Example 2)

In the second embodiment, the present invention is applied to a towed vehicle surrounding monitoring device 110 that monitors the surroundings of the towed vehicle 10 to which the towed vehicle 30 is connected. FIG. 12 is a functional block diagram showing a functional configuration of the tow vehicle periphery monitoring device 110. Hereinafter, only differences from the tow vehicle surrounding monitoring apparatus 100 (FIG. 4) will be briefly described.
(Explanation of functions and operations of Embodiment 2)

The tow vehicle surroundings monitoring device 110 has the same function as the tow vehicle surroundings monitoring device 100 described in the first embodiment, but the internal functional configuration is different. The first bird's-eye view images I _VA , I _VB , I _VD , the second bird's-eye view images I _VE , I _VF , I _VG , the first synthesized image I _V1 , and the second synthesized image generated by the tow vehicle surrounding monitoring device 110. I _V2 and the third synthesized image I _V (synthesized image) are both the same as those described in the first embodiment.

  The difference in configuration between the tow vehicle surroundings monitoring device 110 and the tow vehicle surroundings monitoring device 100 is that, in the tow vehicle surroundings monitoring device 100, the towed vehicle 30 is connected to the towed vehicle information storage unit 37a (second information storage unit). ) Stores the installation position and installation direction of each camera (32a, 32b, 32c) constituting the second surrounding monitoring unit 32, the camera internal parameters, and the position of the towing vehicle side connecting unit 14, and When the towed vehicle 30 is connected, the information is transferred to the towed vehicle 10, whereas in the towed vehicle surrounding monitoring device 110, the towed vehicle 30 can identify the towed vehicle 30. Only the identification information that can be stored is stored. This identification information is stored in the identification information storage unit 39a shown in FIG.

  A towed vehicle information storage unit 19a (third information storage unit) installed in the tow vehicle 10 includes a plurality of towed vehicles (30, 40,...) That may be connected to the tow vehicle 10. Each identification information, installation position of each camera installed in each towed vehicle, installation direction, camera internal parameters, and towed vehicle side connecting portion (34, 44,...) Are stored.

  When the tow vehicle 10 and the towed vehicle 30 are connected, the identification information stored in the towed vehicle 30 is transferred to the towed vehicle 10.

  When the tow vehicle 10 receives the identification information of the towed vehicle 30, the tow vehicle 10 collates with the identification information stored in the towed vehicle information storage unit 19 a (third information storage unit) to identify the connected towed vehicle 30. To do. And the installation position of the camera installed in the towed vehicle 30, the installation direction, the camera internal parameters, and the position of the towed vehicle side connecting portion 34 transferred to the towed vehicle 10 are read.

Based on the read information, a plurality of images captured by the cameras (32a, 32b, 32c) constituting the second surrounding monitoring unit 32, which are sequentially transmitted from the towed vehicle 30, are respectively converted into overhead images. In addition to the conversion, the plurality of converted overhead images are combined according to the attitudes of the tow vehicle 10 and the towed vehicle 30 to generate the third combined image I _V (composite image) described in the first embodiment. The

Since various types of tow vehicles (30, 40,...) Are connected to the tow vehicle 10, the tow vehicle installed in the tow vehicle 30 in the first embodiment by adopting such a configuration. The storage capacity of the information storage unit 37a (FIG. 4) can be reduced. Further, since only the identification information needs to be transmitted when the towed vehicle is connected, the towed vehicle surrounding monitoring device 110 can output the third composite image I _V (composite image) immediately after the connection. , Operational efficiency can be improved.
(Description of processing flow of embodiment 2)

  Next, a specific processing flow of the second embodiment will be described with reference to the flowchart of FIG. Note that the flowchart of FIG. 13 is automatically and repeatedly executed at a predetermined cycle.

  (Step S100) It is detected whether the tow vehicle 10 and the towed vehicle 30 are connected. If it is confirmed that the connection is established, the process proceeds to step S105. If the connection cannot be confirmed, the process of FIG. 13 is terminated.

  (Step S105) Whether or not a camera (imaging unit) is installed in the towed vehicle 30 is determined using whether or not the second camera ECU 36 (FIG. 3) constituting the image input unit 36a is installed. . When it is confirmed that the second camera ECU 36 is installed in the towed vehicle 30, the process proceeds to step S110, and otherwise, the process of FIG. 13 is terminated.

  (Step S110) It is determined whether or not Step S110 has been executed previously. When step S110 is executed for the first time, the process proceeds to step S115, and otherwise, the process proceeds to step S125.

  (Step S115) The identification information of the towed vehicle 30 stored in the identification information storage unit 39a is transferred to the towing vehicle 10. And the towed vehicle 30 connected is specified by the tow vehicle 10 side.

  (Step S <b> 120) In the cameras (imaging units) constituting the first surrounding monitoring unit 12 installed in the tow vehicle 10, it is determined whether there is a camera that is unnecessary when the towed vehicle 30 is connected. In the case of the second embodiment, it is determined that the rear camera 12c is unnecessary, the power supply to the camera 12c is stopped, and the camera 12c is not used for the subsequent processing.

  (Step S <b> 125) Images captured by the cameras (32 a, 32 b, 32 c) (imaging unit) constituting the second surrounding monitoring unit 32 installed in the towed vehicle 30 are transferred to the towing vehicle 10.

(Step S130) The image conversion unit 16b generates the first overhead images I _VA , I _VB , I _VD and the second overhead images I _VE , I _VF , I _VG .

(Step S135) In the image composition unit 16c, the first overhead images I _VA , I _VB , and I _VD are synthesized to generate the first synthesized image I _V1 , and the second overhead images I _VE , I _VF , and I _VG are synthesized. Thus, a second composite image I _V2 is generated.

(Step S140) The first synthesized image I _V1 and the second synthesized image I _V2 are overlapped to generate a third synthesized image I _V (synthesized image). The flow of this process is as described in the flowchart of FIG.

(Step S145) detects the front wheel _T L, _{T R} orientation of the towing vehicle 10 by the tire turning angle sensor 24, the detected front wheel _T L, based on the orientation of the _{T R,} to draw the front wheels of the towing vehicle 10 . Further, the estimated paths Tra, Trb, Trc, and Trd of the tow vehicle 10 and the towed vehicle 30 are estimated, and the estimated predicted paths Tra, Trb, Trc, and Trd are superimposed on the third synthesized image I _V (synthesized image). indicate.

(Step S150) The third composite image I _V (composite image) is displayed on the image display unit 26a.

Although not described in the flowchart of FIG. 13, the third synthesis is performed when the engine of the tow vehicle 10 stops, when the connection between the tow vehicle 10 and the towed vehicle 30 is released, or by the operation of the driver. When the display of the image I _V (composite image) is deleted, the processing in FIG. 13 is stopped.

As described above, according to the tow vehicle surrounding monitoring device 100 according to the first embodiment of the present invention configured as described above, the connection detection unit 22a indicates that the tow vehicle 10 and the towed vehicle 30 are connected. When detected, the image conversion unit 16b is imaged by a plurality of cameras (12a, 12b, 12c, 12d) (imaging units) constituting the first surrounding monitoring unit 12 installed around the tow vehicle 10. Each installation position and each installation of the plurality of cameras (12a, 12b, 12c, 12d) (imaging unit) of the first surrounding monitoring unit 12 stored in the tow vehicle information storage unit 17a (information storage unit). Based on the direction and each calibration data, the second surroundings installed around the towed vehicle 30 are converted into a plurality of first overhead images (I _VA , I _VB , I _VD ) viewed from the first virtual viewpoint V 1. A plurality of cameras constituting the monitoring unit 32 32 a, 32 b, 32 c) (image pickup unit), a plurality of cameras (32 a, 32 b) included in the second surrounding monitoring unit 32 stored in the towed vehicle information storage unit 37 a (information storage unit). , 32c) is converted into a plurality of second overhead images (I _VE , I _VF , I _VG ) viewed from the second virtual viewpoint V2 based on each installation position, each installation direction, and each calibration data of the (imaging unit). Then, based on the connection position of the tow vehicle 10 and the towed vehicle 30 and the attitude detected by the attitude detection unit 20a, the image composition unit 16c and the plurality of first overhead images (I _VA , I _VB , I _VD ) and the plurality of images. The third overhead image (I _VE , I _VF , I _VG ) is synthesized to generate a third synthesized image I _V (synthesized image). Further, the third composite image I _V generated, the front wheel T _L of the towing vehicle 10 which is calculated tire direction calculation section 28c _is, T and orientation of _R, tractor 10 and towed vehicle predicted course calculation unit 28b is calculated 30 predicted courses Tra, Trb, Trc, and Trd are superimposed and displayed on the image display unit 26a. Therefore, the positions and directions of obstacles around the tow vehicle 10 and the towed vehicle 30 can be easily recognized regardless of the postures of the towing vehicle 10 and the towed vehicle 30.

In particular, according to the tow vehicle surrounding monitoring apparatus 100 according to the first embodiment of the present invention, when the connection detection unit 22a detects that the tow vehicle 10 and the towed vehicle 30 are connected, the towed vehicle information storage is performed. Each installation position, each installation direction, each calibration data of the plurality of cameras (32a, 32b, 32c) (imaging unit), and a connection position with the tow vehicle 10 stored in the unit 37a (second information storage unit) Each image captured by the second surrounding monitoring unit 32 is transmitted to the towing vehicle 10 by the information transmitting unit 38a. Then, the information receiving unit 18a of the tow vehicle 10 receives the transmitted information, and based on the received information, each image captured by the plurality of cameras (32a, 32b, 32c) is displayed by the image converting unit 16b. Conversion into a plurality of second overhead images (I _VE , I _VF , I _VG ). Further, each image captured by the first surrounding monitoring unit 12 provided in the tow vehicle 10 is stored in the tow vehicle information storage unit 17a (first information storage unit), and a plurality of cameras (12a, 12b, 12c, 12d) Based on each installation position, each installation direction, and each calibration data of (imaging part), it converts into several 1st bird's-eye view images ( _IVA , _IVB , _IVD ). Then, in the image composition unit 16c, the installation positions of the cameras (12a, 12b, 12c, 12d) (imaging unit) stored in the tow vehicle information storage unit 17a, the connection positions with the towed vehicle 30, A plurality of first overhead images based on the installation positions of the plurality of cameras (32a, 32b, 32c) (imaging unit) and the connection position with the tow vehicle 10 stored in the tow vehicle information storage unit 37a. A first synthesized image I _V1 synthesized from (I _VA , I _VB , I _VD ) and a second synthesized image I _V2 synthesized from a plurality of second overhead images (I _VE , I _VF , I _VG ), respectively, Further, the first synthesized image I _V1 and the second synthesized image I _V2 are synthesized to generate a third synthesized image I _V (synthesized image). Therefore, even when a plurality of types of towed vehicles having different forms are connected to the tow vehicle 10, it is possible to easily generate an image in which the surroundings of the tow vehicle and the towed vehicle are overhead.

Moreover, according to the tow vehicle surroundings monitoring apparatus 100 according to the first embodiment of the present invention configured as described above, the image composition unit 16c can select from the first composite image I _V1 and the second composite image I _V2 . An overlapping imaging area Z _{0 in} which the same position is imaged is detected, and in the detected overlapping imaging area Z ₀ , imaging is performed at a higher resolution of the first surrounding monitoring unit 12 and the second surrounding monitoring unit 32. The information thus reflected is reflected in the third composite image _IV . Therefore, it is possible to generate the third composite image _IV with high visibility.

Then, according to the towing vehicle for surrounding monitoring apparatus 100 according to a first embodiment of the present invention configured in this manner, the image combining unit 16c, in the overlapping imaging areas Z _0, the first peripheral monitoring unit 12 first 2. Information captured from a closer location in the surroundings monitoring unit 32 is reflected in the third composite image _IV . Therefore, it is possible to generate the third composite image _IV with higher visibility by simple calculation.

Furthermore, according to the tow vehicle surrounding monitoring apparatus 100 according to the first embodiment of the present invention configured as described above, the third composite image _IV is arranged at the same position in the same direction in the first composite image I. _The position indicating the connection position with the towed vehicle 10 in the second composite image I _V2 is matched with the position indicating the connection position with the towed vehicle 30 in _V1 , and the second composite image I _V2 is further displayed. Then, the image is rotated and synthesized by an amount corresponding to the attitude detected by the attitude detection unit 20a. Therefore, it is possible to obtain the third composite image _{IV in} which the surrounding conditions of the tow vehicle 10 and the towed vehicle 30 can be easily recognized.

In addition, according to the tow vehicle surroundings monitoring device 100 according to the first embodiment of the present invention configured as described above, the first composite image I _V1 is arranged in a direction in which the front of the tow vehicle 10 is located at the top. . Therefore, since the front of the tow vehicle 10 is always displayed on the upper part of the image display unit 26a, it is possible to obtain the first composite image I _V1 that makes it easier to recognize the surrounding situation.

And according to the tow vehicle periphery monitoring apparatus 100 according to the first embodiment of the present invention configured as described above, when the connection detecting unit 22a detects the connection between the tow vehicle 10 and the towed vehicle 30, the first Of the plurality of cameras (12a, 12b, 12c, 12d) (imaging unit) included in the surrounding monitoring unit 12, the output of the imaging unit that is behind the towed vehicle 30 and cannot monitor the surroundings of the towing vehicle 10 is do not use. Therefore, unnecessary information in the third combined image I _V is not displayed, it is possible to improve the quality of the third combined image I _V. In addition, since an unnecessary imaging unit is not used, power consumption of the tow vehicle surrounding monitoring device 100 can be saved.

Moreover, according to the tow vehicle surroundings monitoring device 110 according to the second embodiment of the present invention configured as described above, when the connection detection unit 22a detects that the tow vehicle 10 and the towed vehicle 30 are connected. The identification information for identifying the towed vehicle 30 stored in the identification information storage unit 39a and the images captured by the second surrounding monitoring unit 32 are transmitted to the towed vehicle 10 by the information transmission unit 38a. The information receiving unit 18a of the tow vehicle 10 receives the transmitted information, the image conversion unit 16b identifies the towed vehicle 30 with reference to the identification information, and each received image is represented by the towed vehicle information. Each installation position, each installation direction, each calibration data of the plurality of cameras (32a, 32b, 32c) (imaging unit) stored in the storage unit 19a (third information storage unit), and a connection position of the towing vehicle 10 Based on the above, it is converted into a plurality of second overhead images (I _VE , I _VF , I _VG ). Further, each of the images captured by the first surrounding monitoring unit 12 provided in the tow vehicle 10 by the image conversion unit 16b is stored in the tow vehicle information storage unit 17a (first information storage unit). , 12b, 12c, 12d) (imaging unit) is converted into a plurality of first bird's-eye images (I _VA , I _VB , I _VD ) based on each installation position, each installation direction, and each calibration data. Then, in the image composition unit 16c, the installation positions of the plurality of cameras (12a, 12b, 12c, 12d), the connection positions with the towed vehicle 30, and the towed vehicle stored in the towed vehicle information storage unit 17a. Based on the installation positions of the plurality of cameras (32a, 32b, 32c) and the connection positions with the tow vehicle 10 stored in the information storage unit 19a, a plurality of first overhead images (I _VA , I _VB). the first synthetic image _{I V1} and a plurality of second overhead image _{(I VE} obtained by combining the _{I VD),} I _VF, respectively generate a second combined image _{I V2} obtained by combining the _{I VG),} further, the first synthesized image I _V1 and the second synthesized image I _V2 are synthesized to generate a third synthesized image _IV . Therefore, since only the identification information of the towed vehicle 30 needs to be stored in the identification information storage unit 39a of the towed vehicle 30, the storage capacity to be stored in the towed vehicle 30 can be reduced, and the hardware The configuration can be simplified. Furthermore, since only the identification information needs to be transmitted when the towed vehicle 30 is connected, the towed vehicle surrounding monitoring device 110 immediately receives the third composite image I _V after the towed vehicle 10 and the towed vehicle 30 are connected. Can be output, and operational efficiency can be improved.

  In the first and second embodiments, the analog signals output from the cameras (12a, 12b, 12c, 12d, 32a, 32b, 32c) (imaging unit) are converted into digital signals, and necessary conversion and synthesis processing is performed. However, the present invention is not limited to this configuration, and a system configuration using a camera capable of digital output is adopted and output from the camera. A configuration may be adopted in which the processed digital signal is subjected to image processing as it is.

  In the first and second embodiments, the CAN communication line 50 is used to exchange information between the tow vehicle 10 and the towed vehicle 30, but this communication means is limited to the CAN communication line 50. Instead of this, other communication lines such as a general serial communication line may be used.

In the first and second embodiments, the positions of the boundary lines L1 and L2 when the first composite image I _V1 and the second composite image I _V2 are superimposed are calculated by the image boundary position calculation unit 28a. The method synthesizes a plurality of first overhead images I _VA , I _VB , I _VD to generate a first synthesized image I _V1 , and also synthesizes a plurality of second overhead images I _VE , I _VF , I _VG . Thus, the same can be applied to the generation of the second composite image _IV2 .

  As mentioned above, although the Example of this invention was explained in full detail with drawing, since an Example is only an illustration of this invention, this invention is not limited only to the structure of an Example. Of course, changes in design and the like within a range not departing from the gist are included in the present invention.

10 towing vehicle 12 first surrounding monitoring unit 12a front camera (imaging unit)
12b Left side camera (imaging part)
12c Rear camera (imaging part)
12d Right side camera (imaging part)
14 Traction vehicle side connection part 16 1st camera ECU
16a Image input unit 16b Image conversion unit 16c Image composition unit 17a Traction vehicle information storage unit (first information storage unit)
18a Information reception unit 20a Posture detection unit 22a Connection detection unit 24a Tire turning angle detection unit 26a Image display unit 28a Image boundary position calculation unit 28b Predicted course calculation unit 28c Tire direction calculation unit 30 Towed vehicle 32 Second surrounding monitoring unit 32a Left side Camera (imaging part)
32b Rear camera (imaging part)
32c Right-side camera (imaging part)
34 Towed vehicle side connecting portion 36 Second camera ECU
36a Image input unit 37a Towed vehicle information storage unit (second information storage unit)
38a Information transmission unit 50 CAN communication line 100 Traction vehicle perimeter monitoring device

Claims (8)

A towing vehicle having a first surrounding monitoring unit comprising a plurality of imaging units around the vehicle body;
A towed vehicle towed by being connected to the towed vehicle and having a second surroundings monitoring unit comprising a plurality of imaging units around the vehicle body;
An information storage unit storing each installation position, each installation direction, each calibration data of the plurality of imaging units included in the tow vehicle and the towed vehicle, and a connection position of the towed vehicle and the towed vehicle;
A connection detector that detects that the tow vehicle and the towed vehicle are connected;
An attitude detector that detects an attitude of the towed vehicle with respect to the tow vehicle;
A tire direction calculation unit for calculating the direction of the front wheels of the tow vehicle;
A predicted route calculation unit that calculates a predicted route of the tow vehicle and the towed vehicle;
A plurality of images taken from the first virtual viewpoint, based on the installation positions, the installation directions, and the calibration data of the plurality of imaging units included in the first circumference monitoring unit. Are converted into the first bird's-eye view image, and each image captured by the second surrounding monitoring unit is based on each installation position, each installation direction, and each calibration data of the plurality of imaging units included in the second surrounding monitoring unit. An image conversion unit for converting into a plurality of second overhead images viewed from the second virtual viewpoint;
An image synthesis unit that synthesizes the plurality of first bird's-eye images and the plurality of second bird's-eye images into a single synthesized image at a connection position of the tow vehicle and the towed vehicle;
An image display unit that displays the composite image at a position that is visible to the driver of the tow vehicle, and when the connection detection unit detects the connection between the tow vehicle and the towed vehicle, The image conversion unit generates a plurality of the first bird's-eye images and a plurality of the second bird's-eye images, and the image synthesis unit generates the synthesized image based on the posture detected by the posture detection unit, A tow vehicle surroundings monitoring device that superimposes the direction of the front wheel of the tow vehicle, the towed vehicle, and the predicted course of the towed vehicle on the composite image and displays them on the image display unit. The towed vehicle has a second information storage unit that stores each installation position, each installation direction, each calibration data, and a connection position with the tow vehicle of the plurality of imaging units included in the second surrounding monitoring unit;
An information transmission unit that transmits each image captured by the second surrounding monitoring unit and information stored in the second information storage unit to the tow vehicle,
The tow vehicle has a first information storage unit that stores each installation position, each installation direction, each calibration data, and a connection position with the towed vehicle of the plurality of imaging units included in the first surrounding monitoring unit;
An information receiving unit for receiving information transmitted from the information transmitting unit;
A plurality of first overhead images are generated based on each installation position, each installation direction, and each calibration data of the plurality of imaging units included in the first surrounding monitoring unit, and the plurality of imaging units included in the second surrounding monitoring unit An image conversion unit that generates a plurality of the second overhead images based on each installation position, each installation direction, and each calibration data;
Based on each installation position, each installation direction, and each calibration data of the plurality of imaging units included in the first surrounding monitoring unit, a plurality of the first overhead images are synthesized into one first synthesized image, and the second surroundings Based on each installation position, each installation direction, and each calibration data of the plurality of imaging units included in the monitoring unit, the plurality of second overhead images are combined into one second composite image, and further, the tow vehicle and the An image composition unit configured to compose the first composite image and the second composite image into a single third composite image based on the connection position of the towed vehicle and the posture detected by the posture detection unit; And
When the connection detection unit detects the connection between the tow vehicle and the towed vehicle, the information reception unit receives information transmitted from the information transmission unit, and the image conversion unit includes a plurality of the first conversion units. The tow vehicle periphery monitoring device according to claim 1, wherein an overhead image and a plurality of the second overhead images are generated, and the image synthesis unit generates the third synthesized image. The towed vehicle includes an identification information storage unit that stores identification information that identifies the towed vehicle, each image captured by the second surrounding monitoring unit, and identification information stored in the identification information storage unit, respectively. An information transmission unit for transmitting to the tow vehicle,
The tow vehicle has a first information storage unit that stores each installation position, each installation direction, each calibration data, and a connection position with the towed vehicle of the plurality of imaging units included in the first surrounding monitoring unit;
An information receiver for receiving information transmitted from the transmitter;
Identification information for identifying a plurality of towed vehicles connected to the tow vehicle, each installation position, each installation direction, each calibration data of each of the plurality of imaging units each of the plurality of towed vehicles, and a plurality of the tow vehicles A third information storage unit storing a connection position with each of the towed vehicles;
A plurality of first overhead images are generated based on each installation position, each installation direction, and each calibration data of the plurality of imaging units included in the first surrounding monitoring unit, and the plurality of imaging units included in the second surrounding monitoring unit An image conversion unit that generates a plurality of the second overhead images based on each installation position, each installation direction, and each calibration data;
Based on each installation position, each installation direction, and each calibration data of the plurality of imaging units included in the first surrounding monitoring unit, a plurality of the first overhead images are synthesized into one first synthesized image, and the second surroundings Based on each installation position, each installation direction, and each calibration data of the plurality of imaging units included in the monitoring unit, the plurality of second overhead images are combined into one second composite image, and further, the tow vehicle and the An image composition unit configured to compose the first composite image and the second composite image into a single third composite image based on the connection position of the towed vehicle and the posture detected by the posture detection unit; And
When the connection detection unit detects the connection between the tow vehicle and the towed vehicle, the information reception unit receives information transmitted from the information transmission unit, and the image conversion unit is based on the identification information. Identifying the towed vehicle connected to the tow vehicle and generating a plurality of the first overhead images and a plurality of the second overhead images, and the image composition unit generates the third composite image. The tow truck surroundings monitoring device according to claim 1.   The image synthesis unit detects an overlapping imaging area where the same position is imaged from the first synthesized image and the second synthesized image, and in the detected overlapping imaging area, the first imaging image 4. The tow vehicle surrounding monitoring according to claim 2, wherein information captured at a higher resolution among the surrounding monitoring unit and the second surrounding monitoring unit is reflected in the third composite image. 5. apparatus.   The image synthesizing unit reflects an image captured from a closer location of the first surrounding monitoring unit and the second surrounding monitoring unit in the overlapped imaging region in the third synthesized image. The surrounding monitoring device for a tow vehicle according to claim 4.   The third composite image is a position indicating a connection position with the towed vehicle in the first composite image arranged at the same position in the same direction, and the tow vehicle in the second composite image. The position indicating the connection position is matched, and the second synthesized image is further synthesized by rotating by an amount corresponding to the attitude detected by the attitude detection unit. The surroundings monitoring apparatus for tow vehicles of any one of Claim 5.   The tow vehicle surroundings monitoring device according to claim 6, wherein the first composite image is arranged in a direction in which a front side of the tow vehicle is located at an upper part.   When the connection detection unit detects the connection between the towed vehicle and the towed vehicle, among the plurality of imaging units of the first surrounding monitoring unit, the surrounding of the towed vehicle is behind the towed vehicle. The tow vehicle periphery monitoring device according to any one of claims 1 to 7, wherein an output of an imaging unit that is in a state where monitoring is impossible is not used.