CN101304515A

CN101304515A - Panorama type reverse guidance system

Info

Publication number: CN101304515A
Application number: CNA2007101062378A
Authority: CN
Inventors: 徐世刚
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-05-11
Filing date: 2007-05-11
Publication date: 2008-11-12

Abstract

The invention relates to a backup guidance system which allows the drivers to see the images of other vehicles and the surrounding environment behind the vehicle as well as the relative moving situation thereof from an inside display screen. The backup guidance system comprises cameras installed on the left and right sides of the vehicle and at the tail of the vehicle, a backup radar at the rear of the vehicle, an image splicing device, a liquid crystal display (LCD), and the like, wherein, the image splicing device comprises a microcontroller, an image splicing program, a backup switch, a memory, etc. The image splicing device splices the images collected by the cameras installed on the two sides of the vehicle, the images collected by the camera installed at the tail of the vehicle, and the vehicle appearance images pre-stored in the image splicing device into a complete panorama displayed on the multimedia display screen in the cab, and the backup radar marks the measured distance signal processed by the image splicing device in form of scale between the automobile tail and the obstacles displayed on the multimedia display screen. Therefore, when backing, the driver can see not only other vehicles and the surrounding environment, but also the relative moving situation thereof on the display screen, and can back the vehicle well only by concentrating on the display screen without turning round to see the situation behind the vehicle. The backup guidance system leads the backup to be safe and convenient.

Description

Panorama type reverse guidance system

Affiliated technical field:

A kind of safe guiding device when the present invention relates to reversing automobile provides the pilot signal and the device of control vehicle operating intuitively automatically especially can for the reversing driver.

As everyone knows, at present the reversing guiding device of automobile is a lot, gets up to have two kinds but conclude, and a kind of is radar for backing car, when vehicle body can provide alarm signal to the driver during near barrier; Another kind is that display system is induced in reversing, it with tailstock video camera take the photograph picture, the safe distance of rear view of vehicle--information such as car width of cloth extended line-anticipation route and stop line are presented on the interior multimedia display screen of driver's cabin.Radar for backing car only is a kind of passive reversing safety device, and the guiding function during to reversing is also little.Though reversing induce display system than radar for backing car progress many, but weak point is arranged also, the image that one shows has only the scenery picture behind the car, do not have car scenery picture on every side, there is not a width of cloth panorama sketch, lack the sense of reality, ambient conditions also has certain difficulty after depending display screen alone understand car concerning the driver, it two is car images in scenery not in the image that display screen shows, do not see the car and the relation of scenery on every side, relative displacement, the driver had to see display screen on one side when the result moveed backward, Yi Bian after later looking out for the car, the danger when having increased reversing so on the contrary.

Summary of the invention

For overcoming the deficiency of existing reverse guidance system, the invention provides a kind of reverse guidance system, it can be presented on the display screen by the panorama sketch that the environment structure behind car both sides and the car is realistic, the image that car is arranged at this width of cloth panorama sketch, can therefrom see relation, the relative displacement of car and surrounding environment, after the driver just needn't later look out for the car when moveing backward like this, being absorbed in display screen just can be good with car, convenience and fail safe when improving reversing.

The technical scheme that technical solution problem of the present invention is adopted is: native system is made up of three cameras, image splicer, radar for backing car, image display.A camera is respectively arranged in the rearview mirror of car both sides, at the tailstock camera and a range radar are arranged, three cameras are taken the photograph to such an extent that the signal of image is delivered in the image splicer outline drawing picture of the width of cloth automobile that also prestored in the image splicer in addition.This four width of cloth image looks like to connect device through picture mosaic and is spliced into the multimedia display screen that a realistic panorama sketch is presented at driver's cabin.The image splicer is made of microprocessor (CPU), A/D and D/A converter, reversing switch, memory and merging algorithm for images program.Range radar is changed the distance signal between vehicle and the barrier in the microprocessor of delivering in the image splicer through A/D, can be after microprocessor processes with the distance of car and barrier with between the vehicle and barrier in the form mark panorama sketch of scale, and can give warning in advance and allow the driver perform brake to prepare, perhaps in time slow down or brake by the notice of the network-bus in car car central control system.The merging algorithm for images program is based on image pixel similitude and correlation design.The both sides camera is taken the photograph picture has lap with the picture that tailstock camera is taken the photograph respectively.The picture that the camera of both sides is taken the photograph the scenery behind the other and car, also should comprise the part picture of vehicle body side except car, and these pictures have the part of negative lap mutually with body contour figure in being pre-stored in the image splicer.When making panorama sketch, earlier the both sides camera is clapped to such an extent that picture and tailstock camera are clapped to such an extent that the relevant overlapping part in the picture is stitched together, again the both sides camera is clapped picture be stitched together with relevant overlapping part among the contour of the vehicle figure that prestores, in addition digitlization correction is then just finished a width of cloth panorama sketch and is made.The image splicer is sent to image display with the panorama sketch of making and shows after the D/A conversion.Since camera take the photograph the relative surrounding environment of picture of car side be movable, so can see car moving in the panorama sketch from display screen during reversing relative to surrounding environment.Open reversing switch during reversing, system just starts working, and reversing switch can manually also can be automatic, and automatic switch links with reverse gear.

The invention has the beneficial effects as follows, when the driver moves backward, from display screen, just can know the scenery seen around the car and the car situation of movement the environment around, and car and car and obstruction apart from situation, like this driver just needn't later look out for the car the back be absorbed in display screen just can be good car.

Description of drawings

The present invention is further described below in conjunction with drawings and Examples

Fig. 1 is a theory structure block diagram of the present invention

LPC2364 is 32 single-chip microcomputers of PHILIPSLPC2100 series, includes 10 A/D and D/A converter, USB and CAN bus interface, dominant frequency 70MHZ.

LCD is a LCD

W is a ultrasonic range finder

L, R, M are respectively the digital camera heads of the band USB interface of the vehicle right and left side and the tailstock.

HUB is a usb hub.

U is the USB flash disk memory

K is a reversing switch

Fig. 2 is that camera and ultrasonic wave side are apart from the distribution map of instrument on vehicle body

(1) be left-hand mirror, (2) are right back visors, and (3) are the tailstock, and (4) are headstocks

L, R, M are respectively the left, center, right cameras

W is a ultrasonic range finder

Embodiment

In Fig. 1, LPC2364 is the AMR Series chip, dominant frequency 70MHZ.Include 10 A/D, D/A converter, usb bus and CAN bus control unit conveniently are connected with USB device and automotive networking bus.The digital camera head of three band USB interface is installed in respectively among the left-hand mirror (1) of automobile, right back visor (2) and the tailstock, is connected with the U mouth of LPC2364 by hub (HUB).Ultrasonic range finder (W) is installed in the tailstock, is connected with the A/D mouth of LPC2364, and the A/D converter of LPC2364 becomes digital signal to offer the CPU of LPC2364 the simulated range conversion of signals that records of ultrasonic range finder (W).The USB flash disk memory also is connected by the U mouth of hub (HUB) and LPC2364, and its capacity is very big, is mainly used to store the digital video signal of three camera collections, and has gathered the contour of the vehicle picture signal in advance.Reversing switch (K) can be manual, also can be automatically, if allow reverse gear interlock in it and the clutch automatically, the I/O of it and LPC2364 is connected.LT117L-3.3 is a three terminal regulator, and it is exported automobile 12V dc voltage stability at 3.3V, offer single-chip microcomputer and make power supply.

During reversing, reversing switch (K) closure, LPC2364 provides the electric power starting camera for three cameras by the U mouth.The vision signal of three camera collections, deliver to the U mouth of LPC2364 by hub, CPU is stored in the different address locations of USB flash disk respectively with them earlier, call the stitching algorithm program then, relevant portion with this three width of cloth image, and this three width of cloth image be stored in the part that the car conour image is relevant in the memory in advance and splice, be spliced into a complete panoramic image at last, the vision signal that the D/A converter by LPC2364 converts simulation to is delivered to LCD display and is shown.Meanwhile, ultrasonic range finder records the A/D converter of distance signal by LPC2364 between automobile and the barrier and converts digital signal to and offer CPU, and CPU is labeled in it between the automobile tail and barrier in the panorama sketch with the form of scale.When the distance between automobile tail and the barrier is alarmed during less than predetermined value, perhaps the CAN bus interface by LPC2364 connects the central control system that the CAN bus of automobile passes to automobile with signal and allows automobile slow down automatically or brake.

Claims

One kind in car display screen just can see the relatively move reverse guidance system of situation of the image of surrounding environment behind vehicle and the car and they, camera, radar for backing car, image splicer, image display by the left and right vehicle wheel both sides and the tailstock are formed, and it is characterized in that: the image splicer includes micro processor and merging algorithm for images program.
2. reverse guidance system according to claim 1 is characterized in that: the camera of left and right vehicle wheel both sides lays respectively on the rearview mirror of the left and right sides.
3. reverse guidance system according to claim 1 is characterized in that: the image splicer is made up of single-chip microcomputer, merging algorithm for images program, memory, reversing switch.
4. reverse guidance system according to claim 1, it is characterized in that: radar for backing car is positioned at the tailstock, is connected with single-chip microcomputer by A/D converter.
5. reverse guidance system according to claim 1 is characterized in that: the digital camera head of the left and right vehicle wheel both sides and the tailstock is connected with single-chip microcomputer by USB interface.
6. reverse guidance system according to claim 1 is characterized in that: single-chip microcomputer is connected with image display by D/A converter.
7. reverse guidance system according to claim 1 is characterized in that: the image splicer prestores the contour of the vehicle image.