CN105842682A - Vehicle safety interval detection system - Google Patents

Abstract

The invention relates to a vehicle safety interval detection system. The system comprises a laser emitting head, a high-definition pick-up head and a real-time calculation chip, wherein the emission direction of the laser emitting head is parallel to the optical axis of a lens of the high-definition pick-up head, a signal output port of the high-definition pick-up head is connected with the real-time calculation chip through electric signals, and the real-time calculation chip receives image signals transmitted by the high-definition pick-up head in real time and then calculates and outputs a distance measurement value according to a given formula. The vehicle safety interval detection system is quite simple from material selection to manufacturing, and is low in production difficulty, low in cost, simple in product structure and good in application effect (high distance measurement accuracy and quite low misjudgment rate, there having promotion and application prospect.

Description

Vehicle safety detecting for spaces system

Technical field

The present invention relates to a kind of vehicle safety detecting for spaces system, be a kind of range unit.

Background technology

Radar system is traditional distance detector, and employing electromagnetic wave is detection means.Radar system Application is the detection of large-scale dimension target.For in the detection application of ground object, ground thunder Reaching and can form near-earth blind area under the interference of ground-reflected wave, the object being in blind area is difficult to by ground thunder Reach and detect.The approach overcoming near-earth blind area at present has two kinds, a kind of spatial altitude being to improve radar, The i.e. utilization of early warning plane；Another kind is to shorten electromagnetic wavelength, is reduced to millimeter wave from metric wave, but wavelength What shortening brought is the significant increase of technical difficulty.Along with the development of automotive is with universal, low coverage Active probing technique to guarantee the importance of daily traffic safety and necessity with time all increase.In daily traffic Distance between vehicle is several meters to tens meters, and height of car is meter level, and electromagnetic wave detection is set by these 2 Put the highest technical threshold；Military radar technical costs is expensive, is difficult to be generalized to civil area；Ultrasonic Ranging technology is similar with Radar Technology, and difference is that detection means is ultrasound wave, due to the biography of ultrasound wave Broadcasting speed and be all far below electromagnetic wave far below electromagnetic wave, its frequency and wavelength, this feature makes ultrasound wave visit Survey technology is suitable for the detection of ground object, but is generally only used for the reverse radar system of automobile.

Summary of the invention

The technical problem to be solved in the present invention is: at present due to technology with become present aspect, cause Front truck range-measurement system is installed on civilian vehicle and implements that difficulty is big, Difficulty, provide for this one to become specially This is cheap, technical difficulty is low, the vehicle safety detecting for spaces system that using effect is good, to solve problem, Meet application required.

The technical solution adopted for the present invention to solve the technical problems is: a kind of vehicle safety detecting for spaces system System, includes laser beam emitting head, high-definition camera and real-time computing chip, the launch party of laser beam emitting head Parallel to the optical axis of the lens with high-definition camera, the signal output of high-definition camera with calculate core in real time The sheet signal of telecommunication connects, and the definition testee distance away from high-definition camera is L, and laser beam emitting head is away from high definition The distance of the lens axis of photographic head is H, and the focal length of lens is f, and testee is shone by laser beam emitting head Penetrating formed hot spot image patch in high-definition camera to the pixel unit distance of lens axis is PPI, The picture signal that computing chip real-time reception high-definition camera transmits in real time, by testee by Laser emission Head irradiates the formed laser spot image patch in the high-definition camera pixel unit distance turn to lens axis Turn to long measure distance h, according still further toFormula calculate with output L numerical value.

The invention has the beneficial effects as follows: this vehicle safety detecting for spaces system makes the simplest from drawing materials to Just, production difficulty is low, with low cost, product structure is simple, using effect good (ranging accuracy height, False Rate is extremely low), great promote the use of prospect.

Accompanying drawing explanation

The invention will be further described with embodiment below in conjunction with the accompanying drawings.

Fig. 1 is the structural representation (in figure, arrow represents light path) of the present invention.

In figure: 1. laser beam emitting head 2. high-definition camera 2-1. lens 3. calculate core in real time Sheet

Detailed description of the invention

A kind of vehicle safety detecting for spaces system, as it is shown in figure 1, it includes laser beam emitting head 1, height Clear photographic head 2 and in real time computing chip 3, transmitting direction and the high-definition camera 2 of laser beam emitting head 1 The optical axis of lens 2-1 is parallel, the signal output of high-definition camera 2 and real-time computing chip 3 signal of telecommunication Connecting, the definition testee distance away from high-definition camera 2 is L, and laser beam emitting head 1 is away from high-definition camera The distance of the lens 2-1 optical axis of 2 is H, and the focal length of lens 2-1 is f, and testee is sent out by laser Penetrate a 1 formed laser spot image patch in high-definition camera 2 of the irradiation pixel list to lens 2-1 optical axis The distance of positions from for PPI, the picture signal that real-time computing chip 3 real-time reception high-definition camera 2 transmits, will Testee is irradiated formed hot spot image patch in high-definition camera 2 to lens by laser beam emitting head 1 The pixel unit distance of 2-1 optical axis is converted into long measure distance h, according still further toFormula meter Calculate and the numerical value of output L.

This vehicle safety detecting for spaces system is generally mounted to the Herba Plantaginis position of vehicle, its range finding to front truck Principle is as follows: according to convex lens imaging principle, the measured object distance away from high-definition camera 2 is saturating much larger than it During the focal length of mirror 2-1, the imaging plane infinite tendency focal plane of high-definition camera 2, now can approximate and recognize Overlapping with focal plane for imaging plane, the image space of measured object can be directly with through lens 2-1 photocentre Ray determines with the focus of focal plane, as it is shown in figure 1, A point represents measured object Stimulated Light irradiates formation Hot spot, B point represents hot spot through lens 2-1 imaging (on focal plane) in high-definition camera 2, O point is lens 2-1 photocentres, and F point is lens 2-1 focuses, closes according to the corresponding ratio of similar triangles , there is this relational expression in system:

$\frac{OC}{AC}=\frac{OF}{BF}$

In formula, OC is testee distance L away from high-definition camera 2, and AC is laser beam emitting head 1 away from height Distance H of the lens 2-1 optical axis of clear photographic head 2, OF is lens 2-1 focal distance f, and BF is tested Object is irradiated formed hot spot image patch in high-definition camera 2 to lens 2-1 by laser beam emitting head 1 Distance h of optical axis, therefore has a relational expression:

$\frac{L}{H}=\frac{f}{h}$

Then have

Such then can get the numerical value (measured object distance away from high-definition camera) of L, namely front truck and this car Spacing.

During calculating at this, H Yu f is known parameters, and the length of only h is to need to measure in real time , but the length of h can not directly be measured, and must be by the real-time computing chip 3 high-definition camera to receiving 2 picture signals transmitted process, and by laser beam emitting head 1, testee is irradiated formed light Speckle image patch in high-definition camera 2 converts to the pixel unit distance of lens 2-1 optical axis, just may be used Obtain the numerical value of the h of long measure.Certainly, pixel unit numerical value is converted into the skill of long measure numerical value Art is prior art, known in the industry.

Above-described embodiment is only used for illustrating the present invention, rather than the restriction to rights protection of the present invention is all It is the change of any unsubstantiality carried out on the basis of essence scheme of the present invention, the present invention all should be fallen into Protection domain in.

Claims (1)

1. a vehicle safety detecting for spaces system, it is characterised in that: include laser beam emitting head (1), High-definition camera (2) and in real time computing chip (3), the transmitting direction of laser beam emitting head (1) and high definition The optical axis of the lens (2-1) of photographic head (2) is parallel, the signal output of high-definition camera (2) with Computing chip (3) signal of telecommunication connects in real time, and the definition testee distance away from high-definition camera (2) is L, the distance of the laser beam emitting head (1) lens (2-1) optical axis away from high-definition camera (2) is H, thoroughly The focal length of mirror (2-1) is f, and testee is irradiated the hot spot formed at height by laser beam emitting head (1) Image patch in clear photographic head (2) is PPI to the pixel unit distance of lens (2-1) optical axis, counts in real time Calculate the picture signal that chip (3) real-time reception high-definition camera (2) transmits, by testee by laser Emitting head (1) irradiates formed laser spot image patch in high-definition camera (2) to lens (2-1) The pixel unit distance of optical axis is converted into long measure distance h, according still further toFormula calculate with The numerical value of output L.