CN211206274U

CN211206274U - Target device for measuring visibility through digital camera

Info

Publication number: CN211206274U
Application number: CN201922293715.1U
Authority: CN
Inventors: 姚国友; 麻锴; 孔诗媛; 李广智; 孙文博; 鲁长海; 孙月; 吴非
Original assignee: Jilin Meteorological Survey Support Center Jilin Meteorological Instrument Measurement And Verification Station
Current assignee: Jilin Meteorological Survey Support Center Jilin Meteorological Instrument Measurement And Verification Station
Priority date: 2019-12-19
Filing date: 2019-12-19
Publication date: 2020-08-07
Anticipated expiration: 2029-12-19

Abstract

The utility model provides a target device of measurement visibility is made a video recording to digit, belong to the measurement visibility technical field of making a video recording to digit, this target device includes the light source, the power supply unit, soft light unit and filtering unit, the light source comprises two L ED light sources that luminance is the same, two L ED light sources are the symmetry and set up in the power supply unit both sides, two L ED light source series connection are supplied power by the power supply unit, the surface coating of power supply unit has the black coating, soft light unit comprises two the flexbile plate that the performance is unanimous, two flexbile plates are located the dead ahead of two L ED light sources respectively, filtering unit comprises the standard filter plate of two known luminousness, be first filter plate respectively, the second filter plate, first filter plate and second filter plate set up respectively in two flexbile plate dead ahead, and all closely laminate with the preceding terminal surface of the flexbile plate that corresponds separately.

Description

Target device for measuring visibility through digital camera

Technical Field

The utility model belongs to the technical field of the visibility is measured in the digital camera shooting, concretely relates to target device of visibility is measured in digital camera shooting.

Background

The digital camera method is a new visibility measuring technology, and the technology adopts an artificial black body or black marker as a target object, a sky area behind the target as a background, calculates the brightness ratio of the target and the background by a digital image technology, and calculates the atmospheric visibility based on the human eye vision contrast threshold principle.

The existing digital camera shooting visibility measuring technology mainly has the following two defects:

first, a black body or black target is assumed to have an intrinsic brightness of zero, thereby omitting an unknown amount in visibility calculation, but in practice the intrinsic brightness of a large volume of an ideal black body is difficult to achieve, so the assumption of a black body target brightness of zero results in a calculation error.

Secondly, the visibility of digital photogrammetry is against the sky, but the image processing algorithm for extracting the background is difficult to realize the applicability of all environments, so that the technology is limited to complex environments.

SUMMERY OF THE UTILITY MODEL

The shortcoming that exists in the measurement visibility technique of making a video recording to current digit, the utility model aims at providing a target device of measurement visibility is made a video recording to digit, according to the luminance contrast principle of the digital method of making a video recording, increases a target object in order to replace the sky background, thereby the known inherent luminance ratio that utilizes two targets can solve the problem that exists among the prior art and reduce calculation error, improves the general suitability that the visibility was measured to the digital method of making a video recording.

The utility model discloses a technical scheme that the realization above-mentioned purpose adopts is that a target device of measuring visibility is made a video recording to digit, its characterized in that includes light source, power supply unit, soft light unit and filtering unit, the light source comprises two L ED light sources that luminance is the same, two L ED light sources set up respectively in the power supply unit both sides, be symmetrical arrangement, and two L ED light sources establish ties each other, L ED light source includes aluminium base board and L ED array, L ED array sets up on the aluminium base board, all L EDs establish ties each other in L ED array, the aluminium base board is laid with L ED array's one side is the front end face, the edge of front end face encircles and is provided with the surrounding edge, power supply unit includes shell body and circuit board, the shape of shell body is the cuboid shape, the surface coating of shell body has the black coating, the circuit board sets up inside the shell body, laid with L ED drive circuit on the circuit board, L ED drive circuit is connected with the light source electricity, be used for supplying power to the light source, power supply unit passes through vertical elevating system and fix on the base, the soft light unit is the soft light board, the quantity of soft light unit is two soft light, the soft light sources, the size of soft light source is two soft light sources and the size of soft light filter, the size of soft light source is the second filter plate is the same with the second light source respectively, the second filter plate is the tight light source respectively, the size of soft light source is corresponding, L, the size of filter plate respectively.

Preferably, the vertical lifting mechanism comprises a guide rod and a sliding block, the bottom of the guide rod is fixed on the base and is vertically arranged with the base; the slider is provided with a through hole for the guide rod to pass through, the slider is sleeved outside the guide rod and can move up and down along the guide rod, the slider and the guide rod are detachably connected through a bolt, and meanwhile, the slider is fixed on the power supply unit.

Preferably, the vertical lifting mechanism is a telescopic rod.

Further, the L ED constant current driving circuit includes a diode D1, a diode D2, a diode D3, a diode D4, a filter capacitor C1, a resistor R1, a resistor R2, and a PT4515C constant current module, a bridge rectifier circuit is formed by a diode D1, a diode D2, a diode D3, and a diode D4, a filter capacitor C1 is connected in parallel with the bridge rectifier circuit to form a unidirectional bridge rectifier capacitor filter circuit, a resistor R1 is connected in parallel with the filter capacitor C1, a PT4515C constant current module, a resistor R2, and a light source are connected in series and then connected in parallel with a resistor R1, one end of a resistor R2 is connected to a REXT reset pin of the PT45 4515C constant current module, and the other end is connected to a ground pin of the PT4515C constant current module.

Through the above design scheme, the utility model discloses following beneficial effect can be brought: the utility model provides a target device of digital camera measurement visibility, according to the luminance contrast principle of digital camera method, increase a target object in order to replace the sky background, utilize the known inherent luminance ratio of two target objects, thereby reduce calculation error, the complex environment suitability of digital camera measurement visibility technique has been improved, can realize quick all-weather visibility measurement in arbitrary place, to emergent speedily carrying out rescue work, the field such as disaster prevention and reduction has the significance, wide market perspective and economic value have.

Drawings

The accompanying drawings, which are described herein, serve to provide a further understanding of the invention and constitute a part of this application, and the exemplary embodiments and descriptions thereof are used to understand the invention without constituting undue limitations of the invention, in which:

fig. 1 is a front view of a target device for measuring visibility by digital camera according to an embodiment of the present invention;

fig. 2 is a top view of a target device for measuring visibility by digital camera according to an embodiment of the present invention;

fig. 3 is a left side view of a target device for measuring visibility by digital camera according to an embodiment of the present invention;

fig. 4 is a circuit diagram of the power supply unit and the light source according to the present invention.

The drawing marks are 1-power supply unit, 2-L ED light source, 3-soft light plate, 4-first filter plate, 5-second filter plate, 6-vertical lifting mechanism, 7-base, 601-guide rod, 602-slide block.

Detailed Description

In order to explain the present invention more clearly, the present invention will be further described with reference to the preferred embodiments and the accompanying drawings. As will be appreciated by those skilled in the art. The following detailed description is intended to be illustrative rather than limiting, and is not intended to limit the scope of the invention. Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. In the description of the present invention, it is to be understood that the terms "first" and "second" are used for descriptive purposes only and that the features defined as "first" and "second" do not denote any order, quantity, or importance, but rather are used to distinguish one element from another.

In the present invention, for convenience of description, the description of the relative positional relationship of the respective members is described based on the layout pattern of the drawings, and the positional relationship of the upper, lower, front, rear, left, right, and the like is determined based on the layout direction of the drawings.

The device comprises a light source, a power supply unit 1, a soft light unit and a light filtering unit, wherein the light source is composed of two ED light sources 2 with the same brightness, the two ED light sources 2 are respectively arranged on the left side and the right side of the power supply unit 1 and are symmetrically arranged, the two 0ED light sources 2 are connected IN series with each other, the 1ED light sources 2 comprise an aluminum substrate and a 2ED array, the 3ED array is arranged on the aluminum substrate, all 5ED IN the 4ED array are connected IN series with each other, one side of the aluminum substrate on which the 6ED array is arranged is a front end face, the edge of the front end face is provided with a surrounding edge IN a surrounding manner, IN the embodiment, the number of 7ED IN the light source is N IN a serial form, namely N8 are respectively 9, ED, PT, 0EDn IN the light source, the power supply unit 1 is a power supply device of the light source, the light source rectifies a stabilized current supplied to the light source through a PT4515, the PT, the power supply unit 1 comprises a cuboid and a rectangular parallelepiped, a light filtering light source, a light filtering and a light source, a light filtering and a light filtering light source, the light source is arranged, the light filtering and a light filtering unit, the light source is connected with a light source, the light filtering and a light filtering unit, the light filtering unit is connected with a light source, the light filtering light source is connected with a light source, the light filtering and a light source, the light filtering light source is connected with a light filtering light source, the light filtering light source is connected with a light filtering light source, the light source is connected with a light filtering light source, the light filtering light source, the light filtering light source is connected IN the light source, the light filtering light source, the light filtering light source is connected with a light filtering light source is set circuit, the light filtering light source is set up-emitting diode is connected IN the light filtering light source is connected IN the light filtering light source light filtering light source light filtering light.

When L ED light source 2 is turned off, it is the daytime mode of the device, and when L ED light source 2 is turned on, it is the night mode.

Taking fig. 2 as an example, if the transmittance of the first filter 4 on the left side is m, and the transmittance of the second filter 5 on the right side is n, the ratio of the intrinsic luminance of the left L ED light source 2 to the intrinsic luminance of the right L ED light source 2 is m/n;

in summary, the brightness contrast method for measuring visibility uses the following formula:

wherein, R is digital camera distance the utility model provides a digital camera shooting measures visibility's target device's distance, G_lL ED light source 2 on the left hand side for digital camera shooting, brightness converted to gray scale value, G_rThe L ED light source 2 on the right side, which was photographed by a digital camera, was brightness-to-gray-scale and V was atmospheric visibility.

The utility model provides a target device of digital camera measurement visibility, according to the luminance contrast principle of digital camera method, increase a target object in order to replace the sky background, utilize the known inherent luminance ratio of two target objects, reduce calculation error, the complex environment suitability of digital camera measurement visibility technique has been improved, can realize quick all-weather visibility measurement in arbitrary place, to emergent speedily carrying out rescue work, the field such as disaster prevention and reduction has the significance, wide market perspective and economic value have.

Claims

1. The target device for measuring visibility through digital camera shooting is characterized by comprising a light source, a power supply unit (1), a soft light unit and a filtering unit, wherein the light source is composed of two L ED light sources (2) with the same brightness, the two L ED light sources (2) are respectively arranged on two sides of the power supply unit (1) and are symmetrically arranged, the two L0 ED light sources (2) are connected in series, the L ED light source (2) comprises an aluminum substrate and a L ED array, the L ED array is arranged on the aluminum substrate, all L ED in the L ED array are connected in series, one surface of the aluminum substrate provided with the L ED array is a front end surface, the edge of the front end surface is provided with a surrounding edge in a surrounding mode, the power supply unit (1) comprises an outer shell and a circuit board, the outer surface of the outer shell is coated with a black coating, the circuit board is arranged inside the outer shell, a L ED driving circuit is arranged on the circuit board, the L ED driving circuit is electrically connected with the light source and is used for supplying power to the light source, the power supply unit (1) is fixed on a base (7) through a vertical lifting mechanism, the soft light filtering mechanism, the soft light source (3), the two filtering units (3) are respectively corresponding to the two ED light sources (3), the two soft light filtering units (3), the two ED light filtering units (3), the two soft light filtering units (3), the two ED light filtering units (3), the two soft light sources are respectively, the same size of the soft light filtering units (3), the soft light filtering unit and the soft light filtering unit (3), the light filtering unit (3).

2. The target device for measuring visibility according to claim 1, characterized in that: the vertical lifting mechanism (6) comprises a guide rod (601) and a sliding block (602), wherein the bottom of the guide rod (601) is fixed on the base (7) and is vertically arranged with the base (7); the slider (602) is provided with a through hole for the guide rod (601) to pass through, the slider (602) is sleeved outside the guide rod (601), the slider can move up and down along the guide rod (601), the slider (602) and the guide rod (601) are detachably connected through a bolt, and meanwhile the slider (602) is fixed on the outer shell of the power supply unit (1).

3. The target device for measuring visibility according to claim 1, characterized in that: the vertical lifting mechanism (6) is a telescopic rod.

4. The digital camera shooting target device for measuring visibility according to claim 1, wherein the L ED constant current driving circuit comprises diode D1, diode D2, diode D3, diode D4, filter capacitor C1, resistor R1, resistor R2 and PT4515C constant current modules, diode D1, diode D2, diode D3 and diode D4 form a bridge rectifier circuit, filter capacitor C1 and the bridge rectifier circuit are connected in parallel to form a unidirectional bridge rectifier capacitor filter circuit, resistor R1 and filter capacitor C1 are connected in parallel, PT4515C constant current module, resistor R2 and the light source are connected in series and then connected in parallel to resistor R1, one end of resistor R2 is connected to a REXT reset pin of the constant current module 4515C, and the other end is connected to a GND ground pin of the constant current module 4515C.