CN107483794B

CN107483794B - High-definition outdoor camera

Info

Publication number: CN107483794B
Application number: CN201710860909.8A
Authority: CN
Inventors: 朱虹斐
Original assignee: Individual
Current assignee: Shenzhen Superelectron Technology Co ltd
Priority date: 2017-09-21
Filing date: 2017-09-21
Publication date: 2021-05-25
Anticipated expiration: 2037-09-21
Also published as: CN107483794A

Abstract

The invention provides a high-definition outdoor camera which comprises a base body connected with a support, wherein a lens is arranged in front of the base body, and a light screen is arranged above the lens; the light screen is composed of a liquid crystal panel; a photoelectric sensor with the same orientation as the lens is arranged beside the lens; the photoelectric sensor is coupled with the control module of the liquid crystal panel, so that the area of the liquid crystal panel displaying black extends forwards from the root part until the lighting intensity of the photoelectric sensor is less than a set value or until the liquid crystal panel displays black. The camera can adaptively weaken the background illumination emitted to the lens, so that the definition of a shot object image and the size of a shooting visual field are kept in an optimal balance state.

Description

High-definition outdoor camera

Technical Field

The invention relates to the field of security monitoring, in particular to an outdoor camera.

Background

For the current outdoor camera, the problem of strong backlight is generally faced, that is, when the direction in which the lens faces has strong background illumination, for example, when the camera just faces the sun, the brightness of the object image shot by the camera is extremely low, the image processing module can only adjust the brightness of the shot image integrally to be high, and the definition of the adjusted image is very limited and even fuzzy. Therefore, a sun shield is generally arranged above a lens of the existing outdoor camera, however, when the sun shield extends forwards for a long time, the visual field of the camera is obviously influenced, and when the length of the sun shield is short, the shielding effect on background light is still weak under many conditions.

Disclosure of Invention

In view of the above problems, an object of the present invention is to provide a high definition outdoor camera capable of adaptively attenuating background illumination toward a lens so as to maintain the sharpness of a photographed object image and the size of a photographing field of view in an optimal balance state.

The first technical scheme adopted by the invention for solving the technical problems is as follows: the high-definition outdoor camera comprises a base body connected with a support, wherein a lens is arranged in front of the base body, and a shading plate is arranged above the lens; the light screen is composed of a liquid crystal panel; a photoelectric sensor with the same orientation as the lens is arranged beside the lens; the photoelectric sensor is coupled with the control module of the liquid crystal panel, so that the area of the liquid crystal panel displaying black extends forwards from the root part until the lighting intensity of the photoelectric sensor is less than a set value or until the liquid crystal panel displays black.

Preferably, the photoelectric sensor is disposed on an upper side of the lens so as not to be blocked by the lens.

The first technical scheme has the beneficial effects that: when the light is weak above the front of the lens, the shading area of the shading plate formed by the liquid crystal panel is adjusted to enable the area extending from the root part to the front to be smaller, so that the visual field of the lens can be enlarged, and when the light is strong and the quality of a shooting picture is influenced, the shading area of the shading plate is increased to ensure the definition of the picture, so that the background light irradiating to the lens is weakened adaptively on the basis of no moving part, and the definition of the shot object image and the size of the shooting visual field are kept in the optimal balance state.

The second technical scheme adopted by the invention for solving the technical problems is as follows: the high-definition outdoor camera comprises a base body connected with a support, wherein a lens is arranged in front of the base body and is coupled with a CCD module and an image processing module in sequence; a light screen is arranged above the lens; the light screen is composed of a liquid crystal panel; the control module of the liquid crystal panel is coupled to the image processing module; the control module enables the area of the liquid crystal panel which is displayed as black to extend forwards from the root part until the brightness of the lower area of the image acquired by the image processing module from the CCD module is stable or the area of the continuous dark area at the upper part of the image exceeds a set value.

Preferably, the base body is further provided with an infrared lamp cap which is consistent with the direction of the lens, and the infrared lamp cap is opened and closed once after the position of the lens is changed every time; and comparing the front and the back of the opening and the closing of the infrared lamp cap by the image processing module, and defining an area with obvious difference in brightness in two images acquired by the CCD module as the lower area.

The second technical scheme has the beneficial effects that: extending a region of the liquid crystal panel displayed as black forward from a root until a luminance of a lower region of an image acquired by the image processing module from the CCD module is stabilized; therefore, the fact that the visual field of the lens can only be influenced if the black area of the liquid crystal panel is enlarged is determined, and the effect on the definition of an object image acquired by the lens is basically avoided; at this time, the sharpness of the shot object image and the shooting view field size can be kept in the optimal balance state.

Drawings

Fig. 1 is a schematic view of a first state of the first high-definition outdoor camera according to the embodiment.

Fig. 2 is a schematic diagram of a second state of the first high-definition outdoor camera according to the embodiment.

Fig. 3 is a schematic diagram of the second embodiment of the high-definition outdoor camera.

Detailed Description

The invention is further illustrated with reference to the following figures and examples:

in the first embodiment shown in fig. 1 and 2, the high-definition outdoor camera comprises a base body 2 connected with a bracket 1, a lens 3 is arranged in front of the base body 2, and a shading plate 4 is arranged above the lens 3; the light screen 4 is composed of a liquid crystal panel; the upper side of the lens 3 is provided with a photoelectric sensor 5 which has the same orientation with the lens 3; the photo sensor 5 is coupled to the control module of the liquid crystal panel, so that the black area of the liquid crystal panel extends forward from the root until the lighting intensity of the photo sensor 5 is less than a set value, or until the whole liquid crystal panel is black (at this time, the light shielding area of the light shielding plate 4 cannot be increased again).

When the light on the front upper side of the lens is weak, the light shading area of the light shading plate 4 formed by the liquid crystal panel is adjusted to enable the area extending from the root part to the front to be small, and the visual field of the lens can be expanded; as shown in fig. 1, when the external light is extremely low, the whole light shielding plate 4 is transparent.

When the quality of the image is influenced by strong illumination, the shading area of the shading plate 4 is increased to ensure the definition of the image; as shown in fig. 2, half of the area of the light-shielding plate 4 is black; therefore, the background illumination emitted to the lens 3 is weakened adaptively without any moving parts, and the definition of the shot object image and the shooting visual field size are kept in an optimal balance state.

In addition to the above first embodiment, the second embodiment of the high definition outdoor camera is as follows: the camera comprises a base body 2 connected with a bracket 1, wherein a lens 3 is arranged in front of the base body 2, and the lens 3 is coupled with a CCD module (not shown) and an image processing module (not shown) in sequence; a light screen 4 is arranged above the lens 3; the light screen 4 is composed of a liquid crystal panel; the control module of the liquid crystal panel is coupled to the image processing module; the control module causes the area of the liquid crystal panel displayed as black to extend forward from the root until the brightness of the lower area of the image acquired by the image processing module from the CCD module, which is mainly composed of the object image area, stabilizes, or the area of the continuous dark area on the upper part of the image exceeds a set value (at which time the field of view has been sacrificed to the maximum).

In the second embodiment, the area where the liquid crystal panel displays black extends forward from the root until the brightness of the lower area of the image obtained by the image processing module from the CCD module is stabilized; therefore, the fact that the visual field of the lens can only be influenced if the black area of the liquid crystal panel is enlarged is determined, and the effect on the definition of an object image acquired by the lens is basically avoided; at this time, the sharpness of the shot object image and the shooting view field size can be kept in the optimal balance state.

In addition, an infrared lamp head with the same direction as the lens 3 can be arranged on the base body 2 in the second embodiment, and the infrared lamp head is turned on and off once after the position of the lens 3 is changed each time; and comparing the front and the back of the opening and the closing of the infrared lamp cap by the image processing module, and defining an area with obvious difference in brightness in two images acquired by the CCD module as the lower area.

Because the object image area faced by the lens 3 can obviously reflect the infrared light of the infrared lamp holder, and the background area, such as sky and long shot, can not reflect the infrared tube; therefore, by opening and closing the infrared lamp cap once, the object image areas in the two images acquired from the CCD module generate obvious brightness difference, and the brightness difference of the background area is very small, so that the object image areas can be accurately identified; therefore, when the brightness of the object image area of the image acquired by the image processing module from the CCD module is stable, the shading area of the shading plate 4 does not need to be increased.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, but rather as the subject matter of the invention is intended to cover all modifications, equivalents and alternatives falling within the spirit and scope of the present invention.

Claims

1. A high-definition outdoor camera comprises a base body (2) connected with a support (1), wherein a lens (3) is arranged in front of the base body (2), and a light screen (4) is arranged above the lens (3); the method is characterized in that: the light screen (4) is composed of a liquid crystal panel; a photoelectric sensor (5) with the same direction as the lens is arranged beside the lens (3); the photoelectric sensor (5) is coupled with the control module of the liquid crystal panel, so that the area of the liquid crystal panel displaying black extends forwards from the root part until the lighting intensity of the photoelectric sensor (5) is less than a set value or until the liquid crystal panel displays black.

2. The outdoor high definition camera of claim 1, wherein: the photoelectric sensor (5) is arranged on the upper side of the lens (3).