KR-20260063044-A - CCTV Camera Lighting systems

Abstract

The device according to the present embodiment relates to a method for turning on/off lighting for a CCTV (Closed Circuit TV) camera in accordance with the opening time of the CCTV camera's shutter, and a lighting control device and a lighting system for a closed-circuit television camera. CCTV cameras require illumination only during the exposure time of the image sensor (CCD: Charge Coupled Device or CMOS: Complementary Metal Oxide Semiconductor) to acquire images. Exposure of the image sensor is achieved by opening and closing the "SHUTTER," and the opening and closing time (SHUTTER SPEED) is set so that the SHUTTER is opened only during this time to expose it to light. A CCTV camera with a shutter speed of 1/1000th of a second opens the shutter for only 1/1000th of a second (1ms) to acquire one image, so the light also only needs to be turned on for 1ms. Since CCTV cameras acquire 30 frames per second, the time required to open the shutter per second is 30 frames * shutter speed 1/1000 = 30/1000 (30ms), so only 30ms out of 1000ms is required. Therefore, if the lights can be turned on and off only during the shutter opening time, the lifespan of the lights can be extended by tens of times compared to general lighting, and the energy required for lighting can also be significantly saved. Accordingly, the present invention, derived from this idea, relates to a lighting system for a closed-circuit television camera that turns the light on and off only during the shutter opening time of the CCTV camera.

Inventors

• 진수태

Assignees

• 주식회사 더케이

Dates

Publication Date

20260507

Application Date

20241030

Claims (2)

1. Lighting device; A terminal capable of receiving a VIDEO SIGNAL from a CCTV camera; An extraction unit that extracts an EVEN/ODD FIELD PULSE from a VIDEO SIGNAL received from the above terminal; Using the rising and falling edges of the EVEN/ODD FIELD PULSE extracted from the above extraction unit as reference signals, lighting The process of calculating the timing for turning on and off; Through the above calculation process, the lighting device corresponds to the opening of the CCTV camera shutter. A lighting device that controls ON/OFF; and A lighting system for a closed-circuit television camera, characterized by comprising: a server for operating and controlling the above-mentioned CCTV camera and lighting device; wherein the lighting device includes a terminal capable of receiving a VIDEO SIGNAL from the CCTV camera.
2. In Article 1, EVEN/ODD FIELD from the VIDEO SIGNAL received from the above terminal Extraction unit for extracting PULSE; A process of calculating the timing for turning the light on and off using the rising edge and falling edge of the EVEN/ODD FIELD PULSE extracted from the extraction unit as reference signals; and A processor for generating a control signal for a lighting device at the time of turning the light on and off obtained in the above calculation process; and A lighting system for a closed-circuit television camera characterized by being configured to include a communication unit for communication with the above-mentioned server.

Description

Lighting systems for closed-circuit television cameras {CCTV Camera Lighting systems} This embodiment relates to a lighting system for a closed-circuit television camera that turns the light on and off only during the shutter opening hours of the CCTV camera. Many high-efficiency, low-power consumption lighting fixtures have been developed and are being used as lighting for CCTV cameras, and there is currently a trend toward replacing them with LED lighting fixtures. Furthermore, the general method would be to operate lighting independently of CCTV cameras by continuously turning it on when needed. However, such lighting has limitations in reducing energy consumption and providing an abundant light source. Due to the fast response of LED lighting that is widely used recently, depending on the operating method, a method of continuously flowing current to turn it on and a PWM (Pulse Width Modulation) method that repeatedly turns it on and off are used. Using these methods, the lighting must be operated in accordance with the CCTV camera shutter opening time, but various problems arise. First, the CCTV camera does not notify any external equipment of the shutter opening time. Second, the lighting cannot indicate the CCTV camera's shutter opening time. Third, the shutter opening time cannot be determined without affecting the external appearance of the CCTV camera (modification, deformation, etc.). Accordingly, the present invention relates to a lighting system for a closed-circuit television camera that easily links with the shutter without affecting the CCTV camera to turn the lighting on and off only during the shutter's opening hours. [Fig. 1] Time relationship when SHUTTER SPEED is 1/1000. [Fig. 2] Connection and configuration diagram of a lighting control device for a CCTV camera Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that in assigning reference numerals to the components of each drawing, the same components are given the same reference numeral whenever possible, even if they are shown in different drawings. Furthermore, in describing the embodiments of the present invention, if it is determined that a detailed description of related known components or functions would hinder understanding of the embodiments of the present invention, such detailed description is omitted. In addition, terms such as first, second, A, B, (a), (b), etc. may be used when describing the components of the embodiments of the present invention. These terms are used merely to distinguish the components from other components, and the essence, order, or sequence of the components is not limited by the terms. In addition, where it is stated that a component is "connected," "combined," or "joined" to another component, it should be understood that while the component may be directly connected or joined to the other component, another component may also be "connected," "combined," or "joined" between each component. The present invention relates to a method for turning a light on and off during the opening time of a CCTV camera shutter and a lighting control device. The shutter opening time of the CCTV camera is determined by the shutter speed and is repeated 30 times per second (to acquire 30 images). Therefore, the present invention turns the light on and off using the shutter opening time that is repeated 30 times per second. However, generally, CCTV cameras use one of two methods, progressive scan or interlaced scan, to acquire a single image, and most analog CCTV cameras use the interlaced scan method, while digital CCTV cameras use the progressive scan method. The present invention relates to a method for turning on and off the lighting of an analog CCTV camera, specifically an interlaced scanning camera. The interlaced scanning method requires two scanning processes to acquire one image, and also requires opening the shutter twice. The video signal of a CCTV camera is called COMPOSITE VIDEO SYNC, which means that various signals are mixed together in the video signal. This signal includes COMPOSITE SYNC, synchronization signals (horizontal synchronization signal: H-SYNC, vertical synchronization signal: V-SYNC), ODD/EVEN FIELD PULSE, BURST/BACK PORCH SYNC, etc., and is used according to its respective purpose. The present invention relates to a lighting system for a closed-circuit television camera that uses an ODD/EVEN FIELD PULSE included in COMPOSITE SYNC as an ON/OFF switch for lighting in order to turn the lighting on and off during the shutter opening time of the CCTV camera. CCTV cameras using the interlaced scanning method perform odd-line scanning and even-line scanning to acquire a single image, and shutter opening also occurs twice for each. The ODD/EVEN FIELD PULSE is generated in a HIGH (+5V) state when scanning odd scan lines and in a LOW (0V) state when scanning even scan lines. More specifically, in a CCTV camera u