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A security camera is a vital component of surveillance infrastructure, particularly within the framework of smart cities where technology is leveraged to improve public safety, governance, health, education, and cyber security. The integration of security cameras into smart cities has transformed urban living by enhancing monitoring, crime prevention, data analysis, and real-time decision-making. Security cameras consist of various technical components that work together to capture, process, store, and transmit visual information. These components determine the effectiveness of the camera in surveillance operations. Components in a Security Camera 1. Image Sensor The image sensor is the heart of a security camera. It captures light and converts it into electronic signals. There are two main types of image sensors: * *CCD (Charge-Coupled Device)*: Offers high-quality image resolution and light sensitivity. * *CMOS (Complementary Metal-Oxide Semiconductor)*: More power-efficient and cost-effective, widely used in modern cameras. Image sensors impact the resolution, low-light performance, and clarity of the footage. 2. Lens The lens focuses light onto the image sensor. It determines the field of view (FOV), focal length, and depth of field. A wide-angle lens captures more area, while a zoom lens is suitable for focusing on specific targets. Some advanced security cameras have varifocal lenses for adjustable zoom and focus. 3. Processor (DSP – Digital Signal Processor) The DSP processes the raw video signal captured by the image sensor. It handles image enhancements, noise reduction, color correction, and compression. Modern processors also support AI features such as motion detection, facial recognition, and license plate recognition, making cameras smarter for urban surveillance. 4. Infrared LEDs (IR LEDs) These are used in night vision cameras to provide visibility in complete darkness. The IR LEDs emit infrared light, which is invisible to the naked eye but can be captured by the image sensor. This enables 24/7 monitoring in areas with little or no lighting. 5. Housing and Mounting Bracket The outer casing of a security camera protects internal components from weather, vandalism, and dust. It is ____ _____ ____ __________ ______ ____ __________.
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