Every surveillance camera system needs an image sensor to create a video. An image sensor is the part of a security camera that captures the light hitting the camera lens and converts it into electrical signals. It is a chip made up of millions of light-sensitive components (photodiodes or phototransistors) that capture the projected waves of a lens, which makes up the image. Image sensors can be used in devices, such as digital/security cameras, medical and vision equipment. Image sensors range in size, but the most common are 1/2.8″ and 1/3″. The image sensor dimension impacts the security camera's field of view for a given lens as well as the light sensitivity.
When a video camera is manufactured, there are two main technologies that can be used for the image sensor: CCD (Charged Coupled Device) and CMOS (Complementary Metal-Oxide Sensor). CCD and CMOS image sensors are two different technologies for capturing images digitally. Both types of imagers convert light into electric charge and process it into electronic signals. While CCD and CMOS sensors are often seen as rivals, each has unique strengths and weaknesses that make it appropriate for different security cameras applications.
CCD stands for Charge Coupled Device and is one of the oldest image-capture technologies used on surveillance cameras. CCD image sensors have been around for over 30 years, and are often found in older models of cameras. The image quality in an CCD image sensor is good because it produces less noise and better sensitivity than in a CMOS image sensor. However, the only disadvantage is its heavy circuitry which is required outside the sensors for conversion and amplification and need heavy power consumption. CCD sensors are more expensive and more complex to incorporate into a security camera. The increase power consumptions may sometimes result in issues like excessive heat generation within the CCTV camera. A CCD sensor can consume up to 100 times more energy than an equivalent CMOS sensor. CCD sensors are also more expensive and more complex to incorporate into a security camera.
CMOS stands for Complementary Metal-Oxide Semiconductor, also known as active-pixels sensors. Instead of using analog methods to turn light into data, CMOS image sensor make use of transistors situated at each pixel to capture and transform light. This is a much more flexible way to take digital images as each pixel has its own individual transistor path. Additionally, with a CMOS image sensor created in the same way that microchips are, they’re easier to produce using traditional manufacturing methods. This makes CMOS image sensor cheaper to make – and is why IP security cameras are much more affordable now than they were in the past. Most security camera system use a CMOS image sensor, because CMOS image sensor perform better than CCDs, offering faster speeds with lower power consumption. Since CMOS image sensor don’t require a separate image processor like CCD sensors do, they require a lot less power. In comparison with CCDs, a CMOS image sensor have a faster readout (which is advantageous when high-resolution images are required), higher immunity to image noise, lower power dissipation at the chip level, a smaller system size, enable more integration possibilities and more functions.
Image sensors are used primarily in security cameras and in a large number of imaging devices used in industrial, media, medical and consumer applications. CMOS image sensors & and CCD image sensors are widely used in camera modules, camcorders, smart phones, PC cameras, personal digital assistants (PDAs), machine vision, and videoconferencing. Image sensors are also being widely used among toys, games, optical mouse, document scanning, barcode readers and scientific imaging.
CMOS image sensors, and CCD image sensors, are one of the many factors to consider when looking to purchase a security camera. Do you have any questions or would you like to learn more about CMOS image sensors? Contact Dicsan Technology today! Our team of knowledgeable security advisors will be more than happy to answer your questions or provide you with more information regarding image sensors and security cameras.
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