1.An image sensor or imaging sensor is a sensor that detects and conveys the information that constitutes an image. It does so by converting the variable attenuation of light waves (as they pass through or reflect off objects) into signals, small bursts of current that convey the information.
2. The waves can be light or other electromagnetic radiation. Image sensors are used in electronic imaging devices of both analog and digital types, which include digital cameras, camera modules, medical imaging equipment, night vision equipment such as thermal imaging devices, radar, sonar, and others.
3.There are many parameters that can be used to evaluate the performance of an image sensor, including dynamic range, signal-to-noise ratio, and low-light sensitivity. For sensors of comparable types, the signal-to-noise ratio and dynamic range improve as the size increases.
4. Bayer filter sensor, low-cost and most common, using a color filter array that passes red, green, and blue light to selected pixel sensors. Each individual sensor element is made sensitive to red, green, and blue by means of a color gelmade of chemical dye placed over each individual element.
5. Foveon X3 sensor, using an array of layered pixel sensors, separating light via the inherent wavelength-dependent absorption property of silicon, such that every location senses all three color channels. This method is similar to how color film for photography works.
6. 3CCD, using three discrete image sensors, with the color separation done by a dichroic prism. The dichroic elements provide a sharper color separation, thus improving color quality. Because each sensor is equally sensitive within its passband, and at full resolution, 3-CCD sensors produce better color quality and better low light performance.
7. Special sensors are used in various applications such as thermography, creation of multi-spectral images, video laryngoscopes, gamma cameras, sensor arrays for x-rays, and other highly sensitive arrays for astronomy.
8. The digital image sensor is a technology used to record electronic images. These image sensors are silicon microchips that are engineered to operate in different ways. The engineering involved in these circuits is very complex and the techniques used to manufacture these devices are not standardized in the industry.
9. The presence of image sensors in everyday objects is already a reality and there is no indication that the industry will stop growing. The CCD market has been around for a long time, and CMOS image sensors are a hot new technology that will allow for even wider use of image sensors.
10. image sensors may play an important part in allowing robotic systems to interact more directly with human beings. The possibility of cameras being included in every electronic device that has any circuitry at all becomes more reasonable as the technology gets smaller and cheaper.
