A CMOS sensor or complementary metal-oxide-semiconductor sensor is one kind of electronic chip, used to change the photons into electrons for digital processing. These sensors are mainly used for creating images within digital cameras, digital CCTV cameras & digital video cameras. These electronic chips can also be found in scanners, barcode readers & astronomical telescopes. The low-cost manufacturing of CMOS makes it achievable to generate low-cost consumer devices.

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Active Pixel Sensor is a type of image sensor that is designed with a collection of pixel sensors. In this type of sensor, every pixel sensor includes an amplifier and a photodetector. Out of this active pixel sensor (APS), the CMOS APS is the most famous sensor because of the great applications they have in DSLRs, digital cameras, etc.

CMOS sensor is a digital device where every site includes a photodiode & three transistors to perform different tasks like activating & resetting the pixel, amplification & charge conversion, and multiplexing or selection.

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The CMOS sensor’s multiplexing configuration is frequently connected with an electronic rolling shutter; even though with extra transistors at the pixel location, a global shutter will be achieved where all pixels are uncovered at the same time and then read out serially.

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The cameras which are used at the consumer level are available with additional components to store the image in memory, LCD & switches, and control knobs but machine vision type cameras do not include.

In a CMOS image sensor, the charge from the photosensitive pixel at the pixel location can be changed to a voltage & the signal is multiplexed through row and column and it is received by  digital to analog converter chip.

Imaging electronics plays an essential role in imaging system performance. This system includes different components like a camera, software, capture board, cables, etc. So, it is very significant to understand the concept of a camera sensor because it is an essential component in an imaging system or camera but two different cameras with a similar sensor can have different performance & properties because of the interface of electronics within the design. In the past, phototubes like Vidicons & Plumbicons are used as image sensors in the camera but now these sensors are available in two types CMOS sensor and CCD sensor. Image sensors are semiconductor devices used to change optical images into digital signals, which are extensively used in digital cameras & optical devices.

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The CMOS sensor multilayer fabrication procedure does not allow using microlenses over the chip, thus reducing the effective collection efficiency. So this less efficiency combined through pixel-to-pixel difference gives a lower signal-to-noise ratio & less overall image quality as compared to CCD sensors.

Depending on the manufacturer of the digital camera, the components used in the camera system and its design will be changed. The main function of this design is to change light into a digital signal then it can be examined to activate some further enhancement or user defined actions.

There are two types of CMOS sensors like active pixel sensor and passive pixel sensor where each type is discussed below.

The CMOS sensor works on the principle of the photoelectric effect to change the photons into electrical energy. Not like CCD sensors, CMOS sensors will change electric charge into voltage directly within the pixels. At present CMOS sensors are available with outstanding image quality & high frame rates, so used in high-performance-based industrial cameras.

The CMOS active pixel sensor uses a photodetector for detecting the light & changes it into an electrical signal. After that, this signal is amplified through different transistors & then moved through fixed wires. The CMOS APS applications mainly include motion capture cameras, X-ray imaging, web cameras, endoscopy camera, digital radiography, etc.

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Passive pixel CMOS sensors use photo sites to change photons into a voltage but, the noise generation throughout the development of the image is one of the major disadvantages to this kind of sensor.

Thus, this is all about an overview of an Introduction of CMOS Sensors which includes design, working, types, advantages, disadvantages, and its applications. Here is a question for you, what is the difference between CMOS & CCD image sensors?

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Each column end includes an amplifier. These sensors mainly suffer from several limitations like slow readout, lack of scalability & high noise. So these problems can be addressed by adding an amplifier to every pixel.

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The image sensor within a camera system receives incident light that is focused through a lens. Based on the type of image sensors like CMOS or CCD, the camera system will transmit data to the next phase like either a digital signal or a voltage.

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In these sensors, every passive pixel includes an access transistor and a photodiode. The pixels in this sensor are arranged in a two-dimensional structure through access enable wire shared through pixels within the similar row & output wire is shared through the column.

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CMOS sensors convert photons into electrons to a voltage & after that into a digital value through an on-chip ADC (Analog to Digital Converter).

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The most widely used CMOS sensor IC is the OV7670 camera sensor module. This is a highly sensitive, low voltage, and small size CMOS image Sensor module used to capture and process the image. This module is available with different pin configurations from different Manufacturers. TheOV7670 IC provides windowed 8-bit and full-frame images in different formats.

This sensor is manufactured through the CMOS process, so it is known as CMOS APS. This kind of sensor is similar to CCD or Charge Coupled Device because they are also known as active pixel image sensors & active pixel sensor imagers.

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The OV7670 mainly includes an image sensor array, A/D converter, timing generator, analog signal processor, image scalar, DSP, test pattern generator, digital video port, LED, etc. This image sensor can be controlled through SCCB or Serial Camera Control Bus which is an I2C interface with 400KHz.maximum CLK frequency.