Differences between PC cameras, CCD cameras, and CMOS cameras

The sensitivity of a CMOS sensor is usually 10 times lower than that of a CCD sensor. The human eye can see the Targets below 1 lux illumination (night of the full moon). The CCD sensor can usually see the Targets below 0.1 ~ The target with less than 3 lux illumination is 3 to 10 times the sensitivity of the CMOS sensor.
The sensitivity of the CMOS sensor is generally within the range of 6 to 15 lux. The CMOS sensor has a fixed noise 10 times higher than that of the CCD sensor, fixed pattern noise always stays on the screen as if it is a pattern, because CMOS Sensors below 10 lux are basically useless, so many industrial and broadcast-level cameras are using CCD sensors, CMOS Sensors are generally used for low-end household products.

The CMOS sensor can put all the logic and control loops on the same silicon chip block, which can make the camera simple and easy to carry, so the CMOS camera can be very small. Although CCD represents a "charge coupler" and CMOS represents a "complementary metal oxide semiconductor", no matter CCD or CMOS is useless for image sensing, the actually sensed sensor is called an "image semiconductor ", CCD and CMOS Sensors (for the time being) are actually using the same sensor "image semiconductor". Image semiconductor is a p n combination semiconductor, the photon explosion that can convert light is combined into a proportional number of electrons. The number of electrons is calculated by the signal voltage. The more light enters the image semiconductor, the more electrons are produced, and the higher the voltage output from the sensor.

CCD is called a "charge coupler". CCD is actually a method for storing electrons from an image semiconductor in an organized manner. CMOS is called "Complementary Metal Oxide Semiconductor". In fact, CMOS is only a technology that places a transistor on a silicon block. A sensor, known as a CMOS sensor, is only used to distinguish it from a CCD Sensor and has nothing to do with the true method that the sensor uses to process images.

CMOS Sensors directly convert the electrons produced by image semiconductors into voltage signals without complex processing.

What is the difference between a computer camera and a monitoring camera?

Currently, there are basically two types of cameras on the market: one is a digital camera which can be used independently with a microcomputer. It is relatively simple and belongs to the household level. Another type is analog cameras, which must be used together with video capture cards. The processing circuit with loads is an industrial level.
Digital Camera: a digital camera is a digital video input device that uses photoelectric technology to collect images, instead of using a simulated Acquisition Tool like a video capture card, then, the image input is completed by using the dedicated module. The advantage of a digital camera is that it is easy to use. Generally, it is connected through a microcomputer parallel communication port or USB. It is plug-and-play and easy to install. It is especially suitable for portable computers and desktop computers that cannot open the chassis. The overall price is usually lower than buying cameras and capture cards of the same grade.

However, the disadvantages of digital cameras are obvious. Due to the use of CMOS as a photosensitive device, the capture speed above 640*480 is not very fast (less than 30 frames ). Currently, most cameras on the market have a resolution of about X. Generally, at 352x288, the resolution can reach 30 frames per second. The price of digital cameras is also relatively low. Generally, they are positioned below 1000 yuan and can be accepted by the public. Generally, home users can consider buying digital cameras.
Analog cameras: Most analog cameras are CCD cameras, which have different resolutions based on different levels. Analog cameras at the same level as digital cameras are generally used for industrial purposes. They have high resolution, good real-time performance, and low resolution. To work with a computer, a simulated camera must have a video capture card or an external capture card. Video capture cards are very popular, from more than six hundred yuan to tens of thousands of yuan. Expensive video capture cards often carry real-time video compression functions and are suitable for professional use.

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