Analyze and compare various differences between lens CMOS and CCD

The lens is like the eye of the camera. Its quality directly determines the clarity of the camera. Now there are mainly CMOS and CCD lenses. Let's compare the advantages and disadvantages of both CCD and CMOS.

According to Guo Junwei: "There are different lengths of CCD and CMOS sensors. CMOS sensors have the advantages of low cost, high integration, high speed, and low power consumption. CCD can provide better sensitivity and better image quality. It can be said that there are thousands of years."

Pixel composition. Guo Junwei said: "The CCD has a large photosensitive surface due to the absence of an amplifying circuit in the pixel, so it can provide better sensitivity and greater resolution than the same size CMOS. But because all charges are pixel by pixel. Shift, after being processed by an amplifier, the manufacturing process is much more complicated than CMOS and the yield is low, so the cost of the CCD is much higher than that of the CMOS."

Data reading efficiency. Guo Junwei also said: "CMOS has high-speed reading efficiency, and has a natural advantage for processing high-resolution large amounts of data. Once its production process is mature and easy to integrate with other SOCs, the overall cost of the solution is significantly better than CCD. At the same time, based on its pixel structure, its power consumption is relatively small."

Sensitivity. It is reported that since each charge of the CMOS sensor is first amplified and then transferred, the problem is that the noise is too much and affects the image quality. In addition, each of its pixels contains an amplifier component, which reduces the unit photosensitive area, so its sensitivity is obviously not as good as CCD;

Imaging effect. Fan Qinghua said: "CCD has advantages because of its sensitive sensitivity, so it has advantages in low illumination, and the high pixel advantage of CMOS. Due to the large amount of data processing in high-definition monitoring, the cost of CCD is relatively high, so it is often Most of the CMOS sensors are used. It is reported that Suzhou Keda HD sensor CCD and CMOS are used, such as ordinary guns and hemispheres use high-definition CMOS sensors, while achieving high-definition resolution and color reproduction, while ensuring a lower price; For laser and infrared cameras, a CCD image sensor is used, which mainly ensures the nighttime infrared fill light effect;

Exposure time. Fan Qinghua said: "The CCD usually adopts the Global Shutter shutter method, and the exposure time is shorter, which is suitable for road capture applications. Since the CMOS mostly uses the Rolling Shutter electronic shutter method, when the object moves faster, partial exposure, tilt, and jitter will occur. In other cases, manufacturers have begun to use Global Shutter technology on CMOS, or to solve the flash synchronization problem in the existing Rolling Shutter mode through a long-delay flash."

From this point of view, CCD and CMOS have their own advantages. However, with the introduction of Sony Exmor CMOS, the low-light effect and noise control of CMOS have been greatly improved, and the effect of CCD can be achieved in the low-light aspect. For example, the sensors selected by Tiandi Weiye are all back. According to the CMOS image sensor, it is no wonder that Aipu Shida Fan Tsinghua said: "At present, under the continuous efforts of the major manufacturers, new CMOS devices continue to evolve. High dynamic range CMOS devices have emerged that eliminate the need for shutter, aperture, automatic gain control, and gamma correction, making network cameras close to and beyond the CCD's imaging quality. In addition, due to CMOS's inherent plasticity, it can be made Large-scale CMOS photoreceptors with high-resolution pixels do not cost much. Compared to CCD, CMOS has shown great vitality as a new thing. As a core component of megapixel HD network cameras, CMOS image sensors have gradually The trend to replace CCD sensors."