Traditionally, global shutter pixel technology has been used primarily for CCD image sensors. Image sensor supplier ApTIna has been working to overcome the use of CMOS image sensors due to the increasing popularity of CMOS image sensors and the need to capture fast-moving objects with high image quality due to machine vision, film production, industrial, automotive and scanning applications. Traditional barriers to global shutter pixel technology. In this effort, the global shutter pixel technology provided has a smaller pixel size, a larger fill factor, a higher GSE, a lower dark current, and lower noise, making CMOS image sensors more useful. It is a viable alternative to CCD sensors.
Rolling shutter technology overviewThe rolling shutter is also called a focal-plane shutter, and uses two scans of row reset and read read and readout to control the exposure time. The shutter pulse that implements row reset resets a row of pixels before row readout (as shown in Figure 1). The time interval between the shutter and the readout pulse determines the exposure time. However, when using the rolling shutter sensor, since the exposure of different lines is performed at different time points, distortion occurs when shooting still images of fast moving objects, which makes the rolling shutter not suitable for bar code reading, machines. Applications such as visual or automated inspection systems, as these applications require imaging of fast moving objects.
Figure 1, how the typical shutter shutter works
People often use certain film cameras and CMOS digital cameras and camcorders to find that the shutter shutter cannot record the entire picture at a single point in time, but instead captures the continuous pixel strip by scanning the entire picture vertically or horizontally. The advantage of the rolling shutter is that the image sensor can continuously collect photons during shooting, which enhances the light sensitivity. However, when filming under extreme conditions such as motion or flash, the rolling shutter has obvious disadvantages: distortion caused by fast moving objects or flashes, such as smear, distortion, sway, and partial exposure.
In the past, people have been exploring how to switch from a rolling shutter to a global shutter. But CMOS image sensor vendors have found that adding additional memory cells will sacrifice too much of the photosensitive (electrode) region, which has a negative impact on quantum efficiency. Moreover, due to the consideration of semiconductor technology, application requirements, market demand, cost and other factors at that time, it was impossible to determine the feasibility of the product and failed to make progress.
Digital Clamp Meter ,Digital Clamp Multimeter,Clamp Meter,Ac Clamp Meters
YINTE TOOLS (NINGBO) CO., LTD , https://www.yinte-tools.com