Rolling Shutter vs Global Shutter

The difference in imaging between global shutter sensor and rolling shutter sensor is mainly reflected in the dynamic image acquisition: 

&#;&#;When capturing high-speed moving objects, distortion occurs easily in rolling shutter mode. This is visible in Figure 6: Capturing the high-speed running fan, the images of global shutter sensors and rolling shutter sensors are shown in the left image and right image. The left image can restore the shape of the fan blade perfectly but the right image is deformed. 

&#; When capturing brightness variation objects, horizontal stripes with uneven brightness may be occur in rolling shutter mode. This is shown in the following figure 7. We have set the exposure time to 5ms and are capturing the indoor objects under the fluorescent lamp (take off the lens) with global shutter sensor and rolling shutter sensor respectively. The right image has clear water ripples in the background and the left image&#;s background is relatively uniform. This is because the frequency of fluorescent lamp is 50Hz, the period is 10ms (a period of absolute value). The exposure time 5ms may fall in the brighter range, and may also fall in the darker range. For rolling shutter sensor, each line of the array exposes at different times. Therefore, bright and dark, period variations stripes appeared in the image. For the global shutter sensor, all lines in the sensor begin and end the exposure simultaneously, no stripes will appear

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The following image sequence can interpret the imaging process of a rolling shutter sensor capturing a running dog. The dog is running from right to left. When the first line begins exposure, the dog&#;s head just entering the frame. When the last line begins exposure, the dog is nearly out of the frame. Each line exposes, the dog is at a different position, so the final image shows a &#;split&#; dog. 

Figure 9 shows the following. Strobe is the flash signal output by the camera. When the strobe signal is high, the strobe flashes (sometimes, when the strobe signal is low, the strobe flashes). When the strobe flashes, all the lines expose at the same time, so the image has no distortion. 

There are several aspects to be aware of when using the sync flash feature with the rolling shutter sensor: 
&#;&#;Note that with all the exposure time that has strobe signal output, when the exposure time is too short and the readout time is too long, all the lines have no overlap exposure. There is no strobe signal output, and the strobe does not flash. 
&#;&#;When the time of the strobe flash is shorter than the exposure time  
&#;&#;When the strobe signal output time is too short (μs level), some strobe&#;s performance can&#;t meet the high-speed switch requirement, so the strobe can&#;t catch the strobe signal 

As a leading manufacturer with over ten years of experience in producing high-quality camera modules, our company specializes in global shutter camera modules, a technology that offers significant advantages in various imaging applications. In this article, we&#;ll compare global shutter and rolling shutter, two common types of image sensors, to help you understand their differences and why global shutter technology is our primary focus.

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A global shutter captures the entire image at once, meaning that all pixels are exposed simultaneously. This is particularly beneficial in situations where fast-moving objects are present or in high-speed photography. With global shutters, there is no distortion or "rolling" of the image when the scene contains moving elements. This feature makes global shutter camera modules ideal for applications such as robotics, industrial automation, machine vision, and high-speed video capture.

In contrast, a rolling shutter works by exposing different rows of pixels at different times, usually from top to bottom. This can cause distortion, particularly with fast-moving subjects or when the camera itself is in motion. For example, in sports or automotive photography, the rolling shutter effect can result in a "skewed" image, where vertical lines appear tilted or wobbly. While rolling shutters are generally less expensive and simpler to manufacture, they are not suited for fast-moving scenes.

Our company specializes in global shutter camera modules because they provide more accurate, distortion-free images in dynamic environments. With our deep expertise in manufacturing and innovation, we produce global shutter modules that meet the highest industry standards. Whether used in drones, autonomous vehicles, or surveillance systems, a global shutter is essential for capturing clear images in a variety of challenging conditions. Our decade of expertise in global shutter modules will continue to lead the way in the development and production of global shutter camera modules, providing our customers with reliable, high-performance solutions that meet their specific needs.

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