Global Shutter vs. Rolling Shutter: Which Is Better for Your Camera Module Application?

When choosing the core image sensor for a camera module, in addition to focusing on resolution, sensor size, and technology type (such as CMOS), the shutter type is a crucial decision factor. It directly determines the module's performance when capturing moving scenes. There are two main types of electronic shutters: global shutter and rolling shutter.

Although both technologies can control the exposure time of pixels, there is an essential difference in the timing of the pixels' exposure to light when capturing the picture. Understanding the difference between global shutter vs. rolling shutter, especially how they affect moving images, is key to choosing a camera module for your specific application. One is not absolutely better than the other, and "which one is better" depends entirely on your specific needs.

Digital image sensors simulate the shutter function of a traditional camera by electronically controlling the time that pixels collect light (i.e., exposure time). There are two main types, based on the timing of pixel exposure and readout:

Global Shutter: In this mode, all pixels on the sensor start and end exposure at the same time. It captures a complete freeze-frame of the scene at a certain moment.Article about What is Global Shutter?
Rolling Shutter: Unlike the global shutter, the rolling shutter performs exposure and readout in a row-by-row scanning manner. The rows of pixels on the sensor are exposed and readout from the top to the bottom. The top of the image is captured before the bottom.

How gobal vs rolling shutte Capture Light Differently8

It is this difference in timing that leads to significant differences in image presentation, especially when dealing with fast motion.

Let's take a direct look at these two shutter types and how they affect image capture across a few key dimensions:

feature	Global Shutter	Rolling Shutter	Impact on image capture
Motion Capture	No motion distortion, can clearly and accurately capture high-speed moving objects	Can produce motion distortion (jello effect, tilt, partial exposure, etc.)	Determines whether fast-moving objects can be accurately captured and whether the image will be distorted due to motion
Exposure Timing	All pixels start/stop exposure simultaneously	Pixels start/stop exposure row by row	The global shutter captures the instantaneous image; the rolling shutter captures the scene status at different times within a period of time.
Pixel structure	More complex (requires additional circuitry to lock the charge)	Relatively simple	Global shutter pixels are usually larger or have a slightly lower fill factor (to accommodate the extra circuitry), which affects sensor size and cost.
Manufacturing Cost	Higher	Lower	Directly affects the final price of camera modules based on this sensor
Read speed	After exposure, the charges are locked simultaneously and then read out quickly (the readout speed does not directly cause distortion)	Exposure and readout overlap/serialize (readout speed is one of the causes of distortion)	The images captured by the global shutter are synchronized in time, and the reading speed affects the upper limit of the frame rate; the reading speed of the rolling shutter affects the degree of distortion and frame rate
Synchronicity	Easy to synchronize precisely with external events (e.g. trigger, strobe) or multi-camera systems	Difficult to synchronize accurately, may cause streaking with stroboscopic light sources	Important for applications that require multiple cameras to work together or to be precisely aligned with external light sources/events

The core advantage of choosing a global shutter camera module is its excellent performance in handling motion, which is mainly reflected in:

Eliminating motion distortion artifacts: This is the most critical advantage of the global shutter. It completely avoids the jello effect, tilt, partial exposure and other problems caused by the rolling shutter, and the image edges and shapes can remain accurate whether the camera is moving quickly or capturing high-speed objects.
Accurately capture the moment: Because the pictures are captured at the same time, the image data represents the precise state of the scene at a certain moment. This is crucial for applications that need to extract accurate measurement, identification or tracking information from the image.
Simplify the processing flow: The captured image itself is motion-free, and downstream image processing algorithms (such as measurement, identification, and stitching) can directly use the original image data without complex distortion correction steps, which improves system efficiency and accuracy.
Easy to synchronize: It is very suitable for applications that require precise time synchronization, such as collaborative positioning of multi-camera systems, precise alignment with robot arm movements or detection signals in industrial production, etc.

article about what is Global Shutte?

Despite the motion distortion issue, rolling shutter camera modules are still widely used due to their cost and implementation advantages:

Lower cost: The pixel design of rolling shutter sensors is relatively simple and the manufacturing cost is usually lower than that of global shutter sensors. This makes camera modules based on rolling shutter more attractive in price.
Relatively simple pixel design: This simplicity can bring advantages in some aspects, such as the light-sensitive area (fill factor) of rolling shutter pixels may be larger under the same technical conditions, which can help improve sensitivity performance or reduce noise (although modern global shutter CMOS has greatly improved it).
Suitable for non-motion scenes: In cases where your application mainly captures stationary objects, the movement is very slow, or even slight motion distortion is acceptable, rolling shutter is a completely sufficient and more cost-effective option.

article about what is rolling shutte?

Rolling Shutter distortion vs Global Shutter clarity with a fast-moving object8

The key to deciding between global shutter vs. rolling shutter is whether your camera module application involves fast motion and your tolerance for image motion distortion. The choice requires an evaluation based on the application requirements:

Analyze the motion in the application scenario:

Will your subject move quickly? How fast?
Does your camera module itself move quickly or vibrate violently when shooting?
Do you need to accurately measure, identify, or locate moving objects?
Does your system need to be precisely synchronized with high-speed external events (such as trigger signals, strobe lights)?

Determine whether a global shutter is needed:

If the answer to any of the above questions is yes, especially if your application requires high image accuracy in the presence of motion, then you probably need a global shutter camera module. The ability of a global shutter to eliminate motion distortion is critical to ensuring the accuracy of image data and ensuring that subsequent algorithms can run reliably. Although it is more expensive, it is a key investment to ensure the success of your application.
Typical scenarios that require global shutter: Machine vision inspection of high-speed production lines, license plate recognition, industrial measurement, AR/VR motion tracking, and multi-camera systems that require precise synchronization.

Determine if rolling shutter is sufficient:

If your application mainly captures still or slow-moving objects, or even slight motion distortion can be compensated to a certain extent by software without affecting the success of the final mission, then rolling shutter is usually a more cost-effective choice.
Typical scenarios suitable for rolling shutter: static monitoring, video conferencing, document scanning, general photography, cost-sensitive applications that do not involve high-speed motion.

Weigh cost and performance:

Only choose a global shutter module and accept its relatively higher cost after you are sure that you need the distortion-free motion capture and precise synchronization characteristics provided by the global shutter. If the rolling shutter is sufficient to meet your needs, take advantage of its cost advantage. During the camera module selection process, be sure to carefully review the module's specification sheet to clarify its shutter type.Article about How to Choose Camera Module for Vision System.

In the competition between global shutter and rolling shutter, there is no absolute "better" or "worse", only "more suitable". With its simultaneous capture characteristics, global shutter is an ideal choice for eliminating motion distortion, achieving precise synchronization, and capturing high-speed moments. It is especially indispensable in fields such as machine vision, traffic monitoring, and industrial automation that require extremely high image accuracy, despite its relatively high cost. Rolling shutter is a preferred option for many general and consumer applications due to its simple structure and low cost, and its good performance when shooting still or slow objects.

Understanding the fundamental differences between these two shutter technologies and their impact on the image, and based on your application scenario's requirements for motion capture and image accuracy, is the key to making the right camera module shutter type choice. Carefully evaluate your application requirements to find the best vision solution for you.

1.Can software fix the motion distortion caused by rolling shutter?
A.To some extent, yes. There are software algorithms that try to correct the motion distortion caused by rolling shutter by analyzing the motion and applying computational compensation. However, this software correction has limited effectiveness, especially when the motion is very fast or the scene is complex, it is difficult to completely eliminate the distortion, and it increases processing latency and computational burden. For applications that require high precision and real-time performance, global shutter is usually a more reliable and efficient solution.

2.Does global shutter affect still photos?
A.When shooting still objects or the camera is stationary, the motion distortion elimination advantage of global shutter is not reflected. At this time, the main difference between global shutter and rolling shutter is in other aspects, such as potential noise level, photosensitivity efficiency or cost. Global shutter sensors have additional circuitry within the pixel, which may have an impact on their photosensitivity area or noise control (although modern technology has greatly improved it). So, for applications that only take still photos, using rolling shutter will generally not have a significant negative impact and may be less expensive.

3.What types of sensors usually use global shutter?
A.Historically, CCD sensors were global shutters by nature due to their charge transfer mechanism. Early CMOS sensors were mostly rolling shutters. But with the advancement of CMOS technology, modern CMOS sensors have been able to achieve global shutter functionality through more complex pixel designs, called global shutter CMOS. Therefore, global shutter technology currently exists mainly in CCD sensors (which are becoming less and less common) and high-performance CMOS sensors. If you need a global shutter, you will usually find this annotation in the specifications of high-performance CMOS sensors.

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