Rolling shutter and global shutter are two mainstream exposure modes for CMOS image sensors. A detailed comparison between the two is presented below:

Pixels on the sensor are exposed row by row in sequential order. Exposure starts from the first row, then the second row, the third row, and continues downwards until all rows of the photosensitive array finish exposure. Different pixel rows have different exposure timings.

Every pixel across the entire CMOS sensor starts exposure simultaneously and terminates exposure at the exact same moment. All pixels receive incident light synchronously throughout the exposure cycle.

It supports shorter exposure durations and performs well for static shooting scenarios. It features lower power consumption, relatively low manufacturing cost, simpler circuit design, and capability to achieve higher frame rates.

When capturing fast-moving objects, it preserves sharp, undistorted imagery free from scanning-induced deformation. It is well-suited for high dynamic range applications and delivers uniform exposure across every frame for fast-moving subjects or transient instantaneous scenes.

It is prone to the rolling shutter effect when photographing high-speed moving objects, causing geometric stretching, skewing or image distortion. It delivers subpar results for dynamic scenes and struggles to capture clear, accurate motion footage.

Global shutter CMOS sensors adopt relatively complex internal architectures, leading to higher production costs. In certain conditions, physical constraints may limit response speed, introducing latency when reading out full-frame large-area exposure data.

Widely deployed in general CMOS sensors, ideal for everyday photography and static applications, including landscape photography, still-life shooting, robotic pick-and-place operations, PCB inspection, and microscopic examination.

Commonly adopted for industrial inspection, motion capture, autonomous driving, sports event filming, traffic surveillance, and scientific research requiring precise recording of high-speed movements.

Three primary contributing factors are explained as follows:

For global shutter, all pixels expose at once; once exposure completes, the full-frame pixel data must be processed and read out in one batch. The massive instantaneous data load imposes bottlenecks on the camera’s signal processing circuitry and data transmission bus, restricting maximum achievable frame rate.By contrast, rolling shutter operates line by line: while one row is being exposed, data from the preceding row can be read out concurrently. This partial parallelism between exposure and readout enables intrinsically higher frame rate potential.

Global shutter sensors require more complex internal design. Many global shutter CMOS integrate extra storage capacitors and intricate control circuitry for every individual pixel, increasing design complexity, manufacturing difficulty and limiting operating speed. Rolling shutter sensors feature simpler structure, and the row-wise scanning scheme makes high frame rate implementation much more straightforward.

Global shutter requires synchronized exposure across all pixels. To guarantee acceptable image quality, exposure duration cannot be excessively short, otherwise insufficient light intake will degrade image brightness and signal-to-noise ratio (SNR). Rolling shutter can shorten per-row exposure to achieve shorter total frame exposure time, making high frame rates easier to attain under identical lighting conditions.Additionally, global shutter must spend extra time reading out an entire frame after exposure finishes. Rolling shutter executes row-level data readout in parallel with ongoing exposure for subsequent rows, cutting total cycle overhead.

Nevertheless, continuous technological advances are steadily improving global shutter sensor performance. Modern global shutter solutions can already reach high frame rates for niche use cases, meeting stringent demands for high-speed imaging and high-precision image fidelity.