Published: September 19, 2026 | Category: Technical Guide | QSCompute
A frame camera answers the question “what does this look like, 30 times a second?” An event camera answers a different question entirely: “what changed, and exactly when?” Sony’s IMX636 — the stacked sensor Sony and Prophesee co-developed — outputs nothing at all for a static scene and emits a timestamped event, to microsecond resolution, for every pixel whose log-intensity crosses a threshold. That single design decision removes motion blur, buys more than 120 dB of dynamic range and drops sensor power to tens of milliwatts. It also changes what the surrounding hardware has to do.
This guide covers where event-based vision beats a frame camera on a production line, the bandwidth and storage arithmetic nobody budgets for, and how to choose the compute tier.
In a conventional CMOS sensor, every pixel is read on a shared clock. A global-shutter camera integrating light over a 1 ms exposure — at 200 parts per minute — will smear any feature that moves during that window. An event sensor has no exposure window at all. Each pixel independently monitors its own log-intensity and fires only when the change exceeds a contrast threshold (25% nominal on the IMX636), emitting an address-event carrying x, y, polarity and a timestamp at 1 µs resolution. There is no frame, no shutter, and no fixed sample rate.
Two consequences follow. Latency collapses: the sensor reports a moving edge within 100 µs at 1000 lux instead of waiting out a frame interval. And the data rate decouples from frame rate, scaling with scene activity — a stationary scene consumes almost nothing, a fast-moving one a great deal.
| Parameter | Industrial frame camera (global shutter) | Event-based sensor (IMX636 class) |
|---|---|---|
| Output | Full frames at a fixed rate | Sparse (x, y, polarity, timestamp) events |
| Resolution | 2–20 MP typical | 1280 × 720 (0.92 MP), mono |
| Dynamic range | ~60–70 dB | >86 dB (5–100,000 lux); >120 dB in low light |
| Latency to detect motion | One frame interval (e.g. 33 ms at 30 fps) | <100 µs at 1000 lux |
| Motion blur | Present — proportional to exposure time | None — no integration window |
| Sensor power | 1–3 W for high-speed cameras | ~32 mW at 100 kEPS to ~73 mW at 300 MEPS |
| Colour | Bayer RGB | Monochrome only |
| Temperature range | Often 0–50 °C | −40 °C to +85 °C operational |
The applications that justify the switch all share one property: the information of interest is carried by motion or by a change in brightness, not by static appearance.
Equally important is where it does not pay. Event sensors are monochrome, so colour sorting and colour defect classification stay on frame cameras, and texture, print and static surface grading need an integrating sensor. Reliable working distance is shorter than a comparable frame camera’s, so wide-area coverage still belongs to conventional sensors. Most production installations end up hybrid: an event sensor for fast change detection, a frame camera for the classification decision.
The arithmetic that catches projects out is simple: an event carries roughly 32 bits — x, y, polarity and timestamp — so one million events per second is about 4 MB/s of raw data, and the IMX636 peaks at 1.06 billion events per second.
| Event rate | Raw bandwidth (@32 bit/event) | Storage per hour | Storage per 24 h |
|---|---|---|---|
| 100 kEPS (idle line) | 0.4 MB/s | 1.4 GB | 34 GB |
| 1 MEPS (light activity) | 4 MB/s | 14.4 GB | 346 GB |
| 10 MEPS (busy cell) | 40 MB/s | 144 GB | 3.5 TB |
| 100 MEPS (high-speed line) | 400 MB/s | 1.4 TB | 35 TB |
| 1.06 GEPS (sensor peak) | ~4.2 GB/s | 15 TB | 360 TB |
For comparison, a 1080p stream at 30 fps and 8-bit mono is a constant 62 megapixels per second — about 186 MB/s, or 670 GB per hour — whether or not anything is happening. The frame camera pays the same cost for an empty conveyor as for a full one; the event camera pays only for activity.
Retention planning must therefore be activity-based, not camera-count-based. This is why an industrial SSD with a rated sustained write and a known DWPD figure matters more here than raw sequential throughput: the workload is continuous, small-block and unpredictable, and the drive is writing while the line is running, not in nightly batches.
Event streams are memory-bound and sparse, not FLOP-bound and dense, so the compute tier matters less than the accelerator’s ability to move small packets without stalling.
| Tier | Representative hardware | Best for | Notes |
|---|---|---|---|
| Event-native (SNN) | Intel Loihi 2, SynSense Speck | Ultra-low-power always-on detection | Loihi 2 + IMX636 pipelines demonstrated; on-chip SNN in Speck |
| Edge GPU module | Jetson Orin Nano / NX / AGX Orin | Most production deployments | Metavision SDK exposes 95 algorithms and 67 code samples |
| ARM SoC | RK3588, i.MX 95 | Cost-sensitive, moderate event rates | Verify NPU support for the chosen event representation |
| x86 + discrete GPU | L4, RTX 4000 SFF Ada, RTX PRO 6000 | Multi-camera, multi-model lines | Highest headroom; easiest fit for existing vision stacks |
| Host CPU only | Xeon / Core Ultra | Debug and orchestration | Adequate at low event rates; not for 10 MEPS+ |
The practical path for most integrators is to keep the algorithms they already have. Converting events into a time-surface or event-frame representation lets a standard CNN run unchanged on a Jetson or an L4. Event-native spiking networks on Loihi 2 or Speck remain the lower-power option — sub-millisecond end-to-end pipelines have been demonstrated on them — but the tooling is younger and the model zoo smaller.
Finally, the station still has to talk to the plant. Event output should reach the PLC over OPC-UA or Modbus TCP rather than being polled out of a vision application, and the sensor interface — USB3 Vision, GigE Vision or GMSL2 — sets the cable run and enclosure design before any compute decision matters.
Write these into the specification and the vendor conversation becomes short:
QSCompute supplies the compute side of event-based vision systems — Jetson Orin modules and carrier boards, fanless industrial PCs, L4 and RTX workstation accelerators, and industrial NVMe storage sized for continuous event logging.
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