What Is an EO/IR Camera?

An EO/IR camera is an imaging payload that combines an electro-optical camera, which sees visible light like a normal camera, with an infrared camera, which sees heat. EO/IR stands for electro-optical/infrared. The two sensors share one housing, usually on a gyro-stabilised gimbal, so the operator can switch between them, or view both at once, while looking at the same scene.

The combination matters because each sensor covers the other’s weak spots. The EO channel gives colour, fine detail and long zoom by day. The IR channel sees through darkness, smoke and light haze, and picks out people and vehicles by their heat signature even when they blend into the background. Together they give round-the-clock observation from one payload, which is why EO/IR systems are standard on ISR drones, patrol aircraft, border towers, ships and armoured vehicles.

The same idea appears in civil systems too. Search and rescue helicopters, firefighting aircraft, pipeline patrols and critical site perimeters all use dual daylight and thermal cameras, usually in lighter, less specialised gimbals.

A typical EO/IR gimbal packs several sensors and the electronics to steady and point them.

Infrared is not one band. The detector type sets what the camera can see, how far and at what size and power.

Cooled MWIR cameras give the longest detection ranges but need a cryocooler, which adds size, weight, power and maintenance. Uncooled LWIR cameras suit small drones and vehicles where those budgets are tight. Range is usually quoted as detection, recognition and identification (DRI) distances, which fall sharply from the first to the last.

EO/IR is a core sensor for intelligence, surveillance and reconnaissance. On drones and aircraft it finds and follows targets from stand-off range. On border towers and coastal sites it watches long perimeters day and night. On ships it supports navigation, search and rescue and maritime security, and on vehicles it gives crews situational awareness without exposing them. Because many of these platforms are small, payload choice is a trade-off between range and SWaP-C: size, weight, power and cost.

When comparing payloads, the useful questions are practical ones. Which IR band and detector does it use, and what are its DRI ranges for the targets you care about? How many axes of stabilisation does the gimbal have, and how steady is the image at full zoom? What video and control interfaces does it offer, and does it send pointing metadata so a target can be placed on a map? And what power, weight and mounting does the platform allow? The answers decide both the camera and the computer that processes its video.

Many EO/IR gimbals output HD-SDI, which travels long cable runs with very low latency, and newer payloads also stream compressed video over Ethernet, often to the NATO STANAG 4609 format with KLV metadata giving the sensor’s position and pointing angle. To run AI detection on that video, the feed needs a computer with matching inputs. 3G-SDI and HD-SDI capture cards bring the video into the computer, and an AI model then detects and classifies people, vehicles and vessels, while object tracking follows them from frame to frame.

Running that processing on the platform means only alerts and short clips need to cross the radio link, rather than continuous full-resolution video. Our guide to SDI capture for edge AI explains the options, and our guide to Jetson for drones covers the onboard computer. Our mission computers include Jetson AGX Orin tactical systems with four SDI capture inputs for EO/IR payloads.

We supply rugged AI computers with SDI capture fitted as standard for EO/IR integrators, with drivers and the video pipeline configured and each input validated before the system ships.