Skip to content
AkerminMeasure. Monitor. Improve. Compare Products
Learning Center

Thermal Camera Resolution Explained

Thermal resolution is counted in detector pixels: 80×60, 160×120, 256×192, 320×240, 640×480. Marketing also quotes "super-resolution" and blended visible images, neither of which adds a single thermal pixel. Here is how to read the numbers and how many you need.

By the Akermin Editorial Team · 3 min read

Thermal camera resolution is the number of infrared-sensitive elements in the detector, quoted as width × height: 80×60 (4,800 pixels), 160×120 (19,200), 256×192 (49,152), 320×240 (76,800), 640×480 (307,200). That native figure decides how small a defect the camera can resolve at a given distance. Super-resolution modes, interpolated display sizes and visible-light overlays make images look sharper but add no thermal information. Compare cameras on the native number.

Why native pixels matter

Each pixel reports one temperature averaged over the patch of the scene it covers. The size of that patch is the pixel’s instantaneous field of view (IFOV), set by the detector pitch and the lens. A 160×120 camera with a 50° lens covers about 5.5 milliradians per pixel: at 3 m, each pixel sees a patch about 16 mm across. A defect smaller than a few pixels is smeared into its surroundings and its temperature reads wrong. Doubling the resolution halves the patch size at the same distance, or doubles the working distance for the same detail.

Native resolution Pixel patch at 3 m (typical lens) Smallest reliably measured target at 3 m
80×60 About 30 mm About 90 mm
160×120 About 16 mm About 50 mm
256×192 About 10 mm About 30 mm
320×240 About 8 mm About 25 mm
640×480 About 4 mm About 12 mm

Figures vary with lens angle; a narrow lens gives smaller patches over a smaller area. The “smallest measured target” is roughly three pixels across, the usual rule for an accurate spot reading.

What the other numbers mean

  • Super-resolution / TISR / VividIR / SuperResolution: software that combines slightly shifted frames or interpolates to output a larger image (240×240 from 128×128, 480×360 from 160×120). It can genuinely reduce noise and improve apparent sharpness, but it cannot recover detail below the native pixel patch.
  • Display resolution: the screen the image is shown on, often much higher than the detector. Irrelevant to measurement.
  • MSX, fusion, picture-in-picture: blends of the visible camera’s image with the thermal one. They make the picture readable and change nothing in the thermal data.
  • Visible camera resolution: the megapixels of the ordinary camera used for overlays and reports.

Resolution versus sensitivity

Resolution is how fine; sensitivity (NETD) is how faint. A high-resolution camera with poor sensitivity shows a sharp, noisy image where small temperature differences are lost; a low-resolution camera with excellent sensitivity shows a blurry image where they are visible. Building surveys need both, since insulation defects are often only 1 to 2 °C different. See what NETD is.

How much you need

  • Spot checks at arm’s length (breakers, pipes, seals): 80×60 works.
  • Home inspection, room by room: 160×120 native is the practical floor; 256×192 is a comfortable step up and now common in mid-priced cameras.
  • Whole facades from outside, roofs, large plant: 320×240 or more, or get closer.
  • Professional reporting and small electrical components: 320×240 to 640×480.

The cameras in best thermal cameras for home inspection are listed by native resolution first. For the physics behind the detector, see how a thermal camera sees heat.

Flir C5 Compact Thermal Imaging Camera, WiFi, 160x120 MSX, Ignite

Flir C5 Compact Thermal Imaging Camera, WiFi, 160x120 MSX, Ignite

View on Amazon
Flir One Pro - Thermal Imaging Camera for iOS Smartphones (iPhone 15 and Newer w/USB-C), 480x360 Super Resolution (160x120 Native IR)

Flir One Pro - Thermal Imaging Camera for iOS Smartphones

View on Amazon

Products shown because their documented specifications fit this guide. Price and availability are on Amazon and can change.

Frequently Asked Questions

What resolution thermal camera do I need for home inspection?

160×120 native is the practical minimum for whole-wall surveys at a few meters. 320×240 shows finer detail and works from further away. 80×60 is usable at close range for spot checks.

Is 480×360 super-resolution the same as a 480×360 detector?

No. Super-resolution combines several frames or interpolates to produce a smoother, larger image from a smaller detector. It can look sharper but cannot reveal detail the detector did not capture.

Does MSX increase thermal resolution?

No. MSX draws edges from the visible camera onto the thermal image so shapes are recognizable. The thermal data underneath is unchanged.

Affiliate disclosure: Akermin earns a commission from qualifying Amazon purchases made through links on this page. Our editorial picks are based on documented specifications and owner feedback, not commissions.