3× Digital Zoom in Thermal Images: What to Check

A 3× digital-zoom claim must be checked against the exact camera mode and application. It should not be described as a threefold increase in native detector resolution. This article does not verify a 3× thermal zoom mode in a Phonemax handset.

Separate three image dimensions

Record the native detector array, the portion displayed when zoom is selected and the dimensions of the saved file. A larger on-screen view is not, on its own, evidence of additional detector samples.

Use the same scene for comparison

• Keep the target, camera position and relevant settings unchanged.
• Request an unzoomed thermal output and an output using the claimed zoom mode.
• Check whether the saved file represents the full scene, a crop or a processed enlargement.
• Ask what measurement information, if any, remains available in the exported result.

Do not substitute digital enlargement for optics

The current P20 Pro thermal graphic lists 256 × 192 resolution. Do not relabel it as a different native array because an application can display a larger picture. If small target details are important, evaluate the actual target, distance and lens configuration.

The resolution guide covers the broader detail question. This page is specifically a zoom-output acceptance check.

Source and scope

P20 Pro product page; FLIR: detector pixels and field of view. No original zoom comparison or detection-range improvement is reported here.