FLIR Lepton 1.5, Engineering Data Sheet

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FLIR LEPTON® Engineering Datasheet
The information contained herein does not contain technology as defined by the EAR, 15 CFR 772, is publicly available,
and therefore, not subject to EAR. NSR (6/14/2018).
Information on this page is subject to change without notice.
Lepton Engineering Datasheet, Document Number: 500-0659-00-09 Rev: 203
14
2.10 GPIO Interface Module (GPIO IF)
The General-Purpose Input / Output (GPIO) Interface module implements the GPIO pins, which can be runtime
configured (see
GPIO Modes
, page
39
).
2.11 Video Pipeline
A block diagram of the video pipeline is shown in
Figure 4
.
Figure 4 - Lepton Video Pipeline Block Diagram
The video pipeline includes non-uniformity correction (NUC), defect replacement, spatial and temporal filtering,
automatic gain correction (AGC), and colorization.
2.11.1 NUC
The non-uniformity correction (NUC) block applies correction terms to ensure that the camera produces a
uniform output for each pixel when imaging a uniform thermal scene. Factory-calibrated terms are applied to
compensate for temperature effects, pixel response variations, and lens-illumination roll-off. To compensate for
temporal drift, the NUC block also applies an offset term that can be periodically updated at runtime via a process
called flat-field correction (FFC). The FFC process is further described in
FFC States , page 18 .
2.11.2 Defect Replacement
The defect-replacement block substitutes for any pixels identified as defective during factory calibration or during
runtime. The replacement algorithm assesses the values of neighboring pixels and calculates an optimum
replacement value.
2.11.3 Spatial / Temporal Filtering
The image pipeline includes several sophisticated image filters designed to enhance signal-to-noise ratio (SNR) by
eliminating temporal noise and residual non-uniformity. The filtering suite includes a scene-based non-uniformity