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Thermimage (version 3.1.2)

Thermal Image Analysis

Description

A collection of functions and routines for inputting thermal image video files, plotting and converting binary raw data into estimates of temperature. First published 2015-03-26. Written primarily for research purposes in biological applications of thermal images. v1 included the base calculations for converting thermal image binary values to temperatures. v2 included additional equations for providing heat transfer calculations and an import function for thermal image files (v2.2.3 fixed error importing thermal image to windows OS). v3. Added numerous functions for converting thermal image, videos, rewriting and exporting. v3.1. Added new functions to convert files.

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Install

install.packages('Thermimage')

Monthly Downloads

195

Version

3.1.2

License

GPL (>= 2)

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Repository

https://github.com/gtatters/Thermimage

Homepage

https://cran.r-project.org/package=Thermimage

Maintainer

Glenn Tattersall

Last Published

November 5th, 2018

Functions in Thermimage (3.1.2)

Determines the Grashof number for an object

Nusselt number for forced convection.

airspecificheat

Specific heat capacity of air

airtconductivity

Thermal conductivity of air.

Convert FLIR jpg into 16 bit grayscale file using shell commands.

Convert FLIR CSQ or SEQ into PNG or AVI, using shell commands.

Nusselt number for free convection.

Estimates ground temperature from ambient temperature and solar radiation.

Extracts meta tag information from a FLIR JPG image

Colour palette extracted from FLIR thermal camera files

Colour palette extracted from FLIR thermal camera files

Estimates equivalent temperature.

Colour palette extracted from FLIR thermal camera files

Colour palette extracted from FLIR thermal camera files

Convective heat coefficient (W/m2/oC)

Returns the Prandtl number

Returns the index locations that match vector fid within data vector.

The Stephan Boltzman constant.

Calculate the mean every nth data point.

Operative temperature estimate.

Colour palette extracted from FLIR thermal camera files

Colour palette extracted from FLIR thermal camera files

Find the frame read start positions in a thermal video file.

Calculates the Reynolds number.

forcedparameters

Parameters required for forced convection equation.

Reads an image from a FLIR JPG file into an integer array.

Colour palette extracted from FLIR thermal camera files

rotate180.matrix

Rotate a matrix by 180 degrees. Used for adjusting image plotting in R.

Returns air viscosity for a given air temperature.

Mirrors a matrix upside-down. Used in re-arranging image data for plotting properly in R.

Plot thermal image data for visualisation purposes.

A sample thermal image to demonstrate thermal colour palette use.

Provides the surface are of a cone

Calculate the slope every nth data point.

Estimates the absorbed solar and infrared radiation (W/m2)

Returns the slope from linear regression with x values as equally spaced 1:length

Converts temperature (oC) to raw thermal data

A simplified wrapper function calling ffmpeg

Estimates upward facing ground radiation (W/m2)

Flips a matrix 'left-right'. Used in re-arranging image data for plotting properly in R.

Estimates downward facing longwave radiation (W/m2)

Parameters required for free convection equation.

Provides the surface area of a sphere.

Extracts time values as POSIX from binary imported thermal video file

Provides the surface area of a cylinder.

Extract raw binary thermal from thermal image file.

Colour palette extracted from FLIR thermal camera files

Thermimage-package

Handles thermal image data input and conversion to temperature using established physical equations.

Choose a colour palette for gradient filling thermal image files.

Estimates the area specific heat transfer by conduction (W/m2)

Colour palette extracted from FLIR thermal camera files

Add leading zeros to character for easy sequential naming of filenames.

Returns the density of air for a given air temperature.

Cumulative difference sum function for use with frame by frame difference dataframe

A frame difference function for subtracting adjacent frames from an imported thermal image sequence.

Estimates the area specific heat transfer by convection (W/m2)

Converts raw thermal data into temperature (oC)

Saves thermal image data to a binary file

Colour palette extracted from FLIR thermal camera files

Colour palette extracted from FLIR thermal camera files

Colour palette extracted from FLIR thermal camera files

Colour palette extracted from FLIR thermal camera files

Colour palette extracted from Mikron thermal camera files

Estimates the area specific heat transfer by radiation (W/m2)

Return summary of thermal image data.

Colour palette extracted from FLIR thermal camera files

rotate270.matrix

Rotate a matrix by 270 degrees counterclockwise (or 90 degree clockwise). Used for adjusting image plotting in R.

rotate90.matrix

Rotate a matrix by 90 degrees counterclockwise (270 degrees clockwise). Used for adjusting image plotting in R.

Summary thermal calculations on a centrally located region of interest from a thermal image dataset

Estimates downward facing longwave radiation (W/m2)