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Thermimage (version 4.0.1)

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. v3.2. Fixed the various functions related to finding frame times. v4.0. fixed an error in atmospheric attenuation constants, affecting raw2temp and temp2raw functions. Recommend update for use with long distance calculations.

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Install

install.packages('Thermimage')

Monthly Downloads

291

Version

4.0.1

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 30th, 2019

Functions in Thermimage (4.0.1)

Estimates upward facing ground radiation (W/m2)

Determines the Grashof number for an object

Estimates downward facing longwave radiation (W/m2)

Returns air viscosity for a given air temperature.

Estimates equivalent temperature.

forcedparameters

Parameters required for forced convection equation.

Estimates ground temperature from ambient temperature and solar radiation.

Provides the surface are of a cone

A simplified wrapper function calling ffmpeg

Extracts time values from binary imported thermal video file

Find the frame read start positions in a FLIR SEQ video file.

Colour palette extracted from FLIR thermal camera files

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

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

Choose a colour palette for gradient filling thermal image files.

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

airtconductivity

Thermal conductivity of air.

Operative temperature estimate.

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

The Stephan Boltzman constant.

airspecificheat

Specific heat capacity of air

Returns the Prandtl number

Calculates the Reynolds number.

Colour palette extracted from FLIR thermal camera files

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

Colour palette extracted from FLIR thermal camera files

Plot thermal image data for visualisation purposes.

Colour palette extracted from Mikron thermal camera files

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

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

A sample thermal image to demonstrate thermal colour palette use.

Calculate the slope every nth data point.

Colour palette extracted from FLIR thermal camera files

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

Saves thermal image data to a binary file

Returns the density of air for a given air temperature.

Thermimage-package

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

Calculate the mean every nth data point.

Converts raw thermal data into temperature (oC)

rotate90.matrix

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

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.

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

Nusselt number for free convection.

Colour palette extracted from FLIR thermal camera files

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

Nusselt number for forced convection.

Convective heat coefficient (W/m2/oC)

Colour palette extracted from FLIR thermal camera files

Provides the surface area of a cylinder.

Provides the surface area of a sphere.

Colour palette extracted from FLIR thermal camera files

Extracts meta tag information from a FLIR JPG image

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

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

Converts temperature (oC) to raw thermal data

Colour palette extracted from FLIR thermal camera files

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

Extract raw binary thermal from thermal image file.

Parameters required for free convection equation.

Colour palette extracted from FLIR thermal camera files

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

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

rotate180.matrix

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

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

Return summary of thermal image data.

Estimates downward facing longwave radiation (W/m2)