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Thermimage (version 4.1.3)

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. v.4.1.3 changed to frameLocates to reflect change to as.character() to format().

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Install

install.packages('Thermimage')

Monthly Downloads

275

Version

4.1.3

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

September 27th, 2021

Functions in Thermimage (4.1.3)

Returns the Prandtl number

Estimates upward facing ground radiation (W/m2)

Nusselt number for forced convection.

Determines the Grashof number for an object

The Stephan Boltzman constant.

Calculates the Reynolds number.

Estimates downward facing longwave radiation (W/m2)

Nusselt number for free convection.

Provides the surface area of a cylinder.

Thermimage-package

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

Provides the surface area of a sphere.

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

forcedparameters

Parameters required for forced convection equation.

Returns the density of air for a given air temperature.

Extracts time values from binary imported thermal video file

Convective heat coefficient (W/m2/oC)

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.

Colour palette extracted from FLIR thermal camera files

Returns air viscosity for a given air temperature.

Provides the surface are of a cone

Colour palette extracted from FLIR thermal camera files

Colour palette extracted from FLIR thermal camera files

Estimates downward facing longwave radiation (W/m2)

rotate180.matrix

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

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

Colour palette extracted from Mikron thermal camera files

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

Plot thermal image data for visualisation purposes.

airspecificheat

Specific heat capacity of air

Parameters required for free convection equation.

Colour palette extracted from FLIR thermal camera files

airtconductivity

Thermal conductivity of air.

Extracts meta tag information from a FLIR JPG image

Estimates equivalent temperature.

Colour palette extracted from FLIR thermal camera files

Estimates ground temperature from ambient temperature and solar radiation.

Extract raw binary thermal from thermal image file.

Colour palette extracted from FLIR thermal camera files

Saves thermal image data to a binary file

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

Calculate the mean every nth data point.

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

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

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

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.

Colour palette extracted from FLIR thermal camera files

rotate90.matrix

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

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

Colour palette extracted from FLIR thermal camera files

A simplified wrapper function calling ffmpeg

Estimates the area specific heat transfer by conduction (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

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

Return summary of thermal image data.

Colour palette extracted from FLIR thermal camera files

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

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

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

Converts raw thermal data into temperature (oC)

Calculate the slope every nth data point.

Colour palette extracted from FLIR thermal camera files

Converts temperature (oC) to raw thermal data

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

A sample thermal image to demonstrate thermal colour palette use.

Choose a colour palette for gradient filling thermal image files.

Operative temperature estimate.