Rad_Temp: ReVuePro: Rad_Temp

In joshuakrobertson/R-Package_ReVuePro: ReVuePro: Enabling analysis of thermal images captured by FLIRs VuePro R

Description

A function to convert raw radiance values from radiometric JPGs - captured with a FLIR Vue Pro - to temperature, in degrees Celcius.

Usage

Rad_Temp(
  x,
  Planck_R1 = 17096.453125,
  Planck_R2 = 0.04351538,
  Planck_B = 1428,
  Planck_F = 1,
  Planck_O = -55,
  emissivity = 0.98,
  obj_distance = 1,
  amb_temp,
  ref_temp = amb_temp,
  window_temp = amb_temp,
  wind_transmittance = 1,
  humidity
)

Arguments

x	A string of radiance values in kilowats/metre squared (kW/m2), to be converted to temperature in degrees Celcius.
Planck_R1	A callibration constant, specific per FLIR camera. This can be determined using 'exiftool.exe', produced by Phil Harvey. Default is 17096.453125.
Planck_R2	A callibration constant, specific per FLIR camera. This can be determined using 'exiftool.exe', produced by Phil Harvey. Default is 0.04351538.
Planck_B	A callibration constant, specific per FLIR camera. This can be determined using 'exiftool.exe', produced by Phil Harvey. Default is 1428.0.
Planck_F	A callibration constant, specific per FLIR camera. This can be determined using 'exiftool.exe', produced by Phil Harvey. Default is 1.0.
Planck_O	A callibration constant, specific per FLIR camera. This can be determined using 'exiftool.exe', produced by Phil Harvey. Default is -55.0.
emissivity	The relative energy that is emitted (or radiated) from the surface of the object in the image, compared to that emitted from a blackbody in equivalent conditions. This value must lay between 0 and 1. Default is 0.98.
obj_distance	The distance between the thermal imaging camera and object to be measured within the image. This value is expressed in metres. Default is 1.0 metres.
amb_temp	Ambient/atmospheric temperature at the time of image capture, in degrees Celcius.
ref_temp	The temperature reflected from the object in question - again, in degrees Celcius. Default is to assume that the reflected temperature is equal to ambient temperature.
window_temp	The temperature of window though which the thermal image was take, in degrees Calcius. Default is to assume that window temperature is equal to ambient temperature.
wind_transmittance	The relative amount of light transmitted though a window between the thermal imaging camera and object in question. This value must lay between 0 and 1, with a default value of 1.
humidity	Relative, atmospheric humidity at the time if image character. This value is expressed as a percentage, and therefore should lay between 0 and 100.

Examples

## Reading in binary version of FLIR JPG, and decrypt
setwd("C:/MyRawJPGs")
RmFlirTag("ABird.jpg", "C:/MyProcessedJPGs")

## Determining length of radiance data, within binary JPG.
# Image dimensions = 336 x 256
Imagelength = (336*256)*2

## Extracting binary pertaining to radiance data, and converting
Image = Tagless[2723:(2722+Imagelength)]
TempString = Rad_Temp(Image, Planck_R1 = 17096.453125, Planck_R2 = 0.04351538, Planck_B = 1428.0, Planck_F = 1,
             Planck_O = -55.0, emissivity = 0.98, obj_distance = 1.0, amb_temp = 23.0, humidity = 30).

joshuakrobertson/R-Package_ReVuePro documentation built on June 2, 2020, 8:23 p.m.