The R program, "theta2svf_basic_revised.R"
can convert Theta image (equidistant cylindrical projection) to fisheye image (equidistant and equal-area projection) and
binarize the images to calculate sky view factor.
Theta can be used as the fisheye lens camera by the method of this program.
The following input file is used.
example.jpg: Theta image (equidistant cylindrical projection) used as input file.
Following output files are made.
example_dist.png: fisheye image of equidistant projection
example_dist_bi.png: binarized bw fisheye image of equidistant projection
example_area.png: fisheye image of equal-area projection
example_area_bi.png: binarized bw fisheye image of equal-area projection
example_area_svf.txt: sky view factor calculated from binarized fisheye image of equal-area projection
To run the program, place the "theta2svf_basic_revised.R" and "example.jpg" in the same folder.
In "theta2svf_basic_revised.R", following line should be changed
Please change the directry in line 9 like, "setwd("/Users/honjo/Desktop/test_folder")" which is the folder name for test.
Also the following values of the parameter are changed if necessary.
xth<-0.6 #threshold value in making binary images
#rgb ratio
r_ratio<-1
g_ratio<-1
b_ratio<-1
copyright 2017(c) Tsuyoshi Honjo