download_coil100: Download COIL-100
In jlmelville/coil20: Code to Download the COIL 20 Database of Object Images

Description Usage Arguments Format Details Value Note See Also

Download processed COIL-100 database of object images.

1	download_coil100(file = tempfile(), cleanup = TRUE, verbose = FALSE)

`file`	name of file to download to. Defaults to `tempfile`.
`cleanup`	If `TRUE`, then delete any downloaded files when finished.
`verbose`	If `TRUE`, then download progress will be logged as a message.

A data frame with 49153 variables (128 x 128 pixels for each of the three channels):

r_x1_y1, r_x1_y2, ... r_x1_128, r_x2_y1 ... r_x128_y128: Pixel values in the red channel ranging from 0 to 1. The x index increases from left to right, and the y index increases from top to bottom, i.e. r_x1_y1 is top left and r_x128_y128 is the bottom right.
g_x1_y1, g_x1_y2, ... g_x1_128, g_x2_y1 ... g_x128_y128: Pixel values in the green channel ranging from 0 to 1. The x index increases from left to right, and the y index increases from top to bottom, i.e. g_x1_y1 is top left and g_x128_y128 is the bottom right.
b_x1_y1, b_x1_y2, ... b_x1_128, b_x2_y1 ... b_x128_y128: Pixel values in the blue channel ranging from 0 to 1. The x index increases from left to right, and the y index increases from top to bottom, i.e. b_x1_y1 is top left and b_x128_y128 is the bottom right.
Label: The id of the object represented by the image, in the range 1-100. Stored as a factor.

The name of each row in the data frame is in the form "<obj>_<angle>", where <obj> is the id of the object (numbered from 1 to 20) and <angle> is the viewing angle in degrees (numbered from 0 to 355). e.g. "5_150" is the fifth object viewed at an angle of 150 degrees.

Downloads and expands the zip file of the processed COIL-100 database of object images and converts them to a data frame. There are 100 objects, each represented by 72 poses, in an RGB PNG format. Each image has a resolution of 128 x 128.

Data frame containing the COIL-100 database.

This function requires the png package https://cran.r-project.org/web/packages/png/ to be installed.

For more information see http://www.cs.columbia.edu/CAVE/software/softlib/coil-100.php.

jlmelville/coil20 documentation built on May 19, 2019, 12:47 p.m.