Images

The images used in the experiments can be downloaded here: images.zip. The dataset is composed of the same classes that make up the OUTEX_TC_00013 test suite, but the images used in our experiments have been previously colour-calibrated and converted into the sRGB space through the procedure described in [1].

The data are arranged in nine subdirectories, one for each rotation angle: images/00, images/05, images/10, etc. In each subdirectory there are 1360 images from 68 classes (20 images for each class). The resolution of each image is 128 x 128.

[1] F. Bianconi, A. Fernández, E. González, D. Caride and A. Calviño; Rotation-invariant colour texture classification through multilayer CCR; Pattern Recognition Letters, 30(8), pp. 765-773, 2009;

Train and test numbers for accuracy estimation

Estimation of accuracy is described in Section 4.2 of the manuscript. To reproduce the results reported in the paper, one needs the same train and test numbers used in the experiments. These are matrices of dimension 100 x 680. Each row represents one classification problem. The indices of each row of the train (test) matrix state which images are used for training (testing) in that particular problem.

Let's look at the following examples. Consider the first problem (first row of the matrices). The train numbers are: 2, 3, 4, 7, 8, 10, etc. The test numbers are: 1, 5, 6, 9, etc. We indicate in red the images used for training, in blue the images used for testing.

Example 1: estimation of accuracy at 0°

1 barleyrice001-inca-100dpi-00_1.bmp
2 barleyrice001-inca-100dpi-00_10.bmp
3 barleyrice001-inca-100dpi-00_11.bmp
4 barleyrice001-inca-100dpi-00_12.bmp
5 barleyrice001-inca-100dpi-00_13.bmp
6 barleyrice001-inca-100dpi-00_14.bmp
7 barleyrice001-inca-100dpi-00_15.bmp
8 barleyrice001-inca-100dpi-00_16.bmp
9 barleyrice001-inca-100dpi-00_17.bmp
10 barleyrice001-inca-100dpi-00_18.bmp
...

Example 2: estimation of accuracy at 15°

1 barleyrice001-inca-100dpi-15_1.bmp
2 barleyrice001-inca-100dpi-00_10.bmp
3 barleyrice001-inca-100dpi-00_11.bmp
4 barleyrice001-inca-100dpi-00_12.bmp
5 barleyrice001-inca-100dpi-15_13.bmp
6 barleyrice001-inca-100dpi-15_14.bmp
7 barleyrice001-inca-100dpi-00_15.bmp
8 barleyrice001-inca-100dpi-00_16.bmp
9 barleyrice001-inca-100dpi-15_17.bmp
10 barleyrice001-inca-100dpi-00_18.bmp
...