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contains 2310 observations of instances from 7 outdoor images

- Type
has 7 types of outdoor images, brickface, cement, foliage, grass, path, sky, and window.

- X1
the column of the center pixel of the region

- X2
the row of the center pixel of the region.

- X3
the number of pixels in a region = 9.

- X4
the results of a line extraction algorithm that counts how many lines of length 5 (any orientation) with low contrast, less than or equal to 5, go through the region.

- X5
measure the contrast of horizontally adjacent pixels in the region. There are 6, the mean and standard deviation are given. This attribute is used as a vertical edge detector.

- X6
X5 sd

- X7
measures the contrast of vertically adjacent pixels. Used for horizontal line detection.

- X8
sd X7

- X9
the average over the region of (R + G + B)/3

- X10
the average over the region of the R value.

- X11
the average over the region of the B value.

- X12
the average over the region of the G value.

- X13
measure the excess red: (2R - (G + B))

- X14
measure the excess blue: (2B - (G + R))

- X15
measure the excess green: (2G - (R + B))

- X16
3-d nonlinear transformation of RGB. (Algorithm can be found in Foley and VanDam, Fundamentals of Interactive Computer Graphics)

- X17
mean of X16

- X18
hue mean

```
data(image)
```

A data frame contains 2310 observations and 19 variables

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