# Phobrain

## Image Analysis 2 - Angles in Picture Space

Results for various image analysis methods applied
to photos by Bill, Elle, Ellen, and Raf&Skot (N~15000).

Image distance analysis.

## Distributions of picture-picture angles

Angles are for difference with respect to the average over all the photos, unless otherwise specified.

#### 2D: 'ab' coordinates of average Lab color (difference vector)

#### 2D: 'ab' coordinates of average Lab color (difference/origin)

#### 2D: 'ab' coordinates of average Lab color

#### 3D: coordinates of average RGB color (difference/origin)

#### 3D: coordinates of average RGB color

#### 4D: Lab 'ab' 2x2 histogram

#### 4D: Hue*Saturation 2x2 histogram

(A 2-bin histogram for hue angle is meaningless for practical purposes, but interesting to compare.)

#### 8D: RGB 2x2x2 histogram

#### 27D: RGB 3x3x3 histogram

#### 64D: RGB 4x4x4 histogram

#### 1,728D: RGB 12x12x12 histogram

#### 13,824D: RGB 24x24x24 histogram

#### 32,768D: RGB 32x32x32 histogram

#### 256D: greyscale histogram

#### 578D: Hue*Saturation 24x24 histogram

*Software*

Lab conversion and distance from formulae on web.

Hue+Sat histograms, Sift, Hog, Surf from BoofCV, Sift/Hog/Surf using a KNN classifier.

Gist distance from OpenIMAJ.

Fractal analysis from IQM.

MultiDimensional Scaling from scikit-learn.

What use to cry for Capricorn? it sails

Across the heart's red atlas: it is found

Only within the ribs, where all the tails

The tempest has are whisking it around.

— Mervyn Peake, Titus Alone