Dominant Colour

Datarock’s product Dominant Colour, which generates a single colour output that allows for a simple colour representation of each row image and is a particularly useful output that most 3D modelling packages can handle.

Background

To identify a colour that best represents an image, we need to understand that colour can be numerically represented in many ways (Color model ), called colour models. When an image, stored as a jpg or png or other file format, is loaded into a computer, the colour of each pixel can be numerically represented by passing saved information to any of these colour models.

One of the most intuitive colour models to think about is the RGB model (RGB color model ), where the red, green and blue primary colours of light are added together to form a distinct colour. Using this model, the colour of each pixel in our loaded image is therefore defined by an RGB triplet (R,G,B) of numerical information.

The purpose of the Datarock Dominant Colour product is to condense the varied colours represented in the core photograph to consistently determine the dominant colour of the core.

Dependent Models

The imagery only needs to have passed through Depth Registration in order to process Dominant Colour.

Data Processing

The following steps are taken to determine the Dominant Colour of a row image.

1. Taking the depth registered row image (see Analytics Ready Data (Image Preparation + Depth Registration) for more information).

2. Extract every pixel from the image, and plot each RGB triplet onto a 3 axis plot.

3. Cluster all the RGB values into five clusters.

4. Determine the cluster with the highest number of pixels. This is the dominant cluster.

5. Find the geometric centre of the dominant cluster. The R, G and B values of this point is our Dominant Colour.

6. Convert the RGB value to hex and export both.

Example output

The images below show an example of the extracted row images. Key points:

• Hole is 1,116m deep

• Raw images were 380 megabytes

• Processed data (csv format) is ~100KB

This results in a significantly compressed representation of the core images that can be used to plot in 3D modelling packages or further data analysis.

Depth registered row images	Dominant colour row images

Product Configuration Options

There are no configuration aspects to this product.

Output Intervals

Data intervals are based on the calculated depth of each row image.

User Data

Not currently able to upload to the platform.

Data Output

Results from this product is delivered in a batch nature.

Integration of the required technologies into Datarock production is ongoing.

The available CSV files include the following:

• ProjectID_Dominant_Colour.csv

Product Limitations