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Seabed
Analysis
Classified image
Seabed images mosaicked and analyzed.
Seabed images processing and analysis
TerraNor has developed special routines to enhance and balance colours in seabed images. Survey companies use artificial light when they take images in water. Light does not penetrate very far in water. The images tend to be highligted in the center with less light to the sides. Images of contstructions that are 5m deep or more, will have good quality close to the camera and less quality far away. TerraNor has found a solution to this.
 
TerraNor implementation:
TerraNor automatically balances the colour in the images so the whole image receives the same light. See examples below.

Be effective:
Most images can be modified in image software like Photoshop. Our routines are fully automatic and can modify 100 000 images without user involvement. We set the parameters and the rest is automatic.
 
Full control
The operator controls
- the number of control points over the image
- what the middle light value should be after processing
- whether each layer shall be processed separately or use of brightness
- output format 
 
Panchromatic image before and after processing:
Before and after

Orthorectification:
As an option we can orthorectify the images after enhancement. If you want to mosaic the images, you must first orthorectify them. We use the AUV/ROV sensor data to orthrectify the images.
Orthorectification

Original raw image and enhanced and mosaicked
mosaicked

The images below shows mosaic of four rounds with the AUV. Positioning is difficult under water. These data show a difference of 50 cm between each round. This is assumed to be very good.
Mosaic

Colour images
Our routines were designed to handle both Panchromatic and Colour. Below is an image from Statoil LOVE camera. The left is the original and the right is our enhancement
Statoil Lofoten images

This image from Parker Maritime shows how we can solve the problem with dark areas far from the camera and light source.
Parker Maritime

The image of these beautiful corals are taken by Gardline. We see how the coral in the dark areas can be analyzed.
Gardline

Lundin project
These routines would not have been possible without the support of Lundin Norway, Norwegian Gelogical Survey, Norwegian Military Research Institute, Kongsberg Maritime and Norsk Electro Optikk. TerraNor is very thankful to all of them for their support.
 

“Lundin sees the information that is gained through the extensive seabed mapping as relevant to the whole E&P value chain.

 

It provides us with detailed information about local and regional variations in the seabed environment, natural leakage of hydrocarbons from seabed, potential geohazards, and suitability of sea bottom for future seabed installations.”