2 D Matrix Data 2 D Twodimensional data

2 D Matrix Data 2 D

Two-dimensional data has two location indicators for each data point If the location indicators are evenly spaced, the data can easily be stored as a 2 D Matrix file.

Two-dimensional data has two location indicators for each data point X 0. 5 1. 0 1. 5 Y 0. 5 1. 0 1. 5 speed 0. 0350 0. 0714 0. 3853 0. 4911 0. 2422 0. 9207 0. 5744 0. 3305 0. 8485

Two-dimensional data has two location indicators for each data point X Y 0. 5 1. 0 1. 5 0. 0350 0. 0714 0. 3853 1. 0 0. 4911 0. 2422 0. 9207 1. 5 0. 5744 0. 3305 0. 8485

Organization of 2 D Matrix files There is no standard layout for 2 D matrix files Some standard file formats which use binary storage of data: HDF net. CDF FITS TIFF

Images as 2 D Matrix files The most common form of 2 D matrix file is the digital image. Remember that the pixel values or intensities in an image may represent: • intensity • density • temperature • pressure • some other measurement taken on a regular grid.

Common Enhancement Techniques for Images - look up table transformations - histogram modifications - geometric transformations - filtering

Identity Transformation transformed pixel value TRANSFORMATION FUNCTION original pixel value

Photographic Negatives transformed pixel value TRANSFORMATION FUNCTION original pixel value

Photographic Negatives:

Thresholding transformed pixel value TRANSFORMATION FUNCTION original pixel value

Thresholding

Contrast Stretching transformed pixel value TRANSFORMATION FUNCTION LO HI original pixel value

Contrast Stretching

Grey level Distribution plotted as a Histogram

Grey level Distribution plotted as a Histogram

Grey level Distribution plotted as a Histogram