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Data Types

In general, there are 4 types of data:

  1. Numerical:
    • Values associated with measurable characteristics
    • Continuous (subject to ordering)
    • Representable as numerical vectors
  2. Categorical:
    • Qualitative characteristics
    • Presence or absence of a characteristic
    • Sometimes subject to sorting
    • Widely used in Data Mining
  3. Sequences:
    • Sequential patterns with spatial or temporal relationships
    • With a variable length
    • Position in the sequence and relationship with predecessors and successors are important
  4. Structured data:
    • Outputs organized in complex structures such as trees and graphs

Images

An image is a matrix of values in which each cell is referred as pixel and each pixel contains the value of the brightness.

In color images, each pixel contains 3 values that represent the color components, referred as channels. The content of channels are related to the color space (the convention used to define colors).

  • RGB color space: 3 values indicate the value of three components (Red, Gree and Blue).

Image formats

Last update: October 12, 2022 13:15:00
Created: October 12, 2022 13:15:00
Authors: Francesca Neri