Range of values for images

[zneha]

Just wondering, are the image pixels values in range [0 255] for all image encodings (Gaf, Mtf, RecPlot)?

[johannfaouzi]

Hi,

The pixel values are not in range [0, 255] because they are not standard images.

Gramian Angular Field

The values of a GAF image are in range [-1, 1] (see their formulas):

Markov Transition Field

The values of a MTF image are in range [0, 1] as each entry represents a probability:

Recurrence Plot

The values of a RP image are (depending on the value of the threshold parameter):

• non-negative floats because they represent the Euclidean distance between two trajectories;
• 0 or 1 when the Euclidean distance is binarized (lower or higher than the threshold).

Let me know if it is clear enough or not.