They are called "weak" characters because they do not contain any directional information.
Starting from these, using the directional information derived earlier, edges can be traced through the image.
An illuminated sign system provides directional information for taxiing aircraft.
The particle velocity is a vector and thus also contains directional information.
A single vibrator, however, would make it difficult to communicate directional information to the user.
The efforts were aimed primarily at determining the origin of the bursts through precise directional information established by such a network.
The ability to detect polarized light may provide better contrast and/or directional information for migrating species.
This provides not only directional but also information on the time of day.
By the ancient definition however, directional information and magnitude were conceptually distinct.
Post-processing programs are able to extract this directional information.