Raster Image - Feature (Image Properties)
About
A feature is property of an image.
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Example
intensity,
color,
texture.
Scope
Global
For the whole image
Local
For a set of pixel.
Local features provide a limited set of well localized and individually identifiable anchor points. Their location must be determined accurately and in a stable manner over time. They can be used as a robust image representation, that allows to recognize
objects or scenes without the need for segmentation. Features need to be described, such that they can be identified and matched.
Example:
points (interest point)
region
edge segment
small image patches
corner,
blob
Usage
edges detected in aerial images often correspond to roads;
blob detection can be used to identify impurities in some inspection task;
matching or tracking applications,
camera calibration or 3D reconstruction.
image alignment or mosaicing
object recognition
scene classification,
texture analysis,
Detection
To localize features in images, a local neighborhood of pixels needs to be analyzed
spatial extent: the local neighborhood of pixels