Images with higher resolution contain richer spatial information.
The spectral differences of neighboring pixels within an object increase gradually. Pixel-based methods may pay too much attention to the details of an object when processing high resolution images, making it difficult to obtain overall structural information about the object.
In order to use spatial information
to detect shadows, image segmentation is needed. We adopt
convexity model (CM) constraints for segmentation [27], [28].
Traditional image segmentation methods are likely to result
in insufficient segmentation, which makes it difficult to separate
shadows from dark objects. The CM constraints can improve
the situation to a certain degree. To make a further distinction
between shadows and dark objects, color factor and shape factor
have been added to the segmentation criteria. The parameters of
each object have been recorded, including grayscale average,
variance, area, and perimeter. The segmentation scale could
be set empirically for better and less time-consuming results,
or it could be adaptively estimated according to data such as
resolution.
Images with higher resolution contain richer spatial information.
The spectral differences of neighboring pixels within an object increase gradually. Pixel-based methods may pay too much attention to the details of an object when processing high resolution images, making it difficult to obtain overall structural information about the object.
In order to use spatial information
to detect shadows, image segmentation is needed. We adopt
convexity model (CM) constraints for segmentation [27], [28].
Traditional image segmentation methods are likely to result
in insufficient segmentation, which makes it difficult to separate
shadows from dark objects. The CM constraints can improve
the situation to a certain degree. To make a further distinction
between shadows and dark objects, color factor and shape factor
have been added to the segmentation criteria. The parameters of
each object have been recorded, including grayscale average,
variance, area, and perimeter. The segmentation scale could
be set empirically for better and less time-consuming results,
or it could be adaptively estimated according to data such as
resolution.
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