Download 2-D and 3-D Image Registration: for Medical, Remote Sensing, by A. Ardeshir Goshtasby PDF

By A. Ardeshir Goshtasby

A definitive and entire evaluate of present literature and the main leading edge applied sciences within the box of snapshot registration. rather well geared up and written. vital for laptop experts.

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Extra info for 2-D and 3-D Image Registration: for Medical, Remote Sensing, and Industrial Applications

Example text

In a method described by Goshtasby [155], gradient magnitude at each pixel is determined and connected pixels with gradient magnitudes above a threshold value are formed into regions. The regions are partitioned into elongated subregions and a curve is fitted to each subregion. Consider a region that is formed by high-gradient pixels in an image. The region may correspond to a complex structure with many branches and loops. First, such a region is subdivided into simple ones, each containing only very short branches.

The weight at a point may be set to the gradient magnitude at the point to ensure that the obtained curve passes closer to points with higher gradient magnitudes. Since images come from a variety of scanners, have different levels of noise, and are in different resolutions, the employed edge detection method should have 30 PREPROCESSING parameters that can be adjusted to these image variations. This curve-fitting method has three parameters that can be varied to meet these needs. 1. The gradient threshold g, which selects the pixels in a region.

The weight at a point may be set to the gradient magnitude at the point to ensure that the obtained curve passes closer to points with higher gradient magnitudes. Since images come from a variety of scanners, have different levels of noise, and are in different resolutions, the employed edge detection method should have 30 PREPROCESSING parameters that can be adjusted to these image variations. This curve-fitting method has three parameters that can be varied to meet these needs. 1. The gradient threshold g, which selects the pixels in a region.

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