Terms
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MATLAB Definition
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Aligned image
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The output image after registration has been performed. The output image is derived by applying a transformation to the input image (see below) that brings it into alignment with the base image (see below).
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Base image
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This is the image against which you compare the image to be registered. It is also often called the reference image.
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Control point pairs
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Matching locations, also referred to as landmarks, in the input image and the base image.
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Distortion
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The differences in one image as compared to another of the same subject. These may have occurred as a result of terrain relief and other changes in perspective when imaging the same scene from different viewpoints, lens and other internal sensor distortions, or differences between sensors and sensor types.
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Global transformation
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A transformation in which a single mathematical expression applies to an entire image.
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Input image
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This refers to the image that you wish to register. It is often called the observed image.
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Local transformation
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A transformation in which different mathematical expressions (usually differing in parameters rather than form) apply to different regions within an image.
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Spatial transformation
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The mapping of locations of points in one image to new locations in another image.
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