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  2. Image subtraction - Wikipedia

    en.wikipedia.org/wiki/Image_subtraction

    This method can show things in the image that have changed position, brightness, color, or shape. For this technique to work, the two images must first be spatially aligned to match features between them, and their photometric values and point spread functions must be made compatible, either by careful calibration, or by post-processing (using ...

  3. Image derivative - Wikipedia

    en.wikipedia.org/wiki/Image_derivative

    Image derivatives can be computed by using small convolution filters of size 2 × 2 or 3 × 3, such as the Laplacian, Sobel, Roberts and Prewitt operators. [1] However, a larger mask will generally give a better approximation of the derivative and examples of such filters are Gaussian derivatives [ 2 ] and Gabor filters . [ 3 ]

  4. Connected-component labeling - Wikipedia

    en.wikipedia.org/wiki/Connected-component_labeling

    Connected-component labeling (CCL), connected-component analysis (CCA), blob extraction, region labeling, blob discovery, or region extraction is an algorithmic application of graph theory, where subsets of connected components are uniquely labeled based on a given heuristic.

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  6. Image destriping - Wikipedia

    en.wikipedia.org/wiki/Image_destriping

    Image destriping is the process of removing stripes or streaks from images and videos without disrupting the original image/video. These artifacts plague a range of fields in scientific imaging including atomic force microscopy , [ 2 ] light sheet fluorescence microscopy , [ 3 ] and planetary satellite imaging .

  7. Surgery theory - Wikipedia

    en.wikipedia.org/wiki/Surgery_theory

    Surgery is symmetric in the sense that the manifold M can be re-obtained from M′ by a ()-surgery, the trace of which coincides with the trace of the original surgery, up to orientation. In most applications, the manifold M comes with additional geometric structure, such as a map to some reference space, or additional bundle data.

  8. Alpins method - Wikipedia

    en.wikipedia.org/wiki/Alpins_method

    [2] [12] [13] The method provides a consistent, logical approach to quantifying and comparing the success of various refractive surgical procedures, and refining/planning surgery to achieve even better results, both in individuals and groups of individuals receiving refractive surgery. The Alpins Method has been used in some research studies of ...

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