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A more refined second-order edge detection approach which automatically detects edges with sub-pixel accuracy, uses the following differential approach of detecting zero-crossings of the second-order directional derivative in the gradient direction:
Compare the edge strength of the current pixel with the edge strength of the pixel in the positive and negative gradient directions. If the edge strength of the current pixel is the largest compared to the other pixels in the mask with the same direction (e.g., a pixel that is pointing in the y-direction will be compared to the pixel above and ...
The Knife-Edge Scanning Microscope (KESM) was invented and patented in the late 1990s by Bruce McCormick at Texas A&M University. [1] The microscope is intended to produce high-resolution data sets in order to reconstruct 3D cellular structures .
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Generally this includes 1st-order or 2nd-order neighbors. Set initial probabilities P(f i) > for each feature as 0 or; where f i ∈ Σ is the set containing features extracted for pixel i and define an initial set of clusters. Using the training data compute the mean (μ ℓ i) and variance (σ ℓ i) for each label. This is termed as class ...
Time-lapse embryo imaging is an emerging non-invasive embryo selection technique used in reproductive biology.It is used to help select embryos with lower risk of defects and/or greater potential of implantation.
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X-ray absorption (left) and differential phase-contrast (right) image of an in-ear headphone obtained with a grating interferometer at 60kVp. Phase-contrast X-ray imaging or phase-sensitive X-ray imaging is a general term for different technical methods that use information concerning changes in the phase of an X-ray beam that passes through an object in order to create its images.