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A matrix wipe is a patterned transition between two images. The matrix wipe can be various patterns such as a grid, stars, etc. A clock wipe is a wipe that sweeps a radius around the center point of the frame to reveal the subsequent shot, like the sweeping hands of an analog clock. Because of this similarity, it is often used to indicate that ...
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This example describes a vertical line wipe, though this is but one type of wipe. Another common type of wipe uses objects in the scene, rather than an invisible vertical line. One interesting application of this creates the illusion of a camera passing through the ceiling of the bottom floor of a multi-story house to the ground of the floor above.
A linear, or axial, color gradient. In color science, a color gradient (also known as a color ramp or a color progression) specifies a range of position-dependent colors, usually used to fill a region. In assigning colors to a set of values, a gradient is a continuous colormap, a type of color scheme.
The pixels with the largest gradient values in the direction of the gradient become edge pixels, and edges may be traced in the direction perpendicular to the gradient direction. One example of an edge detection algorithm that uses gradients is the Canny edge detector. Image gradients can also be used for robust feature and texture matching.
As for the vote weight, pixel contribution can either be the gradient magnitude itself, or some function of the magnitude. In tests, the gradient magnitude itself generally produces the best results. Other options for the vote weight could include the square root or square of the gradient magnitude, or some clipped version of the magnitude. [5]
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