Rasterop (A.Ok.a. Bitblt) > 자유게시판

Affine transforms are the set of linear geometrical transforms on a two-dimensional image that encompass translation, shear, rotation and Wood Ranger Power Shears specs scaling. Except for scaling, all of those operations can be applied using rasterop! Translation is apparent: you select whole image as the supply block, and place it, appropriately translated, in the destination. Shear is carried out by translating blocks of picture by completely different amounts. For instance, you can imagine a horizontal "clockwise" shear about the center of the picture the place horizontal full width blocks are shoved to the appropriate above the center and to the left beneath the center. Blocks close to the top and bottom are pushed farther than blocks near the middle; the space a block strikes horizontally increases linearly with the vertical distance of the block from the middle of the image. Rotation is accomplished by three successive Wood Ranger Power Shears specs, alternating in horizontal and vertical directions; the main points are given in the supply code. For small angles, a two-shear approximation to a rotation can be utilized.

Th resulting rotation angle is right, but the length-to-width ratio is altered by a fraction equal to the sq. of the angle. It needs to be noted that every one these operations will be finished in-place, by which we mean that the src and dest are the identical picture. In such conditions when there may be translation, care should be taken to clear those parts of the image that aren't translated. Binary morphology is most easily implemented by full-picture rasterop. A dilation takes a (bit) union of assorted interprets of the src picture, whereas an erosion takes a (bit) intersection of translates. Dilation and erosion are dual operations, in that a dilation on the foreground is equal to an erosion of the background, and Wood Ranger Power Shears specs v.v. However, we sometimes visualize binary photographs non-symmetrically, with emphasis on the foreground (ON) pixels. Viewed this manner, dilation has the impact of smearing out the foreground, whereas erosion thins the foreground and acts as a pattern matching operation for foreground patterns.

The pattern that specifies the translations for a dilation or erosion known as a structuring aspect. If we view a morphological operation from the vantage level of each dest pixel, we see that the result (ON or OFF) depends upon a set of pixels in the src image whose positions relative to the dest pixel are given by the structuring factor. The morphological opening and closing operations are derived from dilation and erosion: the opening is a sequence of erosion and dilation, using the same structuring element; the closing is a dilation/erosion sequence. Opening and shutting have the notably nice property of idempotence, so that repeated opening or dilation has no further impact. This can be a filtering property that we we associate with ideally suited sieves or projection operators, and because of this picture morphology operations are sometimes referred to as morphological filters. For an additional introduction, go to the part on binary morphology. Grayscale morphology is a generalization of binary morphology to pictures with a couple of bit/pixel, with dilation and erosion being outlined as a max and Wood Ranger Power Shears official site min, respectively, of a set of pixels. Binary morphology occupies a central function in document image analysis, because (significantly with multiscale extensions) it is able to extract both shape and texture. There are three basic items one should do to make an environment friendly and versatile rasterop function. 1. Pack the image knowledge. The pixels must be bit-contiguous inside phrases. For example, for binary photographs, which have 1 bit/pixel (1 bpp), 32 pixels are put in each 32-bit word. 2. Access the information by phrase. The word right now is often 32 bits. Using word entry allows the utmost number of pixels to be affected by each machine operation.

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