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Let X be an affine space over a field k, and V be its associated vector space. An affine transformation is a bijection f from X onto itself that is an affine map; this means that a linear map g from V to V is well defined by the equation () = (); here, as usual, the subtraction of two points denotes the free vector from the second point to the first one, and "well-defined" means that ...
Equivalently, affine shape adaptation can be accomplished by iteratively warping a local image patch with affine transformations while applying a rotationally symmetric filter to the warped image patches. Provided that this iterative process converges, the resulting fixed point will be affine invariant.
Warping boards come in a variety of shapes, from the two nearest door handles to a board with pegs on it, or a device called a warping mill that looks similar to a swift. [10] Warping the loom, mean threading each end through an eye in a heddle, and then sleying it through the reed. The warp is set (verb) at X ends per inch.
The vertical warp yarns are held stationary in tension on a loom (frame) while the horizontal weft (also called the woof) is drawn through (inserted over and under) the warp thread. [1] In the terminology of weaving, each warp thread is called a warp end ; a pick is a single weft thread that crosses the warp thread (synonymous terms are fill ...
The word dobby is a corruption of "draw boy," which refers to the weaver's helpers who used to control the warp thread by pulling on draw threads. A dobby loom is an alternative to a treadle loom. Both are floor looms in which every warp thread on the loom is attached to a single shaft using a device called a heddle. A shaft is sometimes known ...
Georgia Bonesteel is a quilting judge, author and host of the show. She has been the president of the International Quilt Association, which is involved in the history and art of quilting worldwide. [6] Bonesteel is credited with having invented lap quilting while teaching a class at Blue Ridge Community College in North Carolina. [2]
Longarm quilting is the process by which a longarm sewing machine is used to sew together a quilt top, quilt batting and quilt backing into a finished quilt.. A complete longarming system typically consists of a sewing machine head, a frame, a table with a layer of plastic (under which is placed a pantograph), and several rollers on which the fabric layers and batting are attached.
Holding the reed beater bar in the left hand, and the (picking-stick-mounted) string tugged to return the flying shuttle in the right hand.See video below. In a typical frame loom, as used previous to the invention of the flying shuttle, the operator sat with the newly woven cloth before them, using treadles or some other mechanism to raise and lower the heddles, which opened the shed in the ...