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Image contour meaning1/22/2024 Offset is noted concerning the previous point. Where a - point offset on x axis, and b - offset on y axis. Then, the contour is scanned (is admissible - clockwise), and each vector of offset is noted by a complex number a+ib. On a contour, the point which is called as starting point is fixed. Instead, in a CA the contour is encoded by the sequence consisting of complex numbers. But all these formats of coding are not used in a CA. In systems of computer vision, some formats of coding of a contour are used - the code of Freeman, two-dimensional coding, polygonal coding are most known. The contour is a boundary of object, a population of points (pixels), separating object from a background. The Main ConceptsĪt first, we define such an object contour. CA methods are invariant to these transformations. It restricts area of applicability of algorithms of a CA, but reviewing only contours allows to pass from two-dimensional space of the image - to space of contours and by that to lower computing and algorithmic complexity.ĬA allows to effectively solve the main problems of a pattern recognition - transposition, turn and a rescaling of the image of object. Interior points of the object are not accepted to attention. It is supposed that the contour contains the necessary information on the object shape. The CA allows to describe, store, compare and find the objects presented in the form of the exterior outlines - contours. Part 1: Bases of the Contour Analysis What is Necessary for the Contour Analysis (CA) The third part describes C# library ContourAnalysis. In the same place results of work of algorithms are brought, problems and deficiencies of the given method are described. The second part of the article is devoted to it. In the core, it concerns some aspects of the theory, and also problems of optimization of algorithms of the contour analysis. I tried to select the principal moments which allow to understand quickly enough an essence of the contour analysis, and to begin its application in practice. The first part of the article contains the main definitions and theorems of the contour analysis. The article also includes library for operation with the contour analysis, and a demo-example. The article describes the theoretical bases of the contour analysis and aspects of its practical application for image recognition. When combined with a consistent use of value, the illusion of form in a drawing or painting is easily achieved.Source code and demo include all needed OpenCV libs. The strokes that are made with a pencil or a brush should flow in harmony with the cross contours of the subject and in turn, communicate more about the form of the object. This is true for any drawing or painting medium. Just like if you were to run your finger over the form, these strokes will change direction in the same manner. The brush strokes or marks made with a drawing medium are more effective in communicating the form of the subject if they flow with the cross contour lines. While cross contour lines can flow in generally any direction, in most circumstances, you'll want to consider lines that flow vertically or horizontally around the form. This concept is important in communicating form in your drawings and paintings and can help you make smart decisions regarding the direction of your stroke - whether it be with a pencil, pen, or brush. There is practical reason for understanding cross contour lines. How Cross Contour Lines Can Improve Your Drawing and Painting
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