Patched garbage mask border rendering method

Abstract

The invention belongs to the image / video processing technology, and particularly relates to a patched garbage mask border rendering method. The method comprises the following steps of: dividing all Bezier curves in a garbage mask into a plurality of sub segments; determining an external direction of the garbage mask; then calculating external border distances and internal border distances of all segment points according to the information of border points; and finally, drawing an external / internal border and an external / internal angle border corresponding to an initial endpoint of each Bezier curve taken as a unit. The method divides the external / internal border and the external / internal angle border corresponding to the initial endpoint of each Bezier curve into a plurality of triangular patches so that the rendered border is smoother and clearer and the regulation and control of the operation are more flexible.

Description

technical field [0001] The invention belongs to the image / video processing technology, and in particular relates to a patched garbage mask boundary rendering method. Background technique [0002] In image / video processing software, mask processing is a very wide demand when image / video is synthesized or special effects are processed. Usually this mask can be generated by key effects or obtained from a dedicated mask image, but in many cases such a mask is not enough and needs to be used to create a mask by hand drawing. This mask is generally called a garbage mask. [0003] A garbage mask is composed of a number of ordered endpoints (end points), and every two consecutive endpoints form a curve. The forward direction along the sequence of endpoints is called the positive direction, and vice versa is the reverse direction. Each endpoint has two control points (control point), one is the forward control point (forward control point), the other is the reverse control point (b...

AI Technical Summary

Problems solved by technology

The boundary of the grayscale image after filling a closed curve is too rigid, so it is necessary to modify the boundary to make it look smoother. In addition, the length of the boundary transition is generally controlled to make the boundary appear to have a certain thickness. In order to achieve Most of these software often use morphological contraction and expansion algorithms and Gaussian blur processing algorithms, but such implementation methods will cause the entire garbage mask to look too blurry when the blurring degree is relatively large, and its boundaries are relatively fixed. , lack of flexible control ability

Images