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目标分析

检测边缘、圆和线条;跟踪边界;执行四叉树分解

在图像中,边缘是一条曲线,其走势与图像中强度快速变化的路径一致。边缘通常与场景中目标的边界相关联。工具箱提供了适合检测直线、圆形目标或任意形状区域边缘的不同算法。您也可以检测没有边缘的同构数据块。

函数

全部展开

bwboundaries跟踪二值图像中的区域边界
bwtraceboundaryTrace object in binary image
visboundariesPlot region boundaries
imfindcirclesFind circles using circular Hough transform
viscirclesCreate circle
edge查找强度图像的边缘
edge3Find edges in 3-D intensity volume
imgradientFind gradient magnitude and direction of 2-D image
imgradientxyFind directional gradients of 2-D image
imgradient3Find gradient magnitude and direction of 3-D image
imgradientxyzFind directional gradients of 3-D image
houghHough 变换
houghlines基于 Hough 变换提取线段
houghpeaksIdentify peaks in Hough transform
radonRadon 变换
iradonInverse Radon transform
qtdecompQuadtree decomposition
qtgetblkBlock values in quadtree decomposition
qtsetblkSet block values in quadtree decomposition

主题

边缘检测

边缘检测是一种在图像中寻找对象边界的方法。

Boundary Tracing in Images

You can display the boundaries of a single object or of all objects in an image.

Hough Transform

The Hough transform detects lines in an image, including lines tilted at arbitrary angles from vertical and horizontal. The Hough transform tends to be quick, but can exhibit artifacts.

Detect Lines Using the Radon Transform

This example shows how to detect lines and identify the strongest lines in an image using the Radon transform.

Quadtree Decomposition

Quadtree decomposition is useful as a first step in adaptive image compression. The decomposition involves subdividing an image into homogenous blocks.

特色示例