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# 目标分析

## 函数

 `bwboundaries` 跟踪二值图像中的对象边界 `bwtraceboundary` Trace object in binary image `visboundaries` Plot region boundaries
 `imfindcircles` 使用圆形 Hough 变换查找圆 `viscircles` 创建圆
 `edge` 查找二维灰度图像中的边缘 `edge3` Find edges in 3-D grayscale volume `imgradient` 找到二维图像的梯度幅值和方向 `imgradientxy` 查找二维图像的定向梯度 `imgradient3` Find gradient magnitude and direction of 3-D image `imgradientxyz` Find directional gradients of 3-D image
 `hough` Hough 变换 `houghlines` 基于 Hough 变换提取线段 `houghpeaks` 识别 Hough 变换中的峰值 `radon` Radon 变换 `iradon` Inverse Radon transform
 `qtdecomp` Quadtree decomposition `qtgetblk` Block values in quadtree decomposition `qtsetblk` Set 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

Trace the boundaries of a single object or of all objects in a binary image.

• Hough 变换

Hough 变换检测图像中的线条，包括从垂直和水平方向以任意角度倾斜的线条。Hough 变换往往很快，但可能会出现伪影。

• Detect Lines Using 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.