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Object Analysis

Detect edges, circles and lines; trace boundaries; perform quadtree decomposition


bwboundaries Trace region boundaries in binary image
bwtraceboundary Trace object in binary image
visboundaries Plot region boundaries
edge Find edges in intensity image
imfindcircles Find circles using circular Hough transform
viscircles Create circle
imgradient Gradient magnitude and direction of an image
imgradientxy Directional gradients of an image
imgradient3 Find 3-D gradient magnitude and direction of images
imgradientxyz Find the directional gradients of a 3-D image
hough Hough transform
houghlines Extract line segments based on Hough transform
houghpeaks Identify peaks in Hough transform
qtdecomp Quadtree decomposition
qtgetblk Block values in quadtree decomposition
qtsetblk Set block values in quadtree decomposition


Edge Detection

An edge is a curve that follows a path of rapid change in image intensity.

Boundary Tracing in Images

The Image Processing Toolbox™ includes two functions to find the boundaries of objects in a binary image.

Hough Transform

The Image Processing Toolbox supports functions that enable you to use the Hough transform to detect lines in an image.

Detect Lines Using the Radon Transform

This example shows how to detect lines in an image using the radon function.

Quadtree Decomposition

Quadtree decomposition subdivides an image to reveal information about the image structure.

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