Documentation

This is machine translation

Translated by Microsoft
Mouseover text to see original. Click the button below to return to the English verison of the page.

Note: This page has been translated by MathWorks. Please click here
To view all translated materals including this page, select Japan from the country navigator on the bottom of this page.

Object Analysis

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

Functions

bwboundariesTrace region boundaries in binary image
bwtraceboundaryTrace object in binary image
visboundariesPlot region boundaries
edgeFind edges in intensity image
edge3Find edges in 3-D intensity volume
imfindcirclesFind circles using circular Hough transform
viscirclesCreate circle
imgradient Gradient magnitude and direction of an image
imgradientxy Directional gradients of an image
imgradient3Find 3-D gradient magnitude and direction of images
imgradientxyzFind the directional gradients of a 3-D image
houghHough transform
houghlinesExtract line segments based on Hough transform
houghpeaksIdentify peaks in Hough transform
radonRadon transform
iradonInverse Radon transform
qtdecompQuadtree decomposition
qtgetblkBlock values in quadtree decomposition
qtsetblkSet block values in quadtree decomposition

Topics

Edge Detection

Edge detection is a technique for finding the boundaries of objects within an image.

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.

Was this topic helpful?