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用户手册opencv2.4.6_user
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2013-07-12
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用户手册opencv2.4.6_user,最新版本,目前。官方英文PDF。
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The OpenCV User Guide
Release 2.4.6.0
July 01, 2013
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CONTENTS
1 Operations with images 1
1.1 Input/Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 Basic operations with images . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2 Features2d 5
2.1 Detectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2 Descriptors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.3 Matching keypoints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3 HighGUI 9
3.1 Using Kinect and other OpenNI compatible depth sensors . . . . . . . . . . . . . . . . . . . . . . . 9
4 Cascade Classifier Training 13
4.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.2 Training data preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.3 Cascade Training . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Bibliography 19
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CHAPTER
ONE
OPERATIONS WITH IMAGES
1.1 Input/Output
Images
Load an image from a file:
Mat img = imread(filename)
If you read a jpg file, a 3 channel image is created by default. If you need a grayscale image, use:
Mat img = imread(filename, 0);
Note: format of the file is determined by its content (first few bytes)
Save an image to a file:
imwrite(filename, img);
Note: format of the file is determined by its extension.
Note: use imdecode and imencode to read and write image from/to memory rather than a file.
XML/YAML
TBD
1.2 Basic operations with images
Accessing pixel intensity values
In order to get pixel intensity value, you have to know the type of an image and the number of channels. Here is an
example for a single channel grey scale image (type 8UC1) and pixel coordinates x and y:
1
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