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  • iOS Application Development with OpenCV 3
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iOS Application Development with OpenCV 3

iOS Application Development with OpenCV 3

By : Joseph Howse
4 (5)
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iOS Application Development with OpenCV 3

iOS Application Development with OpenCV 3

4 (5)
By: Joseph Howse

Overview of this book

iOS Application Development with OpenCV 3 enables you to turn your smartphone camera into an advanced tool for photography and computer vision. Using the highly optimized OpenCV library, you will process high-resolution images in real time. You will locate and classify objects, and create models of their geometry. As you develop photo and augmented reality apps, you will gain a general understanding of iOS frameworks and developer tools, plus a deeper understanding of the camera and image APIs. After completing the book's four projects, you will be a well-rounded iOS developer with valuable experience in OpenCV.
Table of Contents (7 chapters)
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Preface
Preface
What this book covers
What you need for this book
Who this book is for
Conventions
Reader feedback
Customer support
Free Chapter
1
1. Setting Up Software and Hardware
1. Setting Up Software and Hardware
Setting up Apple's developer tools
Setting up the OpenCV framework
Developing a minimal application
Distributing to testers and customers
Finding documentation and support
Understanding the camera and setting up photographic accessories
Summary
2
2. Capturing, Storing, and Sharing Photos
2. Capturing, Storing, and Sharing Photos
Planning a photo sharing application
Configuring the project
Defining and laying out the view controller
Controlling the camera
Working with various color formats
Starting and stopping the busy mode
Saving an image to the Photos library
Displaying an alert
Sharing an image via social media
Running the application
Summary
3
3. Blending Images
3. Blending Images
Thinking about hybrid images
Planning the blending controls
Expanding the view controller's interface
Expanding the view controller's implementation
Using the application for practical purposes
Summary
4
4. Detecting and Merging Faces of Mammals
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4. Detecting and Merging Faces of Mammals
Understanding detection with cascade classifiers
Understanding transformations
Planning a face merging application
Configuring the project
Defining faces and a face detector
Defining and laying out the view controllers
Detecting a hierarchy of face elements
Aligning and blending face elements
Using the application and acting like a cat
Learning more about face analysis
Summary
5
5. Classifying Coins and Commodities
5. Classifying Coins and Commodities
Understanding blob detection
Understanding histogram analysis
Understanding keypoint matching
Planning an object classification application
Configuring the project
Defining blobs and a blob detector
Defining blob descriptors and a blob classifier
Laying out the splash screen
Defining and laying out the view controllers
Detecting blobs against a plain background
Classifying blobs by color and keypoints
Using the application and testing the tough cases
Taking your study of OpenCV to the next level
Summary
6
Index
Index

Understanding detection with cascade classifiers

A cascade is a series of tests or stages, which differentiate between a positive and negative class of objects, such as face and non-face. For a positive classification, a patch of an image must pass all stages of the cascade. Conversely, if the patch fails any stage, the classifier immediately makes a negative classification.

A patch or window of an image is a sample of pixels around a given position and at a given magnification level. A cascade classifier takes windows of the image at various positions and various magnification levels, and for each window it runs the stages of the cascade. Often, positive detections occur in multiple, overlapping windows. These overlapping positive detections are called neighbors, and they imply a greater likelihood of a true positive. For example, a real face still looks like a face if we move or resize the frame around it slightly.

By now, you might be wondering exactly how we design a cascade's stages....

End of Section 5
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