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Packt Publishing

Are you looking forward to developing interesting computer vision applications? If yes, then this Learning Path is for you.

Packt’s Video Learning Paths are a series of individual video products put together in a logical and stepwise manner such that each video builds on the skills learned in the video before it.

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Are you looking forward to developing interesting computer vision applications? If yes, then this Learning Path is for you.

Packt’s Video Learning Paths are a series of individual video products put together in a logical and stepwise manner such that each video builds on the skills learned in the video before it.

Computer vision and machine learning concepts are frequently used together in practical projects based on computer vision. Whether you are completely new to the concept of computer vision or have a basic understanding of it, this Learning Path will be your guide to understanding the basic OpenCV concepts and algorithms through amazing real-world examples and projects.

OpenCV is a cross-platform, open source library that is used for face recognition, object tracking, and image and video processing. By learning the basic concepts of computer vision algorithms, models, and OpenCV’s API, you will be able to develop different types of real-world applications.

Starting from the installation of OpenCV on your system and understanding the basics of image processing, we swiftly move on to creating optical flow video analysis and text recognition in complex scenes. You’ll explore the commonly used computer vision techniques to build your own OpenCV projects from scratch. Next, we’ll teach you how to work with the various OpenCV modules for statistical modeling and machine learning. You’ll start by preparing your data for analysis, learn about supervised and unsupervised learning, and see how to use them. Finally, you’ll learn to implement efficient models using the popular machine learning techniques such as classification, regression, decision trees, K-nearest neighbors, boosting, and neural networks with the aid of C++ and OpenCV.

By the end of this Learning Path, you will be familiar with the basics of OpenCV such as matrix operations, filters, and histograms, as well as more advanced concepts such as segmentation, machine learning, complex video analysis, and text recognition.

Meet Your Experts:

We have combined the best works of the following esteemed authors to ensure that your learning journey is smooth:

David Millán Escrivá was eight years old when he wrote his first program on an 8086 PC with Basic language, which enabled the 2D plotting of basic equations. In 2005, he finished his studies in IT through the Universitat Politécnica de Valencia with honors in human-computer interaction supported by computer vision with OpenCV (v0.96).

Prateek Joshi is an artificial intelligence researcher, published author of five books, and TEDx speaker. He is the founder of Pluto AI, a venture-funded Silicon Valley startup building an analytics platform for smart water management powered by deep learning.

Joe Minichino is a computer vision engineer for Hoolux Medical by day and a developer of the NoSQL database LokiJS by night. At Hoolux, he leads the development of an Android computer vision-based advertising platform for the medical industry.

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What's inside

Learning objectives

  • Learn about the computer vision workflows and understand the basic image matrix format and filters
  • Understand the segmentation and feature extraction techniques
  • Learn how to remove backgrounds from a static scene to identify moving objects for video surveillance
  • Use the new opencv functions for text detection and recognition with tesseract
  • Master logistic regression and regularization techniques
  • Solve image segmentation problem using k-means clustering
  • Load models trained with popular deep learning libraries such as caffe

Syllabus

OpenCV 3 by Example

Before we jump into OpenCV functionalities, we need to understand why those functions were built. Let’s understand how the human visual system works so that we can develop the right algorithms.

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Real-life problems require us to use many blocks together to achieve the desired result. So, we need to know what modules and functions to use. Let's understand what OpenCV can do out of the box.

Now that we know what tasks we can do with OpenCV, Let’s see how to get OpenCVupandrunning on various operating systems, viz. Windows, Mac and Linux.

We are going to use CMake to configure and check all the required dependencies of our project. So, let’s learn basic CMake configuration files and creating a library.

CMake has the ability to search our dependencies and external libraries, giving us the facility to build complex projects depending on external components in our projects and by adding some requirements. One of the most important dependency is, of course, OpenCV. Let’s learn how to add it to our projects.

Now that we know managing dependencies, let’s take a look at a bit more complex script. This video we will show us a more complex script that includes subfolders, libraries, and executables, all in only two files and a few lines, as shown in the script.

The most important structure in computer vision is without any doubt the images. The image in computer vision is a representation of the physical world captured with a digital device. Let’s now learn about images and matrices.

After the introduction of matrix, we are ready to start with the basics of the OpenCV code. This video will guide us how to read and write images.

We now know how to read and write images but reading video can be a bit tricky. This video introduces us reading a video and camera with simple example.

We have learned about the Mat and Vec3b classes, but we need to learn about otherclasses as well. In this video, we will learn about the most basic object types required in most of the projects.

In many applications, such as calibration or machine learning, when we are done with the calculations, we need to save the results in order toretrieve them in the next executions. Before we finish this section, we will explore the OpenCV functions to storeand read our data.

OpenCV has its own cross-operating system user interface that allows developers to create their own applications without the need to learn complex libraries for theuser interface. This video will introduce the OpenCV user interface and help us creating a basic UI with OpenCV.

The QT user interface gives more control and options to work with images. Let’s explore the interface and learn how to use it.

Mouse events and slider controls are very useful in Computer Vision and OpenCV. Using these controls, users can interact directly with the interface and change the properties of their input images or variables. However, using these controls can be a bit tricky. Let’s see how to use them.

Now that we have learned how to create normal or QT interfaces and interact with them using a mouse and slider, let’s see how we can create different types of buttons to add more interactivity.

OpenCV includes OpenGL support which is a graphical library that is integrated in graphic cards as a standard. OpenGL allows us to draw from 2D to complex 3D scenes. This video shows us how to use OpenGL support.

Prepare a CMake script file that enables us to compile our project, structure, and executable.

The main graphical user interface can be used in the application to create single buttons.

Histogram is a statistical graphic representation of variable distribution that allows us to understand the density estimation and probability distribution of data.

Image equalization obtains a histogram with a uniform distribution of values.

Lomography is a photographic effect used in different mobile applications, such as Google Camera or Instagram.

The Cartoonize effect creates an image that looks like a cartoon

Isolating different parts or objects in a scene.

Create our new application.

Extract the information from image.

Extract each region of interest of our image where our target objects appear.

Pattern recognition and the learning theory in artificial intelligence and are related to computational statistics.

We will learn how to implement our own application that uses machine learning to classify objectsin a slide tape.

We will be able to recognize different objects to send notifications to a robot or put each one in different boxes.

To extract the features of each object.

It is simply a concatenation of a set of weak classifiers that can be used to create a strong classifier.

You have to avoid huge redundancy during the area computation, to avoid this, we can use integral images.

You have to load the cascade file and use it to detect the faces in an image.

You have to overlay sunglass on face.

You have to track nose, mouth and ears.

The background subtraction technique performs really well where we need to detect moving objects in a static scene.

We cannot keep a static background image that can be used to detectobjects.

Formulating and implementing a mixture of gaussians.

Morphological Image processing is used in processing the shapes of features in the image.

To apply various morphological operators on image.

Understand what characteristics can be used to make our tracking robust and accurate.

We want to randomly pick an object, learn the characteristics of the selected object and track it automatically.

Detect interest points in the image.

Improve the overall quality of image.

Tracking individual feature points across successive frames in the video.

Basics of OCR.

Classification results can be improved greatly if the input text is clear so Adjust the text.

Install Tesseract on Windows or Mac.

Studying tesserct API.

Machine Learning with Open CV and Python

This video gives an overview of the entire course.

Learn about machine learning.

Learn how to extract features.

Extracting features from an image.

Recognize handwritten digits.

Detect pictures containing cars.

Operate car detection.

Operate face recognition.

Operate flower recognition

Operate color quantization.

Operate handwritten digit recognition.

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Activities

Be better prepared before your course. Deepen your understanding during and after it. Supplement your coursework and achieve mastery of the topics covered in Learning Path: OpenCV: Real-Time Computer Vision with OpenCV with these activities:
Review Linear Algebra Fundamentals
Reinforce your understanding of linear algebra, which is essential for understanding image processing and matrix operations in OpenCV.
Browse courses on Linear Algebra
Show steps
  • Review matrix operations such as addition, multiplication, and transposition.
  • Practice solving systems of linear equations.
  • Understand vector spaces and linear transformations.
Read 'Learning OpenCV 3' by Adrian Kaehler and Gary Bradski
Supplement the course material with a comprehensive textbook on OpenCV to deepen your understanding of the library's capabilities.
Show steps
  • Obtain a copy of 'Learning OpenCV 3'.
  • Read the chapters relevant to the course syllabus.
  • Experiment with the code examples provided in the book.
Implement Basic Image Filters
Solidify your understanding of image processing by implementing common image filters from scratch using OpenCV.
Show steps
  • Implement a Gaussian blur filter.
  • Implement a Sobel edge detection filter.
  • Implement a median filter.
  • Compare your implementations with OpenCV's built-in functions.
Four other activities
Expand to see all activities and additional details
Show all seven activities
Study 'Computer Vision: Algorithms and Applications' by Richard Szeliski
Expand your knowledge of computer vision algorithms with a comprehensive textbook that covers the theoretical foundations behind OpenCV.
View Computer Vision on Amazon
Show steps
  • Obtain a copy of 'Computer Vision: Algorithms and Applications'.
  • Read the chapters relevant to the course syllabus.
  • Focus on the theoretical concepts and mathematical formulations.
Build a Simple Object Tracking Application
Apply your knowledge of OpenCV to build a practical application that tracks objects in real-time video.
Show steps
  • Choose an object tracking algorithm (e.g., MeanShift, CamShift).
  • Implement the chosen algorithm using OpenCV.
  • Test the application with different video sources.
  • Optimize the application for performance.
Create a Blog Post on OpenCV Text Recognition
Deepen your understanding of text recognition in OpenCV by writing a blog post explaining the process and techniques involved.
Show steps
  • Research OpenCV's text detection and recognition capabilities.
  • Write a clear and concise blog post explaining the concepts.
  • Include code examples and visualizations.
  • Publish the blog post on a platform like Medium or your own website.
Contribute to an OpenCV Project
Gain practical experience and contribute to the OpenCV community by participating in an open-source project.
Show steps
  • Find an OpenCV-related open-source project on GitHub.
  • Identify a bug or feature request to work on.
  • Fork the repository and implement the fix or feature.
  • Submit a pull request with your changes.

Career center

Learners who complete Learning Path: OpenCV: Real-Time Computer Vision with OpenCV will develop knowledge and skills that may be useful to these careers:
Computer Vision Engineer
A Computer Vision Engineer develops algorithms and software that allow computers to "see" and interpret images, much like the human eye. This role involves designing, developing, and testing computer vision systems for various applications, such as robotics, autonomous vehicles, and image analysis. This course helps build a foundation in OpenCV, a crucial toolkit for computer vision. It covers the basics of image processing, feature extraction, and segmentation, all essential for a computer vision engineer. The course segments on video analysis, and text recognition are highly relevant. Furthermore, the course may be useful for learning how to load models trained with popular deep learning libraries.
Image Processing Specialist
An Image Processing Specialist focuses on manipulating and analyzing digital images to extract useful information or enhance their quality. This role often involves using specialized software and algorithms to perform tasks such as image restoration, segmentation, and feature extraction. This course helps individuals gain expertise in image processing techniques using OpenCV. The course modules directly address fundamental concepts like image matrix formats, filters, segmentation, and feature extraction. Furthermore, completing modules on histogram equalization, cartoon effects, and object isolation helps the specialist develop a comprehensive understanding of image manipulation techniques.
Robotics Engineer
A Robotics Engineer designs, builds, and programs robots for various applications, from manufacturing to exploration. Computer vision plays a crucial role in enabling robots to perceive and interact with their environment. This course helps a robotics engineer integrate computer vision capabilities into robotic systems. The skills learned may be useful for object recognition, tracking, and navigation using OpenCV. Exposure to image processing and machine learning concepts are vital for developing intelligent and adaptive robots. The course's segments covering machine learning techniques, such as classification and regression, can be applied to robot control and decision making.
Artificial Intelligence Developer
An Artificial Intelligence Developer creates intelligent systems that can perform tasks that typically require human intelligence, such as learning, problem-solving, and decision-making. Computer vision is a significant area within AI, enabling machines to understand and interpret visual data. This course may be helpful for individuals to build their skills in computer vision using OpenCV. The course provides exposure to practical applications of AI in image and video processing. The modules on machine learning with OpenCV and Python are invaluable for an artificial intelligence developer, as they cover essential topics like feature extraction, classification, and neural networks.
Machine Learning Engineer
A Machine Learning Engineer designs and develops machine learning algorithms and systems. Machine learning is often combined with computer vision to create systems that can automatically learn from and make predictions based on visual data. This course may be useful for a machine learning engineer because it covers various machine learning techniques in the context of computer vision. The course's content on supervised and unsupervised learning, classification, regression, and neural networks prepares the learner to apply these techniques to image and video analysis problems. It can also build a strong foundation in using OpenCV for machine learning tasks.
Software Developer
A Software Developer designs, develops, and tests software applications. In many industries, software applications now incorporate computer vision capabilities for tasks like image recognition, object detection, and augmented reality. This course may be useful for software developers who want to add computer vision features to their applications. The course covers the fundamental concepts and algorithms of computer vision and provides hands-on experience with the OpenCV library. The course helps equip the software developer with the skills to integrate computer vision functionalities into diverse software projects.
Research Scientist
A Research Scientist conducts research and development activities in various fields, often pushing the boundaries of knowledge and technology. In areas like robotics, medical imaging, and autonomous vehicles, computer vision is a key research area. This course may benefit a research scientist by providing a practical understanding of computer vision techniques and tools. The course's hands on experience with OpenCV, combined with the machine learning concepts, enables the scientist to explore new ideas and develop innovative solutions. The background subtraction techniques covered are quite helpful.
Data Scientist
A Data Scientist analyzes large datasets to extract meaningful insights and patterns. Computer vision generates vast amounts of image and video data, creating a need for data scientists who can apply their skills to visual information. This course may be useful, as it covers fundamental image processing techniques, feature extraction methods, and machine learning algorithms applicable to visual data analysis. The course also helps the learner to process and interpret image data, and build predictive models based on visual features. Understanding k means clustering is very helpful for this role.
Application Developer
Application Developers create software applications for computers and mobile devices, and increasingly these applications incorporate computer vision capabilities. This course may be helpful as it introduces one to the fundamental ideas and approaches to creating applications. The course then helps the learner develop real world applications. Application of OpenCV is explored. Examples include how to use face recognition, how to create special effects, and how to track objects.
Quality Assurance Engineer
A Quality Assurance Engineer ensures the quality of software and hardware products through testing and analysis. Computer vision systems require thorough testing to ensure accuracy and reliability. This course may be useful as it provides exposure to computer vision algorithms and techniques. The course is useful to test and validate computer vision applications. By understanding the underlying principles of computer vision, the learner can design effective test cases and identify potential issues.
Surveillance Systems Manager
A manager oversees the operations and maintenance of surveillance systems, often relying on computer vision technology for automated monitoring and analysis. This course may be helpful if you would like to understand the technologies that are being managed. The course segments on video analysis, object tracking, and anomaly detection are particularly relevant. The material may be useful for understanding how to optimize system performance, troubleshoot issues, and evaluate new technologies.
Medical Imaging Analyst
Medical Imaging Analysts analyze medical images, such as X-rays and MRIs, to assist in diagnosis and treatment planning. Computer vision techniques can automate and enhance image analysis in this field. This course may be useful as it provides a foundation in image processing, segmentation, and feature extraction. These are directly applicable to medical image analysis. Completion of this course may be useful for developing algorithms for image enhancement, automated lesion detection, and quantitative analysis of medical images. A master's degree or doctorate is typically required.
Geospatial Analyst
A Geospatial Analyst uses geographic information systems (GIS) and remote sensing data to analyze spatial patterns and trends. Computer vision can be applied to analyze satellite and aerial imagery. This course may be useful, as it introduces fundamental image processing techniques and feature extraction methods. The course may be useful for developing algorithms for object recognition, change detection, and terrain analysis using geospatial imagery. A bachelor's degree is typically required.
Game Developer
Game Developers create video games for various platforms, and computer vision can be used to enhance gameplay and create more realistic and immersive experiences. This course may be useful, as it introduces you to computer vision techniques that are useful for integration into video games. The segments on object tracking, motion analysis, and augmented reality are relevant. Knowledge obtained from this course may be useful for developing features such as character animation, gesture recognition, and interactive environments.
Digital Marketing Specialist
Digital Marketing Specialists focus on promoting products and services through online channels. Computer vision can be used to analyze images and videos for marketing purposes, such as identifying brand logos and understanding customer engagement. This course may be useful as it provides a basic understanding of image processing and object recognition since those skills are required in effective marketing. Digital marketing specialists can analyze visual content and optimize marketing campaigns.

Reading list

We've selected two books that we think will supplement your learning. Use these to develop background knowledge, enrich your coursework, and gain a deeper understanding of the topics covered in Learning Path: OpenCV: Real-Time Computer Vision with OpenCV.
Provides a comprehensive guide to OpenCV, covering a wide range of topics from basic image processing to advanced computer vision techniques. It serves as an excellent reference for understanding the underlying concepts and practical implementation of OpenCV functions. It is commonly used as a textbook in computer vision courses and by industry professionals. This book adds more depth to the course by providing detailed explanations and examples.
Provides a comprehensive overview of computer vision algorithms and their applications. It covers a wide range of topics, including image formation, feature extraction, segmentation, and object recognition. While not specifically focused on OpenCV, it provides a strong theoretical foundation for understanding the underlying principles behind the library's functions. This book is more valuable as additional reading to provide a broader context.

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