
Learn to set up PyCharm Community Edition for OpenCV projects, install OpenCV Python and NumPy via pip, configure the interpreter, and verify a ready OpenCV environment.
Learn to read images in OpenCV with Python using cv2.imread, understand grayscale, color, and unchanged flags, display with imshow, pause with waitKey, and destroy all windows.
Learn to write a new image in OpenCV using Python by creating an image, reading with imread, displaying with imshow, and saving with imwrite.
Learn basic operations in OpenCV with Python, including importing cv2, reading color and grayscale images, displaying them, and saving results with keyboard controls.
Learn to read videos in Python with OpenCV, using video capture for webcam and file inputs, reading frames with cap.read, and displaying them with cv2.imshow.
Learn to convert color videos to grayscale using OpenCV by capturing frames from a webcam, applying cvtColor with BGR2GRAY, and displaying the grayscale video.
Explore video capture properties in Python OpenCV by checking cap.isOpened, selecting a camera index, displaying frames with imshow, and retrieving video width and height via cap.get, then releasing resources.
Learn how to save a captured video in OpenCV by streaming from a webcam, creating a video writer, and saving to output avi.
Detect faces with haarcascade classifiers in OpenCV using the cascade frontal face default xml file. Convert images to grayscale, apply multi-scale detection, and draw rectangles around faces.
Learn to detect multiple faces in video using a cascade classifier with OpenCV, convert frames to grayscale, draw bounding rectangles, and process video files or webcams.
Learn to detect eyes with a Haar cascade classifier in OpenCV by loading the eye classifier, converting images to grayscale, applying detectMultiScale, and drawing bounding boxes.
Learn to detect eyes in video using a haarcascade classifier with OpenCV, processing frames in grayscale and drawing rectangles around detected eyeballs.
Students implement face and eye detection in Python using OpenCV's cascade classifiers, converting images to grayscale, detecting features, and drawing colored rectangles to display results.
Learn to implement face and eye detection in a video using OpenCV with cascade classifiers, capture and process frames, and draw detection rectangles.
learn to draw geometric shapes in OpenCV, including lines, rectangles, and circles, using coordinates, colors, and thickness on the Lenna image.
Learn to draw and fill rectangles on images with OpenCV, using the rectangle function, set start and end coordinates, choose color and thickness, and experiment with fill option.
Learn how to add text to an image with OpenCV using Python, including font selection, size, color, thickness, line type, and placing text at specific coordinates.
Configure camera resolution in OpenCV with Python by using VideoCapture.set to adjust width and height (property 3 and 4) within 640 by 480 to 1280 by 720.
Learn how to overlay video text with real-time width, height, and current date and time using OpenCV, cv2, capture video, and display with putText.
Learn to create a black image with numpy.zeros by defining shape, data type, and optional order, then display it with OpenCV's imshow and clean up with destroyAllWindows.
Learn to handle mouse click events in OpenCV with Python, capture left button coordinates, print on console and display x, y coordinates on the image using setMouseCallback.
Detects BGR color channels of an image via mouse clicks in OpenCV, displaying blue, green, and red values at clicked coordinates and illustrating BGR versus RGB in real time.
Learn to draw interactive circles on a NumPy-based image and connect successive points with lines using OpenCV in Python, via a mouse callback that records clicks.
Show image color in a new window by clicking on a Python OpenCV image, and display the corresponding BGR color in a separate window.
Learn to duplicate a region of an image and position it inside another area using OpenCV with coordinates, rectangles, and image copying steps.
Blend two images in OpenCV using add and addWeighted, adjusting alpha and beta for brightness. Resize inputs to the same size to avoid errors.
Explore bitwise operations in OpenCV, including and, or, xor, and not, using black-and-white images to illustrate outputs and demonstrate numpy and cv2 workflows.
Create a BGR color selector in OpenCV with a trackbar using Python. Adjust blue, green, and red values to mix colors and view results in the window.
Create and control a trackbar on an image to toggle between color and gray, display the current trackbar position, and annotate the image with the position text.
Learn to detect colors in OpenCV by converting BGR to HSV, thresholding color ranges, and masking with bitwise operations to isolate blue, green, and red objects.
Learn to track HSV values in Python with OpenCV by building a color tracker that thresholds blue, green, and red using lower and upper HSV bounds, masking, and live trackbars.
Learn how to detect colors in a video by initializing a video capture object, reading frames, and applying color tracking with OpenCV, whether from webcam or a video file.
Explore image thresholding as a simple, effective method to partition grayscale images into foreground and background via binarization with OpenCV.
Explore adaptive thresholding in OpenCV, comparing mean and Gaussian methods to binarize grayscale images, and observe how region-based thresholds shape the resulting binary images.
Explore how to use matplotlib with OpenCV to display images, convert BGR to RGB, and plot coordinates and color data with plt.show and cv2.
Open multiple images with matplotlib using OpenCV, apply binary and adaptive thresholding on a gradient image, and display results in a configurable 2x3 (or 3x2) grid with titles.
Explore morphological transformation in OpenCV, including erosion and dilation with a structural element, and learn to apply opening and closing to binary images.
Explore dilation, a morphological transformation that enlarges white regions by applying a kernel over a binary image, joining broken parts and removing noise, with OpenCV dilate.
Explore erosion and dilation, two core morphological transformations in OpenCV with Python, including how kernels and binary inverse thresholding affect the foreground and its boundaries.
Explore opening morphological transformation in OpenCV, a noise-removal technique created by erosion followed by dilation, demonstrated with kernels and iterations in Python.
Explore closing morphological transformation with OpenCV, applying dilation followed by erosion to close small holes, using a 2x2 kernel and 10 iterations, and visualize results.
Explore morphological transformations in OpenCV with Python, including dilation and erosion, the gradient, top hat, and black hat, and the opening difference concept to highlight features.
Explore 2D convolutions in OpenCV by applying kernels, a low-pass filter, and color-space adjustments to enhance images for tasks like edge detection, sharpening, and noise reduction in convolutional neural networks.
Explore image filtration in OpenCV, including 2D convolution and filters such as blur, Gaussian blur, median blur, and bilateral filter, along with their noise reduction and edge preservation effects.
Apply Laplacian gradient filtering in OpenCV to compute the Laplacian of a grayscale image using the Sobel derivatives, then visualize the original and Laplacian outputs.
Explore Sobel gradient in OpenCV to detect edges in x, y, and combined results, using an extended Sobel operator and Python.
Learn how to apply canny edge detection in OpenCV to detect edges while suppressing noise, using a multi-stage process with adjustable thresholds.
Learn how to create gaussian pyramids in OpenCV, downsampling and upsampling images to multiple resolutions, forming a pyramid of images for efficient object and face detection.
Learn to create multiple image pyramids in Python using OpenCV, applying gaussian pyramid techniques with for loops and sampling to generate lower resolutions, and preview laplacian pyramid.
Explore laplacian pyramids derived from gaussian pyramids in Python with OpenCV, illustrating edge detection and image compression through level differences and expanded upper levels.
Learn to blend images in OpenCV by stacking two images vertically or horizontally, resizing them, and displaying the blended output using NumPy and cv2.
Draw contours in OpenCV by applying thresholding and Canny edge detection. Convert images to binary, then find and draw contours on the original image.
Explore motion detection in OpenCV by capturing two frames, converting to gray, applying gaussian blur, thresholding, dilating, finding and drawing contours on the original frame to show moving objects.
This lecture teaches motion tracking in Python using OpenCV, drawing a moving object's rectangle, implementing the difference between two frames, Gaussian blur, thresholding, dilation, and contour tracking.
Learn to detect simple geometric shapes in OpenCV by converting to gray, thresholding, and contour approximation to identify circles, rectangles, triangles, pentagons, squares, and stars.
Annotate detected shapes in images by naming triangles, squares, rectangles, pentagons, and stars using OpenCV. Learn to compute contour coordinates, use bounding boxes and text overlays to display shape names.
Learn to perform template matching in OpenCV with Python to locate template regions—like seven, ball, hand, head—in an image, draw bounding rectangles, and handle multiple detections.
Unlock the power of computer vision with our comprehensive course and also get a FREE comprehensive eBook that will accompany you along in this course, “Python Face Detection & Image Processing in Computer Vision with a FREE Coding Book”. Designed for beginners, this course will guide you through the fascinating world of computer vision, equipping you with the skills to create your own image and video processing applications.
What You’ll Learn:
Introduction to Computer Vision: Understand the basics and significance of computer vision in today’s technology-driven world.
PyCharm, NumPy, and OpenCV Setup for Beginners: Step-by-step instructions to set up your development environment and essential libraries.
Working with NumPy in Computer Vision: Learn how to manipulate and process images using NumPy arrays.
How to Read an Image in OpenCV: Master the techniques to load and display images using OpenCV.
How to Read a Video in OpenCV: Discover how to capture and process video streams.
Face Detection Using Haar Cascade Classifier: Implement face detection algorithms to identify faces in images.
Eye Detection Using Haar Cascade Classifier: Extend your skills to detect eyes within detected faces.
Face Detection in a Video: Apply face detection techniques to real-time video streams.
Eye Detection in a Video: Enhance your video processing skills by detecting eyes in video streams.
How to Handle Mouse Click Events in OpenCV: Learn to interact with images using mouse events.
Image Thresholding in Computer Vision: Explore various thresholding techniques to segment images.
Working with Matplotlib in Computer Vision: Visualize your image processing results using Matplotlib.
Morphological Transformations in Computer Vision: Perform advanced image processing tasks like erosion, dilation, opening, and closing.
Image Filtration Processes in Computer Vision: Implement filters to enhance or detect features in images.
Image Pyramids in Computer Vision: Understand and apply image pyramids for multi-scale image processing.
Contours in Computer Vision: Detect and analyze contours in images for shape analysis.
Geometric Shapes Analysis in Computer Vision: Analyze and manipulate geometric shapes within images.
Why Enroll in This Course?
Hands-On Learning: Engage in practical exercises and projects to solidify your understanding.
Expert Guidance: Learn from experienced instructors who are passionate about computer vision.
Comprehensive Curriculum: Cover all essential topics from basic setup to advanced image processing techniques.
Real-World Applications: Gain skills that are directly applicable to real-world projects and job roles.
Community Support: Join a community of learners and professionals to share knowledge and collaborate on projects.
Who Should Enroll?
Beginners: No prior experience in computer vision or Python is required.
Aspiring Developers: Ideal for those looking to start a career in computer vision and image processing.
Tech Enthusiasts: Perfect for anyone interested in exploring the capabilities of computer vision.
Enroll Now!
Take the first step towards mastering computer vision with Python and OpenCV. Enroll in “Computer Vision In Python | Face Detection & Image Processing using OpenCV” today and transform your passion for technology into practical skills!
Computer vision is an interdisciplinary field that deals with how computers can be made to gain high-level understanding from digital images or videos. From the perspective of engineering, it seeks to automate tasks that the human visual system can do. Computer vision is concerned with the automatic extraction, analysis and understanding of useful information from a single image or a sequence of images. It involves the development of a theoretical and algorithmic basis to achieve automatic visual understanding. As a scientific discipline, computer vision is concerned with the theory behind artificial systems that extract information from images. The image data can take many forms, such as video sequences, views from multiple cameras, or multi-dimensional data from a medical scanner. As a technological discipline, computer vision seeks to apply its theories and models for the construction of computer vision systems.
Distinctions
The fields most closely related to computer vision are image processing, image analysis and machine vision. There is a significant overlap in the range of techniques and applications that these cover. This implies that the basic techniques that are used and developed in these fields are similar, something which can be interpreted as there is only one field with different names. On the other hand, it appears to be necessary for research groups, scientific journals, conferences and companies to present or market themselves as belonging specifically to one of these fields and, hence, various characterizations which distinguish each of the fields from the others have been presented.
Computer graphics produces image data from 3D models, computer vision often produces 3D models from image data. There is also a trend towards a combination of the two disciplines, e.g., as explored in augmented reality.
The following characterizations appear relevant but should not be taken as universally accepted:
Image processing and image analysis tend to focus on 2D images, how to transform one image to another, e.g., by pixel-wise operations such as contrast enhancement, local operations such as edge extraction or noise removal, or geometrical transformations such as rotating the image. This characterization implies that image processing/analysis neither require assumptions nor produce interpretations about the image content.
Computer vision includes 3D analysis from 2D images. This analyzes the 3D scene projected onto one or several images, e.g., how to reconstruct structure or other information about the 3D scene from one or several images. Computer vision often relies on more or less complex assumptions about the scene depicted in an image.
Machine vision is the process of applying a range of technologies & methods to provide imaging-based automatic inspection, process control and robot guidance in industrial applications. Machine vision tends to focus on applications, mainly in manufacturing, e.g., vision-based robots and systems for vision-based inspection, measurement, or picking (such as bin picking). This implies that image sensor technologies and control theory often are integrated with the processing of image data to control a robot and that real-time processing is emphasized by means of efficient implementations in hardware and software. It also implies that the external conditions such as lighting can be and are often more controlled in machine vision than they are in general computer vision, which can enable the use of different algorithms.
There is also a field called imaging which primarily focuses on the process of producing images, but sometimes also deals with processing and analysis of images. For example, medical imaging includes substantial work on the analysis of image data in medical applications.
Finally, pattern recognition is a field which uses various methods to extract information from signals in general, mainly based on statistical approaches and artificial neural networks. A significant part of this field is devoted to applying these methods to image data.
Applications
Applications range from tasks such as industrial machine vision systems which, say, inspect bottles speeding by on a production line, to research into artificial intelligence and computers or robots that can comprehend the world around them. The computer vision and machine vision fields have significant overlap. Computer vision covers the core technology of automated image analysis which is used in many fields. Machine vision usually refers to a process of combining automated image analysis with other methods and technologies to provide automated inspection and robot guidance in industrial applications. In many computer-vision applications, the computers are pre-programmed to solve a particular task, but methods based on learning are now becoming increasingly common. Examples of applications of computer vision include systems for:
Automatic inspection, e.g., in manufacturing applications;
Assisting humans in identification tasks, e.g., a species identification system
Controlling processes, e.g., an industrial robot;
Detecting events, e.g., for visual surveillance or people counting, e.g., in the restaurant industry;
Interaction, e.g., as the input to a device for computer-human interaction;
Modeling objects or environments, e.g., medical image analysis or topographical modeling;
Navigation, e.g., by an autonomous vehicle or mobile robot; and
Organizing information, e.g., for indexing databases of images and image sequences.
Medicine
One of the most prominent application fields is medical computer vision, or medical image processing, characterized by the extraction of information from image data to diagnose a patient. An example of this is detection of tumors, arteriosclerosis or other malign changes; measurements of organ dimensions, blood flow, etc. are another example. It also supports medical research by providing new information: e.g., about the structure of the brain, or about the quality of medical treatments. Applications of computer vision in the medical area also includes enhancement of images interpreted by humans—ultrasonic images or X-ray images for example—to reduce the influence of noise.
Machine Vision
A second application area in computer vision is in industry, sometimes called machine vision, where information is extracted for the purpose of supporting a manufacturing process. One example is quality control where details or final products are being automatically inspected in order to find defects. Another example is measurement of position and orientation of details to be picked up by a robot arm. Machine vision is also heavily used in agricultural process to remove undesirable food stuff from bulk material, a process called optical sorting.
Military
Military applications are probably one of the largest areas for computer vision. The obvious examples are detection of enemy soldiers or vehicles and missile guidance. More advanced systems for missile guidance send the missile to an area rather than a specific target, and target selection is made when the missile reaches the area based on locally acquired image data. Modern military concepts, such as "battlefield awareness", imply that various sensors, including image sensors, provide a rich set of information about a combat scene which can be used to support strategic decisions. In this case, automatic processing of the data is used to reduce complexity and to fuse information from multiple sensors to increase reliability.
Autonomous vehicles
One of the newer application areas is autonomous vehicles, which include submersibles, land-based vehicles (small robots with wheels, cars or trucks), aerial vehicles, and unmanned aerial vehicles (UAV). The level of autonomy ranges from fully autonomous (unmanned) vehicles to vehicles where computer-vision-based systems support a driver or a pilot in various situations. Fully autonomous vehicles typically use computer vision for navigation, e.g. for knowing where it is, or for producing a map of its environment (SLAM) and for detecting obstacles. It can also be used for detecting certain task specific events, e.g., a UAV looking for forest fires. Examples of supporting systems are obstacle warning systems in cars, and systems for autonomous landing of aircraft. Several car manufacturers have demonstrated systems for autonomous driving of cars, but this technology has still not reached a level where it can be put on the market. There are ample examples of military autonomous vehicles ranging from advanced missiles to UAVs for recon missions or missile guidance. Space exploration is already being made with autonomous vehicles using computer vision, e.g., NASA's Curiosity and CNSA's Yutu-2 rover.
Tactile Feedback
Materials such as rubber and silicon are being used to create sensors that allow for applications such as detecting micro undulations and calibrating robotic hands. Rubber can be used in order to create a mold that can be placed over a finger, inside of this mold would be multiple strain gauges. The finger mold and sensors could then be placed on top of a small sheet of rubber containing an array of rubber pins. A user can then wear the finger mold and trace a surface. A computer can then read the data from the strain gauges and measure if one or more of the pins is being pushed upward. If a pin is being pushed upward then the computer can recognize this as an imperfection in the surface. This sort of technology is useful in order to receive accurate data of the imperfections on a very large surface. Another variation of this finger mold sensor are sensors that contain a camera suspended in silicon. The silicon forms a dome around the outside of the camera and embedded in the silicon are point markers that are equally spaced. These cameras can then be placed on devices such as robotic hands in order to allow the computer to receive highly accurate tactile data.
Other application areas include:
Support of visual effects creation for cinema and broadcast, e.g., camera tracking (matchmoving).
Surveillance.
Driver drowsiness detection
Tracking and counting organisms in the biological sciences
[Reference: Wikipedia]