Tag: opencv

The back-end

Python Image Processing OpenCV (13) : Scharr operator and LOG operator edge detection techniques

January 3, 2024

by Kaitlin Gutierrez

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Before talking about Scharr operator, it is necessary to mention the Sobel operator we introduced before. Although Sobel operator can effectively extract image edges, it...

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android

Android uses OpenCV 4.3.0

January 3, 2024

by William Turner

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The entire project is copied from the official project, but I did this to make it easier to use and reduce compilation errors due to...

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The back-end

An understanding of Cv2. WaitKey is sufficient

January 3, 2024

by 袁俊傑

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When I first used OpencV to process images, I probably looked up the cv2.waitKey function. At that time, I was in a bit of a...

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Artificial intelligence (ai)

Can you run AI face recognition without being familiar with Python? Hidden Boss is it!

January 3, 2024

by 黃怡安

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1, buy a small "computer" since you want to do face recognition, it has to find a small computer with a camera. First of all,...

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android

Android OpenCV (15) : image convolution

January 3, 2024

by Arnav Chanda

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Parameter one: SRC, enter the image. Parameter two: DST, the output image, with the same size and number of channels as the input image. Parameter...

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android

Android OpenCV (3) : image pixel value statistics

January 2, 2024

by Kathryn Collins

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The standard deviation, also known as the mean square error, is the square root of the arithmetic mean of the square of the mean deviation,...

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android

Android OpenCV (13) : Image pyramid

January 2, 2024

by Rhea Sachar

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Parameter 1: SRC, input the image to be sampled. Parameter 3: DSTSIZE, output image size, can default. Parameter 1: SRC, input the image to be...

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Artificial intelligence (ai)

Get media streams from your local camera

January 2, 2024

by Michele Brock

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OpenCVSharp introductory tutorial foundation ③ -- from the local camera to get media stream one, interface layout, two, function implementation, three, abnormal error, four, run,...

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android

Android OpenCV (23) : Sobel operator edge detection

January 2, 2024

by William Mendoza

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Parameter one: SRC, enter the image. Parameter two: DST, the output image, with the same size and number of channels as the input image. Parameter...

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Artificial intelligence (ai)

From Basics to Practice OpenCV (1) – Read, display, and write images

January 2, 2024

by Mrs. Gemma Holt

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Introduces what is computer vision, OpenCV provides us with what convenience to process pictures and its main applications, and finally introduces the image representation, and...

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Artificial intelligence (ai)

OpenCV (23) — Image pyramid

January 2, 2024

by Charles Ellis

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What is an image pyramid An image pyramid is a collection of images made up of multiple sub-images of an image at different resolutions. The...

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android

Android OpenCV (a) : picture reading and writing

January 2, 2024

by Lauren Mendoza

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Mat is a memory object used to store image information in OpenCV. The Mat object stores pixel information of the picture, as well as attributes...

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Artificial intelligence (ai)

OpenCV (4) — Bitplane decomposition and synthesis

January 1, 2024

by Kenneth Smith

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What is bitplane decomposition? A binary image is obtained by combining the binary pixel values in the uniform bit in the gray image, which is...

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android

Android OpenCV (10) : image perspective transformation

January 1, 2024

by Saanvi Hari

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There are eight unknowns in the equation system of perspective transformation, so the solution needs to find four groups of mapping points, and four points...

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Artificial intelligence (ai)

From Basics to Practice OpenCV (2) – Read video streams

January 1, 2024

by Jhanvi Loke

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Last time I introduced how to read pictures and write image data into pictures, today I shared how to read and write video streams through...

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Artificial intelligence (ai)

OpenCV (6) — Digital watermark embedding and extraction

January 1, 2024

by Michael Hart

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In a previous post on bitplane decomposition, we mentioned that you can use bitplane decomposition to add watermarks to images. Numerical watermarking is the most...

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android

Android OpenCV (26) : Canny algorithm edge detection

January 1, 2024

by Arnav Dube

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The edge detection based on Canny algorithm mainly consists of five steps, including Gaussian filtering, pixel gradient calculation, non-maximum pixel gradient suppression, lag threshold processing...

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android

Android OpenCV (14) : image histogram

January 1, 2024

by 蘇佳玲

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Parameter 1: images, an array of images of the histogram to be counted. All images in the array should have the same size and data...

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Artificial intelligence (ai)

Python gets the coordinates and similarity of the small graph in the large graph

January 1, 2024

by Biju Acharya

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CV find_template is used to complete the test of searching for small images in large images as follows: The results of searching for the original...

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android

Android OpenCV (7) : multi-channel separation and merger

January 1, 2024

by Tiffany Blake

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Multi-channel separation API parameter 1: m, multi-channel image to be separated parameter 2: MV, separated single-channel image operation channel merge API parameter 1: MV, image...

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Artificial intelligence (ai)

Go beyond Python, Java can also do image processing and face recognition

January 1, 2024

by Richard Mcclain

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What is Javacv? What can the JavacV technology stack do? I'm sure you're interested in JavacV, and I happen to know a little about javacV,...

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The back-end

Python3-opencv implements video file reading and display

December 31, 2023

by Annette Webster-Moss

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OpenCV is a C++ library, currently popular computer vision programming library, used for real-time processing of computer vision problems, it covers a lot of modules...

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android

Autojs is your melon ripe? – Picture to character

December 31, 2023

by Samantha Cragg

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Opencv reads the video, extracts the picture frame, grays the picture, grays the value and the specified character list to do the mapping, and then...

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android

Android OpenCV (34) : straight line fitting

December 30, 2023

by Billy Mason

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How do you fit a line? In general, we use the 'least square method' to ensure that the distance between all data points and the...

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android

Android OpenCV (16) : Salt and pepper noise

December 30, 2023

by 解琬婷

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So far, OpenCV 4 does not provide a function specifically for adding salt and pepper noise to the image. But it can be manually generated...

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The back-end

Python3-opencv implements image smile detection

December 30, 2023

by Kara Fuentes

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OpenCV is a C++ library, currently popular computer vision programming library, used for real-time processing of computer vision problems, it covers a lot of modules...

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android

Android OpenCV (35) : Contour discovery and drawing

December 29, 2023

by Michelle Love

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Generally we use the findContours () function to find the contours in the image. In some cases, certain shapes are inside other shapes, like nested...

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android

Android OpenCV (44) : Image Segmentation (Mean Shift)

December 29, 2023

by Maia Stone

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Image segmentation image segmentation is the technology and process of dividing an image into several specific and unique regions and proposing objects of interest. It...

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The back-end

Python3-opencv Cascade classifier with dynamic face, eye, smile recognition

December 29, 2023

by Edward Oliver

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OpenCV is a C++ library, currently popular computer vision programming library, used for real-time processing of computer vision problems, it covers a lot of modules...

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Artificial intelligence (ai)

OpenCV (9) –HSV marks skin color and achieves artistic effect

December 29, 2023

by Albert Hardy

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Previously, we extracted the effective area of red on the image by marking the red on channel H. Similarly, we can limit the range of...

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