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Welcome to B4X forum!
B4X is a set of simple and powerful cross platform RAD tools:
- B4A (free) - Android development
- B4J (free) - Desktop and Server development
- B4i - iOS development
- B4R (free) - Arduino, ESP8266 and ESP32 development
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B4A Library OpenCV 3.x - JordiCP Jun 27, 2025 (71 reactions) OpenCV (Open Source Computer Vision Library) is a really huge project/framework actively developed.../
OpenCV versions: https://opencv.org/releases/
OpenCV library for B4A: wraps the official OpenCV 3... B4A Code Snippet OpenCV warp perspective - jkhazraji Jun 6, 2025 (8 reactions) As I 've been searching for OpenCV in the web, I found an interesting tutorial (in Python) about the things OpenCV can do. One of them is warp perspective It took only 10 lines in Python to display the effect but in b4a OpenCV approach the logic is different. import cv2 import numpy as np img=cv2.imread("Resources/cards.png") width, height = 250,350 pts1=np.float32(,,,]) pts2=np.float32(,,,]) matrix=cv2.getPerspectiveTransform(pts1, pts2) imgOutput=cv2.warpPerspective(img, matrix... B4J Code Snippet Detect faces with OpenCV (JavaObject) - Douglas Farias May 8, 2024 (15 reactions) Oo4aquax0LM
Hello everyone, I made a basic example of how to use OpenCV with javaobject and... .xml.
https://github.com/opencv/opencv/tree/master/data/haarcascades
I am using in this example... B4J Code Snippet OpenCV Image to JPEG byte array with resize/quality options - OliverA Oct 29, 2022 (9 reactions) -options.91774/
A new OpenCV version that is heavily based on the first version (published here... convert it to a byte array is now using OpenCV classes/methods.
This version, unlike the previous... B4J Question Threading library for OpenCV - peacemaker Nov 9, 2021 HI, All
I know that the threading lib is not recommended at all.
But it's very important for OpenCV work with IP-cameras, that can give big frames latency, and the main window is frozen while... B4A Example OpenCV real time car detection examples, by @moster67 (and friends) - JordiCP Jun 13, 2017 (15 reactions) of things ( :D ) , but the example is very good for learning as it makes use of several OpenCV classes... commented. A bit of explanation of cascade classifiers http://docs.opencv.org/3.2.0/dc/d88... FILE USING OPENCV FOR B4A ** '** VIDEO MUST BE IN MJPEG AND WITHIN AN AVI CONTAINER (VIDEO INCLUDED) ** '** OPENCV WRAPPER BY @JordicCP, SAMPLE CODE BY @Moster67 ** Sub Process_Globals...) mVideo.Initialize(File.DirInternal & "/cars3.avi",mVio.CAP_ANY) Log(mVideo.isOpened... B4A Example OpenCV and Tensorflow methods for chessboard and chessfigures detection/classification - gezueb Dec 26, 2024 (21 reactions) Two apps show methods and their usage to recognize chess figures and their position based on a camera shot, one using only OpenCV image processing and utils (Chessboard OCV) and the second one using Tensorflow Lite (Chessboard AI) to classify the figures. A standard FEN string is then created for further processing by chess engines like Droidfish. Please refer to the description attached for more... B4A Question virus in opencv3 - Theera Jan 4, 2024 refer to this. I've tested the example car detection . My mobile warns about virus attached app... B4A Example Inline JavaCV/OpenCV - DrewG Nov 13, 2015 (8 reactions) open(String filename) { IplImage image = cvLoadImage(filename); if (image != null...); cvMorphologyEx(image, image, null, mat, MORPH_OPEN, 1); cvSaveImage(filename, image...I have had some luck using JavaCV inline, here is how to do it: Download this: http://search.maven... "videoinput" "libfreenect" "flycapture" "ffmpeg" "opencv..." "opencv-android-arm" Enable JavaObject Lib Add this to your code: #AdditionalJar... B4i Question OpenCV - ykucuk Jul 18, 2022 Hi,
is there any library for use OpenCV methods in B4i.
I need OCR by given image. I will change image with OpenCV for better OCR result
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