Recent questions tagged OpenCV

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opencv - Android camera2 output to ImageReader format YUV_420_888 still slow

I'm trying to get the Android camera2 running in the background service, then ... captureRequestBuilder.set(CaptureRequest.CONTROL_AF_TRIGGER, // CaptureRequest.CONTROL_AF_TRIGGER...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

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opencv - Finding the size in bytes of cv::Mat

I'm using OpenCV with cv::Mat objects, and I need to know the number of bytes that my matrix occupies in order to ... a cv::Mat size in bytes? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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851 views

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opencv - Error using cv2.findContours(), with python

I've recently started learning OpenCV on Python. I'm referring to this tutorial here, to get some help on ... this issue will be appreciated. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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452 views

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opencv - Generating good training data for haar cascades

I am trying to build haar cascades for doing OCR of a specific font; one classifier per character. I can ... down for efficiency anyway? Thanks! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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656 views

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opencv - How to use Android Camera in Background?

I'm currently developing an app which need to record video in background and process it. (It needs to get ... you for answering the question. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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664 views

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opencv - Otsu thresholding for depth image

I am trying to substract background from depth images acquired with kinect. When I learned what otsu thresholding is I ... ); cv::waitKey(1); See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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780 views

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opencv - How to resize window in opencv2 python

I am using opencv 2 with a webcam. I can get the video stream and process it, but I can't seem to figure out ... images so that I can see them? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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711 views

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opencv - What does the python interface to opencv2.fillPoly want as input?

I'm trying to draw a polygon using the python interface to opencv, cv2. I've created an empty image, ... that error turned up nothing useful. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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565 views

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opencv - UnsatisfiedLinkError: n_Mat while using opencv2.4.3 with android 4.0

i am using opencv in android. but when i am adding Mat() in my code my application unexpectedly stops after ... help. thanks in advance :) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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opencv - UnsatisfiedLinkError: n_Mat while using opencv2.4.3 with android 4.0

i am using opencv in android. but when i am adding Mat() in my code my application unexpectedly stops after ... help. thanks in advance :) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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770 views

1 answer

opencv - how to save Mat image in filestorage

I want to save a floating point one-channel image and I don't want to convert it. So I decided to use filestorage ... ); Mat img; fs >> img; See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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682 views

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opencv - Cannot import cv2 in python in OSX

I have installed OpenCV 3.1 in my Mac, cv2 is also installed through pip install cv2. vinllen@ $ pip install ... list online, but cannot work. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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966 views

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opencv - Fit Quadrilateral (Tetragon) to a blob

After applying different filtering and segmentation techniques, I end up with an image like this: I have access to ... solving such a problem? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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812 views

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opencv - EmguCV - nvcuda.dll could not be found

I've been asked to build a real-time face recognition application, and after some looking around I've decided ... that helps. Any suggestions? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.3k views

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opencv - how to superimpose heatmap on a base image?

Please look at this github page. I want to generate heat maps in this way using Python PIL,open cv or matplotlib ... image shape is (800,800,3) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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712 views

1 answer

opencv - Convert a folder comprising jpeg images to hdf5

Is there a way to convert a folder comprising .jpeg images to hdf5 in Python? I am trying to build a ... for classification of images. Thanks! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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862 views

1 answer

opencv c++: converting image matrix from unsigned char to float

I have a problem with converting an image matrix. I use: Mat image = imread(image_name, 0); to read an image ... char. What am I doing wrong? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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785 views

1 answer

opencv - Image Sharpening Using Laplacian Filter

I was trying to sharpening on some standard image from Gonzalez books. Below are some code that I ... Result Desired Result Absolute Laplace See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.4k views

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opencv - Python unsharp mask

I want to use unsharp mask on a 16 Bit Image. The Image has 640 x 480 Pixels and is saved in a ... UnsharpImage = Image + (WightFaktor*Mask1) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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571 views

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opencv - "The program can't start because opencv_world300.dll is missing from your computer" error in C++

I want to compile an opencv Console C++ program in Visual Studio 2013. This is my code: #include "stdafx.h" ... How can I fix this problem? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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778 views

1 answer

opencv - Camera motion from corresponding images

I'm trying to calculate a new camera position based on the motion of corresponding images. the images ... .8236506374002566, 0.3446041331317597] See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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809 views

1 answer

opencv - open cv ios video processing

I'm trying to do the tutorial found here for ios video processing with openCv framework. I've successfully loaded ... . I will try and update See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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422 views

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opencv - Android: Recording and Streaming at the same time

This is not really a question as much as it is a presentation of all my attempts to solve one of the most ... copy the bytes or intercept it. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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648 views

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opencv - Finger/Hand Gesture Recognition using Kinect

Let me explain my need before I explain the problem. I am looking forward for a hand controlled application. ... accepted as a good suggestion. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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574 views

1 answer

opencv - rotated face detection

Is there a library for detecting faces that have been rotated in the image plane? Or is there some way in ... detection with opencv to do it? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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764 views

1 answer

opencv - Need Haar Casscades for Nose, Eyes & Lips(Mouth)

I need Haar Cascades xml files for Mouth, Eyes & Nose. Do provide me useful links. Any kind of help would be highly appreciated. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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2.6k views

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opencv - How to apply CLAHE on RGB color images

CLAHE is Contrast Limited Adaptive Histogram Equalization and a source in C can be found at http://tog.acm.org/ ... images)? If yes, how? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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724 views

1 answer

opencv - Coffee beans separation algorithm

What is proper algorithm for separating (counting) coffee beans on binary image? Beans can touch and partially ... (moving people separation). See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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