optflow | Python bindings to optical flow algorithms | Computer Vision library
kandi X-RAY | optflow Summary
kandi X-RAY | optflow Summary
Python bindings to optical flow algorithms.
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Top functions reviewed by kandi - BETA
- Call build extensions
- Override the cuda compiler
- Locate the CUDA home directory
- Generate a color code for the given flow
optflow Key Features
optflow Examples and Code Snippets
Community Discussions
Trending Discussions on optflow
QUESTION
I try to build the OpenCV 4.5.1 SDK for Android because I need the SDK with contrib modules and the official release [1] only has the standard modules. But the libraries I build are almost 10x larger, for example: libopencv_core.a ==> 47.6 MB self compiled, 5.3 MB from the official repository (both for arm64-v8a)
Here is my cmake command, followed by ninja for compilation.
...ANSWER
Answered 2021-Mar-23 at 12:28I found the culprit:
QUESTION
I am trying to compile OpenCV for Android with contrib modules, mainly I am interested in sfm. I did a lot of research and finaly I did the following in order to support sfm:
Compiled gflags Compiled Glog Compiled Ceres
After that I used this cmake command to build and generate (partial output is given below):
...ANSWER
Answered 2021-Jan-24 at 21:16I just finished build opencv with android using this :
for ceres
QUESTION
OpenCV 4.5 - Ubuntu - Jetson Nano 2GB
Hello I have a problem with getting video from my webcam (connected by USB to JetsonNano) by OpenCV
Here's my code:
...ANSWER
Answered 2020-Nov-27 at 06:41For points 1 and 2, you can test by passing the second argument to VideoCapture(filename[, apiPreference]). Since you have OpenCV built with ffmpeg and v4l2. I would try the following options cv::CAP_FFMPEG, and CAP_V4L2. For point 4, make sure your webcam is 1080p.
QUESTION
I am trying to install latest OpenCV from here: https://github.com/opencv/opencv on my Ubuntu 20.04.
I need python and java support. I have installed a lot of per-requisites and used this cmake command to configure the build using the command line:
...ANSWER
Answered 2020-Jul-07 at 07:35Meanwhile I found the reason. The problem was this option: -DBUILD_opencv_world=ON When I removed it:
QUESTION
I wrote this code
...ANSWER
Answered 2020-Apr-06 at 08:54%matplotlib inline
%pylab
from scipy.ndimage import gaussian_filter
import matplotlib.pyplot as plt
import matplotlib.colors as mcolors
U = gaussian_filter(optflow[1][:,:,0], sigma = 10)
V = gaussian_filter(optflow[1][:,:,1], sigma = 10)
U[abs(U) < 0.5] = 0
V[abs(V) < 0.5] = 0
M = np.sqrt(U*U+V*V)
# cmap = plt.cm.get_cmap("inferno", 7).colors
# colors = list((mcolors.to_hex(x) for x in cmap))
plt.quiver(U[::7, ::7], V[::7, ::7], C=M, cmap='inferno', scale=0.4, scale_units = 'xy', headlength = 7)
#plt.axis('off')
plt.gca().invert_yaxis()
plt.savefig('/home/roberto/workspace/TEST/OUTPUT/CORRECTIONCLEAN/TEST0.png')
matplotlib.pyplot.clf()
QUESTION
I'm trying to compile openCV but it doesn't seem to work somehow.
Is this a problem with cuda?
I am running this in a docker-container (nvidia-docker)
Hardware is a Jetson Nano with newest JetPack - Version
What could that problem be?
...ANSWER
Answered 2020-Feb-26 at 20:00The solution was to use the nvidia-libraries.
So i took the lib-files from the JetPack download-folder
and used them
-worked!
QUESTION
I'm trying to install opencv 4.1 to use in python WITH Cuda support. I tried following this guide and had preinstalled CUDA 10 (because I needed it with keras and this works already), but when checking opencv in python using following code
...ANSWER
Answered 2019-Sep-22 at 17:09The problem was after I compiled opencv with the flags I wanted, I forgot to run sudo make install to effectively install all the bindings etc.
By default python finds the cv2 module, but not everything is configured.
QUESTION
I'm currently writing a conanfile.py to build OpenCV, a custom build used internally by my company. We're trying to use CMake to build but we're coming across an unexpected behaviour by OpenCV: when generating a Release build without specifying the build_type in settings, OpenCV generates a release and a debug build.
This is our conanfile.py:
...ANSWER
Answered 2019-Aug-02 at 13:31Running the install target would trigger the second build as it didn't have the same build type as the build command. The solution is to, if using the CMake helper, pass build_type="Release" as a parameter of the constructor or, if running CMake from the command line helper, pass "--config Release".
QUESTION
I downloaded GCC and opencv(3.4.1_2) in my Mac OS X high Sierra(10.13.3) through homebrew.
...ANSWER
Answered 2018-Apr-16 at 12:37As I suggested in the comments, this is likely to work if you use the clang++ compiler in place of GNU g++, which is why I suggested you run:
QUESTION
i have a problem with my makefile. It will not set the opencv include directory.
Makefile:
...ANSWER
Answered 2019-Jul-11 at 10:14I think the problem is with the way make processes the target $(OBJ_CF). That expands to...
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No vulnerabilities reported
Install optflow
You can use optflow like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.
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