Problem
I’m using a projector that’s being detected by my laptop that’s running Linux and used as a second monitor to project a pattern onto an object that I want imaged.
I’m wanting to use the moveWindow() function to consistently display the stripe pattern in the same place every time my C++ acquisition program ran.
Steps that I’ve taken
I first ran the C++ program below to see if the window would move around on it’s own, but the OpenCV window was stationary no matter the values I passed into the moveWindow() function.
When I asked my friend to run the same C++ program on his Debian machine he was able to observe the window moving around on it’s own.
For what it’s worth:
- I’m running the 6.5.0-27 kernel
- Have Ubuntu 22.04 installed on my machine
- Using gdm3 as my default display manager
- I also had to build OpenCV from source; both the buildscript and the cmake output can be found below, to have GStreamer support
The C++ test program
#include <stdlib.h> /* srand, rand */
#include <time.h> /* time */
#include <opencv2/opencv.hpp>
#include <opencv2/highgui.hpp>
int main() {
srand (time(NULL));
cv::Mat test = cv::Mat::zeros(400,300,CV_8UC3);
cv::namedWindow("banana");
int key, x, y;
while (true) {
cv::imshow("banana", test);
key = cv::waitKey(500);
if (key == 97) {
break;
} else if (key != 0) {
x = rand() % 1000 + 1;
y = rand() % 1000 + 1;
cv::moveWindow("banana", x, y);
}
}
}
buildScript
#!/bin/bash
sudo apt-get update
sudo apt-get install -y build-essential cmake git libgtk2.0-dev pkg-config \
libavcodec-dev libavformat-dev libswscale-dev \
libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev \
python3-dev python3-numpy
cd ~
git clone https://github.com/opencv/opencv.git
cd opencv
git checkout 4.9.0
mkdir build
cd build
# Configure build with GStreamer support
cmake -D CMAKE_BUILD_TYPE=RELEASE \
-D CMAKE_INSTALL_PREFIX=/usr/local \
-D OPENCV_GENERATE_PKGCONFIG=YES \
-D WITH_GSTREAMER=YES \
-D WITH_GSTREAMER_0_10=OFF \
-D WITH_FFMPEG=YES \
-D WITH_OPENEXR=YES \
-D BUILD_EXAMPLES=NO \
-D BUILD_opencv_python2=NO \
-D BUILD_opencv_python3=YES \
-D PYTHON_DEFAULT_EXECUTABLE=/usr/bin/python3 \
-D OPENCV_PYTHON3_INSTALL_PATH=/usr/local/lib/python3.7/dist-packages \
-D OPENCV_ENABLE_NONFREE=YES \
-D INSTALL_PYTHON_EXAMPLES=NO ..
make -j$(nproc)
sudo make install
sudo ldconfig
Output from Cmake file
--
-- General configuration for OpenCV 4.9.0 =====================================
-- Version control: 4.9.0
--
-- Platform:
-- Timestamp: 2024-04-19T16:22:39Z
-- Host: Linux 6.5.0-27-generic x86_64
-- CMake: 3.22.1
-- CMake generator: Unix Makefiles
-- CMake build tool: /usr/bin/gmake
-- Configuration: RELEASE
--
-- CPU/HW features:
-- Baseline: SSE SSE2 SSE3
-- requested: SSE3
-- Dispatched code generation: SSE4_1 SSE4_2 FP16 AVX AVX2 AVX512_SKX
-- requested: SSE4_1 SSE4_2 AVX FP16 AVX2 AVX512_SKX
-- SSE4_1 (18 files): + SSSE3 SSE4_1
-- SSE4_2 (2 files): + SSSE3 SSE4_1 POPCNT SSE4_2
-- FP16 (1 files): + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 AVX
-- AVX (9 files): + SSSE3 SSE4_1 POPCNT SSE4_2 AVX
-- AVX2 (38 files): + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 FMA3 AVX AVX2
-- AVX512_SKX (8 files): + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 FMA3 AVX AVX2 AVX_512F AVX512_COMMON AVX512_SKX
--
-- C/C++:
-- Built as dynamic libs?: YES
-- C++ standard: 11
-- C++ Compiler: /usr/bin/c++ (ver 11.4.0)
-- C++ flags (Release): -fsigned-char -W -Wall -Wreturn-type -Wnon-virtual-dtor -Waddress -Wsequence-point -Wformat -Wformat-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Wsuggest-override -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -fvisibility-inlines-hidden -O3 -DNDEBUG -DNDEBUG
-- C++ flags (Debug): -fsigned-char -W -Wall -Wreturn-type -Wnon-virtual-dtor -Waddress -Wsequence-point -Wformat -Wformat-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Wsuggest-override -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -fvisibility-inlines-hidden -g -O0 -DDEBUG -D_DEBUG
-- C Compiler: /usr/bin/cc
-- C flags (Release): -fsigned-char -W -Wall -Wreturn-type -Waddress -Wsequence-point -Wformat -Wformat-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -O3 -DNDEBUG -DNDEBUG
-- C flags (Debug): -fsigned-char -W -Wall -Wreturn-type -Waddress -Wsequence-point -Wformat -Wformat-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -g -O0 -DDEBUG -D_DEBUG
-- Linker flags (Release): -Wl,--exclude-libs,libippicv.a -Wl,--exclude-libs,libippiw.a -Wl,--gc-sections -Wl,--as-needed -Wl,--no-undefined
-- Linker flags (Debug): -Wl,--exclude-libs,libippicv.a -Wl,--exclude-libs,libippiw.a -Wl,--gc-sections -Wl,--as-needed -Wl,--no-undefined
-- ccache: NO
-- Precompiled headers: NO
-- Extra dependencies: dl m pthread rt
-- 3rdparty dependencies:
--
-- OpenCV modules:
-- To be built: calib3d core dnn features2d flann gapi highgui imgcodecs imgproc ml objdetect photo python3 stitching ts video videoio
-- Disabled: world
-- Disabled by dependency: -
-- Unavailable: java python2
-- Applications: tests perf_tests apps
-- Documentation: NO
-- Non-free algorithms: YES
--
-- GUI: GTK3
-- GTK+: YES (ver 3.24.33)
-- GThread : YES (ver 2.72.4)
-- GtkGlExt: NO
-- VTK support: NO
--
-- Media I/O:
-- ZLib: /usr/lib/x86_64-linux-gnu/libz.so (ver 1.2.11)
-- JPEG: /usr/lib/x86_64-linux-gnu/libjpeg.so (ver 80)
-- WEBP: build (ver encoder: 0x020f)
-- PNG: /usr/lib/x86_64-linux-gnu/libpng.so (ver 1.6.37)
-- TIFF: /usr/lib/x86_64-linux-gnu/libtiff.so (ver 42 / 4.3.0)
-- JPEG 2000: build (ver 2.5.0)
-- OpenEXR: /usr/lib/x86_64-linux-gnu/libImath-2_5.so /usr/lib/x86_64-linux-gnu/libIlmImf-2_5.so /usr/lib/x86_64-linux-gnu/libIex-2_5.so /usr/lib/x86_64-linux-gnu/libHalf-2_5.so /usr/lib/x86_64-linux-gnu/libIlmThread-2_5.so (ver 2_5)
-- HDR: YES
-- SUNRASTER: YES
-- PXM: YES
-- PFM: YES
--
-- Video I/O:
-- DC1394: YES (2.2.6)
-- FFMPEG: YES
-- avcodec: YES (58.134.100)
-- avformat: YES (58.76.100)
-- avutil: YES (56.70.100)
-- swscale: YES (5.9.100)
-- avresample: NO
-- GStreamer: YES (1.20.3)
-- v4l/v4l2: YES (linux/videodev2.h)
--
-- Parallel framework: pthreads
--
-- Trace: YES (with Intel ITT)
--
-- Other third-party libraries:
-- Intel IPP: 2021.10.0 [2021.10.0]
-- at: /home/xxx/opencv/build/3rdparty/ippicv/ippicv_lnx/icv
-- Intel IPP IW: sources (2021.10.0)
-- at: /home/xxx/opencv/build/3rdparty/ippicv/ippicv_lnx/iw
-- VA: NO
-- Lapack: NO
-- Eigen: YES (ver 3.4.0)
-- Custom HAL: NO
-- Protobuf: build (3.19.1)
-- Flatbuffers: builtin/3rdparty (23.5.9)
--
-- OpenCL: YES (no extra features)
-- Include path: /home/xxx/opencv/3rdparty/include/opencl/1.2
-- Link libraries: Dynamic load
--
-- Python 3:
-- Interpreter: /usr/bin/python3 (ver 3.10.12)
-- Libraries: /usr/lib/x86_64-linux-gnu/libpython3.10.so (ver 3.10.12)
-- numpy: /usr/lib/python3/dist-packages/numpy/core/include (ver 1.21.5)
-- install path: /usr/local/lib/python3.7/dist-packages/cv2/python-3.10
--
-- Python (for build): /usr/bin/python3
--
-- Java:
-- ant: NO
-- Java: NO
-- JNI: NO
-- Java wrappers: NO
-- Java tests: NO
--
-- Install to: /usr/local
-- -----------------------------------------------------------------
--
-- Configuring done
-- Generating done