OpenCv5——error: (-215:Assertion failed) !_ Descriptors. Empty() in function ‘Add’ problem solved
OpenCV Error:
cv2.error: OpenCV(4.5.1) /private/var/folders/nz/vv4_9tw56nv9k3tkvyszvwg80000gn/T/pip-req-build-39p1qqfs/opencv/modules/imgcodecs/src/loadsave.cpp:694: error: (-215:Assertion failed) encoder->isFormatSupported(CV_8U) in function ‘imwrite_’
Solution:
img = img.astype(np.float32)
The result of error reporting is believed to be the same:
There is no Chinese in the path, but this error occurs. It feels very outrageous.
I couldn’t find the problem. Later, I wrote all the paths of the picture and found it\ F is a string formatting code. People are stupid, so friends write all the paths and find the problem.
This is the modified path:
In fact, when you see the formatting code, python will display it in another color, so I thought of it here! The path cannot be found until it is written!
An error is reported during contour detection in OpenCV
Just change the contents in the code to binary
Imread (argv [1], cv_load_image_color) in opencv4 reports an error
view the imread() function description. The second parameter
enum ImreadModes {
IMREAD_UNCHANGED = -1, //!< If set, return the loaded image as is (with alpha channel, otherwise it gets cropped). Ignore EXIF orientation.
IMREAD_GRAYSCALE = 0, //!< If set, always convert image to the single channel grayscale image (codec internal conversion).
IMREAD_COLOR = 1, //!< If set, always convert image to the 3 channel BGR color image.
IMREAD_ANYDEPTH = 2, //!< If set, return 16-bit/32-bit image when the input has the corresponding depth, otherwise convert it to 8-bit.
IMREAD_ANYCOLOR = 4, //!< If set, the image is read in any possible color format.
IMREAD_LOAD_GDAL = 8, //!< If set, use the gdal driver for loading the image.
IMREAD_REDUCED_GRAYSCALE_2 = 16, //!< If set, always convert image to the single channel grayscale image and the image size reduced 1/2.
IMREAD_REDUCED_COLOR_2 = 17, //!< If set, always convert image to the 3 channel BGR color image and the image size reduced 1/2.
IMREAD_REDUCED_GRAYSCALE_4 = 32, //!< If set, always convert image to the single channel grayscale image and the image size reduced 1/4.
IMREAD_REDUCED_COLOR_4 = 33, //!< If set, always convert image to the 3 channel BGR color image and the image size reduced 1/4.
IMREAD_REDUCED_GRAYSCALE_8 = 64, //!< If set, always convert image to the single channel grayscale image and the image size reduced 1/8.
IMREAD_REDUCED_COLOR_8 = 65, //!< If set, always convert image to the 3 channel BGR color image and the image size reduced 1/8.
IMREAD_IGNORE_ORIENTATION = 128 //!< If set, do not rotate the image according to EXIF's orientation flag.
};
Change the second parameter to imread_Grayscale is enough.
The second method:
Add header file:
#include <opencv2/imgcodecs/legacy/constants_c.h>
At this time, the parameter CV_LOAD_IMAGE_Color will not report an error.
Error reporting of OpenCV and Darknet under Python 2.7
Python 2.7 is run by default during the whole ROS. I don’t know how to adjust it, so Yolo can’t run. The following error is reported
Gtk-ERROR **: GTK+ 2.x symbols detected. Using GTK+ 2.x and GTK+ 3 in the same process is not supported
The solution is to recompile opencv in the following order
cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D WITH_TBB=ON -D BUILD_NEW_PYTHON_SUPPORT=ON -D WITH_V4L=ON -D INSTALL_C_EXAMPLES=ON -D INSTALL_PYTHON_EXAMPLES=ON -D BUILD_EXAMPLES=ON -D WITH_QT=ON -D WITH_GTK=ON -D WITH_OPENGL=ON ..
sudo make install
Open the debug button to see if the build suite has been modified or not
You need to ensure that the build kit is x86 or x64 relative to OpenCV
After switching to mingw32 bit, it runs successfully.
Ubuntu 18.04 installation of opencv2.4.13 encountered fatal error. Possible solutions
During the installation process, some fatal errors may occur. I haven’t found a method for a long time. I happened to see an article that the installation can be successful according to the following methods. Although the errors reported are not consistent, they can be used in this way.
Ubuntu installation opencv step pit
1、 Installation process
apt-get update
apt-get install build-essential
apt-get install cmake git libgtk2.0-dev pkg-config libavcodec-dev libavformat-dev libswscale-dev
apt-get install python-dev python-numpy libtbb2 libtbb-dev libjpeg-dev libpng-dev libtiff-dev libjasper-dev libdc1394-22-dev
cd opencv-2.4.13
mkdir release
cd release/
cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local ..
make -j4
sudo make install
[UNK]ह_;;
CMake Error at cmake/OpenCVDetectCXXCompiler.cmake:85 (list):
CMake Error at cmake/OpenCVDetectCXXCompiler.cmake:85 (list):
list GET given empty list
Call Stack (most recent call first):
CMakeLists.txt:77 (include)
CMake Error at cmake/OpenCVDetectCXXCompiler.cmake:86 (list):
list GET given empty list
Call Stack (most recent call first):
CMakeLists.txt:77 (include)
CMake Error at cmake/OpenCVDetectCXXCompiler.cmake:89 (math):
math cannot parse the expression: "*100 + ": syntax error, unexpected
exp_TIMES, expecting exp_PLUS or exp_MINUS or exp_OPENPARENT or exp_NUMBER
(1)
Call Stack (most recent call first):
CMakeLists.txt:77 (include)
Solution
replace the contents of opencvdetectcxxcompiler.cmake with the following:
# ----------------------------------------------------------------------------
# Detect Microsoft compiler:
# ----------------------------------------------------------------------------
if(CMAKE_CL_64)
set(MSVC64 1)
endif()
if(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
set(CMAKE_COMPILER_IS_GNUCXX 1)
set(CMAKE_COMPILER_IS_CLANGCXX 1)
endif()
if(CMAKE_C_COMPILER_ID STREQUAL "Clang")
set(CMAKE_COMPILER_IS_GNUCC 1)
set(CMAKE_COMPILER_IS_CLANGCC 1)
endif()
if("${CMAKE_CXX_COMPILER};${CMAKE_C_COMPILER}" MATCHES "ccache")
set(CMAKE_COMPILER_IS_CCACHE 1)
endif()
# ----------------------------------------------------------------------------
# Detect Intel ICC compiler -- for -fPIC in 3rdparty ( UNIX ONLY ):
# see include/opencv/cxtypes.h file for related ICC & CV_ICC defines.
# NOTE: The system needs to determine if the '-fPIC' option needs to be added
# for the 3rdparty static libs being compiled. The CMakeLists.txt files
# in 3rdparty use the CV_ICC definition being set here to determine if
# the -fPIC flag should be used.
# ----------------------------------------------------------------------------
if(UNIX)
if (__ICL)
set(CV_ICC __ICL)
elseif(__ICC)
set(CV_ICC __ICC)
elseif(__ECL)
set(CV_ICC __ECL)
elseif(__ECC)
set(CV_ICC __ECC)
elseif(__INTEL_COMPILER)
set(CV_ICC __INTEL_COMPILER)
elseif(CMAKE_C_COMPILER MATCHES "icc")
set(CV_ICC icc_matches_c_compiler)
endif()
endif()
if(MSVC AND CMAKE_C_COMPILER MATCHES "icc|icl")
set(CV_ICC __INTEL_COMPILER_FOR_WINDOWS)
endif()
# ----------------------------------------------------------------------------
# Detect GNU version:
# ----------------------------------------------------------------------------
if(CMAKE_COMPILER_IS_CLANGCXX)
set(CMAKE_GCC_REGEX_VERSION "4.2.1")
set(CMAKE_OPENCV_GCC_VERSION_MAJOR 4)
set(CMAKE_OPENCV_GCC_VERSION_MINOR 2)
set(CMAKE_OPENCV_GCC_VERSION 42)
set(CMAKE_OPENCV_GCC_VERSION_NUM 402)
execute_process(COMMAND ${CMAKE_CXX_COMPILER} ${CMAKE_CXX_COMPILER_ARG1} -v
ERROR_VARIABLE CMAKE_OPENCV_CLANG_VERSION_FULL
ERROR_STRIP_TRAILING_WHITESPACE)
string(REGEX MATCH "version.*$" CMAKE_OPENCV_CLANG_VERSION_FULL "${CMAKE_OPENCV_CLANG_VERSION_FULL}")
string(REGEX MATCH "[0-9]+\\.[0-9]+" CMAKE_CLANG_REGEX_VERSION "${CMAKE_OPENCV_CLANG_VERSION_FULL}")
elseif(CMAKE_COMPILER_IS_GNUCXX)
execute_process(COMMAND ${CMAKE_CXX_COMPILER} ${CMAKE_CXX_COMPILER_ARG1} -dumpversion
OUTPUT_VARIABLE CMAKE_OPENCV_GCC_VERSION_FULL
OUTPUT_STRIP_TRAILING_WHITESPACE)
execute_process(COMMAND ${CMAKE_CXX_COMPILER} ${CMAKE_CXX_COMPILER_ARG1} -v
ERROR_VARIABLE CMAKE_OPENCV_GCC_INFO_FULL
OUTPUT_STRIP_TRAILING_WHITESPACE)
# Typical output in CMAKE_OPENCV_GCC_VERSION_FULL: "c+//0 (whatever) 4.2.3 (...)"
# Look for the version number, major.minor.build
string(REGEX MATCH "[0-9]+\\.[0-9]+\\.[0-9]+" CMAKE_GCC_REGEX_VERSION "${CMAKE_OPENCV_GCC_VERSION_FULL}")
if(NOT CMAKE_GCC_REGEX_VERSION)#major.minor
string(REGEX MATCH "[0-9]+\\.[0-9]+" CMAKE_GCC_REGEX_VERSION "${CMAKE_OPENCV_GCC_VERSION_FULL}")
endif()
if(CMAKE_GCC_REGEX_VERSION)
# Split the parts:
string(REGEX MATCHALL "[0-9]+" CMAKE_OPENCV_GCC_VERSIONS "${CMAKE_GCC_REGEX_VERSION}")
list(GET CMAKE_OPENCV_GCC_VERSIONS 0 CMAKE_OPENCV_GCC_VERSION_MAJOR)
list(GET CMAKE_OPENCV_GCC_VERSIONS 1 CMAKE_OPENCV_GCC_VERSION_MINOR)
else()#compiler returned just the major version number
string(REGEX MATCH "[0-9]+" CMAKE_GCC_REGEX_VERSION "${CMAKE_OPENCV_GCC_VERSION_FULL}")
if(NOT CMAKE_GCC_REGEX_VERSION)#compiler did not return anything reasonable
set(CMAKE_GCC_REGEX_VERSION "0")
message(WARNING "GCC version not detected!")
endif()
set(CMAKE_OPENCV_GCC_VERSION_MAJOR ${CMAKE_GCC_REGEX_VERSION})
set(CMAKE_OPENCV_GCC_VERSION_MINOR 0)
endif()
set(CMAKE_OPENCV_GCC_VERSION ${CMAKE_OPENCV_GCC_VERSION_MAJOR}${CMAKE_OPENCV_GCC_VERSION_MINOR})
math(EXPR CMAKE_OPENCV_GCC_VERSION_NUM "${CMAKE_OPENCV_GCC_VERSION_MAJOR}*100 + ${CMAKE_OPENCV_GCC_VERSION_MINOR}")
message(STATUS "Detected version of GNU GCC: ${CMAKE_OPENCV_GCC_VERSION} (${CMAKE_OPENCV_GCC_VERSION_NUM})")
if(WIN32)
execute_process(COMMAND ${CMAKE_CXX_COMPILER} -dumpmachine
OUTPUT_VARIABLE OPENCV_GCC_TARGET_MACHINE
OUTPUT_STRIP_TRAILING_WHITESPACE)
if(OPENCV_GCC_TARGET_MACHINE MATCHES "amd64|x86_64|AMD64")
set(MINGW64 1)
endif()
endif()
endif()
if(MSVC64 OR MINGW64)
set(X86_64 1)
elseif(MINGW OR (MSVC AND NOT CMAKE_CROSSCOMPILING))
set(X86 1)
elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "amd64.*|x86_64.*|AMD64.*")
set(X86_64 1)
elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "i686.*|i386.*|x86.*|amd64.*|AMD64.*")
set(X86 1)
elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(arm.*|ARM.*)")
set(ARM 1)
elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(aarch64.*|AARCH64.*)")
set(AARCH64 1)
endif()
# Workaround for 32-bit operating systems on 64-bit x86_64 processor
if(X86_64 AND CMAKE_SIZEOF_VOID_P EQUAL 4 AND NOT FORCE_X86_64)
message(STATUS "sizeof(void) = 4 on x86/x86_64 processor. Assume 32-bit compilation mode (X86=1)")
unset(X86_64)
set(X86 1)
endif()
# Similar code exists in OpenCVConfig.cmake
if(NOT DEFINED OpenCV_STATIC)
# look for global setting
if(NOT DEFINED BUILD_SHARED_LIBS OR BUILD_SHARED_LIBS)
set(OpenCV_STATIC OFF)
else()
set(OpenCV_STATIC ON)
endif()
endif()
if(MSVC)
if(CMAKE_CL_64)
set(OpenCV_ARCH x64)
elseif((CMAKE_GENERATOR MATCHES "ARM") OR ("${arch_hint}" STREQUAL "ARM") OR (CMAKE_VS_EFFECTIVE_PLATFORMS MATCHES "ARM|arm"))
# see Modules/CmakeGenericSystem.cmake
set(OpenCV_ARCH ARM)
else()
set(OpenCV_ARCH x86)
endif()
if(MSVC_VERSION EQUAL 1400)
set(OpenCV_RUNTIME vc8)
elseif(MSVC_VERSION EQUAL 1500)
set(OpenCV_RUNTIME vc9)
elseif(MSVC_VERSION EQUAL 1600)
set(OpenCV_RUNTIME vc10)
elseif(MSVC_VERSION EQUAL 1700)
set(OpenCV_RUNTIME vc11)
elseif(MSVC_VERSION EQUAL 1800)
set(OpenCV_RUNTIME vc12)
elseif(MSVC_VERSION EQUAL 1900)
set(OpenCV_RUNTIME vc14)
elseif(MSVC_VERSION EQUAL 1910)
set(OpenCV_RUNTIME vc15)
endif()
elseif(MINGW)
set(OpenCV_RUNTIME mingw)
if(MINGW64)
set(OpenCV_ARCH x64)
else()
set(OpenCV_ARCH x86)
endif()
endif()
/Usr/include/C + +/7/cstdlib: 75:15: fatal error: stdlib. H: there is no such file or directory
solution: change the cmake instruction
cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local .. -D ENABLE_PRECOMPILED_HEADERS=OFF ..
~/opencv_contrib/modules/xfeatures2d/src/boostdesc.cpp:673:20: fatal error: boostdesc_bgm.i: No such file or directory
Solution:
Check the /home/pi/Downloads/opencv-3.4.0/build/CMakeDownloadLog.txt log file, search for boostdesc_bgm.i keyword in the log file CMakeDownloadLog.txt, and find that the download of this file has failed.
A total of 11 files were found to be missing as follows:
boostdesc_bgm.i
boostdesc_bgm_bi.i
boostdesc_bgm_hd.i
boostdesc_lbgm.i
boostdesc_binboost_064.i
boostdesc_binboost_128.i
boostdesc_binboost_256.i
vgg_generated_120.i
vgg_generated_64.i
vgg_generated_80.i
vgg_generated_48.i
Download and upzip. put them in the path of /home/pi/Downloads/opencv_contrib3.4.0/modules/xfeatures2d/src/ is OK.
Then re-compile:
make clean
make
ERROR: The minSdk version should not be declared in the android manifest file. You can move the version from the manifest to the defaultConfig in the build.gradle file.
Remove minSdkVersion and sync project
Affected Modules: openCVLibrary3415
Solution: Just comment it out and run it again!!!
ERROR: The minSdk version should not be declared in the android manifest file. You can move the version from the manifest to the defaultConfig in the build.gradle file.
Remove minSdkVersion and sync project
Affected Modules: openCVLibrary3415
Problem description
In a project using OpenCV, after changing MDD to MTD, the debug mode encountered an error.
debug_heap.cpp Line 996
if (header->_block_header_prev)
{
header->_block_header_prev->_block_header_next = header->_block_header_next;
}
else
{
_ASSERTE(__acrt_first_block == header); //# 996 LINE
__acrt_first_block = header->_block_header_next;
}
memset(header, dead_land_fill, sizeof(_CrtMemBlockHeader) + header->_data_size + no_mans_land_size);
_free_base(header);Solution
Add the following functions to region.cpp
void findContours(const cv::Mat &src, std::vector<std::vector<cv::Point>> &contours, std::vector<cv::Vec4i> &hierarchy, int retr = cv::RETR_LIST, int method = cv::CHAIN_APPROX_SIMPLE, cv::Point offset = cv::Point(0, 0))
{
using namespace cv;
CvMat c_image = src;
MemStorage storage(cvCreateMemStorage());
CvSeq *_ccontours = 0;
cvFindContours(&c_image, storage, &_ccontours, sizeof(CvContour), retr, method, CvPoint(offset));
if (!_ccontours)
{
contours.clear();
return;
}
Seq<CvSeq *> all_contours(cvTreeToNodeSeq(_ccontours, sizeof(CvSeq), storage));
int total = (int)all_contours.size();
contours.resize(total);
SeqIterator<CvSeq *> it = all_contours.begin();
for (int i = 0; i < total; i++, ++it)
{
CvSeq *c = *it;
((CvContour *)c)->color = (int)i;
int count = (int)c->total;
int *data = new int[count * 2];
cvCvtSeqToArray(c, data);
for (int j = 0; j < count; j++)
{
contours[i].push_back(Point(data[j * 2], data[j * 2 + 1]));
}
delete[] data;
}
hierarchy.resize(total);
it = all_contours.begin();
for (int i = 0; i < total; i++, ++it)
{
CvSeq *c = *it;
int h_next = c->h_next ?((CvContour *)c->h_next)->color : -1;
int h_prev = c->h_prev ?((CvContour *)c->h_prev)->color : -1;
int v_next = c->v_next ?((CvContour *)c->v_next)->color : -1;
int v_prev = c->v_prev ?((CvContour *)c->v_prev)->color : -1;
hierarchy[i] = Vec4i(h_next, h_prev, v_next, v_prev);
}
storage.release();
}There are still errors after adding, Find our business code Change this one to that one:
std::vector<cv::Mat> chs; //BEFORE
std::vector<cv::Mat> chs(m.channels()); //NEWIt can run successfully
Error: ImportError: libSM.so.6: cannot open shared object file: No such file or directory, Install opencv-python-headless