lnk2019 with opencv treshold

superdu

i originaly wrote it like that. That didn't work too.

SGaist

Is it the only symbol that fails the build ?

superdu

if i use imshow, i have this problem too. but i can use Mat. By the way i use msvc2019 (32 and 64). at the beginning i thought it was the problem. So i tried to compile it with msvc2015 but still the same problem... and i can use this functions on visual studio... the only difference is the IDE so i think i miss something but what...

SGaist

Just to make sure we are on the same base, can you describe your setup exactly ?
Which IDE are you using ?
Which exact compiler are you using ?
Which compiler was used for OpenCV and for Qt ?

superdu

for my project i use QtCreator but sometime, juste for test i use visual studio.
for openCV i used the package manager vcpkg but as that work on my vs i think its compile with msvc2019.
qt i just used the installer. i let here systems info from QtCreator:

{noformat}
Qt 5.15.2 (x86_64-little_endian-llp64 shared (dynamic) release build; by MSVC 2019) on "windows"
OS: Windows 10 Version 2009 [winnt version 10.0.19042]

Architecture: x86_64; features: SSE2 SSE3 SSSE3 SSE4.1 SSE4.2 AVX AVX2

Environment:
Qt5_DIR="D:\Qt\5.15.2\msvc2019_64"
QtMsBuild="C:\Users\antoi\AppData\Local\QtMsBuild"

Features: QT_NO_EXCEPTIONS

Library info:
PrefixPath: D:\Qt\Tools\QtCreator\bin
DocumentationPath: D:\Qt\Tools\QtCreator\bin\doc
HeadersPath: D:\Qt\Tools\QtCreator\bin\include
LibrariesPath: D:\Qt\Tools\QtCreator\bin
LibraryExecutablesPath: D:\Qt\Tools\QtCreator\bin\bin
BinariesPath: D:\Qt\Tools\QtCreator\bin
PluginsPath: D:\Qt\Tools\QtCreator\bin\plugins
ImportsPath: D:\Qt\Tools\QtCreator\bin\imports
Qml2ImportsPath: D:\Qt\Tools\QtCreator\bin\qml
ArchDataPath: D:\Qt\Tools\QtCreator\bin
DataPath: D:\Qt\Tools\QtCreator\bin
TranslationsPath: D:\Qt\Tools\QtCreator\bin\translations
ExamplesPath: D:\Qt\Tools\QtCreator\bin\examples
TestsPath: D:\Qt\Tools\QtCreator\bin\tests
SettingsPath:

Standard paths [... denote writable entry]:
DesktopLocation: "Desktop" C:\Users\antoi\OneDrive\Bureau
DocumentsLocation: "Documents" C:\Users\antoi\OneDrive\Documents
FontsLocation: "Fonts" C:\WINDOWS\Fonts
ApplicationsLocation: "Applications" C:\Users\antoi\AppData\Roaming\Microsoft\Windows\Start Menu\Programs
MusicLocation: "Music" C:\Users\antoi\Music
MoviesLocation: "Movies" C:\Users\antoi\Videos
PicturesLocation: "Pictures" C:\Users\antoi\OneDrive\Images
TempLocation: "Temporary Directory" C:\Users\antoi\AppData\Local\Temp
HomeLocation: "Home" C:\Users\antoi
AppLocalDataLocation: "Application Data" C:\Users\antoi\AppData\Local\QtProject\qtdiag C:\ProgramData\QtProject\qtdiag D:\Qt\Tools\QtCreator\bin D:\Qt\Tools\QtCreator\bin\data D:\Qt\Tools\QtCreator\bin\data\QtProject\qtdiag
CacheLocation: "Cache" C:\Users\antoi\AppData\Local\QtProject\qtdiag\cache
GenericDataLocation: "Shared Data" C:\Users\antoi\AppData\Local C:\ProgramData D:\Qt\Tools\QtCreator\bin D:\Qt\Tools\QtCreator\bin\data
RuntimeLocation: "Runtime" C:\Users\antoi
ConfigLocation: "Configuration" C:\Users\antoi\AppData\Local\QtProject\qtdiag C:\ProgramData\QtProject\qtdiag D:\Qt\Tools\QtCreator\bin D:\Qt\Tools\QtCreator\bin\data D:\Qt\Tools\QtCreator\bin\data\QtProject\qtdiag
DownloadLocation: "Download" C:\Users\antoi\Downloads
GenericCacheLocation: "Shared Cache" C:\Users\antoi\AppData\Local\cache
GenericConfigLocation: "Shared Configuration" C:\Users\antoi\AppData\Local C:\ProgramData D:\Qt\Tools\QtCreator\bin D:\Qt\Tools\QtCreator\bin\data
AppDataLocation: "Application Data" C:\Users\antoi\AppData\Roaming\QtProject\qtdiag C:\ProgramData\QtProject\qtdiag D:\Qt\Tools\QtCreator\bin D:\Qt\Tools\QtCreator\bin\data D:\Qt\Tools\QtCreator\bin\data\QtProject\qtdiag
AppConfigLocation: "Application Configuration" C:\Users\antoi\AppData\Local\QtProject\qtdiag C:\ProgramData\QtProject\qtdiag D:\Qt\Tools\QtCreator\bin D:\Qt\Tools\QtCreator\bin\data D:\Qt\Tools\QtCreator\bin\data\QtProject\qtdiag

File selectors (increasing order of precedence):
fr_FR windows winnt

Network:
Using "OpenSSL 1.1.1d 10 Sep 2019", version: 0x1010104f

Platform capabilities: ThreadedPixmaps OpenGL ThreadedOpenGL WindowMasks MultipleWindows ForeignWindows NonFullScreenWindows NativeWidgets WindowManagement RasterGLSurface AllGLFunctionsQueryable

Style hints:
mouseDoubleClickInterval: 500
mousePressAndHoldInterval: 800
startDragDistance: 10
startDragTime: 500
startDragVelocity: 0
keyboardInputInterval: 400
keyboardAutoRepeatRate: 32
cursorFlashTime: 1060
showIsFullScreen: 0
showIsMaximized: 0
passwordMaskDelay: 0
passwordMaskCharacter: U+25CF
fontSmoothingGamma: 1
useRtlExtensions: 0
setFocusOnTouchRelease: 0
tabFocusBehavior: Qt::TabFocusAllControls
singleClickActivation: 0

Additional style hints (QPlatformIntegration):
ReplayMousePressOutsidePopup: 1

Theme:
Platforms requested : windows
available : snap,flatpak,xdgdesktopportal
Styles requested : WindowsVista,Windows
available : windowsvista,Windows,Fusion
System font : "MS Shell Dlg 2" 8
Native file dialog

Fonts:
General font : "MS Shell Dlg 2" 8
Fixed font : "Courier New" 9
Title font : "MS Shell Dlg 2" 8
Smallest font: "MS Shell Dlg 2" 8

Palette:
QPalette::WindowText: #ff000000
QPalette::Button: #fff0f0f0
QPalette::Light: #ffffffff
QPalette::Midlight: #ffe3e3e3
QPalette::Dark: #ffa0a0a0
QPalette::Mid: #ffa0a0a0
QPalette::Text: #ff000000
QPalette::BrightText: #ffffffff
QPalette::ButtonText: #ff000000
QPalette::Base: #ffffffff
QPalette::Window: #fff0f0f0
QPalette::Shadow: #ff696969
QPalette::Highlight: #ff0078d7
QPalette::HighlightedText: #ffffffff
QPalette::Link: #ff0000ff
QPalette::LinkVisited: #ffff00ff
QPalette::AlternateBase: #ffe9e7e3
QPalette::NoRole: #ff000000
QPalette::ToolTipBase: #ffffffdc
QPalette::ToolTipText: #ff000000
QPalette::PlaceholderText: #80000000

Screens: 1, High DPI scaling: inactive

0 "\.\DISPLAY1" Depth: 32 Primary: yes

Manufacturer:
Model:
Serial number:
Geometry: 1920x1080+0+0 Available: 1920x1040+0+0
Physical size: 382x215 mm Refresh: 144 Hz Power state: 0
Physical DPI: 127.665,127.591 Logical DPI: 96,96 Subpixel_None
DevicePixelRatio: 1 Pixel density: 1
Primary orientation: 2 Orientation: 2 Native orientation: 0 OrientationUpdateMask: 0

Dynamic GL LibGL Vendor: NVIDIA Corporation
Renderer: NVIDIA GeForce RTX 2060/PCIe/SSE2
Version: 4.6.0 NVIDIA 466.63
Shading language: 4.60 NVIDIA
Format: Version: 4.6 Profile: 2 Swap behavior: 2 Buffer size (RGBA): 8,8,8,8 Depth buffer: 24 Stencil buffer: 8
Profile: None (QOpenGLFunctions_4_6)

Vulkan instance available
Supported instance extensions:
VK_KHR_device_group_creation, version 1
VK_KHR_display, version 23
VK_KHR_external_fence_capabilities, version 1
VK_KHR_external_memory_capabilities, version 1
VK_KHR_external_semaphore_capabilities, version 1
VK_KHR_get_display_properties2, version 1
VK_KHR_get_physical_device_properties2, version 2
VK_KHR_get_surface_capabilities2, version 1
VK_KHR_surface, version 25
VK_KHR_surface_protected_capabilities, version 1
VK_KHR_win32_surface, version 6
VK_EXT_debug_report, version 9
VK_EXT_debug_utils, version 2
VK_EXT_swapchain_colorspace, version 4
VK_NV_external_memory_capabilities, version 1
Supported layers:
VK_LAYER_NV_optimus, version 1, spec version 1.2.168, NVIDIA Optimus layer
VK_LAYER_VALVE_steam_overlay, version 1, spec version 1.2.136, Steam Overlay Layer
VK_LAYER_VALVE_steam_fossilize, version 1, spec version 1.2.136, Steam Pipeline Caching Layer
VK_LAYER_EOS_Overlay, version 1, spec version 1.2.136, Vulkan overlay layer for Epic Online Services
VK_LAYER_EOS_Overlay, version 1, spec version 1.2.136, Vulkan overlay layer for Epic Online Services
Available physical devices:
API version 1.2.168, vendor 0x10DE, device 0x1F11, NVIDIA GeForce RTX 2060, type 2, driver version 466.252.0

GPU #1:
Card name : NVIDIA GeForce RTX 2060
Driver Name : nvldumdx.dll
Driver Version : 27.21.14.6663
Vendor ID : 0x10DE
Device ID : 0x1F11
SubSys ID : 0x3FFD17AA
Revision ID : 0x00A1

Qt Rendering Hardware Interface supported backends:
OpenGL (with default QSurfaceFormat):
Min Texture Size: 1
Max Texture Size: 32768
Max Color Attachments: 8
Frames in Flight: 1
Uniform Buffer Alignment: 1
Supported MSAA sample counts: 1,2,4,8,16,32
Features:
- MultisampleTexture
v MultisampleRenderBuffer
- DebugMarkers
- Timestamps
v Instancing
- CustomInstanceStepRate
v PrimitiveRestart
v NonDynamicUniformBuffers
v NonFourAlignedEffectiveIndexBufferOffset
v NPOTTextureRepeat
- RedOrAlpha8IsRed
v ElementIndexUint
v Compute
v WideLines
v VertexShaderPointSize
v BaseVertex
- BaseInstance
v TriangleFanTopology
v ReadBackNonUniformBuffer
v ReadBackNonBaseMipLevel
Texture formats: RGBA8 BGRA8 R8 R16 RED_OR_ALPHA8 RGBA16F RGBA32F R16F R32F D16 D32F BC1 BC2 BC3 ETC2_RGB8 ETC2_RGB8A1 ETC2_RGBA8 ASTC_4x4 ASTC_5x4 ASTC_5x5 ASTC_6x5 ASTC_6x6 ASTC_8x5 ASTC_8x6 ASTC_8x8 ASTC_10x5 ASTC_10x6 ASTC_10x8 ASTC_10x10 ASTC_12x10 ASTC_12x12
Vulkan:
Min Texture Size: 1
Max Texture Size: 32768
Max Color Attachments: 8
Frames in Flight: 2
Uniform Buffer Alignment: 64
Supported MSAA sample counts: 1,2,4,8
Features:
v MultisampleTexture
v MultisampleRenderBuffer
- DebugMarkers
v Timestamps
v Instancing
- CustomInstanceStepRate
v PrimitiveRestart
v NonDynamicUniformBuffers
v NonFourAlignedEffectiveIndexBufferOffset
v NPOTTextureRepeat
v RedOrAlpha8IsRed
v ElementIndexUint
v Compute
v WideLines
v VertexShaderPointSize
v BaseVertex
v BaseInstance
v TriangleFanTopology
v ReadBackNonUniformBuffer
v ReadBackNonBaseMipLevel
Texture formats: RGBA8 BGRA8 R8 R16 RED_OR_ALPHA8 RGBA16F RGBA32F R16F R32F D16 D32F BC1 BC2 BC3 BC4 BC5 BC6H BC7
Direct3D 11:
Min Texture Size: 1
Max Texture Size: 16384
Max Color Attachments: 8
Frames in Flight: 1
Uniform Buffer Alignment: 256
Supported MSAA sample counts: 1,2,4,8
Features:
v MultisampleTexture
v MultisampleRenderBuffer
v DebugMarkers
v Timestamps
v Instancing
v CustomInstanceStepRate
v PrimitiveRestart
- NonDynamicUniformBuffers
v NonFourAlignedEffectiveIndexBufferOffset
v NPOTTextureRepeat
v RedOrAlpha8IsRed
v ElementIndexUint
v Compute
- WideLines
- VertexShaderPointSize
v BaseVertex
v BaseInstance
- TriangleFanTopology
v ReadBackNonUniformBuffer
v ReadBackNonBaseMipLevel
Texture formats: RGBA8 BGRA8 R8 R16 RED_OR_ALPHA8 RGBA16F RGBA32F R16F R32F D16 D32F BC1 BC2 BC3 BC4 BC5 BC6H BC7

Plugin information:

Android 4.15.0
AutoTest 4.15.0
AutotoolsProjectManager 4.15.0
BareMetal 4.15.0
Bazaar 4.15.0
Beautifier 4.15.0
BinEditor 4.15.0
Bookmarks 4.15.0
Boot2Qt 4.15.0
CMakeProjectManager 4.15.0
CVS 4.15.0
ClangCodeModel 4.15.0
ClangFormat 4.15.0
ClangTools 4.15.0
ClassView 4.15.0
ClearCase 4.15.0
CodePaster 4.15.0
CompilationDatabaseProjectManager 4.15.0
Conan 4.15.0
Core 4.15.0
CppEditor 4.15.0
CppTools 4.15.0
Cppcheck 4.15.0
CtfVisualizer 4.15.0
Debugger 4.15.0
Designer 4.15.0
DiffEditor 4.15.0
EmacsKeys 4.15.0
FakeVim 4.15.0
GLSLEditor 4.15.0
GenericProjectManager 4.15.0
Git 4.15.0
HelloWorld 4.15.0
Help 4.15.0
ImageViewer 4.15.0
IncrediBuild 4.15.0
Ios 4.15.0
LanguageClient 4.15.0
Macros 4.15.0
Marketplace 4.15.0
McuSupport 4.15.0
Mercurial 4.15.0
MesonProjectManager 4.15.0
ModelEditor 4.15.0
Nim 4.15.0
PerfProfiler 4.15.0
Perforce 4.15.0
ProjectExplorer 4.15.0
Python 4.15.0
QbsProjectManager 4.15.0
QmakeProjectManager 4.15.0
QmlDesigner 4.15.0
QmlJSEditor 4.15.0
QmlJSTools 4.15.0
QmlPreview 4.15.0
QmlProfiler 4.15.0
QmlProjectManager 4.15.0
Qnx 4.15.0
QtSupport 4.15.0
RemoteLinux 4.15.0
ResourceEditor 4.15.0
ScxmlEditor 4.15.0
SerialTerminal 4.15.0
SilverSearcher 4.15.0
StudioWelcome 4.15.0
Subversion 4.15.0
TaskList 4.15.0
TextEditor 4.15.0
Todo 4.15.0
UpdateInfo 4.15.0
Valgrind 4.15.0
VcsBase 4.15.0
WebAssembly 4.15.0
Welcome 4.15.0
WinRt 4.15.0

Qt Creator 4.15.0
Basé sur Qt 5.15.2 (MSVC 2019, 64 bit)
From revision 978f6caf1e
Built on May 4 2021 01:16:56

{noformat}

SGaist

Ok... nothing stands out as wrong.

Can you start from a default Qt project and just one OpenCV method there ?

It might be easier to debug your issue.

superdu

ok so here the code (thank you for your time by the way):

cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    Mat new_img = Mat::zeros(25, 25, CV_16U);
    Mat dest;

    threshold(new_img,dest,200,255,THRESH_BINARY | THRESH_OTSU);

}

MainWindow::~MainWindow()
{
    delete ui;
}

header

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <opencv2/core.hpp>
#include <opencv2/highgui.hpp>
#include <opencv2/imgcodecs.hpp>
#include <opencv2/opencv.hpp>
#include "opencv2/imgproc.hpp"

using namespace cv;

QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = nullptr);
    ~MainWindow();

private:
    Ui::MainWindow *ui;
};
#endif // MAINWINDOW_H

pro

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

CONFIG += c++11

# You can make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

SOURCES += \
    main.cpp \
    mainwindow.cpp

HEADERS += \
    mainwindow.h

FORMS += \
    mainwindow.ui

INCLUDEPATH += C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/include

LIBS += C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_calib3d.lib
LIBS += C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_core.lib
LIBS += C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_dnn.lib
LIBS += C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_features2d.lib
LIBS += C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_flann.lib
LIBS += C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_highgui.lib
LIBS += C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_imgcodecs.lib
LIBS += C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_imgproc.lib
LIBS += C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_ml.lib
LIBS += C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_objdetect.lib
LIBS += C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_photo.lib
LIBS += C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_stitching.lib
LIBS += C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_video.lib
LIBS += C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_videoio.lib


TRANSLATIONS += \
    test_fr_FR.ts
CONFIG += lrelease
CONFIG += embed_translations

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

the code reproduce the problem for me:

mainwindow.obj:-1: erreur : LNK2019: symbole externe non r‚solu "double __cdecl cv::threshold(class cv::debug_build_guard::_InputArray const &,class cv::debug_build_guard::_OutputArray const &,double,double,int)" (?threshold@cv@@YANAEBV_InputArray@debug_build_guard@1@AEBV_OutputArray@31@NNH@Z) r‚f‚renc‚ dans la fonction "public: __cdecl MainWindow::MainWindow(class QWidget *)" (??0MainWindow@@QEAA@PEAVQWidget@@@Z)

SGaist

Does the build output show that the libraries are currently linked ?

By the way, you should move all your includes to the .cpp file. There's nothing in the header that uses OpenCV.

superdu

here the compile output:

21:18:53: Running steps for project test...
21:18:53: Configuration unchanged, skipping qmake step.
21:18:53: Starting: "D:\Qt\Tools\QtCreator\bin\jom.exe"
D:\Qt\Tools\QtCreator\bin\jom.exe -f Makefile.Debug
link /NOLOGO /DYNAMICBASE /NXCOMPAT /DEBUG /SUBSYSTEM:WINDOWS "/MANIFESTDEPENDENCY:type='win32' name='Microsoft.Windows.Common-Controls' version='6.0.0.0' publicKeyToken='6595b64144ccf1df' language='' processorArchitecture=''" /MANIFEST:embed /OUT:debug\test.exe @C:\Users\antoi\AppData\Local\Temp\test.exe.16732.0.jom
mainwindow.obj : error LNK2019: unresolved external symbol "double __cdecl cv::threshold(class cv::debug_build_guard::_InputArray const &,class cv::debug_build_guard::_OutputArray const &,double,double,int)" (?threshold@cv@@YANAEBV_InputArray@debug_build_guard@1@AEBV_OutputArray@31@NNH@Z) referenced in function "public: __cdecl MainWindow::MainWindow(class QWidget *)" (??0MainWindow@@QEAA@PEAVQWidget@@@Z)
debug\test.exe : fatal error LNK1120: 1 unresolved externals
jom: C:\Users\antoi\OneDrive\Documents\QTtest\build-test-Desktop_Qt_5_15_2_MSVC2019_64bit-Debug\Makefile.Debug [debug\test.exe] Error 1120
jom: C:\Users\antoi\OneDrive\Documents\QTtest\build-test-Desktop_Qt_5_15_2_MSVC2019_64bit-Debug\Makefile [debug] Error 2
21:18:53: The process "D:\Qt\Tools\QtCreator\bin\jom.exe" exited with code 2.
Error while building/deploying project test (kit: Desktop Qt 5.15.2 MSVC2019 64bit)
When executing step "Make"
21:18:53: Elapsed time: 00:00.

SGaist

Ok... does the Makefile contain any references to OpenCV ?

superdu

no indeed... they are no reference to opencv:

#############################################################################

Makefile for building: test

Generated by qmake (3.1) (Qt 5.15.2)

Project: ..\test\test.pro

Template: app

Command: D:\Qt\5.15.2\msvc2019_64\bin\qmake.exe -o Makefile ..\test\test.pro -spec win32-msvc "CONFIG+=debug" "CONFIG+=qml_debug"

#############################################################################

MAKEFILE = Makefile

EQ = =

first: debug
install: debug-install
uninstall: debug-uninstall
QMAKE = D:\Qt\5.15.2\msvc2019_64\bin\qmake.exe
DEL_FILE = del
CHK_DIR_EXISTS= if not exist
MKDIR = mkdir
COPY = copy /y
COPY_FILE = copy /y
COPY_DIR = xcopy /s /q /y /i
INSTALL_FILE = copy /y
INSTALL_PROGRAM = copy /y
INSTALL_DIR = xcopy /s /q /y /i
QINSTALL = D:\Qt\5.15.2\msvc2019_64\bin\qmake.exe -install qinstall
QINSTALL_PROGRAM = D:\Qt\5.15.2\msvc2019_64\bin\qmake.exe -install qinstall -exe
DEL_FILE = del
SYMLINK = $(QMAKE) -install ln -f -s
DEL_DIR = rmdir
MOVE = move
IDC = idc
IDL = midl
ZIP = zip -r -9
DEF_FILE =
RES_FILE =
SED = $(QMAKE) -install sed
MOVE = move
SUBTARGETS =
debug
release

debug: $(MAKEFILE) FORCE
@set MAKEFLAGS=$(MAKEFLAGS)
$(MAKE) -f $(MAKEFILE).Debug
debug-make_first: FORCE
@set MAKEFLAGS=$(MAKEFLAGS)
$(MAKE) -f $(MAKEFILE).Debug
debug-all: FORCE
@set MAKEFLAGS=$(MAKEFLAGS)
$(MAKE) -f $(MAKEFILE).Debug all
debug-clean: FORCE
@set MAKEFLAGS=$(MAKEFLAGS)
$(MAKE) -f $(MAKEFILE).Debug clean
debug-distclean: FORCE
@set MAKEFLAGS=$(MAKEFLAGS)
$(MAKE) -f $(MAKEFILE).Debug distclean
debug-install: FORCE
@set MAKEFLAGS=$(MAKEFLAGS)
$(MAKE) -f $(MAKEFILE).Debug install
debug-uninstall: FORCE
@set MAKEFLAGS=$(MAKEFLAGS)
$(MAKE) -f $(MAKEFILE).Debug uninstall
release: $(MAKEFILE) FORCE
@set MAKEFLAGS=$(MAKEFLAGS)
$(MAKE) -f $(MAKEFILE).Release
release-make_first: FORCE
@set MAKEFLAGS=$(MAKEFLAGS)
$(MAKE) -f $(MAKEFILE).Release
release-all: FORCE
@set MAKEFLAGS=$(MAKEFLAGS)
$(MAKE) -f $(MAKEFILE).Release all
release-clean: FORCE
@set MAKEFLAGS=$(MAKEFLAGS)
$(MAKE) -f $(MAKEFILE).Release clean
release-distclean: FORCE
@set MAKEFLAGS=$(MAKEFLAGS)
$(MAKE) -f $(MAKEFILE).Release distclean
release-install: FORCE
@set MAKEFLAGS=$(MAKEFLAGS)
$(MAKE) -f $(MAKEFILE).Release install
release-uninstall: FORCE
@set MAKEFLAGS=$(MAKEFLAGS)
$(MAKE) -f $(MAKEFILE).Release uninstall

Makefile: ..\test\test.pro D:\Qt\5.15.2\msvc2019_64\mkspecs\win32-msvc\qmake.conf D:\Qt\5.15.2\msvc2019_64\mkspecs\features\spec_pre.prf
...
D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_3dcore_private.pri
D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_3dextras.pri
D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_3dextras_private.pri
D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_3dinput.pri
D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_3dinput_private.pri
D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_3dlogic.pri
D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_3dlogic_private.pri
D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_3dquick.pri
D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_3dquick_private.pri
D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_3dquickanimation.pri
D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_3dquickanimation_private.pri
D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_3dquickextras.pri
D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_3dquickextras_private.pri
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release\qmake_qmake_qm_files.qrc:
qmake: FORCE
@$(QMAKE) -o Makefile ..\test\test.pro -spec win32-msvc "CONFIG+=debug" "CONFIG+=qml_debug"

qmake_all: FORCE

make_first: debug-make_first release-make_first FORCE
all: debug-all release-all FORCE
clean: debug-clean release-clean FORCE
-$(DEL_FILE) test.vc.pdb
-$(DEL_FILE) test.ilk
-$(DEL_FILE) test.idb
distclean: debug-distclean release-distclean FORCE
-$(DEL_FILE) Makefile
-$(DEL_FILE) .qmake.stash test.pdb

debug-mocclean:
@set MAKEFLAGS=$(MAKEFLAGS)
$(MAKE) -f $(MAKEFILE).Debug mocclean
release-mocclean:
@set MAKEFLAGS=$(MAKEFLAGS)
$(MAKE) -f $(MAKEFILE).Release mocclean
mocclean: debug-mocclean release-mocclean

debug-mocables:
@set MAKEFLAGS=$(MAKEFLAGS)
$(MAKE) -f $(MAKEFILE).Debug mocables
release-mocables:
@set MAKEFLAGS=$(MAKEFLAGS)
$(MAKE) -f $(MAKEFILE).Release mocables
mocables: debug-mocables release-mocables

check: first

benchmark: first
FORCE:

$(MAKEFILE).Debug: Makefile
$(MAKEFILE).Release: Makefile

SGaist

You are missing the "-l" in your LIBS lines.

superdu

hum, but they are presents in makefile.debug

i also try again this notation but still the same problem

LIBS += -L"C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib" -lopencv_calib3d
LIBS += -L"C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib" -lopencv_core
LIBS += -L"C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib" -lopencv_dnn
LIBS += -L"C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib" -lopencv_features2d
LIBS += -L"C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib" -lopencv_flann
LIBS += -L"C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib" -lopencv_highgui
LIBS += -L"C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib" -lopencv_imgcodecs
LIBS += -L"C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib" -lopencv_imgproc
LIBS += -L"C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib" -lopencv_ml
LIBS += -L"C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib" -lopencv_objdetect
LIBS += -L"C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib" -lopencv_photo
LIBS += -L"C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib" -lopencv_stitching
LIBS += -L"C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib" -lopencv_video
LIBS += -L"C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib" -lopencv_videoio

SGaist

So if you build in debug mode it works ?

superdu

no... i dont know why but i feel if we find the problem that will be something really stupid. and if not i will just try to compile by hand opencv but that should work like that

SGaist

Are these static or dynamic librairies ?

In any case, what I would do is simplify things with the LIBS part to only link to opencv_core and only use symbols from that library in the sample application.

This will restrict the scope of the issue.

superdu

i just checked it with lib.exe and libs file containes dll. its dynamics library

superdu

ok so i compile by hand opencv following this step: https://wiki.qt.io/How_to_setup_Qt_and_openCV_on_Windows_with_MSVC2017#Building_OpenCV

the two difference is i use msvc 2019 and opencv 4.5.1.

compilation seems to be a succes but when i try to us it in qt the application crash without any information

SGaist

If there's a crash then it likely is that the dlls are not found at run time. Go to the Run part of the Project panel and update the PATH environment variable there so that the folder containing the OpenCV dlls are found.

superdu

Ok my bad. i already added to path but i didnt restart my computer. i just restart it and that work well.

result: no more problem and treshold function work. thank you so much for your time!