Opencv in Android

OliveiraNT · 8 Jan 2016, 19:58

I'm trying to use the openCV libraries in a android application but I'm having problems to do this, someone knows a way to do this work?

Edit: I'm using ubuntu 14.04, Qt 5.7 and OpenCV 3.0.

SGaist · wrote on 25 Jul 2016, 21:16

Hi,

That's a bit vague. What did you try ? What errors are you getting ? Can you make a "pure" OpenCV sample application run on your Android device ?

OliveiraNT · wrote on 26 Jul 2016, 18:50

I just followed this tutorial but when a try it I'm still not able to include OpenCV libraries in my project and I receive the message "No such file or directory"

SGaist · wrote on 26 Jul 2016, 21:33

Can you share you .pro file and what file isn't found ?

OliveiraNT · wrote on 27 Jul 2016, 16:34

Sure, actually my .pro file is

TEMPLATE = app

QT += qml quick
CONFIG += c++11

SOURCES += main.cpp \
    imagerecog.cpp

INCLUDEPATH += /usr/local/include/opencv
LIBS += -L/usr/local/lib -lopencv_core -lopencv_imgcodecs -lopencv_highgui

RESOURCES += qml.qrc


# Additional import path used to resolve QML modules in Qt Creator's code model
QML_IMPORT_PATH =

# Default rules for deployment.
include(deployment.pri)

DISTFILES += \
    android/AndroidManifest.xml \
    android/gradle/wrapper/gradle-wrapper.jar \
    android/gradlew \
    android/res/values/libs.xml \
    android/build.gradle \
    android/gradle/wrapper/gradle-wrapper.properties \
    android/gradlew.bat

ANDROID_PACKAGE_SOURCE_DIR = $$PWD/android

HEADERS += \
    imagerecog.h

And the error happens when I try to include the OpenCV libs

Ex: #include <opencv2/opencv.hpp>

And its not found

SGaist · wrote on 27 Jul 2016, 21:25

Shouldn't that rather be INCLUDEPATH += /usr/local/include/ ?

IIRC, the opencv and opencv2 folder are in the same directory.

OliveiraNT · wrote on 28 Jul 2016, 18:31

When I try this I can include the libs but in build I receive this errors
this erros:
:-1: error: error: cannot find -lopencv_core
:-1: error: error: cannot find -lopencv_imgcodecs
:-1: error: error: cannot find -lopencv_highgui
:-1: error: collect2: error: ld returned 1 exit status

SGaist · wrote on 28 Jul 2016, 20:35

What are the exact name of the libraries you have there ?

OliveiraNT · 31 Jul 2016, 15:38

In the usr/local/lib folder -> libopencv_core.so, libopencv_highgui.so, libopencv_imgcodecs.so;

SGaist · wrote on 29 Jul 2016, 21:14

No version number ?

benlau · wrote on 31 Jul 2016, 15:38

@OliveiraNT said:

In the usr/local/lib folder -> libopencv_core.so, libopencv_highgui.so, libopencv_imgcodecs.so;

Are you really using opencv for Android? The prebuilt package should only contains .a file for the library above.

OliveiraNT · wrote on 1 Aug 2016, 19:48

@benlau and @SGaist tanks for the help, I didn't know there is an openCV just for android.
I solved my problem adding the openCV sdk for android at my project with this:

TEMPLATE = app

QT += qml quick
CONFIG += c++11

SOURCES += main.cpp \
    processaimagem.cpp \
    provedorimagem.cpp

INCLUDEPATH += /home/gpca/Qt/OpenCV-android-sdk/sdk/native/jni/include
OPENCV3RDPARTYLIBS = /home/gpca/Qt/OpenCV-android-sdk/sdk/native/3rdparty/libs/armeabi-v7a
OPENCVNATIVELIBS = /home/gpca/Qt/OpenCV-android-sdk/sdk/native/libs/armeabi-v7a
LIBS += $$OPENCV3RDPARTYLIBS/liblibtiff.a
$$OPENCV3RDPARTYLIBS/liblibjpeg.a
$$OPENCV3RDPARTYLIBS/liblibjasper.a
$$OPENCV3RDPARTYLIBS/liblibpng.a
$$OPENCV3RDPARTYLIBS/libtbb.a
$$OPENCV3RDPARTYLIBS/libIlmImf.a
LIBS += $$OPENCVNATIVELIBS/libopencv_core.a
$$OPENCVNATIVELIBS/libopencv_androidcamera.a
$$OPENCVNATIVELIBS/libopencv_flann.a
$$OPENCVNATIVELIBS/libopencv_imgproc.a
$$OPENCVNATIVELIBS/libopencv_highgui.a
$$OPENCVNATIVELIBS/libopencv_features2d.a
$$OPENCVNATIVELIBS/libopencv_calib3d.a
$$OPENCVNATIVELIBS/libopencv_ml.a
$$OPENCVNATIVELIBS/libopencv_objdetect.a
$$OPENCVNATIVELIBS/libopencv_photo.a
$$OPENCVNATIVELIBS/libopencv_stitching.a
$$OPENCVNATIVELIBS/libopencv_superres.a
$$OPENCVNATIVELIBS/libopencv_ts.a
$$OPENCVNATIVELIBS/libopencv_video.a
$$OPENCVNATIVELIBS/libopencv_videostab.a
$$OPENCVNATIVELIBS/libopencv_java.so

ANDROID_PACKAGE_SOURCE_DIR = $$PWD/android-sources

RESOURCES += qml.qrc


# Additional import path used to resolve QML modules in Qt Creator's code model
QML_IMPORT_PATH =

# Default rules for deployment.
include(deployment.pri)

DISTFILES += \
    android/AndroidManifest.xml \
    android/gradle/wrapper/gradle-wrapper.jar \
    android/gradlew \
    android/res/values/libs.xml \
    android/build.gradle \
    android/gradle/wrapper/gradle-wrapper.properties \
    android/gradlew.bat

ANDROID_PACKAGE_SOURCE_DIR = $$PWD/android

HEADERS += \
    processaimagem.h \
    provedorimagem.h

Again, thank you both for the help.