guillaume-tgl's profile - activity

Hi,

I'm trying to replace libjpeg by libjpeg-turbo to speed up reading and writing images on Android. I've successfully used the turbo API directly to verify image IO operations were faster but I'd like to use OpenCV to read and write images as it handles multiple formats and exif orientation. I removed the linkage with libjpeg in OpenCV.mk and now, when I read images with imread, I get an empty image. Any clue to make this work?

Have you been able to use libjpeg turbo with OpenCV 3.1 finally? I've removed liblibjpeg.a from 3rd party libs and I get everything to compile but when I call imread, the returned image is always empty.

Thanks for the explanations Alexander! I figured it out before seeing your answer and modified OpenCV.mk with the following lines so that it's compatible with armeabi and armeabi-v7a:

ifeq ($(TARGET_ARCH_ABI),armeabi)
    OPENCV_3RDPARTY_COMPONENTS:=libjpeg libpng libtiff libjasper IlmImf
endif
ifeq ($(TARGET_ARCH_ABI),armeabi-v7a)
    OPENCV_3RDPARTY_COMPONENTS:=tbb libjpeg libpng libtiff libjasper IlmImf
endif

Hi,

I'm trying to compile a native application with OpenCV 2.4.3 for Android. I have no problem compiling and linking for armeabi-v7a since the lib libtbb.a is present under sdk/native/3rdparty/libs/armeabi-v7a.

However, this lib is not present under sdk/native/3rdparty/libs/armeabi and thus, I'm getting linkage errors such as : undefined reference to 'vtable for tbb::task'.

Is this lib really missing or am I missing something? Can I simply use the same lib as for armeabi-v7a?

Guillaume