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Undefined reference to `fftw_init_threads' while installing pHash library

By : Istihaq Mubarak
Date : August 01 2020, 05:00 AM
I wish this helpful for you From the documentation:
code :

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Undefined reference error using static library to build shared library

By : Jappi Patel
Date : March 29 2020, 07:55 AM
wish of those help I am confused If I am doing something wrong while using the static library.
code :
include $(ROOT_DIR)/PAL/Sources/Android.mk
include $(ROOT_DIR)/mtwist-0.7/Android.mk
include $(ROOT_DIR)/boost/libs/thread/src/Android.mk
include $(ROOT_DIR)/boost/libs/thread/src/Android.mk
include $(ROOT_DIR)/mtwist-0.7/Android.mk
include $(ROOT_DIR)/PAL/Sources/Android.mk

What alternatives are there to the pHash open source perceptual hash library?

By : Prady
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , Here is an Java implementation of pHash for images by Elliot Shepherd.

Building the pHash library on Windows

By : JT-QT
Date : March 29 2020, 07:55 AM
hope this fix your issue Except for some dirent functions, no pHash functions are exported from pHash.dll. That can be verified with DependencyWalker http://www.dependencywalker.com/. Try adding __declspec(dllexport) in front of the function declarations in pHash.h (e.g. for ph_dct_imagehash) and recompile.

undefined reference to function in shared library created directly from static library

By : Dan T
Date : March 29 2020, 07:55 AM
To fix this issue I have figured it out. My feeling was correct -- it is a stupid mistake:
The declaration of the sim() function in main.c needs to be put into a extern "C" block, since I am using g++ as the compiler.
code :
extern "C" {
  extern uint64_t sim(uint64_t *a1, uint64_t *a2, uint64_t *a3, uint64_t len);
int main(int argc, char **argv)
  ... // preparing a1, a2, a3, len
  uint64_t act_sum = sim(a1, a2, a3, len);
extern "C" uint64_t sim(uint64_t *a1, uint64_t *a2, uint64_t *a3, uint64_t len);

Error installing pHash on Ubuntu

By : Ramesh
Date : March 29 2020, 07:55 AM
With these it helps It looks that the library pHash is not maintained anymore. However, if it is needed for some quick solution using the library functionality it can be installed on compatible Linux version. In that case it is possible to set up some virtual server instance.
The library is too new for Ubuntu 10.04, since it uses functions introduced in 2011-2013.
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