Error

[mrnugget]

Error

[mrnugget]

It is a one line command, yes. But you posted it with multiple lines, like the way I did in the README of this repo. But: I put backslashes at the end of each line, so that the shell will interpret the multiple lines as one.

You can run it as a single line:

perl bin/createsamples.pl positives.txt negatives.txt samples 1700 "opencv_createsamples -bgcolor 0 -bgthresh 0 -maxxangle 1.1 -maxyangle 1.1 maxzangle 0.5 -maxidev 40 -w 24 -h 24"

I think I made an error while transcribing the command too: maxzangle 0.5 should probably be -maxzangle 0.5

[mrnugget]

Did your forget the \ at the end of each line?

[pradeepktg]

@mrnugget
is this not a one line command ? I tried with \ as you suggested, this time no error and no sample is created

[pradeepktg]

@mrnugget I tried in many ways, with slash and without slash, there is no error but no sample are created in the sample folder. Can you tell me what will be there in the samples folder once the command is success and how long will it take to create samples ?

FYI - I have only 31 images each in positive_images and negative_images.
Step1 was not completely success, but i have downloaded opencv 2.4.9 framework

[mrnugget]

So the command works now without an error?

Do you have the paths to your samples in positives.txt and negatives.txt?

[pradeepktg]

Yes command works without any error and i have both positives.txt and negatives.txt files and these two files are inside the root folder

[mrnugget]

Okay, sounds good. But do those two files contain anything at all?

[pradeepktg]

Yes, it has the image paths, like, ./negative_images/imagename.jpeg
./positive_images/imagename.jpeg. I have just 31 images each for positive and negative, do you this is causing the issue ? as i said in my previous comments , step1 in your instruction is not completely success

Install OpenCV & get OpenCV source

brew tap homebrew/science
brew install --with-tbb opencv
wget http://downloads.sourceforge.net/project/opencvlibrary/opencv-unix/2.4.9/opencv-2.4.9.zip
unzip opencv-2.4.9.zip

[mrnugget]

Which of the four commands didn't succeed?

[pradeepktg]

This one - wget http://downloads.sourceforge.net/project/opencvlibrary/opencv-unix/2.4.9/opencv-2.4.9.zip. I'm trying to execute the step1, and it's going well i think, it's in ==>installing opencv
==>downloading https://github.com/Itseez/opencv/archive/2.4.9.tar.gz stage
Do you think this caused the issue ?

[mrnugget]

What does "it's in ==>installing opencv ==>downloading https://github.com/Itseez/opencv/archive/2.4.9.tar.gz stage" mean? wget should not output anything that has to do with "installing".

[pradeepktg]

I executed this command "brew install --without-tbb opencv" and it's installing everything, now the progress is in installing opencv

[mrnugget]

Okay, that sounds like it works. Or is it stuck somewhere? Compiling opencv might take some time.

[pradeepktg]

It was stuck yesterday and the installing was failed. I'll complete the step 1, try to create sample again , and let you know the result. Thanks for your kind help, really appreciate it.

[mrnugget]

Alright! I'll close this issue then, since the error you got from the command seems to be "fixed".

[pradeepktg]

@mrnugget when i compile this code
g++ pkg-config --libs --cflags opencv | sed 's/libtbb\.dylib/tbb/'
-I. -o mergevec mergevec.cpp
cvboost.cpp cvcommon.cpp cvsamples.cpp cvhaarclassifier.cpp
cvhaartraining.cpp
-lopencv_core -lopencv_calib3d -lopencv_imgproc -lopencv_highgui -lopencv_objdetect

I get this error

Package opencv was not found in the pkg-config search path.
Perhaps you should add the directory containing `opencv.pc'
to the PKG_CONFIG_PATH environment variable
No package 'opencv' found
clang: error: no such file or directory: 'mergevec'
clang: error: no such file or directory: ' -lopencv_core'

[mrnugget]

What does this return?

brew info opencv

And what does this return?

pkg-config --libs --cflags opencv

[pradeepktg]

brew info opencv returned

opencv: stable 2.4.9, HEAD
http://opencv.org/
/usr/local/Cellar/opencv/2.4.9 (219 files, 38M) *
Built from source
From: https://github.com/homebrew/homebrew-science/blob/master/opencv.rb
==> Dependencies
Build: cmake ✔, pkg-config ✔
Required: jpeg ✔, libpng ✔, libtiff ✔
Recommended: eigen ✔, openexr ✔
Optional: gstreamer ✘, jasper ✘, libdc1394 ✘, openni ✘, qt ✘, tbb ✘, ffmpeg ✘
==> Options
--32-bit
Build 32-bit only
--c++11
Build using C++11 mode
--with-cuda
Build with CUDA support
--with-ffmpeg
Build with ffmpeg support
--with-gstreamer
Build with gstreamer support
--with-jasper
Build with jasper support
--with-java
Build with Java support
--with-libdc1394
Build with libdc1394 support
--with-openni
Build with openni support
--with-qt
Build the Qt4 backend to HighGUI
--with-quicktime
Use QuickTime for Video I/O insted of QTKit
--with-tbb
Enable parallel code in OpenCV using Intel TBB
--with-tests
Build with accuracy & performance tests
--without-eigen
Build without eigen support
--without-opencl
Disable GPU code in OpenCV using OpenCL
--without-openexr
Build without openexr support
--HEAD
install HEAD version
==> Caveats
If you need Python to find the installed site-packages:
mkdir -p ~/Library/Python/2.7/lib/python/site-packages
echo '/usr/local/lib/python2.7/site-packages' > ~/Library/Python/2.7/lib/python/site-packages/homebrew.pth

and pkg-config --libs --cflags opencv returned

Package opencv was not found in the pkg-config search path.
Perhaps you should add the directory containing `opencv.pc'
to the PKG_CONFIG_PATH environment variable
No package 'opencv' found

[mrnugget]

What does this return?

which pkg-config

And this?

brew ls opencv

[pradeepktg]

which pkg-config returned
/opt/local/bin/pkg-config

brew ls opencv returned
/usr/local/Cellar/opencv/2.4.9/bin/opencv_createsamples
/usr/local/Cellar/opencv/2.4.9/bin/opencv_haartraining
/usr/local/Cellar/opencv/2.4.9/bin/opencv_performance
/usr/local/Cellar/opencv/2.4.9/bin/opencv_traincascade
/usr/local/Cellar/opencv/2.4.9/include/opencv/ (11 files)
/usr/local/Cellar/opencv/2.4.9/include/opencv2/ (150 files)
/usr/local/Cellar/opencv/2.4.9/lib/libopencv_calib3d.2.4.9.dylib
/usr/local/Cellar/opencv/2.4.9/lib/libopencv_contrib.2.4.9.dylib
/usr/local/Cellar/opencv/2.4.9/lib/libopencv_core.2.4.9.dylib
/usr/local/Cellar/opencv/2.4.9/lib/libopencv_features2d.2.4.9.dylib
/usr/local/Cellar/opencv/2.4.9/lib/libopencv_flann.2.4.9.dylib
/usr/local/Cellar/opencv/2.4.9/lib/libopencv_gpu.2.4.9.dylib
/usr/local/Cellar/opencv/2.4.9/lib/libopencv_highgui.2.4.9.dylib
/usr/local/Cellar/opencv/2.4.9/lib/libopencv_imgproc.2.4.9.dylib
/usr/local/Cellar/opencv/2.4.9/lib/libopencv_legacy.2.4.9.dylib
/usr/local/Cellar/opencv/2.4.9/lib/libopencv_ml.2.4.9.dylib
/usr/local/Cellar/opencv/2.4.9/lib/libopencv_nonfree.2.4.9.dylib
/usr/local/Cellar/opencv/2.4.9/lib/libopencv_objdetect.2.4.9.dylib
/usr/local/Cellar/opencv/2.4.9/lib/libopencv_ocl.2.4.9.dylib
/usr/local/Cellar/opencv/2.4.9/lib/libopencv_photo.2.4.9.dylib
/usr/local/Cellar/opencv/2.4.9/lib/libopencv_stitching.2.4.9.dylib
/usr/local/Cellar/opencv/2.4.9/lib/libopencv_superres.2.4.9.dylib
/usr/local/Cellar/opencv/2.4.9/lib/libopencv_video.2.4.9.dylib
/usr/local/Cellar/opencv/2.4.9/lib/libopencv_videostab.2.4.9.dylib
/usr/local/Cellar/opencv/2.4.9/lib/pkgconfig/opencv.pc
/usr/local/Cellar/opencv/2.4.9/lib/python2.7/ (2 files)
/usr/local/Cellar/opencv/2.4.9/lib/ (37 other files)
/usr/local/Cellar/opencv/2.4.9/share/OpenCV/ (29 files)

[mrnugget]

Seems like all the necessary files are there for pkg-config to work with opencv. But the path for pkg-config seems to be off.

Did you install homebrew to /opt/local? What does brew --prefix return?

[pradeepktg]

I'm not sure where i installed :(

brew --prefix returned

/usr/local

[mrnugget]

It seems like homebrew is installed to /usr/local but your $PATH contains /opt/local before /usr/local/bin. You need to change your $PATH variable, so it's the other way around and which pkg-config returns /usr/local/bin/pkg-config.

[pradeepktg]

ok, should i uninstall homebrew completely and install again or is there any way to change the $PATH to /usr/local/bin ?

[mrnugget]

No, you don't need to reinstall homebrew. Setting $PATH is pretty common and you should easily find how to do it on your system. See this google search.

[pradeepktg]

After a complete mess, i finally set the $PATH. Now which pkg-config returns "/usr/local/bin/pkg-config"
But i have another issue, When i run the following command
perl bin/createsamples.pl positives.txt negatives.txt samples 1500
"opencv_createsamples -bgcolor 0 -bgthresh 0 -maxxangle 1.1
-maxyangle 1.1 maxzangle 0.5 -maxidev 40 -w 80 -h 40"

i get some syntax error
opencv_createsamples -bgcolor 0 -bgthresh 0 -maxangle 1.1 -maxyangle 1.1 -maxzangle 0.5 -maxidev 40 -w 40 -h 40 -img ./positive_images/images (7).jpeg -bg tmp -vec samples/images (7).jpeg.vec -num 1
sh: -c: line 0: syntax error near unexpected token `('

[pradeepktg]

ok, Now i fixed the above error by leaving space between each image file in the neg and pos images folder. below command is also success

cp src/mergevec.cpp ~/opencv-2.4.9/apps/haartraining
cd ~/opencv-2.4.9/apps/haartraining
g++ pkg-config --libs --cflags opencv | sed 's/libtbb\.dylib/tbb/'
-I. -o mergevec mergevec.cpp
cvboost.cpp cvcommon.cpp cvsamples.cpp cvhaarclassifier.cpp
cvhaartraining.cpp
-lopencv_core -lopencv_calib3d -lopencv_imgproc -lopencv_highgui -lopencv_objdetect

after this, i switched to the root folder , that is , opencv-haar-classifier-training-master and i ran the below two commands
find ./samples -name '*.vec'>samples.txt -->This is success
./mergevec samples.txt samples.vec --> gives "-bash: ./mergevec: No such file or directory"

If i don't switch to root folder and run this command ;

find ./samples -name '*.vec'>samples.txt -->find: ./samples: No such file or directory

[mrnugget]

Yep, you need to copy/move the mergevec executable to the root folder.

[pradeepktg]

finally in training cascade stage, does it really take such a long time ? I have 30 positive images and 15 negative images and used below code

opencv-haar-classifier-training-master pradeepchandrasekaran$ opencv_traincascade -data classifier -vec samples.vec -bg negatives.txt -numStages 20 -minHitRate 0.999 -maxFalseAlarmRate 0.5 -numPos 9 -numNeg 3 -w 30 -h 30 -mode ALL -precalcValBufSize 1024 -precalcIdxBufSize 1024

first 13 stages are very fast, but next stage is taking too long, almost 3 hours , is it normal or am i doing s'thing wrong ? The reason why i used -numPos 9 -numNeg 3 eventhough i have 30 & 15 respectively , is that i have seen the calculation in some post. Could you please tell me how much images you had in each category and how long did it take for you to complete the training ?

[mrnugget]

As I wrote in my original blogpost it took several days for my training process to finish (the number of samples is mentioned there as well)

[pradeepktg]

ok, Thank you so much for helping @mrnugget 👍 Really appreciate your quick response. All the best

[mrnugget]

👍 👍 👍

[pradeepktg]

@mrnugget probably i need one more help from you. I had set 15 stages and it was completed. When i run the final command , i named the xml as smilingface.xml, i couldn't see this xml anywhere and i'm getting error

./facedetect --cascade="~/smilingface.xml"

This program demonstrates the cascade recognizer. Now you can use Haar or LBP features.
This classifier can recognize many kinds of rigid objects, once the appropriate classifier is trained.
It's most known use is for faces.
Usage:
./facedetect [--cascade=<cascade_path> this is the primary trained classifier such as frontal face]
[--nested-cascade[=nested_cascade_path this an optional secondary classifier such as eyes]]
[--scale=<image scale greater or equal to 1, try 1.3 for example>]
[--try-flip]
[filename|camera_index]

see facedetect.cmd for one call:
./facedetect --cascade="../../data/haarcascades/haarcascade_frontalface_alt.xml" --nested-cascade="../../data/haarcascades/haarcascade_eye.xml" --scale=1.3

During execution:
Hit any key to quit.
Using OpenCV version 2.4.9

Processing 1 --cascade=~/smilingface.xml
from which we have cascadeName= ~/smilingface.xml
ERROR: Could not load classifier cascade

[mrnugget]

It didn't produce a file? Weird.

If it has, try running it without putting the filename in quotes or without
using "~/" (use absolute path instead)

On Monday, November 17, 2014, pradeepktg [email protected] wrote:

@mrnugget https://github.com/mrnugget probably i need one more help
from you. I had set 15 stages and it was completed. When i run the final
command , i named the xml as smilingface.xml, i couldn't see this xml
anywhere and i'm getting error

./facedetect --cascade="~/smilingface.xml"

This program demonstrates the cascade recognizer. Now you can use Haar or
LBP features.
This classifier can recognize many kinds of rigid objects, once the
appropriate classifier is trained.
It's most known use is for faces.
Usage:
./facedetect [--cascade= this is the primary trained classifier such as
frontal face]
[--nested-cascade[=nested_cascade_path this an optional secondary
classifier such as eyes]]
[--scale=]
[--try-flip]
[filename|camera_index]

see facedetect.cmd for one call:
./facedetect
--cascade="../../data/haarcascades/haarcascade_frontalface_alt.xml"
--nested-cascade="../../data/haarcascades/haarcascade_eye.xml" --scale=1.3

During execution:
Hit any key to quit.
Using OpenCV version 2.4.9

Processing 1 --cascade=~/smilingface.xml
from which we have cascadeName= ~/smilingface.xml
ERROR: Could not load classifier cascade

—
Reply to this email directly or view it on GitHub
#4 (comment)
.

[pradeepktg]

nope, no success, i tried without quotes and without ~/. Below is the error

./facedetect --cascade= ~/smilingface.xml

This program demonstrates the cascade recognizer. Now you can use Haar or LBP features.
This classifier can recognize many kinds of rigid objects, once the appropriate classifier is trained.
It's most known use is for faces.
Usage:
./facedetect [--cascade=<cascade_path> this is the primary trained classifier such as frontal face]
[--nested-cascade[=nested_cascade_path this an optional secondary classifier such as eyes]]
[--scale=<image scale greater or equal to 1, try 1.3 for example>]
[--try-flip]
[filename|camera_index]

see facedetect.cmd for one call:
./facedetect --cascade="../../data/haarcascades/haarcascade_frontalface_alt.xml" --nested-cascade="../../data/haarcascades/haarcascade_eye.xml" --scale=1.3

During execution:
Hit any key to quit.
Using OpenCV version 2.4.9

Processing 1 --cascade=
from which we have cascadeName=
Processing 2 /Users/pradeepchandrasekaran/smilingface.xml
OpenCV Error: Null pointer (NULL or empty buffer) in cvOpenFileStorage, file /tmp/opencv-4KWvU5/opencv-2.4.9/modules/core/src/persistence.cpp, line 2697
libc++abi.dylib: terminating with uncaught exception of type cv::Exception: /tmp/opencv-4KWvU5/opencv-2.4.9/modules/core/src/persistence.cpp:2697: error: (-27) NULL or empty buffer in function cvOpenFileStorage

Abort trap: 6

[mrnugget]

But the file exists?

On Tuesday, November 18, 2014, pradeepktg [email protected] wrote:

nope, no success, i tried without quotes and without ~/. Below is the error

./facedetect --cascade= ~/smilingface.xml

This program demonstrates the cascade recognizer. Now you can use Haar or
LBP features.
This classifier can recognize many kinds of rigid objects, once the
appropriate classifier is trained.
It's most known use is for faces.
Usage:
./facedetect [--cascade= this is the primary trained classifier such as
frontal face]
[--nested-cascade[=nested_cascade_path this an optional secondary
classifier such as eyes]]
[--scale=]
[--try-flip]
[filename|camera_index]

see facedetect.cmd for one call:
./facedetect
--cascade="../../data/haarcascades/haarcascade_frontalface_alt.xml"
--nested-cascade="../../data/haarcascades/haarcascade_eye.xml" --scale=1.3

During execution:
Hit any key to quit.
Using OpenCV version 2.4.9

Processing 1 --cascade=
from which we have cascadeName=
Processing 2 /Users/pradeepchandrasekaran/smilingface.xml
OpenCV Error: Null pointer (NULL or empty buffer) in cvOpenFileStorage,
file /tmp/opencv-4KWvU5/opencv-2.4.9/modules/core/src/persistence.cpp, line
2697
libc++abi.dylib: terminating with uncaught exception of type
cv::Exception:
/tmp/opencv-4KWvU5/opencv-2.4.9/modules/core/src/persistence.cpp:2697:
error: (-27) NULL or empty buffer in function cvOpenFileStorage

Abort trap: 6

—
Reply to this email directly or view it on GitHub
#4 (comment)
.

[pradeepktg]

Nope.the file is not there in the "classifier" folder

[mrnugget]

So there is nothing in your "classifier" directory? That would mean that the training didn't work. And I have no idea why that would be, sorry.

[pradeepktg]

I mean 14 stages xml files are there , but not the final xml (smilingface.xml), which is suppose to be generated after this ./facedetect --cascade= ~/smilingface.xml command

[mrnugget]

The XML file is not supposed to be generated by the facedetect command, no. It's supposed to be the result of the opencv_traincascade command. And there you specified -data cascade, which would not result in a smilingface.xml file.

Sorry, don't know more about that.

[pradeepktg]

ok, if i'm not wrong, cascade.xml in the "classifier" folder is the output/generated xml file ? if yes, then i think my training was successful and can i use cascade.xml file in my ios application without last command ?
cd /opencv-2.4.9/samples/c
chmod +x build_all.sh
./build_all.sh
./facedetect --cascade="/finished_classifier.xml"

[mrnugget]

Yes, exactly right: the "cascade.xml" file in the "classifier" folder is the final classifier file.

The last command is just there to try it out :) It uses the facedetect program that ships with OpenCV to try out the classifier.

[pradeepktg]

OMG. I have deleted all the xml files and restarted the training with 20 stages. Anyways, happy to read the cascade.xml is the final output :) Thank you again so much 👍 👍 After this it's my headache to detect the objects i'm intended to

Danke

[mrnugget]

Oh! Sorry to hear! Well, good luck then with the new process! 👍

[pradeepktg]

Danke

[sunaina123]

please help me to solve my error....... I have run the createsamples command but my info folder is empty.