Develop Reference

OpenCV Error: Bad argument in ERClassifierNM1

I run opencv 3.2.0, ubuntu 14.04, and latest opencv_contrib.
I run examine:
https://github.com/opencv/opencv_contrib/blob/master/modules/text/samples/textdetection.py
But it have show err:
$ python textdetection.py scenetext_word01.jpg
textdetection.py
A demo script of the Extremal Region Filter algorithm described in:
Neumann L., Matas J.: Real-Time Scene Text Localization and Recognition, CVPR 2012
Extracting Class Specific Extremal Regions from 9 channels ...
(...) this may take a while (...)
OpenCV Error: Bad argument (Default classifier file not found!) in ERClassifierNM1, file /home/vietnam/opencv_and_contri/opencv_contrib/modules/text/src/erfilter.cpp, line 1022
Traceback (most recent call last):
File "textdetection.py", line 38, in <module>
erc1 = cv2.text.loadClassifierNM1(pathname+'/trained_classifierNM1.xml')
cv2.error: /home/vietnam/opencv_and_contri/opencv_contrib/modules/text/src/erfilter.cpp:1022: error: (-5) Default classifier file not found! in function ERClassifierNM1
How to solve this?

Try using relative paths in the parameters for cv2.text.loadClassifierNM1() and cv2.text.loadClassifierNM2()
So now that part of the code looks like this:
erc1 = cv2.text.loadClassifierNM1('./trained_classifierNM1.xml')
er1 = cv2.text.createERFilterNM1(erc1,16,0.00015,0.13,0.2,True,0.1)
erc2 = cv2.text.loadClassifierNM2('./trained_classifierNM2.xml')
er2 = cv2.text.createERFilterNM2(erc2,0.5)
I'm not sure why this works (it did for me), but I tried this after looking at a solution posted for a similar problem in VS2015 here: https://github.com/cesardelgadof/OpenCVBinaries/issues/1
Hope this helps.

Trying with absolute path e.g. "/usr/lib/opencv-3.2.0/opencv_contrib-3.2.0/modules/text/samples/trained_classifierNM1.xml" worked in my case for Ubuntu 16.04, C++

Django - AttributeError _committed

I have a form that saves an image, and everything is working fine, but I want to be able to crop the image. However, when I used Pillow to do this, I get a strange error that doesn't really give me much to go on.
Attribute error at /userprofile/addGame/
_committed
Looking further into the traceback, the following sections were highlighted:
I'm not really sure what this error means. I think it has something to do with the form.save(committed=False), and not being able to edit files after that point, but I'm not positive. I can edit the user after that line using form.user = request.user, so I think it's the fact that I'm trying to change the image getting uploaded that is part of the issue.

This is an old post but I recently experienced a similar problem.
The information in the question is somewhat incomplete but I had the same error.
Assuming the Error being
File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/PIL/Image.py", line 627, in __getattr__
raise AttributeError(name)
AttributeError: _committed
So the root problem lies with using PIL (Pillow). The function :
image = Image.open(self.cleaned_data['image'])
We wrongly assume that the object image would continue to have the
instance of image throughout the function(clean_image in my case).
So in my code structure,
def clean_image(self):
if self.cleaned_data['image']:
try:
image = Image.open(self.cleaned_data['image'])
image.verify()
except IOError:
raise forms.ValidationError(_('The file is not an image'))
return image
The error mentioned above is thrown after we execute this code. It is so because
After several of the other PIL(pillow) functions we use, we need to
open the file again. Check this out in pillow documentation
As in the code above(last line),
return image
doesn't really return anything.
To fix it
Simply add ,
image = self.cleaned_data['image']
before the return image line.
Code looks like,
except IOError:
raise forms.ValidationError(_('The file is not an image'))
image = self.cleaned_data['image']
return image

I had faced the same issue trying to save a model with an ImageFileField. My requirement was to save an image from a zip object.
Using pillow gave me the AttributeError: _committed error. Following is what worked for me:
from django.core.files.images import ImageFile
zf = zipfile.ZipFile(zip_file, mode='r')
image_list = zf.infolist()
Model.objects.create(img=ImageFile(zipObj.open(image_list[0])),
file_name=image_list[0].filename.split("/")[-1].strip(),
...)

opencv 3.0.0-dev python bindings not working properly

I am on ubuntu 14.04.02, i have python, cython and numpy installed and updated.
i pulled the latest sources of open cv from http://github.com/itseez/opencv, compiled according to the documentation...
when trying to run the python source i pulled from https://github.com/shantnu/FaceDetect/
it's giving me the following error :
modprobe: FATAL: Module nvidia not found.
Traceback (most recent call last):
File "face_detect.py", line 21, in
flags = cv2.cv.CV_HAAR_SCALE_IMAGE
AttributeError: 'module' object has no attribute 'cv'
to make sure i have the python bindings i typed the following in the terminal:
python
import cv2
cv2.__version__
it returned the following
'3.0.0-dev'
what could be wrong with it?

the cv2.cv submodule got removed in opencv3.0, also some constants were changed.
please use cv2.CASCADE_SCALE_IMAGE instead
(do a help(cv2) to see the updated constants)

Apologies for the bump, but the above did not work for me, and I found an alternate "solution", but it may have unwanted side effects, given I know SFA about openCV.
The simple solution is just set it to 0.
# Detect faces in the image
faces = faceCascade.detectMultiScale(
gray,
scaleFactor=1.1,
minNeighbors=5,
minSize=(30, 30),
# flags = cv2.cv.CV_HAAR_SCALE_IMAGE
flags = 0
)
As you can see... i just set it to 0 and could move on with my life.
I tried all number of combinations, and I couldn't get the CASCADE_SCALE_IMAGE working.
This openCV doco explaination gives me nadda, zip, nothing but confusion.
flags – Parameter with the same meaning for an old cascade as in the function cvHaarDetectObjects. It is not used for a new cascade.
That cleared it up...
Anyway, the example on openCV hard codes it to 0.

opencv getImage() error

I wrapped opencv today with simplecv python interface. After going through the official SimpleCV Cookbook I was able to successfully Load, Save, and Manipulate images. Thus, I know the library is being loaded properly.
However, under the Using a Camera, Kinect, or Virtual Camera heading I was unsuccessful in running some commands. In particular, mycam = Camera() worked, but img = mycam.getImage() produced the following error:
In [35]: img = mycam.getImage().save()
OpenCV Error: Bad argument (Array should be CvMat or IplImage) in cvGetSize, file /home/jordan/OpenCV-2.2.0/modules/core/src/array.cpp, line 1237
---------------------------------------------------------------------------
error Traceback (most recent call last)
/home/simplecv/<ipython console> in <module>()
/usr/local/lib/python2.7/dist-packages/SimpleCV-1.1-py2.7.egg/SimpleCV/Camera.pyc in getImage(self)
332
333 frame = cv.RetrieveFrame(self.capture)
--> 334 newimg = cv.CreateImage(cv.GetSize(frame), cv.IPL_DEPTH_8U, 3)
335 cv.Copy(frame, newimg)
336 return Image(newimg, self)
error: Array should be CvMat or IplImage
I'm running Ubuntu Natty on a HP TX2500 tablet. It has a built in webcam, (CyberLink Youcam?) Has anybody seen this error before? I've been all over the web today looking for a solution, but nothing seems to be doing the trick.
Update 1: I tested cv.QueryFrame(capture) using the code found here in a separate Stack Overflow question and it worked; so I've pretty much nailed this down to a webcam issue.
Update 2: In fact, I get the exact same errors on a machine that doesn't even have a webcam! It's looking like the TX2500 is not compatible...

since the error raised from Camera.py of SimpleCV, you need to debug the getImage() method. If you can edit it:
def getImage(self):
if (not self.threaded):
cv.GrabFrame(self.capture)
frame = cv.RetrieveFrame(self.capture)
import pdb # <-- add this line
pdb.set_trace() # <-- add this line
newimg = cv.CreateImage(cv.GetSize(frame), cv.IPL_DEPTH_8U, 3)
cv.Copy(frame, newimg)
return Image(newimg, self)
then run your program, it will be paused as pdb.set_trace(), here you can inspect the type of frame, and try to figure out how get the size of frame.
Or you can do the capture in your code, and inspect the frame object:
mycam = Camera()
cv.GrabFrame(mycam.capture)
frame = cv.RetrieveFrame(mycam.capture)

To answer my own question...
I bought a Logitech C210 today and the problem disappeared.
I'm now getting warnings:
Corrupt JPEG data: X extraneous bytes before marker 0xYY.
However, I am able to successfully push a video stream to my web-browser via JpegStreamer(). If I cannot solve this error, I'll open a new thread.
Thus, for now, I'll blame the TX2500.
If anybody finds a fix in the future, please post.
Props to #HYRY for the investigation. Thanks.

I'm geting the camera with OpenCV
from opencv import cv
from opencv import highgui
from opencv import adaptors
def get_image()
cam = highgui.cvCreateCameraCapture(0)
im = highgui.cvQueryFrame(cam)
# Add the line below if you need it (Ubuntu 8.04+)
#im = opencv.cvGetMat(im)
return im

Anthony, one of the SimpleCV developers here.
Also instead of using image.save(), this function writes the file/video to disk, you instead probably want to use image.show(). You can save if you want, but you need to specify a file path like image.save("/tmp/blah.png")
So you want to do:
img = mycam.getImage()
img.show()
As for that model of camera I'm not sure if it works or not. I should note that we also wrapper different camera classes not just OpenCV, this is because OpenCV has a problem with webcams over 640x480, we now can do high resolution cameras.

Also I should mention, which I didn't realize, is that OpenCV less than 2.3 is broken with webcams on Ubuntu 11.04 and up. I didn't realize this as I was running Ubuntu 10.10 before, by the looks of your output you are using python 2.7 which makes me think you are on Ubuntu 11.04 or higher. Anyway, we have a fix for this problem. It is now pushed up into the master, it basically does a check to see if OpenCV is working, if not it will fall back to pygame.
This fix will also be in the 1.2 release of SimpleCV (It's in the master branch now)

Error using cv.CreateHist in Python OpenCV as well as strange absence of certain cv attributes

I am getting an error (see below) when trying to use cv.CreateHist in Python. I
am also noticing another alarming problem. If I spit out all of the attributes
of the cv module into a file, and then I search them, I find that a ton of
common things are missing.
For example, cv.TermCriteria() is not there; cv.ConnectedComp is not there; and
cv.CvRect is not there.
Everything about my installation, with Open CV 2.2, worked just fine. I can plot
images, make CvScalars, and call plenty of the functions, like cv.CamShift...
but there are a dozen or so of these hit-or-miss functions or data structures
that are simply missing with no explanation.
Here's my code for cv.CreateHist:
import cv
q = cv.CreateHist([1],1,cv.CV_HIST_ARRAY)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: x9y��
The weird wingding stuff is actually what it spits out at the command line, not a copy-paste error. Can anyone help figure this out? It's incredibly puzzling.
Ely

As for CvRect, see the documentation. It says such types are represented as Pythonic tuples.
As for your call to CreateHist, you may be passing the arguments in wrong order. See createhist in the docs for python opencv.