c++ - Principle range of object orientation using image moments -


i trying extract angle of shape in image using moments in opencv/c++. able extract angle, issue principal range of angle 180 degrees. makes orientation of object ambiguous respect 180 degree rotations. code using extract angle is,

findcontours(frame, contours, cv_retr_external, cv_chain_approx_simple);  vector<vector<point2i> > hull(contours.size());  int maxarea = 0; int maxi = -1;  int m20 = 0; int m02 = 0; int m11 = 0;  (int = 0; < contours.size(); i++) {     convexhull(contours[i], hull[i], false);     approxpolydp(hull[i], contourvertices, arclength(hull[i], true)*0.1, true);     shapemoments = moments(hull[i], false);      if(shapemoments.m00 <= areathreshold || shapemoments.m00 >= max_area)         continue;      if(contourvertices.size() <= 3 || contourvertices.size() >= 7)         continue;      if(shapemoments.m00 >= maxarea)     {         maxarea = shapemoments.m00;         maxi = i;     } }  if(maxi == -1)     return false;  fabriccontour = hull[maxi];  approxpolydp(hull[maxi], contourvertices, arclength(hull[maxi], true)*0.02,true); shapemoments = moments(hull[maxi], false); centerofmass = point2f(shapemoments.m10/shapemoments.m00, shapemoments.m01/shapemoments.m00);  drawcontours(contourframe, hull, maxi, scalar(24, 35, 140), cv_filled, cv_aa); drawcontours(originalframe, hull, maxi, scalar(255, 0, 0), 8, cv_aa); circle(contourframe, centerofmass, 4, scalar(0, 0, 0), 10, 8, 0);  posx = centerofmass.x; posy = centerofmass.y; m11 = shapemoments.mu11/shapemoments.m00; m20 = shapemoments.mu20/shapemoments.m00; m02 = shapemoments.mu02/shapemoments.m00; num = double(2)*m11; den = m20 - m02; angle = (int(-1*(180/(2*m_pi))*atan2(num, den)) + 45 + 180)%180; //angle = int(-1*(180/(2*m_pi))*atan2(num, den));  area = shapemoments.m00;

is there way can remove ambiguity extracted angle? tries using third order moments, not seem reliable.


-

Comments

Post a Comment

Popular posts from this blog

OpenCV OpenCL: Convert Mat to Bitmap in JNI Layer for Android -

there several posts converting mat bitmap using utils.mattobitmap() function. i'm assuming function can called in java layer after importing utils class. i want transfer data memory address pointed uint32_t* bmpcontent; in code below. jniexport void jnicall java_com_nod_nodcv_nodcvactivity_runfilter( jnienv *env, jclass clazz, jobject outbmp, jbytearray indata, jint width, jint height, jint choice, jint filter) { int outsz = width*height; int insz = outsz + outsz/2; androidbitmapinfo bmpinfo; if (androidbitmap_getinfo(env, outbmp, &bmpinfo) < 0) { throwjavaexception(env,"gaussianblur","error retrieving bitmap meta data"); return; } if (bmpinfo.format != android_bitmap_format_rgba_8888) { throwjavaexception(env,"gaussianblur","expecting rgba_8888 format"); return; } uint32_t* bmpcontent; if (androidbitmap_lockpixels(env, outbmp,(void**)&bmpcontent)...
Read more

android - org.xmlpull.v1.XmlPullParserException: expected: START_TAG {http://schemas.xmlsoap.org/soap/envelope/}Envelope -

i trying hit soap api in application login purpose , getting above mentioned error , can 1 tell me going wrong , first time soap apis. here code hit soap :- vector<object> args = new vector<object>(); hashtable<string, object> hashtable = new hashtable<string, object>(); hashtable.put("email", "mss.siddhart28@gmail.com"); hashtable.put("password", "siddharth"); args.add(hashtable); soapserializationenvelope envelope = new soapserializationenvelope( soapenvelope.ver11); envelope.dotnet = true; envelope.xsd = soapserializationenvelope.xsd; envelope.enc = soapserializationenvelope.enc; (new marshalhashtable()).register(envelope); httptransportse androidhttptransport = new httptransportse( "http://tempuri.org/", 15000); androidhttptransport.debug = true; string result = ""; try { soapobject request = new soapobject("http:...
Read more

python - How to remove the Xframe Options header in django? -

i have made page has iframe . inside iframe want show multiple different links article facebook, or news, or youtube video or other possible url. but, due xframe header, unable so. referred following link: https://docs.djangoproject.com/en/1.8/ref/clickjacking/ , django xframeoptionsmiddleware (x-frame-options) - allow iframe client ip but didn't help. my settings.py file's middleware_classes is: middleware_classes = ( 'django.contrib.sessions.middleware.sessionmiddleware', 'django.middleware.common.commonmiddleware', 'django.middleware.csrf.csrfviewmiddleware', 'django.contrib.auth.middleware.authenticationmiddleware', 'django.contrib.auth.middleware.sessionauthenticationmiddleware', 'django.contrib.messages.middleware.messagemiddleware', 'django.middleware.clickjacking.xframeoptionsmiddleware', ) from http://django-secure.readthedocs.org/en/latest/middleware.html , found using ...
Read more