Houghlines in android with opencv -

-

i trying make perspective correction quadrilateral objects using opencv3. managed show lines , implemented houghlines using imgproc.houghlinesp() , tried highlight lines using imgproc.lines() output no success. below code , have attached output image.

please let me know wrong happening , should done...

mat initimg; // initial image mat greyimg; // converted grey  mat lines = new mat(); int threshold = 50; int minlinesize = 20; int linegap = 10;  initimg = imgcodecs.imread(imgloc, 1); greyimg = new mat(); imgproc.cvtcolor(initimg, greyimg, imgproc.color_bgr2gray); bitmap bitm = bitmap.createbitmap(greyimg.cols(), greyimg.rows(),bitmap.config.argb_8888);  imgproc.blur(greyimg, greyimg, new size(3.d, 3.d)); imgproc.adaptivethreshold(greyimg, greyimg, 255, imgproc.adaptive_thresh_mean_c, imgproc.thresh_binary_inv, 15, 4);  imgproc.houghlinesp(greyimg, lines, 1, math.pi/180, threshold,         minlinesize, linegap); // lines returns rows x columns , rows 1. dont know why please me understand (int x = 0; x < lines.cols(); x++) {      double[] vec = lines.get(0, x);     double[] val = new double[4];      double x1 = vec[0],             y1 = vec[1],             x2 = vec[2],             y2 = vec[3];      system.out.println(tag+"coordinates: x1=>"+x1+" y1=>"+y1+" x2=>"+x2+" y2=>"+y2);     point start = new point(x1, y1);     point end = new point(x2, y2);      imgproc.line(greyimg, start, end, new scalar(0,255, 0, 255), 3);  }  utils.mattobitmap(greyimg, bitm);  if(bitm!=null){     toast.maketext(getapplicationcontext(), "bitmap not null", toast.length_short).show();     iv.setimagebitmap(bitm); }else{     toast.maketext(getapplicationcontext(), "bitmap null", toast.length_short).show(); }

my output:

output above code

i managed houghlines. houghlines not showing in grey images , extracted houghlines in grey image plotted lines in color image , worked.

imgproc.houghlinesp(greyimg, lines, 1, math.pi/180, threshold,                 minlinesize, linegap);          (int x = 0; x < lines.rows(); x++)         {             double[] vec = lines.get(x, 0);             double x1 = vec[0],                     y1 = vec[1],                     x2 = vec[2],                     y2 = vec[3];             point start = new point(x1, y1);             point end = new point(x2, y2);             double dx = x1 - x2;             double dy = y1 - y2;              double dist = math.sqrt (dx*dx + dy*dy);              if(dist>300.d)  // show lines have length greater 300                 imgproc.line(initimg, start, end, new scalar(0,255, 0, 255),5);// here initimg original image.          }

Comments

Post a Comment

Popular posts from this blog

c# - Better 64-bit byte array hash -

-
i need hash algorithm produces 64-bit hash code ( long ) fewer collisions string.gethashcode() , fast (no expensive calls cryptographic functions). here's implementation of fnv still shows 3% of collisions after testing 2 million random strings. need number way lower. void main() { const string chars = "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz!#@$%^&*()_+}{\":?><,./;'[]0123456789\\"; const int n = 2000000; var random = new random(); var hashes = new hashset<long>(); int collisions = 0; for(int = 0; < n; i++) { var len = random.next(chars.length); var str = new char[len]; (int j = 0; j < len; j++) { str[j] = chars[random.next(chars.length)]; } var s = new string(str); if(!hashes.add(get64bithash( s ))) collisions++; } console.writeline("collision percentage after " + n + " random strings: " + ((doubl
Read more

webrtc - Which ICE candidate am I using and why? -

-
[questions in bold below] i have setup kurento media server 5.1.3 in datacenter behind firewall running os ubuntu 14.04. has 2 network cards: 222.222.222.222 (eth0 - private ip) 111.111.111.111 (eth1 - public ip) attached below sdp (setremotedescription) when browser connected kurento media server type: answer, sdp: v=0 o=- 5487318114793304426 0 in ip4 0.0.0.0 s=kurento media server c=in ip4 0.0.0.0 t=0 0 a=group:bundle audio video m=audio 59068 rtp/savpf 111 0 c=in ip4 111.111.111.111 a=rtpmap:111 opus/48000/2 a=rtpmap:0 pcmu/8000 a=sendrecv a=rtcp:59068 in ip4 111.111.111.111 a=rtcp-mux a=ssrc:669011897 cname:user39019747@host-6e83e4c2 a=extmap:3 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time a=mid:audio b=as:20 a=ice-ufrag:ymdk a=ice-pwd:lylifk5ueqzpwm91ddj37e a=fingerprint:sha-256 ff:0f:81:8c:41:4e:b4:b6:c6:d8:36:f3:d6:5f:09:fd:5f:af:13:b3:9d:fc:12:66:ac:f3:56:d6:5b:0a:73:5d a=candidate:1 1 udp 2013266431 111.111.111.111 55239 typ host a=candidate:2 1 udp
Read more

php - Zend Framework / Skeleton-Application / Composer install issue -

-
i trying create zend framework application using skeleton in netbeans. when run composer install, following error message: "c:\php\php.exe" "c:\composer\composer.phar" "--ansi" "--no-interaction" "update" "--dev" using deprecated option "dev". dev packages installed default now. loading composer repositories package information updating dependencies (including require-dev) requirements not resolved installable set of packages. problem 1 - package requires php >=5.5 php version (5.4.42) not satisfy requirement. problem 2 - installation request zendframework/zendframework 2.5.1 -> satisfiable zendframework/zendframework[2.5.1]. - zendframework/zendframework 2.5.1 requires php >=5.5 -> php version (5.4.42) not satisfy requirement. done. apparently, zend framework only needs php 5.3+ contradicts above. need use php 5.4. my composer.json following: { "name": "
Read more