La Rosa's profile - activity

Hello everybody i need to know how can i use the cvblob with opencv and python means how to install configure and test it thanks in advance

I'm trying to draw line between 2 points but when i run the code i get this error:

SystemError: new style getargs format but argument is not a tuple

any help i'll be thankful

here is the part of code:

cv2.line(img, approx[0], approx[1],( 0, 0, 255),3)

okay thank you

thank you so much it works but could you tell me what is the difference ( i'm a little bit new in opencv)

can any body tell me whart is worng with this code cause when i run it i get no errors and yet no image is shown

from VideoCapture import Device

import cv2

import cv2.cv as cv

cam = Device(0)

cam.saveSnapshot('imageL.jpg')

fn = 'C:\Python276\imageL.jpg'

imageL = cv2.imread(fn,0)

cv2.imshow('Left',imageL)

if cv2.waitKey(1) & 0xFF == 27:

    cv.DestroyAllWindows()

hi guys i'm getting the import error mentioned in the topic when i run this code:

import cv2 as cv

def caliLeftCam():
   import sys, getopt
   from glob import glog

   args, img_mask = getopt.getopt(sys.argv[1:], '', ['save=', 'debug=', 'square_size='])
   args = dict(args)
   try: img_mask = img_mask[0]
   except: img_mask = '../cpp/img*.jpg'
   img_names = glob(img_mask)
   debug_dir = args.get('--debug')
   square_size = float(args.get('--square_size', 1.0))

   pattern_size = (7, 5)
   pattern_points = np.zeros( (np.prod(pattern_size), 3), np.float32 )
   pattern_points[:,:2] = np.indices(pattern_size).T.reshape(-1, 2)
   pattern_points *= square_size

   obj_points = []
   img_pointsL = []
   h, w = 0, 0
for fn in img_names:
    print "processing %s..." % fn,
    imgL = cv.imread(fn, 0)
    h, w = imgL.shape[:2]
    found, corners = cv.findChessboardCorners(imgL, pattern_size)
    if found:
        term = ( cv.TERM_CRITERIA_EPS + cv.TERM_CRITERIA_COUNT, 30, 0.1 )
        cv.cornerSubPix(imgL, corners, (5, 5), (-1, -1), term)
    if debug_dir:
        vis = cv.cvtColor(imgL, cv.COLOR_GRAY2BGR)
        cv.drawChessboardCorners(vis, pattern_size, corners, found)
        path, name, ext = splitfn(fn)
        cv.imwrite('%s/%s_chess.bmp' % (debug_dir, name), vis)
    if not found:
        print "chessboard not found"
        continue
    img_pointsL.append(corners.reshape(-1, 2))
    obj_points.append(pattern_points)

    print 'ok'

    rmsL, cameraL_matrix, dist_coefsL, rvecsL, tvecsL = cv.calibrateCamera(obj_points, img_pointsL, (w, h))
    print "RMSL:", rmsL
    print "Left camera matrix:\n", cameraL_matrix
    print "distortion coefficients: ", dist_coefsL.ravel()

    newcameramtxL, roi=cv.getOptimalNewCameraMatrix(cameraL_matrix,dist_coefsL,(w,h),1,(w,h))
    #undistort
    mapxL,mapyL = cv.initUndistortRectifyMap(cameraL_matrix,dist_coefsL,None,newcameramtxL,(w,h),5)
    dstL = cv.remap(imgL,mapxL,mapyL,cv.INTER_LINEAR)
    return cameraL_matrix, dist_coefsL
if __name__ == '__main__':


  Cam_Mat, Dis = caliLeftCam()
  print 'matrix=' , Cam_Mat
  print 'distorcoef=' , Dis

any one can help me thank's in advance

hi guys i am using the cv2.drawcontours function to draw contours on webcam stream i want to know how can i add a track-bar to precis which contours to draw based on the hierarchy parameter of the cv2.findcontours function here is the code

import cv2

import cv2.cv as cv

cv2.namedWindow("test")

vc = cv2.VideoCapture(2);

retVal, frame = vc.read();

while True:

if frame is not None:   

    imgray = cv2.cvtColor(frame,cv2.COLOR_BGR2GRAY)
    ret,thresh = cv2.threshold(imgray,127,255,0)
    contours, hierarchy = cv2.findContours(thresh,cv2.RETR_TREE,cv2.CHAIN_APPROX_SIMPLE)
    cv2.drawContours(frame, contours, -1, (0,255,0), 2)


    cv2.imshow("test", frame)

rval, frame = vc.read()


if cv2.waitKey(1) & 0xFF == 27:
    break

cv.DestroyAllWindows()

hi guys i want to use Opencv in order to detect objects in real-time using two webcams so that i'll be able to measure the distance between the cams and the objects. the problem is that i don't know from where should i start? and which algorithm is the best? any little help I'll be thankfull

yopiii :) , thank you sooooo much

it works but i'm getting the result in an matrix?!! is that ok?

Any help please!

i am wondering how can i calculate the distance between tow webcams(stereo vision) and an object in front of them using the disparity map?

ok ;) thank you

it's okay ,I've used the wrong image :p now All is done how can i get the distance from the disparity map

i'm getting this error: colors = cv.cvtColor(imgL, cv.COLOR_BGR2RGB) error: ......\src\opencv\modules\imgproc\src\color.cpp:3346: error: (-215) scn == 3 || scn == 4 :/ ?!!

okay i really appreciate,now it works,thank you now moving to the next step thank you again

ok,but still getting this error: ValueError: too many values to unpack in this line RL, Rr, PL, PR, Q = cv.stereoRectify(camera_matrixL,dist_coefsL, cameraR_matrix, dist_coefsR,(384,288), R, T) (and i'm so sorry if i am bothering you)

and how about the R1,R2,P1,P2,Q?

i am using cv2 but just (import cv2 as cv)

yes it is!

hi again, i tried to run the cv2.stereoRectify but i got this error:

Traceback (most recent call last): File "C:\opencv246\samples\python2\stereocalib.py", line 132, in <module> cv.stereoRectify(camera_matrixL, cameraR_matrix, dist_coefsL, dist_coefsR,(384,288), R, T, RL, Rr, PL, PR) error: ......\src\opencv\modules\imgproc\src\undistort.cpp:292: error: (-215) CV_IS_MAT(_distCoeffs) && (_distCoeffs->rows == 1 || _distCoeffs->cols == 1) && (_distCoeffs->rows_distCoeffs->cols == 4 || _distCoeffs->rows_distCoeffs->cols == 5 || _distCoeffs->rows*_distCoeffs->cols == 8) why?!

okay working on it thank you

ok,i did it and it works now thank you one more question please what will the next step be in order to be able to calculate the distance between the tow webcams and the object in front of them?

okay thank you so much (please if you can help me in cv.stereoCalibration, how to calculate R,T,F,E?i'll be thankful) waiting for your explanation tomorrow.

Sorry but i didn't understand you (i'm new in opencv and python) how can i create matrix?!

Hi guys

i'm trying to use the cv.CreateMat in a python code but when i run it i got this error:

AttributeError: 'module' object has no attribute 'createMat'!!!!!

Please can anybody help me! thank you