Databases
StackOverflow2013
Postsdbo
POHow can i know if a contour is open or closed in opencv?
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POHow can i know if a contour is open or closed in opencv?
    primarykey
    data
    text
    <p>How can i know if a contour taken from 'find contour' function is open or closed in opencv?</p> <p><strong>UPDATE</strong></p> <p>I tried to apply isContourConvex to this image: <a href="https://docs.google.com/file/d/0ByS6Z5WRz-h2RXdzVGtXUTlPSGc/edit?usp=sharing" rel="nofollow">https://docs.google.com/file/d/0ByS6Z5WRz-h2RXdzVGtXUTlPSGc/edit?usp=sharing</a></p> <p>i extractes contour with greatest area and return false. I change, maybe, contour extraction, dilating?</p> <pre><code>nomeimg = 'Riscalate2/JPEG/e (5).jpg' img = cv2.imread(nomeimg) gray = cv2.imread(nomeimg,0)#convert grayscale adn binarize element = cv2.getStructuringElement(cv2.MORPH_CROSS,(6,6)) graydilate = cv2.erode(gray, element) #imgbnbin cv2.imshow('image',graydilate) cv2.waitKey(0) ret,thresh = cv2.threshold(graydilate,127,255,cv2.THRESH_BINARY_INV) # binarize imgbnbin = thresh cv2.imshow('bn',thresh) cv2.waitKey() #element = cv2.getStructuringElement(cv2.MORPH_CROSS,(2,2)) #element = np.ones((11,11),'uint8') contours, hierarchy = cv2.findContours(imgbnbin, cv2.RETR_TREE ,cv2.CHAIN_APPROX_SIMPLE) print(len(contours)) # Take only biggest contour basing on area Areacontours = list() calcarea = 0.0 unicocnt = 0.0 for i in range (0, len(contours)): area = cv2.contourArea(contours[i]) #print("area") #print(area) if (area &gt; 90 ): #con 90 trova i segni e togli puntini if (calcarea&lt;area): calcarea = area unicocnt = contours[i] convex = cv2.isContourConvex(unicocnt) print("convex") print(convex) </code></pre>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USpostgres
    1. USpostgres
    plurals
    1. This table or related slice is empty.
    1. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POHow can i know if a contour is open or closed in opencv?
      1. This table or related slice is empty.
      1. VTDownMod
    2. VO
      singulars
      1. POHow can i know if a contour is open or closed in opencv?
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. POHow can i know if a contour is open or closed in opencv?
      1. This table or related slice is empty.
      1. VTUpMod
    1. COI think cvcontour is based on connected components thus they can't be open.
      singulars
      1. POHow can i know if a contour is open or closed in opencv?
      1. USWilliam
    2. COso i could never know if in my image i have a circle like 'O' or a "C"? Maybe basing on something else?
      singulars
      1. POHow can i know if a contour is open or closed in opencv?
      1. USpostgres
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload