मूल रूप से, आप findContours
समारोह संयोजन में कई अन्य कार्यों OpenCV विशेष रूप से इस उद्देश्य के लिए प्रदान करता है के साथ उपयोग करते हैं,।
उदाहरण कोड (मैं से सभी गुण मैटलैब का regionprops
WeightedCentroid
और EulerNumber
को छोड़कर है - आप बाहर EulerNumber
findContours
में cv2.RETR_TREE
का उपयोग कर और जिसके परिणामस्वरूप पदानुक्रम को देखकर काम कर सकता था , और मुझे यकीन है कि WeightedCentroid
या तो मुश्किल नहीं होगा।
# grab contours
cs,_ = cv2.findContours(BW.astype('uint8'), mode=cv2.RETR_LIST,
method=cv2.CHAIN_APPROX_SIMPLE)
# set up the 'FilledImage' bit of regionprops.
filledI = np.zeros(BW.shape[0:2]).astype('uint8')
# set up the 'ConvexImage' bit of regionprops.
convexI = np.zeros(BW.shape[0:2]).astype('uint8')
# for each contour c in cs:
# will demonstrate with cs[0] but you could use a loop.
i=0
c = cs[i]
# calculate some things useful later:
m = cv2.moments(c)
# ** regionprops **
Area = m['m00']
Perimeter = cv2.arcLength(c,True)
# bounding box: x,y,width,height
BoundingBox = cv2.boundingRect(c)
# centroid = m10/m00, m01/m00 (x,y)
Centroid = (m['m10']/m['m00'],m['m01']/m['m00'])
# EquivDiameter: diameter of circle with same area as region
EquivDiameter = np.sqrt(4*Area/np.pi)
# Extent: ratio of area of region to area of bounding box
Extent = Area/(BoundingBox[2]*BoundingBox[3])
# FilledImage: draw the region on in white
cv2.drawContours(filledI, cs, i, color=255, thickness=-1)
# calculate indices of that region..
regionMask = (filledI==255)
# FilledArea: number of pixels filled in FilledImage
FilledArea = np.sum(regionMask)
# PixelIdxList : indices of region.
# (np.array of xvals, np.array of yvals)
PixelIdxList = regionMask.nonzero()
# CONVEX HULL stuff
# convex hull vertices
ConvexHull = cv2.convexHull(c)
ConvexArea = cv2.contourArea(ConvexHull)
# Solidity := Area/ConvexArea
Solidity = Area/ConvexArea
# convexImage -- draw on convexI
cv2.drawContours(convexI, [ConvexHull], -1,
color=255, thickness=-1)
# ELLIPSE - determine best-fitting ellipse.
centre,axes,angle = cv2.fitEllipse(c)
MAJ = np.argmax(axes) # this is MAJor axis, 1 or 0
MIN = 1-MAJ # 0 or 1, minor axis
# Note: axes length is 2*radius in that dimension
MajorAxisLength = axes[MAJ]
MinorAxisLength = axes[MIN]
Eccentricity = np.sqrt(1-(axes[MIN]/axes[MAJ])**2)
Orientation = angle
EllipseCentre = centre # x,y
# ** if an image is supplied with the BW:
# Max/Min Intensity (only meaningful for a one-channel img..)
MaxIntensity = np.max(img[regionMask])
MinIntensity = np.min(img[regionMask])
# Mean Intensity
MeanIntensity = np.mean(img[regionMask],axis=0)
# pixel values
PixelValues = img[regionMask]
स्रोत
2012-01-30 05:14:26
कीवर्ड "क्षेत्रप्रॉप" के लिए +1 जो मुझे – Tarrasch