Python 如何使用FILLCONVERXPOLY从所有轮廓制作遮罩
我想用轮廓做个面具。 这里是前7排的一瞥Python 如何使用FILLCONVERXPOLY从所有轮廓制作遮罩,python,opencv,image-processing,mask,Python,Opencv,Image Processing,Mask,我想用轮廓做个面具。 这里是前7排的一瞥 >>> df contour.ID xrT yrT xlT ylT 1057 20 6259.2300 4620.7845 5670.1260 4651.4670 1058 20 6253.0935 4620.7845 5682.3990 4651.4670 1059 20 6253.0935
>>> df
contour.ID xrT yrT xlT ylT
1057 20 6259.2300 4620.7845 5670.1260 4651.4670
1058 20 6253.0935 4620.7845 5682.3990 4651.4670
1059 20 6253.0935 4633.0575 5694.6720 4657.6035
1060 20 6240.8205 4633.0575 5694.6720 4657.6035
1061 20 6228.5475 4645.3305 5700.8085 4669.8765
1062 20 6228.5475 4645.3305 5700.8085 4669.8765
1063 20 6216.2745 4645.3305 5713.0815 4669.8765
我可以用一个函数画出我关心的所有轮廓
def display_all_contours(img, df, grouping_var):
# display with matplotlib
# Create figure and axes
fig, ax = plt.subplots(1)
# Display the image
ax.imshow(img)
# split by contour
grouped_frame = df.groupby(grouping_var)
li = [grouped_frame.get_group(x) for x in grouped_frame.groups]
# for every contour
for i in range(len(li)):
poly = patches.Polygon(np.array([li[i].xrT, li[i].yrT]).T,
fill=False)
ax.add_patch(poly)
for i in range(len(li)):
poly = patches.Polygon(np.array([li[i].xlT, li[i].ylT]).T,
fill=False, color="white")
ax.add_patch(poly)
return("Displaying " + str(len(np.unique(df[grouping_var]))) + " contours.")
这是在具有我的图像形状的东西上绘制contorus的结果
mask = np.zeros((9373, 12273), dtype=np.uint8)
display_all_contours(mask, df, "contour.ID")
问题
现在,我想创建所有多边形的遮罩(在本例中为左侧)。因此,我创建了一个遮罩,并使用cv2.fillConvexPoly
mask = np.zeros((9373, 12273), dtype=np.uint8)
display_all_contours(mask, df, "contour.ID")
for poly in np.unique(df["contour.ID"]):
# subset
sub_df = df[df["contour.ID"] == poly]
# burn into the mask
# explicitly burn into the mask
mask = cv2.fillConvexPoly(mask, np.array(sub_df[["xlT", "ylT"]], 'int32'), 1)
出于某种原因,我不明白,这并没有产生我想要的结果
plt.imshow(掩码)
解决了这个问题,我实际上在寻找的函数是
fillPoly
mask = np.zeros((9373, 12273), dtype=np.uint8)
display_all_contours(mask, df, "contour.ID")
for poly in np.unique(df["contour.ID"]):
# subset
sub_df = df[df["contour.ID"] == poly]
# burn into the mask
# explicitly burn into the mask
mask = cv2.fillConvexPoly(mask, np.array(sub_df[["xlT", "ylT"]], 'int32'), 1)
更换此线路可解决此问题
# mind the np.array(..., "int32") is wrapped in [] because that's how fillPoly likes it
mask = cv2.fillPoly(mask, [np.array(sub_df[["xlT", "ylT"]], 'int32')], 1)