填充以黑线标记的区域

Question

我正在尝试查找图像中黑线内包含的区域。

这是示例起始图像“photo.jpg”：

Sample starting image "photo.jpg"

我为此使用了 OpenCV 和 SimpleCV。

代码如下：

from SimpleCV import Camera, Display, Image, Color
import time
import cv2
import numpy as np

n_image = Image('photo.jpg')
n_image2 = n_image.crop(55, 72, 546, 276)  #Crop X,Y,W,H
n_image2.save('photo_2.jpg')
imagea = Image("photo_2.jpg")

greya = imagea.stretch(50).invert()  #50=Blackness level of Black
greya.show()
greya.save('photo_2-GREY.jpg')

im = cv2.imread('photo_2-GREY.jpg')
imgray = cv2.cvtColor(im,cv2.COLOR_BGR2GRAY)

ret,thresh = cv2.threshold(imgray,220,255,0)
contours, hierarchy = cv2.findContours(thresh,cv2.RETR_TREE,cv2.CHAIN_APPROX_SIMPLE)
largest_areas = sorted(contours, key=cv2.contourArea)
cv2.drawContours(im, [largest_areas[-2]], 0, (255,255,255,255), -1)

cv2.drawContours(im,contours,-1,(255,255,255),-1)
cv2.imshow('Image Window',im)
cv2.waitKey(0)
cv2.destroyAllWindows()
cv2.imwrite('photo_3.jpg',im)

n_image = Image('photo_3.jpg')
mask = n_image.colorDistance((127, 127, 127))

mask.show()
mask.save('mask.jpg')
time.sleep(3)

binarised = mask.binarize()
blobs = binarised.findBlobs()
blobs.show(width=3)
time.sleep(60)

individualareaofholes = blobs.area()
compositeareaofholes = sum(individualareaofholes)
orig_area = 132432
finalarea = (orig_area - compositeareaofholes)
res = round(((finalarea/orig_area)*100),0)

print "Area is %d" % res

这是用于面积计算的图像“mask.jpg”：

Generated image "mask.jpg"

观察： 1.“mask.jpg”中白色区域内的黑色斑块 2. 左下角白色部分带有“TAXI”字样

如何消除它们？ 我只是希望黑线内的所有内容都被吞噬，而在计算面积时不要考虑黑线外的所有内容。

Answer 1

我认为您使解决方案复杂化（我可能错了）。我试图修改您的代码并获得黑色边界内的区域。不确定该区域是否正确，但它会为您提供一种微调它的方法。

import cv2
import numpy as np

n_image = cv2.imread('5GZ6X.jpg') # Your original image

imgray =  cv2.cvtColor(n_image,cv2.COLOR_BGR2GRAY)
im_new = np.zeros_like(imgray)
ret,thresh = cv2.threshold(imgray,10,255,0)
contours, hierarchy = cv2.findContours(thresh,cv2.RETR_TREE,cv2.CHAIN_APPROX_SIMPLE)
largest_areas = sorted(contours, key=cv2.contourArea)
cv2.drawContours(im_new, [largest_areas[-2]], 0, (255,255,255,255), -1)

image_masked = cv2.bitwise_and(imgray, imgray, mask=im_new)

area = cv2.contourArea(largest_areas[-2])

for contour in largest_areas:
    areas = cv2.contourArea(contour)
    if areas > 300:
        print areas

print 'Complete area :' + str(n_image.shape[0] * n_image.shape[1])

print 'Area of selected region : ' + str(area)

cv2.imshow('main', image_masked)
cv2.waitKey(1000)

我从中得到的结果是

113455.5
135587.0
303849.0
Complete area :307200
Area of selected region : 135587.0

我在用生成的轮廓（最大轮廓）掩盖图像后得到了这个图像结果

希望这会有所帮助！祝你好运:)