从嘈杂的车牌上分割每个字符 [英] segment each character from noisy number plate
问题描述
我正在做一个有关尼泊尔车牌检测的项目,我从车辆ani中检测到我的车牌,但ani歪了车牌,但结果是车牌的图像很吵.
I am doing a project on Nepali Number Plate Detection where I have detected my number plate from the vehicle ani skewed the number plate but the result is a noisy image of number plate.
我想知道如何将每个字符分割出来,以便可以将其发送给检测部分.我尝试这样做,但它只是将第二行中的字符分段了.
I want to know how to segment every character out of it so it could be sent for detection part. I tried doing this but it just segmented the characters from second line.
def segment(image):
H = 100.
height, width, depth = image.shape
imgScale = H/height
newX,newY = image.shape[1]*imgScale, image.shape[0]*imgScale
image = cv2.resize(image,(int(newX),int(newY)))
cv2.imshow("Show by CV2",image)
cv2.waitKey(0)
cv2.imwrite("resizeimg.jpg",image)
idx =0
gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
_,thresh = cv2.threshold(gray,127,255,cv2.THRESH_TOZERO)
cv2.imshow("thresh",thresh)
cv2.waitKey(0)
# gray=cv2.cvtColor(plate,cv2.COLOR_BW2GRAY)
_,contours,_ = cv2.findContours(thresh,cv2.RETR_LIST,cv2.CHAIN_APPROX_SIMPLE)
for cnt in contours:
idx += 1
x,y,w,h = cv2.boundingRect(cnt)
roi = image[y:y+h,x:x+w]
if(w > 10 and h > 10):
cv2.imwrite(str(idx) + '.jpg', roi)
推荐答案
假设您具有平板的比例,并且可以通过y轴将平板切成两半.从左到右,脱粒图像,morphologyEx图像,轮廓.将其与另一半相同.
Suppose you have the ratio of the plate and you can cut the plate by half by y-axis. From left to right, thresh image, morphologyEx image, contours. Apply the same with the other half.
image = cv2.imread("1.PNG")
gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
_,thresh = cv2.threshold(gray,127,255,cv2.THRESH_TOZERO)
cv2.imshow("thresh",thresh)
element = cv2.getStructuringElement(shape=cv2.MORPH_RECT, ksize=(5, 11))
morph_img = thresh.copy()
cv2.morphologyEx(src=thresh, op=cv2.MORPH_CLOSE, kernel=element, dst=morph_img)
cv2.imshow("morph_img",morph_img)
_,contours,_ = cv2.findContours(morph_img,cv2.RETR_LIST,cv2.CHAIN_APPROX_SIMPLE)
for c in contours:
r = cv2.boundingRect(c)
cv2.rectangle(image,(r[0],r[1]),(r[0]+r[2],r[1]+r[3]),(0,0,255),2)
cv2.imshow("img",image)
cv2.waitKey(0)
cv2.destroyAllWindows()
分割字符的另一种方法是沿x轴和y轴查找灰度值之和.您可以轻松地看到x轴上有3个峰,这是3个字符,而y轴上有1个峰,这是您的字符所在的位置.
Another way to segment the characters is to find sum of gray values along x-axis and y-axis. You can easily see there are 3 peaks in x-axis which are 3 characters and 1 peak in y-axis that is where your characters located.
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