def cropRois(image, rects, multHeight=0.73, multWidth=0.97, topHeightCrop=30):
crops = []
data = {}
# TODO cut off angle outliers here too
angles = []
for r in rects:
box = rect2Box(r)
W = r[1][0]
H = r[1][1]
Xs = [i[0] for i in box]
Ys = [i[1] for i in box]
x1 = min(Xs)
x2 = max(Xs)
y1 = min(Ys)
y2 = max(Ys)
rotated = False
angle = r[2]
if angle < -45:
angle += 90
rotated = True
# calc the centroid
center = (int((x1 + x2) / 2), int((y1 + y2) / 2))
size = (int((x2 - x1)), int((y2 - y1)))
#cv2.circle(image, center, 2, 255, -1)
M = cv2.getRotationMatrix2D((size[0] / 2, size[1] / 2), angle, 1.0)
# prepare the crop
cropped = cv2.getRectSubPix(image, size, center)
cropped = cv2.warpAffine(cropped, M, size)
croppedW = W if not rotated else H
croppedH = H if not rotated else W
ratio = float(croppedW) / (croppedH)
area = float(croppedW) * croppedH
# if in the ratio
if (ratio > 2 and ratio < 16):
#text = "{0:.2f}-{1:.2f} ".format(ratio, area)
#cv2.putText(image, text, center, cv2.FONT_HERSHEY_SIMPLEX, 0.5, (0, 255, 0), 2)
croppedRotated = cv2.getRectSubPix(
cropped,
(int(croppedW * multWidth),
int(croppedH *
multHeight if croppedH < topHeightCrop else croppedH *
0.9)), (size[0] / 2, size[1] / 2))
# save the angles to calc the avg/std
angles.append(angle)
# save the crops
crops.append(croppedRotated)
# will process from top to bottom, so save it to sort later
data[y1] = [croppedRotated, area, ratio, angle]
return data, np.mean(np.array(angles)), np.std(np.array(angles))
def rotate_and_resize(image, rotation_matrix, old_size, new_size):
rotated_image = cv2.warpAffine(src=image,
M=rotation_matrix,
dsize=old_size)
resized_image = cv2.getRectSubPix(
rotated_image, new_size, (int(old_size[0] / 2), int(old_size[1] / 2)))
return resized_image
def take_center_square(image):
"""take the center square of the original image and returns it"""
height, width = image.shape[:2]
min_dimension = min(height, width)
center = (width / 2, height / 2)
square_center_image = cv2.getRectSubPix(image,
(min_dimension, min_dimension),
center)
return square_center_image
def extractPlate(imgOriginal, listOfMatchingChars):
possiblePlate = PossiblePlate.PossiblePlate()
listOfMatchingChars.sort(key=lambda matchingChar: matchingChar.intCenterX)
fltPlateCenterX = (
listOfMatchingChars[0].intCenterX +
listOfMatchingChars[len(listOfMatchingChars) - 1].intCenterX) / 2.0
fltPlateCenterY = (
listOfMatchingChars[0].intCenterY +
listOfMatchingChars[len(listOfMatchingChars) - 1].intCenterY) / 2.0
ptPlateCenter = fltPlateCenterX, fltPlateCenterY
intPlateWidth = int(
(listOfMatchingChars[len(listOfMatchingChars) - 1].intBoundingRectX +
listOfMatchingChars[len(listOfMatchingChars) - 1].intBoundingRectWidth
- listOfMatchingChars[0].intBoundingRectX) *
PLATE_WIDTH_PADDING_FACTOR)
intTotalOfCharHeights = 0
for matchingChar in listOfMatchingChars:
intTotalOfCharHeights = intTotalOfCharHeights + matchingChar.intBoundingRectHeight
fltAverageCharHeight = intTotalOfCharHeights / len(listOfMatchingChars)
intPlateHeight = int(fltAverageCharHeight * PLATE_HEIGHT_PADDING_FACTOR)
fltOpposite = listOfMatchingChars[
len(listOfMatchingChars) -
1].intCenterY - listOfMatchingChars[0].intCenterY
fltHypotenuse = DetectChars.distanceBetweenChars(
listOfMatchingChars[0],
listOfMatchingChars[len(listOfMatchingChars) - 1])
fltCorrectionAngleInRad = math.asin(fltOpposite / fltHypotenuse)
fltCorrectionAngleInDeg = fltCorrectionAngleInRad * (180.0 / math.pi)
possiblePlate.rrLocationOfPlateInScene = (tuple(ptPlateCenter),
(intPlateWidth, intPlateHeight),
fltCorrectionAngleInDeg)
rotationMatrix = cv2.getRotationMatrix2D(tuple(ptPlateCenter),
fltCorrectionAngleInDeg, 1.0)
height, width, numChannels = imgOriginal.shape
imgRotated = cv2.warpAffine(imgOriginal, rotationMatrix, (width, height))
imgCropped = cv2.getRectSubPix(imgRotated, (intPlateWidth, intPlateHeight),
tuple(ptPlateCenter))
possiblePlate.imgPlate = imgCropped
return possiblePlate
def process_image(self, image, debug_mode):
"""Detects license plates in the given 'image' using haar features. 'debug_mode' can be set to true to save the
found image patches for debugging"""
gray_image = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
lps = self.classifier.detectMultiScale(gray_image)
if debug_mode:
for box in lps:
(left, top, w, h) = box
lp_image_patch = cv2.getRectSubPix(image, (w, h),
(left + w / 2, top + h / 2))
save_debug_image(lp_image_patch,
str(abs(hash(image.tostring()))),
"plate_candidates")
plates: [Plate] = []
for box in lps:
plate = Plate()
left, top, width, height = box
plate.box = [top, left, top + height, left + width]
plates.append(plate)
return plates
def retrieve_dipstick_image(image, contour):
""" Calculate the minimum area bounding the dipstick image, then apply a
rotation matrix to straighten the rectangle. If the dipstick has been rotated
into a vertical position it is rotated anticlockwise. The horizontal dipstick
image is then resized for extracting squares on the dipstick.
"""
try:
rectangle = cv.minAreaRect(contour)
except cv.error:
return None
center, size, theta = rectangle
height, width = image.shape[:2]
center, size = tuple(map(int, center)), tuple(map(int, size))
matrix = cv.getRotationMatrix2D(center, theta, 1)
dst = cv.warpAffine(image, matrix, (width, height))
dipstick = cv.getRectSubPix(dst, size, center)
if dipstick.shape[0] > dipstick.shape[1]:
dipstick = cv.rotate(dipstick, cv.ROTATE_90_COUNTERCLOCKWISE)
dipstick = imutils.resize(dipstick, width=800)
return dipstick
def videoCap():
# pytesseract.pytesseract.tesseract_cmd = "C:/Program Files/Tesseract-OCR/tesseract"
cap = cv2.VideoCapture(
'C:/Users/jeawa/Desktop/project/LPR_Project/project/video/test_car.mp4'
)
count = 0
before_chars = ""
while True:
el = cv2.getTickCount()
fps = cap.get(5)
ret, img_ori = cap.read()
height, width, channel = img_ori.shape # 높이, 너비, 채널 확보
gray = cv2.cvtColor(img_ori, cv2.COLOR_BGR2GRAY)
# img_ori = cv2.imread('LPR_Project/project/image/3.jpg') # 이미지 불러오기
# gray = cv2.cvtColor(img_ori, cv2.COLOR_BGR2GRAY)
img_blurred = cv2.GaussianBlur(gray, ksize=(3, 3), sigmaX=0) # 노이즈 제거
img_thresh = cv2.adaptiveThreshold(
img_blurred,
maxValue=255.0,
adaptiveMethod=cv2.ADAPTIVE_THRESH_GAUSSIAN_C,
thresholdType=cv2.THRESH_BINARY_INV,
blockSize=19, # 12 통과 15,20
C=9)
contours, _ = cv2.findContours( # 윤곽선을 찾기
img_thresh,
mode=cv2.RETR_LIST, #
method=cv2.CHAIN_APPROX_TC89_KCOS #
)
temp_result = np.zeros((height, width, channel), dtype=np.uint8)
cv2.drawContours(
temp_result, # 원본이미지
contours=contours, # contours 정보
contourIdx=-1, # -1 : 전체
color=(255, 255, 255),
thickness=1)
contours_dict = []
for contour in contours:
x, y, w, h = cv2.boundingRect(contour) # 컴투어를 감싸는 사각형
# cv2.rectangle(
# temp_result,
# pt1=(x, y),
# pt2=(x+w, y+h),
# color=(255, 255, 255),
# thickness=1
# )
contours_dict.append({
'contour': contour,
'x': x,
'y': y,
'w': w,
'h': h,
'cx': x + (w / 2), # 중심 좌표
'cy': y + (h / 2)
})
MIN_AREA, MAX_AREA = 100, 1000 # boundingRect(사각형)의 최소넓이
MIN_WIDTH, MIN_HEIGHT = 2, 8 # boundingRect의 최소 넓이, 높이 2, 8
MIN_RATIO, MAX_RATIO = 0.3, 0.9 # boundingRect의 가로 세로 비율
possible_contours = [] # 위의 조건의 만족하는 사각형
cnt = 0
for d in contours_dict:
area = d['w'] * d['h'] # 가로 * 세로 = 면적
ratio = d['w'] / d['h'] # 가로 / 세로 = 비율
if MIN_AREA < area < MAX_AREA and d['w'] > MIN_WIDTH and d[
'h'] > MIN_HEIGHT and MIN_RATIO < ratio < MAX_RATIO:
d['idx'] = cnt # 조건의 맞는 값을 idx에 저장한다.
cnt += 1
possible_contours.append(d) # possible_contour를 업데이트한다.
# temp_result = np.zeros((height, width, channel), dtype=np.uint8)
for d in possible_contours:
# cv2.drawContours(temp_result, d['contour'], -1, (255, 255, 255))
cv2.rectangle(temp_result,
pt1=(d['x'], d['y']),
pt2=(d['x'] + d['w'], d['y'] + d['h']),
color=(0, 0, 255),
thickness=1)
MAX_DIAG_MULTIPLYER = 4 # 대각선의 5배 안에 있어야함
MAX_ANGLE_DIFF = 12.0 # 12.0 #세타의 최대값 12, 0.7, 0.5, 0.6, 3
MAX_AREA_DIFF = 0.3 # 0.5 #면적의 차이
MAX_WIDTH_DIFF = 0.5 # 너비차이
MAX_HEIGHT_DIFF = 0.6 # 높이차이
MIN_N_MATCHED = 4 # 3 #위의 조건이 3개 미만이면 뺀다
def find_chars(contour_list): #
matched_result_idx = [] # idx 값 저장
for d1 in contour_list:
matched_contours_idx = []
for d2 in contour_list:
if d1['idx'] == d2['idx']: # d1 과 d2가 같으면 컨티뉴
continue
dx = abs(d1['cx'] - d2['cx'])
dy = abs(d1['cy'] - d2['cy'])
diagonal_length1 = np.sqrt(d1['w']**2 + d1['h']**2)
distance = np.linalg.norm(
np.array([d1['cx'], d1['cy']]) -
np.array([d2['cx'], d2['cy']])) # 대각선 길이
if dx == 0:
angle_diff = 90 # 0일 때 각도 90도 (예외처리)
else:
angle_diff = np.degrees(np.arctan(dy / dx)) # 세타 구하기
area_diff = abs(d1['w'] * d1['h'] - d2['w'] * d2['h']) / (
d1['w'] * d1['h']) # 면적 비율
width_diff = abs(d1['w'] - d2['w']) / d1['w'] # 너비비율
height_diff = abs(d1['h'] - d2['h']) / d1['h'] # 높이비율
# 조건들
if distance < diagonal_length1 * MAX_DIAG_MULTIPLYER \
and angle_diff < MAX_ANGLE_DIFF and area_diff < MAX_AREA_DIFF \
and width_diff < MAX_WIDTH_DIFF and height_diff < MAX_HEIGHT_DIFF:
# d2만 넣었기 때문에 마지막으로 d1을 넣은다
matched_contours_idx.append(d2['idx'])
# append this contour
matched_contours_idx.append(d1['idx'])
if len(matched_contours_idx) < MIN_N_MATCHED: # 3개 이하이면 번호판 x
continue
matched_result_idx.append(matched_contours_idx) # 최종 후보군
unmatched_contour_idx = [] # 최종후보군이 아닌 애들
for d4 in contour_list:
if d4['idx'] not in matched_contours_idx:
unmatched_contour_idx.append(d4['idx'])
unmatched_contour = np.take(possible_contours,
unmatched_contour_idx)
# recursive
recursive_contour_list = find_chars(unmatched_contour)
for idx in recursive_contour_list:
matched_result_idx.append(idx) # 번호판 이외의 값을 재정의
break
return matched_result_idx
result_idx = find_chars(possible_contours)
matched_result = []
for idx_list in result_idx:
matched_result.append(np.take(possible_contours, idx_list))
# visualize possible contours
temp_result = np.zeros((height, width, channel), dtype=np.uint8)
for r in matched_result:
for d in r:
cv2.rectangle(temp_result,
pt1=(d['x'], d['y']),
pt2=(d['x'] + d['w'], d['y'] + d['h']),
color=(0, 0, 255),
thickness=1)
PLATE_WIDTH_PADDING = 1.2 # 1.3
PLATE_HEIGHT_PADDING = 1.5 # 1.5
MIN_PLATE_RATIO = 3
MAX_PLATE_RATIO = 7 #10
plate_imgs = []
plate_infos = []
for i, matched_chars in enumerate(matched_result):
sorted_chars = sorted(matched_chars,
key=lambda x: x['cx']) # x방향으로 순차적으로 정렬
plate_cx = (sorted_chars[0]['cx'] +
sorted_chars[-1]['cx']) / 2 # 센터 좌표 구하기
plate_cy = (sorted_chars[0]['cy'] + sorted_chars[-1]['cy']) / 2
plate_width = (sorted_chars[-1]['x'] + sorted_chars[-1]['w'] -
sorted_chars[0]['x']) * PLATE_WIDTH_PADDING # 너비
# sum_height = 0
# for d in sorted_chars:
# sum_height += d['h']
# plate_height = int(sum_height / len(sorted_chars)
# * PLATE_HEIGHT_PADDING) # 높이
plate_height = (sorted_chars[-1]['y'] - sorted_chars[0]['y'] +
sorted_chars[-1]['h']) * PLATE_HEIGHT_PADDING
#
triangle_height = sorted_chars[-1]['cy'] - sorted_chars[0]['cy']
triangle_hypotenus = np.linalg.norm(
np.array([sorted_chars[0]['cx'], sorted_chars[0]['cy']]) -
np.array([sorted_chars[-1]['cx'], sorted_chars[-1]['cy']]))
angle = np.degrees(np.arcsin(triangle_height / triangle_hypotenus))
rotation_matrix = cv2.getRotationMatrix2D(center=(plate_cx,
plate_cy),
angle=angle,
scale=1.0)
# 회전
img_rotated = cv2.warpAffine(img_thresh,
M=rotation_matrix,
dsize=(width, height))
img_cropped = cv2.getRectSubPix(img_rotated,
patchSize=(int(plate_width),
int(plate_height)),
center=(int(plate_cx),
int(plate_cy)))
if img_cropped.shape[1] / img_cropped.shape[
0] < MIN_PLATE_RATIO or img_cropped.shape[
1] / img_cropped.shape[
0] < MIN_PLATE_RATIO > MAX_PLATE_RATIO:
continue
plate_imgs.append(img_cropped)
plate_infos.append({
'x': int(plate_cx - plate_width / 2),
'y': int(plate_cy - plate_height / 2),
'w': int(plate_width),
'h': int(plate_height)
})
for i, plate_img in enumerate(plate_imgs):
plate_img = cv2.resize(plate_img, dsize=(0, 0), fx=1.6, fy=1.6)
_, plate_img = cv2.threshold(plate_img,
thresh=0.0,
maxval=255.0,
type=cv2.THRESH_BINARY
| cv2.THRESH_OTSU)
# plt.imshow(plate_img, cmap='gray')
# plt.show()
# find contours again (same as above)
contours, _ = cv2.findContours(plate_img,
mode=cv2.RETR_LIST,
method=cv2.CHAIN_APPROX_SIMPLE)
plate_min_x, plate_min_y = plate_img.shape[1], plate_img.shape[
0]
plate_max_x, plate_max_y = 0, 0
for contour in contours:
x, y, w, h = cv2.boundingRect(contour)
area = w * h
ratio = w / h
if area > MIN_AREA \
and w > MIN_WIDTH and h > MIN_HEIGHT \
and MIN_RATIO < ratio < MAX_RATIO:
if x < plate_min_x:
plate_min_x = x
if y < plate_min_y:
plate_min_y = y
if x + w > plate_max_x:
plate_max_x = x + w
if y + h > plate_max_y:
plate_max_y = y + h
img_result = plate_img[plate_min_y:plate_max_y,
plate_min_x:plate_max_x]
img_result = cv2.GaussianBlur(img_result, ksize=(3, 3), sigmaX=0)
_, img_result = cv2.threshold(img_result,
thresh=0.0,
maxval=255.0,
type=cv2.THRESH_BINARY
| cv2.THRESH_OTSU)
img_result = cv2.copyMakeBorder(img_result,
top=10,
bottom=10,
left=20,
right=10,
borderType=cv2.BORDER_CONSTANT,
value=(0, 0, 0))
chars = pytesseract.image_to_string(img_result,
lang='kor',
config='--psm 7 --oem 0')
result_chars = ''
has_digit = False
# <= ord('힣')
for c in chars:
if \
+ ord('가') == ord(c) or \
+ ord('나') == ord(c) or \
+ ord('다') == ord(c) or \
+ ord('라') == ord(c) or \
+ ord('마') == ord(c) or \
+ ord('거') == ord(c) or \
+ ord('너') == ord(c) or \
+ ord('더') == ord(c) or \
+ ord('러') == ord(c) or \
+ ord('머') == ord(c) or \
+ ord('버') == ord(c) or \
+ ord('서') == ord(c) or \
+ ord('어') == ord(c) or \
+ ord('저') == ord(c) or \
+ ord('고') == ord(c) or \
+ ord('노') == ord(c) or \
+ ord('도') == ord(c) or \
+ ord('로') == ord(c) or \
+ ord('모') == ord(c) or \
+ ord('보') == ord(c) or \
+ ord('소') == ord(c) or \
+ ord('오') == ord(c) or \
+ ord('조') == ord(c) or \
+ ord('구') == ord(c) or \
+ ord('누') == ord(c) or \
+ ord('두') == ord(c) or \
+ ord('루') == ord(c) or \
+ ord('무') == ord(c) or \
+ ord('부') == ord(c) or \
+ ord('수') == ord(c) or \
+ ord('우') == ord(c) or \
+ ord('주') == ord(c) or \
+ ord('아') == ord(c) or \
+ ord('바') == ord(c) or \
+ ord('사') == ord(c) or \
+ ord('자') == ord(c) or \
+ ord('배') == ord(c) or \
+ ord('하') == ord(c) or \
+ ord('허') == ord(c) or \
+ ord('호') == ord(c) or c.isdigit():
if c.isdigit():
has_digit = True
result_chars += c
# print(result_chars)
# print(len(result_chars))
if result_chars == "":
pass
else:
if before_chars == result_chars and 6 < len(result_chars) < 9:
count += 1
else:
before_chars = result_chars
count = 0
if count == 1:
print(result_chars)
count = 0
before_chars = ""
# print(fps + " : 프레임 영상입니다.")
print(fps)
a = np.hstack((img_ori, temp_result))
cv2.imshow("Go", a)
if cv2.waitKey(42) == ord('q'):
break
e2 = cv2.getTickCount()
time = (e2 - el) / cv2.getTickFrequency()
print(time)
# print("1프레임 : 1초당 처리속도는 " + time + "입니다.")
cap.release()
cv2.destroyAllWindows()
def get_image_patch_from_contour(image, contour):
"""Returns the specified area from the image"""
x, y, w, h = cv2.boundingRect(contour)
size = (int(w * 1.2), int(h * 1.5))
center = (x + w / 2, y + h / 2)
return cv2.getRectSubPix(image, size, center)
def get_image_patch_from_rect(image, rect):
"""Returns the specified area from the image"""
top, left, bottom, right = rect
size = (right - left, bottom - top)
center = (left + size[0] / 2, top + size[1] / 2)
return cv2.getRectSubPix(image, size, center)
