python - 如何修复项目中的 openCV cvtColor 错误?
问题描述
我正在构建手写识别项目,但cvtColor
在尝试将图像从BGR2HSV
.
cap = cv2.VideoCapture(0)
Lower_blue = np.array([110, 50, 50])
Upper_blue = np.array([130, 255, 255])
pred_class = 0
pts = deque(maxlen = 512)
blackboard = np.zeros((480, 640, 3), dtype = np.uint8)
digit = np.zeros((200, 200, 3), dtype = np.uint8)
while(cap.isOpened()):
ret, img = cap.read()
img = cv2.flip(img, 1)
imgHSV = cv2.cvtColor(img, cv2.COLOR_BGR2HSV)
mask = cv2.inRange(imgHSV, Lower_blue, Upper_blue)
blur = cv2.medianBlur(mask, 15)
blur = cv2.GaussianBlur(blur, (5, 5), 0)
thresh = cv2.threshold(blur, 0, 255, cv2.THRESH_BINARY + cv2.THRESH_OTSU)[1]
cnts = cv2.findContours(thresh.copy(), cv2.RETR_TREE, cv2.CHAIN_APPROX_NONE)[1]
center = None
if len(cnts) >= 1:
contour = max(cnts, key = cv2.contourArea)
if cv2.contourArea(contour) > 250:
((x, y), radius) = cv2.minEnclosingCircle(contour)
cv2.circle(img, (int(x), int(y)), int(radius), (0, 255, 255), 2)
cv2.circle(img, center, 5, (0, 255, 255), -1)
M = cv2.moments(contour)
center = (int(M['m10'] / M['m00']), int(M['m01'] / M['m00']))
pts.appendleft(center)
for i in range (1, len(pts)):
if pts[i - 1] is None or pts[i] is None:
continue
cv2.line(blackboard, pts[i - 1], pts[i], (255, 255, 255), 10)
cv2.line(img, pts[i - 1], pts[i], (0, 0,255), 5)
elif len(cnts) == 0:
if len(pts) != []:
blackboard_gray = cv2.cvtColor(blackboard, cv2.COLOR_BGR2GRAY)
blur1 = cv2.medianBlur(blackboard_gray, 15)
blur1 = cv2.GaussianBlur(blur1, (5, 5), 0)
thresh1 = cv2.threshold(blur1, 0, 255, cv2.THRESH_BINARY + cv2.THRESH_OTSU)[1]
blackboard_cnts = cv2.findContours(thresh1.copy(), cv2.RETR_TREE, cv2.CHAIN_APPROX_NONE)[1]
if len(blackboard_cnts) >= 1:
cnt = max(blackboard_cnts, key = cv2.contourArea)
print(cv2.contourArea(cnt))
if cv2.contourArea(cnt) > 2000:
x, y, w, h = cv2.boundingRect(cnt)
digit = blackboard_gray[y:y + h, x:x + w]
#new Image = process_letter(digit)
pred_probab, pred_class = keras_predict(model1, digit)
print(pred_class, pred_probab)
pts = deque(maxlen = 512)
blackboard = np.zeros((480, 640, 3), dtype = uint8)
cv2.putText(img, "Conv Network : " + str(letter_count [pred_class]), (10, 470),
cv2.FONT_HERSHEY_SIMPLEX, 0.7, (0, 0, 255), 2)
cv2.imshow("Frame", img)
cv2.imshow("Contours", thresh)
k = cv2.waitkey(10)
if k == 27:
break
如何解决这个 OpenCV 错误问题?请帮忙!
我收到以下错误:
error: OpenCV(3.4.1) C:\Miniconda3\conda-bld\opencv-suite_1533128839831\work\modules\imgproc\src\color.cpp:11214: error: (-215) (scn == 3 || scn == 4) && (depth == 0 || depth == 5) in function cv::cvtColor
解决方案
我认为以下错误:error: (-215) (scn == 3 || scn == 4) && (depth == 0 || depth == 5) in function cv::cvtColor
是因为相机无法正确捕获帧。通过打印ret
值进行检查。它相机能够正确捕获帧,它将返回True
,否则False
。发生上述错误是因为None
已传递给cv2.cvtColor
函数。您可以使用以下代码作为安全检查:
if ret is True:
# your code goes here
else:
break
此外,请考虑以下几点:
- 它是
cv2.waitKey(10)
, 不是cv2.waitkey(10)
[大写 'K'] cv2.findContours
函数返回3
值(即图像、轮廓和层次结构),OpenCV 3.x
但仅返回2
值(即轮廓、层次结构)openCV 4.x
len(pts) != []
没有意义。在这里,您试图将一个数字与一个空列表进行比较。将其更改为len(pts) != 0
.letter_count
cv2 里面有什么。putText
功能。请重新检查一下。- 代替在and的情况下重新初始化 deque(
pts = deque(maxlen = 512)
) ,您可以通过简单地使用清除它来使用旧的。只是一个想法!len(cnts)==0
len(pts) != 0
pts
pts.clear()
另外,在最后添加以下代码:
cap.release() cv2.destroyAllWindows()
试试下面的修改代码(使用测试openCV v4.0.0
):
import cv2
import numpy as np
from collections import deque
cap = cv2.VideoCapture(0)
Lower_blue = np.array([110, 50, 50])
Upper_blue = np.array([130, 255, 255])
pred_class = 0
pts = deque(maxlen = 512)
blackboard = np.zeros((480, 640, 3), dtype = np.uint8)
digit = np.zeros((200, 200, 3), dtype = np.uint8)
while(cap.isOpened()):
ret, img = cap.read()
img = cv2.flip(img, 1)
imgHSV = cv2.cvtColor(img, cv2.COLOR_BGR2HSV)
mask = cv2.inRange(imgHSV, Lower_blue, Upper_blue)
blur = cv2.medianBlur(mask, 15)
blur = cv2.GaussianBlur(blur, (5, 5), 0)
thresh = cv2.threshold(blur, 0, 255, cv2.THRESH_BINARY + cv2.THRESH_OTSU)[1]
cnts = cv2.findContours(thresh.copy(), cv2.RETR_TREE, cv2.CHAIN_APPROX_NONE)[0]
center = None
if len(cnts) >= 1:
contour = max(cnts, key = cv2.contourArea)
if cv2.contourArea(contour) > 250:
((x, y), radius) = cv2.minEnclosingCircle(contour)
cv2.circle(img, (int(x), int(y)), int(radius), (0, 255, 255), 2)
cv2.circle(img, center, 5, (0, 255, 255), -1)
M = cv2.moments(contour)
center = (int(M['m10'] / M['m00']), int(M['m01'] / M['m00']))
pts.appendleft(center)
# print(pts)
for i in range (1, len(pts)):
if pts[i - 1] is None or pts[i] is None:
print("Continue")
continue
cv2.line(blackboard, pts[i - 1], pts[i], (255, 255, 255), 10)
cv2.line(img, pts[i - 1], pts[i], (0, 0,255), 5)
cv2.imshow("Frame", img)
cv2.imshow("Contours", thresh)
# press q to stop
if cv2.waitKey(1) & 0xFF == ord('q'):
break
else:
if len(pts) != 0:
blackboard_gray = cv2.cvtColor(blackboard, cv2.COLOR_BGR2GRAY)
blur1 = cv2.medianBlur(blackboard_gray, 15)
blur1 = cv2.GaussianBlur(blur1, (5, 5), 0)
thresh1 = cv2.threshold(blur1, 0, 255, cv2.THRESH_BINARY + cv2.THRESH_OTSU)[1]
print('Hello')
blackboard_cnts = cv2.findContours(thresh1.copy(), cv2.RETR_TREE, cv2.CHAIN_APPROX_NONE)[0]
if len(blackboard_cnts) >= 1:
cnt = max(blackboard_cnts, key = cv2.contourArea)
print(cv2.contourArea(cnt))
if cv2.contourArea(cnt) > 2000:
x, y, w, h = cv2.boundingRect(cnt)
digit = blackboard_gray[y:y + h, x:x + w]
#new Image = process_letter(digit)
#pred_probab, pred_class = keras_predict(model1, digit)
print(digit.shape)
#pts = deque(maxlen = 512)
pts.clear()
blackboard = np.zeros((480, 640, 3), dtype = np.uint8)
#cv2.putText(img, "Conv Network : " + str(letter_count[pred_class]), (10, 470), cv2.FONT_HERSHEY_SIMPLEX, 0.7, (0, 0, 255), 2)
cv2.putText(img, "Conv Network :", (10, 470), cv2.FONT_HERSHEY_SIMPLEX, 0.7, (0, 0, 255), 2)
cv2.imshow("Frame", img)
cv2.imshow("Contours", thresh)
if cv2.waitKey(1) & 0xFF == ord('q'):
break
cap.release()
cv2.destroyAllWindows()
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