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bugfix

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This commit is contained in:
yumoqing 2020-09-23 12:16:27 +08:00
parent 9d777e773b
commit 0dec7130da
1 changed files with 46 additions and 7 deletions
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53
kivyblocks/kivycamera.py
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@ -5,28 +5,61 @@ from kivy.graphics.texture import Texture
from kivy.factory import Factory from kivy.factory import Factory
import cv2 import cv2
def set_res(cap, x,y):
cap.set(cv2.CAP_PROP_FRAME_WIDTH, int(x))
cap.set(cv2.CAP_PROP_FRAME_HEIGHT, int(y))
return cap.get(cv2.CAP_PROP_FRAME_WIDTH),cap.get(cv2.CAP_PROP_FRAME_HEIGHT)
class KivyCamera(Image): class KivyCamera(Image):
def __init__(self, fps=25.0, face_detect=Falsem **kwargs): def __init__(self, camera_id=0, fps=25.0, face_detect=False, **kwargs):
print('KivyCamera inited')
self.update_task = None
self.capture = None
super(KivyCamera, self).__init__(**kwargs) super(KivyCamera, self).__init__(**kwargs)
self.capture = cv2.VideoCapture(0) self.capture = cv2.VideoCapture(camera_id)
self.face_detect = face_detect self.face_detect = face_detect
self.camera_id = camera_id
self.faceCascade = None self.faceCascade = None
if face_detect: if face_detect:
self.faceCascade = cv2.CascadeClassifier("Resources/haarcascades/haarcascade_frontalface_default.xml") # added # self.faceCascade = cv2.CascadeClassifier("Resources/haarcascades/haarcascade_frontalface_default.xml") # added
Clock.schedule_interval(self.update, 1.0 / fps) self.faceCascade = cv2.CascadeClassifier('data/haarcascade/haarcascade_frontalface_default.xml')
self.update_task = Clock.schedule_interval(self.update, 1.0 / fps)
def on_size(self,o,size):
if self.capture:
self.capture.release()
self.capture = cv2.VideoCapture(self.camera_id)
size = set_res(self.capture,self.width,self.height)
print(size)
def add_face_detech(self,frame): def add_face_detech(self,frame):
frameGray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY) frameGray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
faces = self.faceCascade.detectMultiScale(frameGray, 1.1, 4) faces = self.faceCascade.detectMultiScale(frameGray,
scaleFactor = 1.2, minNeighbors = 5)
# THIS LINE RAISE ERROR
# faces = self.faceCascade.detectMultiScale(frameGray, 1.1, 4)
# cv2.error: OpenCV(4.2.0) C:\projects\opencv-python\opencv\modules\objdetect\src\cascadedetect.cpp:1689: error: (-215:Assertion failed) !empty() in function 'cv::CascadeClassifier::detectMultiScale'
for (x, y, w, h) in faces: # added for (x, y, w, h) in faces: # added
cv2.rectangle(frame, (x, y), (x + w, y + h), (255, 0, 0), 2) cv2.rectangle(frame, (x, y), (x + w, y + h), (255, 0, 0), 2)
return frame
def update(self, dt): def update(self, dt):
ret, frame = self.capture.read() ret, frame = self.capture.read()
if ret: if ret:
if self.width / self.height > frame.shape[1] / frame.shape[0]:
fx = fy = self.height / frame.shape[0]
else:
fx = fy = self.width / frame.shape[1]
frame = cv2.resize(frame, None,
fx=fx, fy=fy,
interpolation=cv2.INTER_LINEAR)
if self.faceCascade: if self.faceCascade:
frame = self.add_face_detech(frame) try:
frame = self.add_face_detech(frame)
except:
pass
# convert it to texture # convert it to texture
buf1 = cv2.flip(frame, 0) buf1 = cv2.flip(frame, 0)
buf = buf1.tostring() buf = buf1.tostring()
@ -36,4 +69,10 @@ class KivyCamera(Image):
# display image from the texture # display image from the texture
self.texture = image_texture self.texture = image_texture
Factory.register('Camera',KivyCamera) def __del__(self):
if self.update_task:
self.update_task.cancel()
self.update_task = None
self.cupture.close()
Factory.register('KivyCamera',KivyCamera)