Python &引用;ValueError:无效的数据缓冲区大小。”;将Nmpy图像从BGR转换为RBG后,在wx.Bitmap.FromBuffer中
我正在将numpy图像从BGR转换为RBG格式,并且此图像正在转换为wx.Bitmap图像,但在转换过程中,我得到了位图图像的“ValueError:无效数据缓冲区大小”。 在没有BGR到RBG转换的情况下,位图图像可以正常生成 使用错误代码:Python &引用;ValueError:无效的数据缓冲区大小。”;将Nmpy图像从BGR转换为RBG后,在wx.Bitmap.FromBuffer中,python,numpy,opencv,bitmap,wxpython,Python,Numpy,Opencv,Bitmap,Wxpython,我正在将numpy图像从BGR转换为RBG格式,并且此图像正在转换为wx.Bitmap图像,但在转换过程中,我得到了位图图像的“ValueError:无效数据缓冲区大小”。 在没有BGR到RBG转换的情况下,位图图像可以正常生成 使用错误代码: class Video: def __init__(self): # self._filename = file_name self._frame_number = -1 self._cap = c
class Video:
def __init__(self):
# self._filename = file_name
self._frame_number = -1
self._cap = cv2.VideoCapture('Path/t/o/Video') ###self._filename
self._frameCount = int(self._cap.get(cv2.CAP_PROP_FRAME_COUNT))
self._frameWidth = int(self._cap.get(cv2.CAP_PROP_FRAME_WIDTH))
self._frameHeight = int(self._cap.get(cv2.CAP_PROP_FRAME_HEIGHT))
self._frame_count = 0
self._frame_grabbed = True
self.img = np.array((self._frameHeight, self._frameWidth, 3), np.dtype('uint8'))
def iter_frames(self): # Generator to return Numpy and BitMap Image
while self._frame_count < self._frameCount and self._frame_grabbed:
self._frame_count += 1
self._frame_grabbed, self.img = self._cap.read()
print(type(self.img))
#self.img.reshape(self._frameHeight,self._frameWidth, 3)
self.img = self.img[..., ::-1] # To convert BGR to RGB
yield self.img, wx.Bitmap.FromBuffer(self._frameWidth, self._frameHeight, self.img)
v=Video()
print(next(iter_frames()))
课堂视频:
定义初始化(自):
#self.\u filename=文件名
self.\u帧\u编号=-1
self._cap=cv2.VideoCapture('Path/t/o/Video')###self._文件名
self.\u frameCount=int(self.\u cap.get(cv2.cap\u PROP\u FRAME\u COUNT))
self.\u frameWidth=int(self.\u cap.get(cv2.cap\u PROP\u FRAME\u WIDTH))
self.\u frameHeight=int(self.\u cap.get(cv2.cap\u PROP\u FRAME\u HEIGHT))
自。\帧\计数=0
self.\u frame\u=True
self.img=np.array((self.\u frameHeight,self.\u frameWidth,3),np.dtype('uint8'))
def iter_帧(self):#用于返回Numpy和位图图像的生成器
而self.\u frame\u count
遇到错误:
File "C:/Users/qpjg1605/Documents/Python_proj/Auptimo/Video_file.py", line 46, in <module>
print(next(v.iter_frames()))
File "C:/Users/qpjg1605/Documents/Python_proj/Auptimo/Video_file.py", line 30, in iter_frames
yield self.img, wx.Bitmap.FromBuffer(self._frameWidth, self._frameHeight, self.img)
ValueError: Invalid data buffer size.
文件“C:/Users/qpjg1605/Documents/Python\u proj/Auptimo/Video\u File.py”,第46行,在
打印(下一个(v.iter_frames()))
文件“C:/Users/qpjg1605/Documents/Python_proj/Auptimo/Video_File.py”,第30行,在iter_框架中
产生self.img,wx.Bitmap.FromBuffer(self.\u frameWidth,self.\u frameHeight,self.img)
ValueError:无效的数据缓冲区大小。
但是,当我使用numpy数组(self.buf[])的代码时,它工作得很好。”
相同的代码:
class Video:
def __init__(self):
# self._filename = file_name
self._frame_number = -1
self._cap = cv2.VideoCapture('Path\to\Video') ###self._filename
self._frameCount = int(self._cap.get(cv2.CAP_PROP_FRAME_COUNT))
self._frameWidth = int(self._cap.get(cv2.CAP_PROP_FRAME_WIDTH))
self._frameHeight = int(self._cap.get(cv2.CAP_PROP_FRAME_HEIGHT))
self._buf = np.empty((self._frameCount, self._frameHeight, self._frameWidth, 3),np.dtype('uint8')) # Empy numpy array of the shape and dtype(pixel from 0 to 255)
self._frame_count = 0
self._frame_grabbed = True
print("here")
while self._frame_count < self._frameCount and self._frame_grabbed:
self._frame_grabbed, self._buf[self._frame_count] = self._cap.read()
self._buf[self._frame_count] = self._buf[self._frame_count][..., ::-1]## Converting BGR to RBG(last dimension)
#self._buf[self._frame_count] = imutils.resize(self._buf[self._frame_count], 640, 360)
self._frame_count += 1
def iter_frames(self):
while self._frame_number < self._frameCount:
self._frame_number = self._frame_number + 1
# yield int(self._frame_number)
# cur_bmp = wx.Bitmap.FromBuffer(self.get_org_frame_width(), self.get_org_frame_height(), )
print(self._frame_number)
yield self._buf[self._frame_number], wx.Bitmap.FromBuffer(self.get_org_frame_width(),
self.get_org_frame_height(),
self._buf[self._frame_number])
课堂视频:
定义初始化(自):
#self.\u filename=文件名
self.\u帧\u编号=-1
self._cap=cv2.VideoCapture('Path\to\Video')###self._文件名
self.\u frameCount=int(self.\u cap.get(cv2.cap\u PROP\u FRAME\u COUNT))
self.\u frameWidth=int(self.\u cap.get(cv2.cap\u PROP\u FRAME\u WIDTH))
self.\u frameHeight=int(self.\u cap.get(cv2.cap\u PROP\u FRAME\u HEIGHT))
self.\u buf=np.empty((self.\u frameCount,self.\u frameHeight,self.\u frameWidth,3),np.dtype('uint8'))#形状和dtype的Empy numpy数组(像素从0到255)
自。\帧\计数=0
self.\u frame\u=True
打印(“此处”)
而self.\u frame\u count
这将创建一个包含3项的数组。第一个参数是用于填充数组的iterable,而不是数组的形状。可能您希望创建带有
np.zero
或类似值的数组。在这种情况下,第一个参数是形状。解决了位图转换问题:
def iter_frames(self): # Frame Generator to yield next frame
while self._frame_count < self._frameCount and self._frame_grabbed:
self._frame_count += 1
self._frame_grabbed, self.img = self._cap.read()
self.img = cv2.cvtColor(self.img,cv2.COLOR_BGR2RGB)
yield self.img, wx.Bitmap.FromBuffer(640, 360, cv2.resize(self.img, (640, 360)))
def iter_帧(self):#生成下一帧的帧生成器
而self.\u frame\u count
`尝试在运行的代码中对self.img=np.array((self.\u frameHeight,self.\u frameWidth,3),np.dtype('uint8')进行赋值:
self.\u frame\u count+=1 self.\u frame\u抓取,self.img=self.\u cap.read()self.img=self.img[…,:-1]生成self.img,wx.Bitmap.FromBuffer(self.\u frameWidth,self.\u frameHeight,self.img)
但在尝试将其从BGR转换为RGB时仍出现相同错误:生成self.img,wx.Bitmap.FromBuffer(self.\u frameWidth,self.\u frameHeight,self.img)值错误:数据缓冲区大小无效。
@robindann
def iter_frames(self): # Frame Generator to yield next frame
while self._frame_count < self._frameCount and self._frame_grabbed:
self._frame_count += 1
self._frame_grabbed, self.img = self._cap.read()
self.img = cv2.cvtColor(self.img,cv2.COLOR_BGR2RGB)
yield self.img, wx.Bitmap.FromBuffer(640, 360, cv2.resize(self.img, (640, 360)))