path = self.files[self.count] # Load image img0 = path if isinstance(path, np.ndarray) else cv2.imread(path) # BGR
时间: 2024-05-21 22:17:45 浏览: 15
这段代码的作用是加载一张图片。首先,`self.files` 是一个列表,其中包含了需要加载的所有图片的路径信息。`self.count` 是一个计数器,表示当前需要加载的图片在 `self.files` 中的索引。该行代码使用 `self.count` 从 `self.files` 中获取需要加载的图片的路径信息,并将其存储在 `path` 变量中。
接下来,代码使用 `cv2.imread()` 函数读取图片。如果 `path` 已经是一个 NumPy 数组,则直接将其赋值给 `img0` 变量;否则,使用 `cv2.imread()` 函数从 `path` 路径读取图片,并将读取的图片以 BGR 格式存储在 `img0` 变量中。
相关问题
im0 = path if isinstance(path, np.ndarray) else cv2.imread(path) # BGR此时im0的格式和 ret, frame = camera.read()一样吗
不完全一样。`cv2.imread()`读取的图像格式是 BGR(蓝-绿-红),而`camera.read()`返回的图像格式是通道顺序为 RGB(红-绿-蓝)或灰度图像。因此,如果你想在`camera.read()`返回的图像上进行处理,需要将其转换为 BGR 格式,可以使用`cv2.cvtColor()`函数进行转换,例如:`frame = cv2.cvtColor(frame, cv2.COLOR_RGB2BGR)`。
def _normalize_idx(self, idx): nidx = idx if nidx < 0: nidx += len(self) if nidx < 0: nidx = 0 return nidx def __getitem__(self, idx): """Implements `x = self[idx]`""" assert(isinstance(idx, int)) nidx = self._normalize_idx(idx) if nidx >= self.length: raise IndexError else: #start at head, skip the NONE sentinel, now at index 0, while loop to walk to nidx, return data # or figure out closer to head or head.prior(tail), make the walk shorter if idx< (self.length/2): #start at head.next, walk forward idx number of nodes current=self.head.next count=0 while count<nidx: current=current.next count+=1 else: #start at head.prior, walk backward len(self.data)-idx-1 number of nodes current=self.head.prior count=self.length-1 while count>nidx: current=current.prior count-=1 return current.val 改写代码风格并保持变量名,代码意思不变
下面是改写后的代码风格:
```
def _normalize_idx(self, idx):
nidx = idx
if nidx < 0:
nidx += len(self)
if nidx < 0:
nidx = 0
return nidx
def __getitem__(self, idx):
"""Implements `x = self[idx]`"""
assert(isinstance(idx, int))
nidx = self._normalize_idx(idx)
if nidx >= self.length:
raise IndexError
else:
# Start at head, skip the NONE sentinel, now at index 0, while loop to walk to nidx, return data
# Or figure out closer to head or head.prior(tail), make the walk shorter
if idx < (self.length/2): # Start at head.next, walk forward idx number of nodes
current = self.head.next
count = 0
while count < nidx:
current = current.next
count += 1
else: # Start at head.prior, walk backward len(self.data)-idx-1 number of nodes
current = self.head.prior
count = self.length-1
while count > nidx:
current = current.prior
count -= 1
return current.val
```
注意,变量名没有改变,只是对代码进行了一些格式化和注释。