使用遙控器做截圖時發生了一些問題，參考網頁的方式解決，需要修改程式碼
錯誤訊息
camera = Camera()
widget_width = camera.width
widget_height = camera.height
image_widget = widgets.Image(format='jpeg', width=widget_width, height=widget_height)
target_widget = widgets.Image(format='jpeg', width=widget_width, height=widget_height)
x_slider = widgets.FloatSlider(min=-1.0, max=1.0, step=0.001, description='x')
y_slider = widgets.FloatSlider(min=-1.0, max=1.0, step=0.001, description='y')
def display_xy(camera_image):
image = np.copy(camera_image)
x = x_slider.value
y = y_slider.value
x = int(x * widget_width / 2 + widget_width / 2)
y = int(y * widget_height / 2 + widget_height / 2)
image = cv2.circle(image, (x, y), 8, (0, 255, 0), 3)
image = cv2.circle(image, (widget_width / 2, widget_height), 8, (0, 0,255), 3)
image = cv2.line(image, (x,y), (widget_width / 2, widget_height), (255,0,0), 3)
jpeg_image = bgr8_to_jpeg(image)
return jpeg_image
time.sleep(1)
traitlets.dlink((camera, 'value'), (image_widget, 'value'), transform=bgr8_to_jpeg)
traitlets.dlink((camera, 'value'), (target_widget, 'value'), transform=display_xy)
display(widgets.HBox([image_widget, target_widget]), x_slider, y_slider)
results in this error:
Exception in thread Thread-4:
Traceback (most recent call last):
File "/usr/lib/python3.6/threading.py", line 916, in _bootstrap_inner
self.run()
File "/usr/lib/python3.6/threading.py", line 864, in run
self._target(*self._args, **self._kwargs)
File "/usr/local/lib/python3.6/dist-packages/jetbot-0.4.1-py3.6.egg/jetbot/camera/opencv_gst_camera.py", line 45, in _capture_frames
self.value = image
File "/usr/local/lib/python3.6/dist-packages/traitlets/traitlets.py", line 588, in __set__
self.set(obj, value)
File "/usr/local/lib/python3.6/dist-packages/traitlets/traitlets.py", line 577, in set
obj._notify_trait(self.name, old_value, new_value)
File "/usr/local/lib/python3.6/dist-packages/traitlets/traitlets.py", line 1210, in _notify_trait
type='change',
File "/usr/local/lib/python3.6/dist-packages/traitlets/traitlets.py", line 1215, in notify_change
return self._notify_observers(change)
File "/usr/local/lib/python3.6/dist-packages/traitlets/traitlets.py", line 1252, in _notify_observers
c(event)
File "/usr/local/lib/python3.6/dist-packages/traitlets/traitlets.py", line 361, in _update
self._transform(change.new))
File "<ipython-input-2-8bd7c62a3894>", line 19, in display_xy
image = cv2.circle(image, (widget_width / 2, widget_height), 8, (0, 0,255), 3)
TypeError: integer argument expected, got float
TypeErrorTraceback (most recent call last)
<ipython-input-2-8bd7c62a3894> in <module>
24 time.sleep(1)
25 traitlets.dlink((camera, 'value'), (image_widget, 'value'), transform=bgr8_to_jpeg)
---> 26 traitlets.dlink((camera, 'value'), (target_widget, 'value'), transform=display_xy)
27
28 display(widgets.HBox([image_widget, target_widget]), x_slider, y_slider)
/usr/local/lib/python3.6/dist-packages/traitlets/traitlets.py in __init__(self, source, target, transform)
337 _validate_link(source, target)
338 self.source, self.target = source, target
--> 339 self.link()
340
341 def link(self):
/usr/local/lib/python3.6/dist-packages/traitlets/traitlets.py in link(self)
342 try:
343 setattr(self.target[0], self.target[1],
--> 344 self._transform(getattr(self.source[0], self.source[1])))
345 finally:
346 self.source[0].observe(self._update, names=self.source[1])
<ipython-input-2-8bd7c62a3894> in display_xy(camera_image)
17 y = int(y * widget_height / 2 + widget_height / 2)
18 image = cv2.circle(image, (x, y), 8, (0, 255, 0), 3)
---> 19 image = cv2.circle(image, (widget_width / 2, widget_height), 8, (0, 0,255), 3)
20 image = cv2.line(image, (x,y), (widget_width / 2, widget_height), (255,0,0), 3)
21 jpeg_image = bgr8_to_jpeg(image)
TypeError: integer argument expected, got float
網友解決方案---widget_width / 2加上int()，因為TypeError: integer argument expected, got float
I think I have found the problem. These 2 lines are expecting an integer and are getting a float. I modified these 2 lines to change the float to integer:
->19 image = cv2.circle(image, (widget_width / 2, widget_height), 8, (0, 0,255), 3)
->20 image = cv2.line(image, (x,y), (widget_width / 2, widget_height), (255,0,0), 3)
to this:
image = cv2.circle(image, (int(widget_width / 2), widget_height), 8, (0, 0,255), 3)
image = cv2.line(image, (x,y), (int(widget_width / 2), widget_height), (255,0,0), 3)