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camgrab-0.9.1
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مشاهده بیشترتوضیحات
Python library for grabbing images from webcams
| ویژگی | مقدار |
|---|---|
| سیستم عامل | - |
| نام فایل | camgrab-0.9.1 |
| نام | camgrab |
| نسخه کتابخانه | 0.9.1 |
| نگهدارنده | [] |
| ایمیل نگهدارنده | [] |
| نویسنده | Tom Smith |
| ایمیل نویسنده | tom@takeontom.com |
| آدرس صفحه اصلی | https://github.com/takeontom/camgrab |
| آدرس اینترنتی | https://pypi.org/project/camgrab/ |
| مجوز | MIT license |
camgrab
=======
Python library to download images from network accessible webcams.
Features
--------
* Out of the box, handles any webcam which provides a publically accessible URL
to a JPG snapshot of their current image.
* Easily swap in different downloaders to handle cams which expose their
snapshots in a more complex way.
* Highly configurable.
* Provides a simple base for more advanced functionality, such as motion
detection, CCTV systems, image analysis, etc.
Installation
------------
.. code:: sh
pip install camgrab
Quick start
-----------
To simply grabbing images from a webcam every 2 seconds and start saving them
to the default `grabbed_images` directory:
.. code:: python
from camgrab import Grabber
grabber = Grabber('http://www.masconcable.ca/webcams/chase.jpg')
grabber.begin()
Examples
--------
Quickly add a custom result handler
...................................
Here we create a custom result handler which will simply print the
dimensions of the grabbed image.
The default result handlers (e.g. `do_save_image()`) will still be used.
.. code:: python
from camgrab import Grabber
url = 'http://www.masconcable.ca/webcams/chase.jpg'
def print_dimensions(result, grabber):
if not result.get('image', None):
return
width, height = result['image'].size
print(
'{width} pixels wide, {height} pixels high!'.
format(width=width, height=height)
)
grabber = Grabber(url, every=5, extra_result_handlers=(print_dimensions, ))
grabber.begin()
More complex result handling
............................
In this example, we'll take full control of the result handling, creating a
chain of result handlers to:
* resize the image to 320x200
* rotate the image by 90 degrees
* save the image
* print the final result dictionary to the terminal
.. code:: python
from camgrab import Grabber
from camgrab.camgrab import do_save_image
url = 'http://www.masconcable.ca/webcams/chase.jpg'
def resize_image(result, grabber):
if not result.get('image', None):
return
result['image'] = result['image'].resize((320, 200))
def rotate_image(result, grabber):
if not result.get('image', None):
return
result['image'] = result['image'].rotate(90)
def print_result(result, grabber):
print(result)
# Setting result_handlers attribute completely overrides any default result
# handlers previously set. Hence making sure `do_save_image` (which is normally
# a default handler) is in this tuple:
result_handlers = (resize_image, rotate_image, do_save_image, print_result)
grabber = Grabber(url, every=5)
grabber.result_handlers = result_handlers
grabber.begin()
Take control of the main loop
.............................
If the the main loop created by the `begin()` method is too simple for your
needs, then either override the `begin()` method or simply call `tick()` from
your own consumer.
In this example, we consume a Grabber but define our own (not terribly useful)
main loop which waits a random amount of time between ticks:
.. code:: python
from random import random
from time import sleep
from camgrab import Grabber
url = 'http://www.masconcable.ca/webcams/chase.jpg'
grabber = Grabber(url)
while True:
grabber.tick()
# Wait somewhere between 0 and 10 seconds
sleep(random() * 10)
Error handling
--------------
Grabbing images from webcams is a messy business... They go offline loads, send
corrupted images, sometimes they randomly start sending Server 500 errors, etc.
Because of all this, camgrab's default settings make it pretty tolerant of
common errors which occur when grabbing an image. But this can be configured
easily enough.
When an unhandled exception is raised during a ``tick()`` which causes a crash,
the exception which caused the crash can be found in the ``failed_exception``
attribute.
HTTP errors
...........
HTTP errors can be ignored or raised by setting `ignore_xxx` attributes. For
example...
By default HTTP 404 errors are not ignored by default. So when a 404 error
occurs the grabber will crash and you can handle the exception in whatever way
you want.
.. code:: python
from urllib.error import HTTPError
from camgrab import Grabber
grabber = Grabber('http://www.masconcable.ca/webcams/chase.jpg')
try:
grabber.begin()
except HTTPError as e:
if e.code == 404:
print('Was it something I said?')
If you'd rather HTTP 404 errors didn't cause a crash, then set the `ignore_404`
attribute:
.. code:: python
from camgrab import Grabber
grabber = Grabber('http://www.masconcable.ca/webcams/chase.jpg')
grabber.ignore_404 = True
grabber.begin()
Now when a 404 error occurs, the Grabber will:
* add the exception to the result dictionary
* set the image in the result dictionary to `None`
And then continue its normal routine.
By default, the following HTTP status codes are ignored:
* 307, 400, 408, 409, 429, 444, 451, 499, 500, 502, 503, 504, 507, 599
Network errors
..............
camgrab ignores network errors by default. If you'd rather network timeouts
caused a crash, then just set the `ignore_timeout` attribute:
.. code:: python
from socket import timeout
from urllib.error import URLError
from camgrab import Grabber
grabber = Grabber('http://www.masconcable.ca/webcams/chase.jpg')
grabber.ignore_timeout = False
try:
grabber.begin()
except URLError as e:
if isinstance(e.reason, timeout):
print("It's me, not you")
License
-------
camgrab is free software, distributed under the MIT license.
نیازمندی
| مقدار | نام |
|---|---|
| >=4 | pillow |
نحوه نصب
نصب پکیج whl camgrab-0.9.1:
pip install camgrab-0.9.1.whl
نصب پکیج tar.gz camgrab-0.9.1:
pip install camgrab-0.9.1.tar.gz