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61160492
编写于
5月 25, 2012
作者:
A
Alexander Mordvintsev
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电子邮件补丁
差异文件
video_threaded.py sample now uses multiprocessing module's ThreadPool
上级
a71e690b
变更
1
隐藏空白更改
内联
并排
Showing
1 changed file
with
18 addition
and
52 deletion
+18
-52
samples/python2/video_threaded.py
samples/python2/video_threaded.py
+18
-52
未找到文件。
samples/python2/video_threaded.py
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61160492
import
numpy
as
np
import
numpy
as
np
import
cv2
import
cv2
from
Queue
import
Queue
from
multiprocessing.pool
import
ThreadPool
from
threading
import
Thread
from
collections
import
deque
from
collections
import
deque
class
Worker
(
Thread
):
def
__init__
(
self
,
tasks
):
Thread
.
__init__
(
self
)
self
.
tasks
=
tasks
self
.
daemon
=
True
self
.
start
()
def
run
(
self
):
while
True
:
func
,
args
,
kargs
=
self
.
tasks
.
get
()
try
:
func
(
*
args
,
**
kargs
)
except
Exception
,
e
:
print
e
self
.
tasks
.
task_done
()
class
ThreadPool
:
def
__init__
(
self
,
num_threads
):
self
.
tasks
=
Queue
(
num_threads
)
for
_
in
range
(
num_threads
):
Worker
(
self
.
tasks
)
def
add_task
(
self
,
func
,
*
args
,
**
kargs
):
self
.
tasks
.
put
((
func
,
args
,
kargs
))
def
wait_completion
(
self
):
self
.
tasks
.
join
()
if
__name__
==
'__main__'
:
if
__name__
==
'__main__'
:
results
=
deque
()
def
process_frame
(
frame
):
# some intensive computation...
def
process_frame
(
i
,
frame
):
frame
=
cv2
.
medianBlur
(
frame
,
19
)
global
results
frame
=
cv2
.
medianBlur
(
frame
,
19
)
res
=
cv2
.
medianBlur
(
frame
,
15
)
frame
=
cv2
.
medianBlur
(
frame
,
19
)
re
sults
.
append
((
i
,
res
))
re
turn
frame
pool
=
ThreadPool
(
4
)
threadn
=
8
cap
=
cv2
.
VideoCapture
(
0
)
cap
=
cv2
.
VideoCapture
(
0
)
frame_count
=
0
pool
=
ThreadPool
(
processes
=
threadn
)
last_frame
=
None
pending
=
deque
()
last_count
=
-
1
while
True
:
while
True
:
ret
,
frame
=
cap
.
read
()
while
len
(
pending
)
>
0
and
pending
[
0
].
ready
():
pool
.
add_task
(
process_frame
,
frame_count
,
frame
.
copy
())
res
=
pending
.
popleft
().
get
()
frame_count
+=
1
cv2
.
imshow
(
'result'
,
res
)
while
len
(
results
)
>
0
:
if
len
(
pending
)
<
threadn
+
1
:
i
,
frame
=
results
.
popleft
()
ret
,
frame
=
cap
.
read
()
if
i
>
last_count
:
task
=
pool
.
apply_async
(
process_frame
,
(
frame
.
copy
(),))
last_count
,
last_frame
=
i
,
frame
pending
.
append
(
task
)
if
last_frame
is
not
None
:
cv2
.
imshow
(
'res'
,
last_frame
)
if
cv2
.
waitKey
(
1
)
==
27
:
if
cv2
.
waitKey
(
1
)
==
27
:
break
break
pool
.
wait_completion
()
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