{"id":473,"date":"2014-01-23T12:23:12","date_gmt":"2014-01-23T17:23:12","guid":{"rendered":"http:\/\/homepages.uc.edu\/~yaozo\/wordpress\/?p=473"},"modified":"2014-01-23T12:23:12","modified_gmt":"2014-01-23T17:23:12","slug":"opencv-python-webcam-example","status":"publish","type":"post","link":"https:\/\/zhuoyao.net\/index.php\/2014\/01\/23\/opencv-python-webcam-example\/","title":{"rendered":"OpenCV python webcam example"},"content":{"rendered":"
#!\/Users\/brent\/.virtualenvs\/lumber\/bin\/python<\/div>\n
<\/div>\n
<\/div>\n
import cv<\/div>\n
<\/div>\n
cv.NamedWindow(“w1”, cv.CV_WINDOW_AUTOSIZE)<\/div>\n
camera_index = 0<\/div>\n
capture = cv.CaptureFromCAM(camera_index)<\/div>\n
<\/div>\n
gx = gy = 1<\/div>\n
grayscale = blur = canny = False<\/div>\n
<\/div>\n
def repeat():<\/div>\n
global capture #declare as globals since we are assigning to them now<\/div>\n
global camera_index<\/div>\n
global gx, gy, grayscale, canny, blur<\/div>\n
frame = cv.QueryFrame(capture)<\/div>\n
# import pdb; pdb.set_trace()<\/div>\n
<\/div>\n
if grayscale:<\/div>\n
gray = cv.CreateImage(cv.GetSize(frame), frame.depth, 1)<\/div>\n
cv.CvtColor(frame, gray, cv.CV_RGB2GRAY)<\/div>\n
frame = gray<\/div>\n
<\/div>\n
if blur:<\/div>\n
g = cv.CreateImage(cv.GetSize(frame), cv.IPL_DEPTH_8U, frame.channels)<\/div>\n
cv.Smooth(frame, g, cv.CV_GAUSSIAN, gx, gy)<\/div>\n
frame = g<\/div>\n
<\/div>\n
if grayscale and canny:<\/div>\n
c = cv.CreateImage(cv.GetSize(frame), frame.depth, frame.channels)<\/div>\n
cv.Canny(frame, c, 10, 100, 3)<\/div>\n
frame = c<\/div>\n
cv.ShowImage(“w1”, frame)<\/div>\n
<\/div>\n
c = cv.WaitKey(10)<\/div>\n
if c==ord(‘=’): #in “n” key is pressed while the popup window is in focus<\/div>\n
gx += 2<\/div>\n
gy += 2<\/div>\n
elif c == ord(‘-‘):<\/div>\n
gx = max(1, gx-2)<\/div>\n
gy = max(1, gy-2)<\/div>\n
elif c == ord(‘x’):<\/div>\n
gx += 2<\/div>\n
elif c == ord(‘X’):<\/div>\n
gx = max(1, gx-2)<\/div>\n
elif c == ord(‘q’):<\/div>\n
exit(0)<\/div>\n
<\/div>\n
elif c == ord(‘b’):<\/div>\n
blur = not blur<\/div>\n
elif c == ord(‘g’):<\/div>\n
grayscale = not grayscale<\/div>\n
elif c == ord(‘c’):<\/div>\n
canny = not canny<\/div>\n
<\/div>\n
<\/div>\n
<\/div>\n
<\/div>\n
while True:<\/div>\n
repeat()<\/div>\n","protected":false},"excerpt":{"rendered":"

#!\/Users\/brent\/.virtualenvs\/lumber\/bin\/python import cv cv.NamedWindow(“w1”, cv.CV_WINDOW_AUTOSIZE) camera_index = 0 capture = cv.CaptureFromCAM(camera_index) gx = gy = 1 grayscale = blur = canny = False def repeat():… <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[],"class_list":["post-473","post","type-post","status-publish","format-standard","hentry","category-computer-vision"],"_links":{"self":[{"href":"https:\/\/zhuoyao.net\/index.php\/wp-json\/wp\/v2\/posts\/473","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/zhuoyao.net\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/zhuoyao.net\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/zhuoyao.net\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/zhuoyao.net\/index.php\/wp-json\/wp\/v2\/comments?post=473"}],"version-history":[{"count":0,"href":"https:\/\/zhuoyao.net\/index.php\/wp-json\/wp\/v2\/posts\/473\/revisions"}],"wp:attachment":[{"href":"https:\/\/zhuoyao.net\/index.php\/wp-json\/wp\/v2\/media?parent=473"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/zhuoyao.net\/index.php\/wp-json\/wp\/v2\/categories?post=473"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/zhuoyao.net\/index.php\/wp-json\/wp\/v2\/tags?post=473"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}