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Algorithm to detect corners of paper sheet in photo
...[1])
# these constants are carefully picked
MORPH = 9
CANNY = 84
HOUGH = 25
img = cv2.cvtColor(orig, cv2.COLOR_BGR2GRAY)
cv2.GaussianBlur(img, (3,3), 0, img)
# this is to recognize white on white
kernel = cv2.getStructuringElement(cv2.MORPH_RECT,(MORPH,MORPH))
...
How to install MySQLdb (Python data access library to MySQL) on Mac OS X?
...ragraph applied to Snow Leopard, but not to Lion, which appears to require 64-bit MySQL
First off, the author (still?) of MySQLdb says here that one of the most pernicious problems is that OS X comes installed with a 32 bit version of Python, but most average joes (myself included) probably jump to...
Media Queries: How to target desktop, tablet, and mobile?
...possible to press - especially on your screen!
– greg84
Jan 15 '14 at 0:01
6
@media only screen a...
Append text to input field
... edited Mar 6 '16 at 19:06
L84
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answered May 8 '09 at 21:00
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C++ preprocessor __VA_ARGS__ number of arguments
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HolyBlackCat
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answered Jan 23 '10 at 19:22
Kornel KisielewiczKornel Kisielew...
MIME type warning in chrome for png images
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84
I encountered this while running an ASP.NET WebForms app using the ASP.NET Development Server.
...
How to make good reproducible pandas examples
... cs95
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answered Jul 19 '16 at 18:35
piRSquaredpiRSquared
220k3232 ...
Simple calculations for working with lat/lon and km distance?
...ing - for that you'd probably want a more complicated formula using the WGS84 reference ellipsoid (the model used for GPS). But the error is probably negligible for your purposes.
Source: http://en.wikipedia.org/wiki/Latitude
Caution: Be aware that latlong coordinates are expressed in degrees, wh...
np.mean() vs np.average() in Python NumPy?
... axes 0 and 1, I get wildly incorrect results unless I specify dtype='float64':
>T.shape
(4096, 4096, 720)
>T.dtype
dtype('<f4')
m1 = np.average(T, axis=(0,1)) # garbage
m2 = np.mean(T, axis=(0,1)) # the same garbage
m3 = np.mean(T, axis=(0,1), dtype='fl...
Apply pandas function to column to create multiple new columns?
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