大约有 40,000 项符合查询结果（耗时：0.0597秒） [XML]
How can I sharpen an image in OpenCV?
...
Wikipedia has a good overview of kernels with some more examples here - https://en.wikipedia.org/wiki/Kernel_(image_processing)
In image processing, a kernel, convolution matrix, or mask is a small matrix. It is used for blurring, sharpening, embossing, edge detection, and more. This is accom...
MongoDB and “joins” [duplicate]
...o the aggregation pipeline is essentially identical to a left outer join:
https://docs.mongodb.org/master/reference/operator/aggregation/lookup/#pipe._S_lookup
From the docs:
{
$lookup:
{
from: <collection to join>,
localField: <field from the input documents>,
...
How to save a PNG image server-side, from a base64 data string
...ay that discussed topic is documented in RFC 2397 - The "data" URL scheme (https://tools.ietf.org/html/rfc2397)
Because of this PHP has a native way to handle such data - "data: stream wrapper" (http://php.net/manual/en/wrappers.data.php)
So you can easily manipulate your data with PHP streams:
$...
How to print a string in fixed width?
... | ERROR | failed running main
More info at the docs here: https://docs.python.org/2/library/stdtypes.html#string-formatting-operations
share
|
improve this answer
|
...
How to “git show” a merge commit with combined diff output even when every changed file agrees with
...
Seems like answered here:
https://public-inbox.org/git/7vd392ezhx.fsf@alter.siamese.dyndns.org/
So in a similar way, running
$ git diff --cc $M $M^1 $M^2 $(git merge-base $M^1 $M^2)
should show a combined patch that explains the state at $M relative ...
Making Python loggers output all messages to stdout in addition to log file
....handlers:
handler.close()
log.removeFilter(handler)
Please see: https://docs.python.org/2/howto/logging-cookbook.html
share
|
improve this answer
|
follow
...
How to throw std::exceptions with variable messages?
...std::exception & ex) {
You can find some inspiration on this topic in https://books.google.ru/books?id=6tjfmnKhT24C Chapter 9
Also, you can provide a custom message too, but be careful - it is not safe to compose a message with either std::string or std::stringstream or any other way which can ...
How to stop a goroutine
...
Personally, I'd like to use range on a channel in a goroutine:
https://play.golang.org/p/qt48vvDu8cd
Dave has written a great post about this: http://dave.cheney.net/2013/04/30/curious-channels.
share
|...
Can I call a constructor from another constructor (do constructor chaining) in C++?
...different constructors as well or you would create a recursive call.
Ref: https://isocpp.org/wiki/faq/ctors#init-methods
share
|
improve this answer
|
follow
...
Starting python debugger automatically on error
...in python 3.2 so entering 'c' is required for earlier Python versions (see https://docs.python.org/3/library/pdb.html).
share
|
improve this answer
|
follow
|
...