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App Inventor 2 图像矫正教程 - 透视变换与文档扫描 · App Inventor 2 中文网
...r.getWebViewString();
if(msg && msg.startsWith("CORRECT:")){
var base64 = msg.substring(8);
var img = new Image();
img.onload = function(){
// 透视变换矫正
var src = cv.imread(img);
var dst = new cv.Mat();
// 定义原始四角和目标四角
var src...
How to list the contents of a package using YUM?
... 00:00
extras | 3.4 kB 00:00
updates | 3.4 kB 00:00
(1/4): extras/7/x86_64/primary_db | 166 kB 00:00
(2/4): base/7/x86_64/group_gz | 155 kB 00:00
(3/4): updates/7/x86_64/primary_db | 9.1 MB 00:04
(4/4): base/7/x86_64/primary_db | 5.3 MB 00:05
Determining fastest mirrors
* base: mirrors.xmiss...
Keep only date part when using pandas.to_datetime
...the dates in my data. Pandas by default represents the dates with datetime64[ns] even though the dates are all daily only.
I wonder whether there is an elegant/clever way to convert the dates to datetime.date or datetime64[D] so that, when I write the data to CSV, the dates are not appended wi...
Windows 7, 64 bit, DLL problems
...th our executable. I'm running this C++ 32-bit executable on my Windows 7 64-bit development box that also has all those Microsoft applications (Visual Studio 2008 + 2010, TFS, SDK, Microsoft Office)...
And it's still running just fine.
...
Error to run Android Studio
..._91"
Java(TM) SE Runtime Environment (build 1.8.0_91-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.91-b14, mixed mode)
Check what compiler is used
javac -version
It should show something like this
javac 1.8.0_91
Finally, add JAVA_HOME to the environment variable
Edit /etc/environment and...
Android SDK Manager Not Installing Components
...roid Studio), do the following in Terminal
cd /android/adt-bundle-mac-x86_64/sdk/tools
sudo ./android sdk
This launches SDK manager as admin. Now update/install the packages from SDK manager and it'll work.
share
...
App Inventor 2 拓展参考文档 · App Inventor 2 中文网
...AI2组件对象
【Hash】文件Hash拓展：文件哈希计算和 Base64 编码文件，sha256、sha512 哈希
【向量计算】VectorArithmetic 拓展：计算两个向量相加的结果向量
【手机管理】App Inventor 2 TaifunTM 拓展：获取本机手机号码
【电池管理】Ap...
Why is require_once so bad to use?
...calls are made:
time(NULL) = 1223772434
lstat64("/home", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
lstat64("/home/fbarnes", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
lstat64("/home/fbarnes/phpperf", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
lstat64("/home...
Maximum number of records in a MySQL database table
...
2147483647 max, so you only have to make autoincrement bigint if you're working with multiple billions of entries? (which would probably just make your select statements melt down long before then)
– Kzqai
...
Fastest way to iterate over all the chars in a String
...e strings as byte[] by default.
SECOND UPDATE: As of 2016-10-25, on my AMDx64 8core and source 1.8, there is no difference between using 'charAt' and field access. It appears that the jvm is sufficiently optimized to inline and streamline any 'string.charAt(n)' calls.
THIRD UPDATE: As of 2020-09-07,...