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Algorithm to detect corners of paper sheet in photo

What is the best way to detect the corners of an invoice/receipt/sheet-of-paper in a photo? This is to be used for subsequent perspective correction, before OCR. ...
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UIView Hide/Show with animation

My simple goal is to fade animate hiding and showing functions. 21 Answers 21 ...
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Draw in Canvas by finger, Android

I need to build a project for drawing on canvas by fingers, 6 Answers 6 ...
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How to sleep for five seconds in a batch file/cmd [duplicate]

Windows's Snipping tool can capture the screen, but sometimes I want to capture the screen after five seconds, such as taking an image being displayed by the webcam. (Run the script and smile at the camera, for example.) ...
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How can I create directory tree in C++/Linux?

I want an easy way to create multiple directories in C++/Linux. 17 Answers 17 ...
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Is there any boolean type in Oracle databases?

Is there any Boolean type in Oracle databases, similar to the BIT datatype in Ms SQL Server? 11 Answers ...
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How to generate keyboard events in Python?

short summary: 9 Answers 9 ...
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Change navbar color in Twitter Bootstrap

How would I go about modifying the CSS to change the color of the navbar in Twitter Bootstrap? 12 Answers ...
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Local dependency in package.json

I want to do something like this, so npm install also installs the package.json of ../somelocallib or more importantly its dependencies. ...
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Calculating frames per second in a game

What's a good algorithm for calculating frames per second in a game? I want to show it as a number in the corner of the screen. If I just look at how long it took to render the last frame the number changes too fast. ...