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pkQueueTS - Treadsafe queue for OpenCV Mats

10-12-2016

A single lock, multiple producer/consumer (MPMC) thread safe queue with wait/timeout Pop. It also provides tools to manage elements like cv::Mat and an interface for custom OnPush event handler.

Standard deviation numerically stable calculation for SQL

17-06-2014

Despite of Standard Deviation is one of most relevant parameter of descriptive statistics, it isn't available as common aggregation function for some SQL server. Here is described how to calculate and use standard deviation in a single select query. Finally a better and numerically stable sql procedure is shown.

PkCBitmap: Windows Bitmap File Loader C++ class

14-01-2010

Viene presentata una classe la lettura ultra veloce di un file bitmap in C++. La versione originale a cura di Benjamin Kalytta è stata modificata da PkLab introducendo, tra l'altro, il riutilizzo della memoria.

Reading from file and fast access to image pixels with C#

13-01-2010

This page describes how to use Image::FromFile methods to read image form file and howto gain fast access to its pixel using Bitmap::LockBits in VisualStudio. Example code and performance test are shown. Finally, above performace are compared to C++ native CBitmap class.

Recursive gaussian filter implementation

07-01-2010

Gaussian filter is used for signal processing. It Is a low band pass filter usefull to remove high fequency noise (Smoothing). This page shows a 2D recursive implementation as explained by T.Youg, Lucas J, van Vliet