Notes on C++, concurrent programming, and embedded systems. Plus older writing on Qt, Python, and the occasional micrograph.https://saurabhg.com/https://saurabhg.com/blog/disable-opencv-logging/https://saurabhg.com/blog/disable-opencv-logging/When we use OpenCV from command line process, sometimes OpenCV will print internal logging messages such as: This might be useful while debugging OpenCV problems but it is a noise…Tue, 07 Sep 2021 00:00:00 GMTprogrammingcppopencvhttps://saurabhg.com/blog/visual-cpp-version-history/https://saurabhg.com/blog/visual-cpp-version-history/Reference table mapping every Visual C++ release to its _MSC_VER and supported C++ standard.Sun, 29 Aug 2021 00:00:00 GMTprogrammingcppvisual-studiohttps://saurabhg.com/blog/git-command-reference/https://saurabhg.com/blog/git-command-reference/A personal cheat-sheet for git: config, branch, checkout, diff, commit, stash, log, reset, and .gitignore patterns.Thu, 26 Aug 2021 00:00:00 GMTtoolsgithttps://saurabhg.com/blog/microsoft-terminal/https://saurabhg.com/blog/microsoft-terminal/Why Windows Terminal replaced my previous setup, with profile and color-scheme references.Mon, 08 Feb 2021 00:00:00 GMTtoolsterminalwindowshttps://saurabhg.com/blog/microsoft-powertoys/https://saurabhg.com/blog/microsoft-powertoys/Tour of Microsoft PowerToys with a focus on PowerToys Run, Keyboard Manager, and the rest of the tools I rely on day-to-day.Sat, 30 Jan 2021 00:00:00 GMTtoolspowertoyswindowshttps://saurabhg.com/blog/qt-align-widget-in-qtreewidget/https://saurabhg.com/blog/qt-align-widget-in-qtreewidget/Qt comes with a class which can be used to show data in a tree view. It can be used to show hierarchical data using either Model/View framework or by manually creating the…Tue, 26 Jan 2021 00:00:00 GMTprogrammingcppqthttps://saurabhg.com/blog/vtk-python-fps-counter/https://saurabhg.com/blog/vtk-python-fps-counter/In the last post, I discussed how to get started with VTK on Python. In this post, I will show how to add support to show frames per second (FPS). The idea to calculate FPS is…Mon, 18 Jan 2021 00:00:00 GMTprogrammingpythonvtkhttps://saurabhg.com/blog/vtk-python-getting-started/https://saurabhg.com/blog/vtk-python-getting-started/The visualization toolkit (VTK) is a open source library displaying scientific data. VTK is maintained by Kitware, the same company which gave us CMake. VTK is written in C/C++…Fri, 15 Jan 2021 00:00:00 GMTprogrammingpythonvtkhttps://saurabhg.com/blog/goodbye-launchy/https://saurabhg.com/blog/goodbye-launchy/I have been using Launchy for last 15 years since it was first released in 2005. I has been an awesome companion since then and saved me tons of time. Simple press Alt + Space and…Tue, 29 Dec 2020 00:00:00 GMTtoolstoolshttps://saurabhg.com/blog/qt-qwidgetlogger-sloglib/https://saurabhg.com/blog/qt-qwidgetlogger-sloglib/SLogLib is a flexible logging library written in C++. It comes with three logging devices: console, file, and memory but often there is a need to show log directly on the user…Mon, 28 Dec 2020 00:00:00 GMTprogrammingcpploggingqthttps://saurabhg.com/blog/sloglib-multithreading/https://saurabhg.com/blog/sloglib-multithreading/Adding thread safety to SLogLib with std::mutex and std::lock_guard.Sun, 29 Nov 2020 00:00:00 GMTprogrammingcppsloglibhttps://saurabhg.com/blog/numpy-load-allow-pickle-error/https://saurabhg.com/blog/numpy-load-allow-pickle-error/If you received "_Object arrays cannot be loaded when allow_pickle=False_" while loading a numpy array using it is because numpy has changed the default loading behaviour since…Mon, 04 Nov 2019 00:00:00 GMTprogrammingnumpypythonhttps://saurabhg.com/blog/kaggle-dogs-vs-cats-logistic-regression/https://saurabhg.com/blog/kaggle-dogs-vs-cats-logistic-regression/In the previous post, I discussed a solution to Kaggle's Dogs vs. Cats Challenge using Convolutional Neural Networks. CNN's takes time to train and I tried a number of different…Sun, 03 Nov 2019 00:00:00 GMTprogrammingdogs-vs-catspythonregressionsklearnmlhttps://saurabhg.com/blog/kaggle-dogs-vs-cats-cnn/https://saurabhg.com/blog/kaggle-dogs-vs-cats-cnn/Dogs vs. cats challenge [1] from Kaggle ended in Jan 2014 but it is still extremely popular for getting started in deep learning. This is because of two main reasons: the data set…Wed, 30 Oct 2019 00:00:00 GMTprogrammingdogs-vs-catskeraspythontensorflowmlhttps://saurabhg.com/blog/qt-string-selection-widget/https://saurabhg.com/blog/qt-string-selection-widget/Some time back, I developed a data entry application in Qt5. One of the requirements was to let the user select a single string from a predefined list of string. I developed a…Mon, 26 Aug 2019 00:00:00 GMTprogrammingcppqthttps://saurabhg.com/blog/qt-color-picker-widget/https://saurabhg.com/blog/qt-color-picker-widget/Qt5 support standard dialogs such as QFileDialog, QFontDialog, and QColorDialog, however, it does not provide a color picker to allow a user to pick a color. Recently, I need a…Sat, 24 Aug 2019 00:00:00 GMTprogrammingcppqthttps://saurabhg.com/blog/fill-disk-partition/https://saurabhg.com/blog/fill-disk-partition/Recently, I had to give away a computer with couple of disks in it. I wanted to securely erase data on these disks as I stored personal sensitive information on them. Using a…Fri, 23 Aug 2019 00:00:00 GMTprogrammingpythonhttps://saurabhg.com/blog/tomato-cells/https://saurabhg.com/blog/tomato-cells/To see tomato cells under microscope, simply squeeze a bit of tomato juice on a clean glass slide and gently place a cover slip over it. Below is the micrograph of the tomato…Fri, 15 Apr 2016 00:00:00 GMTmicroscopyhttps://saurabhg.com/blog/qt-search-box-qlineedit/https://saurabhg.com/blog/qt-search-box-qlineedit/This week, at work I had to implement a search box for a software I am working on. The search box is to filter some data dynamically as user types a query. I wanted to show a…Thu, 30 Jul 2015 00:00:00 GMTprogrammingcppqthttps://saurabhg.com/blog/markdown-to-pdf-converter/https://saurabhg.com/blog/markdown-to-pdf-converter/Few weeks ago, I published SLogLib (a cross-platform logging library) on GitHub. I wrote the user manual in a readme.md file as is the standard practice at GitHub. However, since…Wed, 29 Jul 2015 00:00:00 GMTprogrammingmarkdownhttps://saurabhg.com/blog/onion-cells/https://saurabhg.com/blog/onion-cells/Wet-mount technique for onion epidermis, with micrographs at 40× and 100×.Mon, 27 Jul 2015 00:00:00 GMTmicroscopymicroscopehttps://saurabhg.com/blog/cross-platform-high-resolution-timer/https://saurabhg.com/blog/cross-platform-high-resolution-timer/Often there is a need to estimate the time it takes for a piece of code to run. This is useful not only for debugging but also for reporting the execution time of lengthy tasks to…Thu, 16 Jul 2015 00:00:00 GMTprogrammingcpphttps://saurabhg.com/blog/sloglib-intro/https://saurabhg.com/blog/sloglib-intro/A long time ago when I was doing PhD I was implementing a very complex geometric algorithm for computing intersection of two triangular meshes. There were bugs in code which would…Sun, 14 Jun 2015 00:00:00 GMTprogrammingcppsloglibhttps://saurabhg.com/blog/cgal-polyhedron3-facet-area/https://saurabhg.com/blog/cgal-polyhedron3-facet-area/In this post I will show how to compute area of a facet in . ComputeFacetArea() is a thread-safe functor for computing the area of a given facet in a CGAL::Polyhedron_3. The facet…Thu, 09 Oct 2014 00:00:00 GMTprogrammingcppcgalhttps://saurabhg.com/blog/cgal-polyhedron3-vertex-normals/https://saurabhg.com/blog/cgal-polyhedron3-vertex-normals/In this post I will show how to compute normal vector at a vector in CGAL::Polyhedron_3. is a thread-safe functor for computing the normal vector at a given vertex in a . The…Thu, 09 Oct 2014 00:00:00 GMTprogrammingcppcgalhttps://saurabhg.com/blog/cgal-polyhedron3-edge-length/https://saurabhg.com/blog/cgal-polyhedron3-edge-length/In this post I will show how to compute edge length for a half-edge in CGAL::Polyhedron_3. ComputeEdgeLength() is a thread-safe functor for computing the edge length of a given…Wed, 08 Oct 2014 00:00:00 GMTprogrammingcppcgalhttps://saurabhg.com/blog/cgal-polyhedron3-facet-normals/https://saurabhg.com/blog/cgal-polyhedron3-facet-normals/In this post I will show how to compute normal vector of a facet in CGAL::Polyhedron_3. ComputeFacetNormal() is a thread-safe functor for computing the normal vector of a given…Wed, 08 Oct 2014 00:00:00 GMTprogrammingcppcgalhttps://saurabhg.com/blog/wavefront-obj-reader-cgal-polyhedron3/https://saurabhg.com/blog/wavefront-obj-reader-cgal-polyhedron3/A small loader that reads vertex coordinates and faces from a Wavefront OBJ file into a CGAL polyhedral surface.Tue, 07 Oct 2014 00:00:00 GMTprogrammingcppcgalhttps://saurabhg.com/blog/paramecium-pond-water/https://saurabhg.com/blog/paramecium-pond-water/A paramecium swimming around in water collected from Swan Lake at the Singapore Botanic Gardens.Sat, 19 Jul 2014 00:00:00 GMTmicroscopymicroscopevideohttps://saurabhg.com/blog/amscope-50pc-slides-gallery/https://saurabhg.com/blog/amscope-50pc-slides-gallery/A consolidated gallery covering the specimens I worked through from the Amscope 50-piece biology prepared-slides kit.Fri, 04 Jul 2014 00:00:00 GMTmicroscopymicroscopeamscopehttps://saurabhg.com/blog/started-microscopy/https://saurabhg.com/blog/started-microscopy/I have been interested in microscopy for very long time and the recent flurry of articles (io9.com, twitter, and telegraph.co.uk) showing very nice images further fueled my…Thu, 03 Jul 2014 00:00:00 GMTmicroscopyhttps://saurabhg.com/blog/sphdthesis-latex-template/https://saurabhg.com/blog/sphdthesis-latex-template/SPhdThesis is a latex document class for writing PhD thesis. I developed it while writing my PhD thesis in School of Computing (SoC), National University of Singapore (NUS). By…Sat, 31 May 2014 00:00:00 GMTlatex