Articles by YvesDaoust (Articles: 2, Tip/Tricks: 10)

Articles: 2, Tip/Tricks: 10

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C++	Fast stepwise rotation 21 Apr 2012 Updated: 22 Apr 2012 Rating: 4.91/5 Votes: 13 Popularity: 5.47 Licence: CPOL Views: 28,045 Bookmarked: 27 Downloaded: 0 Please Sign up or sign in to vote. We study the problem of computing R cos(a + k b) and R sin(a + k b) for increasing k
Visual Basic	Perspective Projection of a Rectangle (Homography) 26 Oct 2013 Updated: 26 Oct 2013 Rating: 4.93/5 Votes: 10 Popularity: 4.93 Licence: CPOL Views: 41,379 Bookmarked: 10 Downloaded: 1,752 Please Sign up or sign in to vote. Short study of the perspective projection of a rectangle in space; homography opposed to bilinear transform

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Algorithms	Fast floor/ceiling functions [Tip/Trick] 23 Dec 2013 Updated: 24 Dec 2013 Rating: 4.64/5 Votes: 7 Popularity: 3.92 Licence: CPOL Views: 48,370 Bookmarked: 11 Downloaded: 0 Please Sign up or sign in to vote. Yet another home-made implementation of the floor function
Programming Languages
C	How to zero your memory? [Tip/Trick] 9 Aug 2011 Updated: 9 Aug 2011 Rating: 5.00/5 Votes: 1 Popularity: 0.00 Licence: CPOL Views: 11,110 Bookmarked: 0 Downloaded: 0 Please Sign up or sign in to vote. What about this, using SSE2 assembly (32 bits):void Zero(void* Buffer, int Count){ char* Cur= (char)Buffer; char End= (char)Buffer + Count; // Clear the initial unaligned bytes while (Cur < End && (Cur - (char)0) & 0xf) { *Cur++= 0; } // Clear...
C#	See if a Flags enum is valid [Tip/Trick] 16 May 2011 Updated: 16 May 2011 Rating: 0.00/5 Votes: 0 Popularity: 0.00 Licence: CPOL Views: 4,400 Bookmarked: 0 Downloaded: 0 Please Sign up or sign in to vote. // A faster solutionreturn (value & mask) == 0;// Where mask == ~ (None \| One \| Eight)// This constant can be precomputed at compile-time or run-time (like in Alternate 1)
	Translating a jagged array [Tip/Trick] 13 Dec 2011 Updated: 13 Dec 2011 Rating: 1.80/5 Votes: 2 Popularity: 0.54 Licence: CPOL Views: 7,310 Bookmarked: 0 Downloaded: 0 Please Sign up or sign in to vote. array= new int[4][] { new int[] { 5, 1, 0, 0, 0 }, new int[] { 6, 2, 0, 1, 0 }, new int[] { 7, 3, 0, 0, 0 }, new int[] { 0, 4, 0, 0, 0 },};1341 keystrokes spared.
	Writing Registry using C# [Tip/Trick] 13 Dec 2011 Updated: 13 Dec 2011 Rating: 5.00/5 Votes: 1 Popularity: 0.00 Licence: CPOL Views: 7,280 Bookmarked: 0 Downloaded: 0 Please Sign up or sign in to vote. http://msdn.microsoft.com/en-us/library/h5e7chcf.aspx[^]
	Convert RGB to Gray Scale without using Pointers [Tip/Trick] 17 Jan 2012 Updated: 17 Jan 2012 Rating: 0.00/5 Votes: 0 Popularity: 0.00 Licence: CPOL Views: 14,420 Bookmarked: 1 Downloaded: 0 Please Sign up or sign in to vote. You shouldn't rely on methods from the .NET classes (Bitmap::SetPixel, Bitmap::GetPixel, Color::FromArgb) in the inner loop as these are called intensively, million times per image, and their implementation are opaque to you.If their implementation is opaque to the compiler too, no code...
	Natural Logarithms and Exponent [Tip/Trick] 17 Jan 2012 Updated: 17 Jan 2012 Rating: 5.00/5 Votes: 1 Popularity: 0.00 Licence: CPOL Views: 9,380 Bookmarked: 2 Downloaded: 0 Please Sign up or sign in to vote. You should be delighted by the CORDIC approach to elementary functions computation.http://drdobbs.com/184404244[^]log10(x){ z = 0; for ( i=1; i= 1) x = x - x2^(-i); z = z - log10(1-2^(-i)); else x = x + x2^(-i); ...
	Convert RGB to Gray Scale without using Pointers [Tip/Trick] 18 Jan 2012 Updated: 18 Jan 2012 Rating: 0.00/5 Votes: 0 Popularity: 0.00 Licence: CPOL Views: 7,520 Bookmarked: 1 Downloaded: 0 Please Sign up or sign in to vote. A piece of warning, though: the LockBits method is not a transparent one, it does image format conversion before returning a pointer to the bitmap (this is why it has a PixelFormat argument). And conversely, the UnlockBits method converts back to the original format. My best guess is that when...
C++	A simple program to solve quadratic equations with [Tip/Trick] 9 Nov 2010 Updated: 9 Nov 2010 Rating: 4.00/5 Votes: 1 Popularity: 0.00 Licence: CPOL Views: 6,661 Bookmarked: 2 Downloaded: 0 Please Sign up or sign in to vote. // Real solutions of the quadratic equation A x^2 + B x + C = 0// Returns two roots (possibly identical) in increasing order, or nonebool Quadratic(double A, double B, double C, double R[2]){ if (A == 0) { // Linear, impossible or degenerate, cannot find two roots ...
Python	Faulhaber made easy [Tip/Trick] 2 Jul 2014 Updated: 2 Jul 2014 Rating: 4.47/5 Votes: 5 Popularity: 3.12 Licence: CPOL Views: 18,712 Bookmarked: 6 Downloaded: 2 Please Sign up or sign in to vote. Computation of the Faulhaber polynomials coefficients

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YvesDaoust

CEO VISION fOr VISION

Belgium

I fell into applied algorithmics at the age of 16 or so. This eventually brought me to develop machine vision software as a professional. This is Dreamland for algorithm lovers.