Stefano Tommesani

41. AskWatch: navigation

After adding your kid, AskWatch will start grabbing data about your son for a few seconds, or a bit more depending on the speed of your internet connection. In the main window, a new tab with the name of your son will be added, and the new screen...

Wednesday, 07 August 2013 | Print | PDF | Read more

42. On bad web interfaces

Today I have encountered the following error message in a major web site: However: there was no warning on the web page about this limitation (e.g. "type up to 3000 chars") there was no warning while typing that I was entering too much...

Saturday, 20 July 2013 | Print | PDF | Read more

43. Returning buffers with C++ and Boost

In the article comparing CPU and GPU implementations of the median filter, the class was designed to receive image buffers with the AddSample method and return a pointer to the image buffer with the GetMedianImage method: class TM_CPURefImpl : ...

Monday, 03 June 2013 | Print | PDF | Read more

44. Quexal MMX goes freeware

Back in 2000, Quexal changed the way programmers had to deal with MMX programming. A friendly user interface simplified building parallel versions of algorithms, an optimizing compiler made sure that the resulting code would run fast, and a visual...

Saturday, 01 June 2013 | Print | PDF | Read more

45. AltaCdCover - convert CD covers

Quickly convert a digipak CD cover into a traditional jewel-box CD back cover! Just drop the CD cover to convert into the source area, AltaCdCover will automatically recognize if it contains both front and back sides or only the back side, drop...

Saturday, 01 June 2013 | Print | PDF | Read more

46. An object-oriented approach to FizzBuzz

FizzBuzz is described as: Write a program that prints the integers from 1 to 100. But for multiples of three print "Fizz" instead of the number and for the multiples of five print "Buzz". For numbers which are multiples of both three and five...

Monday, 27 May 2013 | Print | PDF | Read more

47. SSE2 Intrinsics

Floating-Point Intrinsics Arithmetic Operation Intrinsics Intrinsic name Corresponding instruction Operation R0 value R1 value _mm_add_sd ADDSD Adds a0 [op] b0 a1 ...

Monday, 27 May 2013 | Print | PDF | Read more

48. MMX Intrinsics

General Support Intrinsics Intrinsic name Operation Signed Saturation Assembly instruction _mm_empty Empties MM state Not applicable Not applicable EMMS _mm_cvtsi32_si64 Converts from int Not applicable Not...

Monday, 27 May 2013 | Print | PDF | Read more

49. SSE Intrinsics

Packed Arithmetic Intrinsics Intrinsic Instruction Operation R0 R1 R2 R3 _mm_add_ss ADDSS Adds a0 [op] b0 a1 a2 ...

Monday, 27 May 2013 | Print | PDF | Read more

50. Comparing SSE2 and GPGPU C++ AMP

The temporal median algorithm compares the same pixel in consecutive images in a sequence, and returns the median value of the pixel, i.e. the pixel value that has the same number of lower and higher values (an easy way to visualize this is imaging...

Tuesday, 21 May 2013 | Print | PDF | Read more

51. Comparing SSE2 and GPGPU C++AMP

70

Monday, 20 May 2013 | Print | PDF

52. Spidering Facebook public profiles with C++ and Boost

Back in 2010, security researcher Ron Bowes wrote a Ruby script that downloads information from Facebook's user directory, a searchable index of public profile pages. The directory did not expose a user's entire profile and only exposed...

Friday, 17 May 2013 | Print | PDF | Read more

53. AltaLux: new major release

AltaLux is an image processing technology that can significantly enhance the quality of images and videos with poor lighting conditions. AltaLux/Demo is a Windows sample application that lets you enhance the quality of JPEG images for free...

Friday, 03 May 2013 | Print | PDF | Read more

54. Different types of parallel loops with SSE2, SSSE3 and Visual C++ 2012

32

Wednesday, 01 May 2013 | Print | PDF

55. Multi-thread loops with Intel TBB

A new article about using Intel TBB is here. It contains examples using C++ lambdas and joining multi-threaded loops with SIMD code In this article we will transform a plain C loop into a multi-threaded version using Intel Thread Building Blocks...

Wednesday, 01 May 2013 | Print | PDF | Read more

56. Different types of parallel loops with Intel TBB, SSE2, SSSE3 and Visual C++ 2012

This is not the first article on this site that discusses how to use the Intel Thread Building Blocks library to spread the computation of an image-processing kernel over multiple threads: the article named "Multi thread loops with Intel TBB" showed...

Wednesday, 01 May 2013 | Print | PDF | Read more

57. SSE2 64-bit FP instructions

In the introduction we have outlined the applications that require 64-bit precision, scientific simulations and CAD/CAM being notable examples. However, the transition from normal scalar code to 64-bit floating-point SSE2 code is complex and it...

Friday, 26 April 2013 | Print | PDF | Read more

58. SSE2 and MMX

I’'m quite sure that Intel would not like to see SSE2 named 128-bit MMX. In fact, MMX has a bad reputation: the Intel marketing hype pushed it as an universal solution to multimedia requirements, but at the same time the gaming industry switched...

Friday, 26 April 2013 | Print | PDF | Read more

59. 3DNow!

The latest trend in PC games is 3D graphics: during the past few years, almost all kinds of games have turned to 3D graphics, greatly increasing the demand of processors with strong floating-point performance, because the front end of a typical...

Friday, 26 April 2013 | Print | PDF | Read more

60. SSE Introduction

The Streaming SIMD Extensions enhance the Intel x86 architecture in four ways: 8 new 128-bit SIMD floating-point registers that can be directly addressed; 50 new instructions that work on packed floating-point data; 8...

Friday, 26 April 2013 | Print | PDF | Read more