User contributions for Zerpi
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A user with 10 edits. Account created on 25 January 2009.
7 October 2020
- 13:0413:04, 7 October 2020 diff hist +201 N User:Zerpi first version with some basic information about my background current
18 June 2019
- 07:4207:42, 18 June 2019 diff hist −1 m Contraction hierarchies →Querying: Typo (computer -> compute)
29 April 2018
- 08:1708:17, 29 April 2018 diff hist −12 m Image derivative →Sobel Derivatives
- 08:1608:16, 29 April 2018 diff hist 0 Image derivative →Sobel Derivatives: The signs were wrong and inconsistent with the idea of convolution.
- 08:1008:10, 29 April 2018 diff hist +75 Image derivative →Hast Derivatives: I reversed the columns in M so that d and k are the actual impulse responses with correct signs and consistent with the previous math. This removes the need to negate the first order derivatives in the last two lines
- 08:0108:01, 29 April 2018 diff hist +68 Image derivative →Farid and Simoncelli Derivatives: switched u and v back to be consistent with the rest of the article in which "u" seems to mean the vertical axis and v the horizonal axis.
- 07:4607:46, 29 April 2018 diff hist −30 Image derivative →Farid and Simoncelli Derivatives: The previous example code had the wrong sign, accidentally applied filter k more often than necessary which tends to smooth the image too much and use u for the derivative in Y and v for X instead of the other way around.
11 January 2011
5 January 2010
- 19:3419:34, 5 January 2010 diff hist +288 Talk:C++11 →C++1x?
