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2015-06-17 08:52:35 -0600 | answered a question | opencv 3.0 with android nkd - undefined reference to 'std::__throw_out_of_range_fmt(char const*, ...)' I'm getting the same error. The cause is that they chose to switch the toolchain they built the libraries with from gcc-4.8 to gcc-4.9 from 3.0.0-rc1 to 3.0.0 final. Try forcing your NKD build to use GCC 4.9 instead of the default 4.8. See also http://code.opencv.org/issues/4398 |
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2015-06-02 06:49:44 -0600 | commented question | Optimized (SSE/NEON) methods: algorithm executed twice? @berak, you're right. The loop counters are initialized before the #ifdef and are not re-initialized at the loops of the generic code. Neat one :) If you'd written that as answer, I were able to accept it ;D |
2015-06-02 06:46:47 -0600 | received badge | ● Editor (source) |
2015-06-02 06:43:01 -0600 | asked a question | Optimized (SSE/NEON) methods: algorithm executed twice? This is not about OpenCV-usage but related to OpenCV-code itself. I just had a short look at the method "int normHamming(const uchar* a, int n)" defined in "modules/hal/src/stat.cpp" (line 83 of current git master). Let's assume CV_NEON is defined. In that case, the code inside the curly braces after the #ifdef is executed. However, since there is no return (and no "else" for the code after), the code below/after is ALSO executed. If CV_NEON were not defined, only the unoptimized code were executed. This seems to me as if the algorithm is first executed via NEON (optimized) and then again via the generic implementation? This also applies to more methods in the same file (example: "int normL1_(const uchar* a, const uchar* b, int n)" in line 258) and also methods in other files. Is this a bug or is there an explanation? |
2015-06-02 06:43:01 -0600 | commented answer | Is there any official IRC for OpenCV? +1. Direct questions that can be resolved/answered and possibly are only valid for a short time and might not be a bug in the code can be solved very quickly via IRC. |