Compile
OpenCV:src is not a numerical tuple
Try:
_,h = cv2.threshold(h, 245, 1, cv2.THRESH_BINARY) #245-255 x>245 y=1
_,s = cv2.threshold(h, 15, 1, cv2.THRESH_BINARY_INV) #1-15,x>15 y=0
cv2.threshold returns two values:
1.为什么会出现这种错误？
2.出现这种错误的解决方法？
3.哪种方法最好，为什么？
4.联想自己遇到过的类似问题，比较、思考、总结。
相信你这样子会走得更远。
g++ test.cpp -o out `pkg-config --cflags --libs opencv` (note: ` is character on upper left of keyboard)
添加环境变量
g++ -I /usr/local/include -L /usr/local/lib test.cpp -o out -lopencv_world (note: library file name: libopencv_world.so)
32/64 位系统编译在32位系统上运行 => x86
32 系统上编译64位系统上运行 => x86_amd64
64 系统上编译在64位系统上运行 => amd64
（http://blog.csdn.net/wl2002200/article/details/52984241）
CC stands for "C compiler" (in GCC abbreviation it is also treated as "compiler collection").
LD is a linker (comes from "link editor" or from "loader").
These are also commonly used in makefiles (see Implicit variables chapter of GNU Make manual):
CPP stands for "C preprocessor"
CXX is a C++ compiler
AS is an assembly language compiler
AR is an archive-maintaining program
openCV cross compile
1. 3rd library cross compile: add build option for them
AFAICT the ctype_base class isn't provided by uClibc.
vi CMakeCache.txt
将所有“CMAKE_EXE_LINKER_FLAGS:STRING=”加上选项
修改后： CMAKE_EXE_LINKER_FLAGS:STRING=-lpthread -lrt -ldl
-ldl选项for:
lib/libopencv_core.so: undefined reference to `dlopen'
lib/libopencv_core.so: undefined reference to `dlsym'
to be check: -DWITH_LAPACK=OFF
Sample 的make命令执行如下：
g++ -Wall -g -fPIC -std=gnu++11 -DLINUX -I/usr/local/include/gti -I/usr/local/GTISDK/Lib/Linux/OpenCV -c Sample.cpp -o Sample.o
g++ -Wall -g -fPIC -std=gnu++11 -DLINUX -I/usr/local/include/gti -I/usr/local/GTISDK/Lib/Linux/OpenCV -c Samples.cpp -o Samples.o
g++ -Wall -g -fPIC -std=gnu++11 -DLINUX -I/usr/local/include/gti -I/usr/local/GTISDK/Lib/Linux/OpenCV -c Classify.cpp -o Classify.o
g++ -Wall -g -fPIC -std=gnu++11 -DLINUX -L/usr/local/Lib -o cnnSample Sample.o Samples.o Classify.o -lopencv_world -lGTILibrary-static -lftd3xx -lpthread -lX11
bulid INSTALL工程时，发生如下错误：
error MSB3073: The command "setlocal
E:\cmake3.0.0\CMake\bin\cmake.exe -DBUILD_TYPE=Debug -P cmake_install.cmake
if %errorlevel% neq 0 goto :cmEnd
:cmEnd
endlocal & call :cmErrorLevel %errorlevel% & goto :cmDone
:cmErrorLevel
exit /b %1
:cmDone
if %errorlevel% neq 0 goto :VCEnd
:VCEnd" exited with code 1. C:\Program Files (x86)\MSBuild\Microsoft.Cpp\v4.0\V120\Microsoft.CppCommon.targets 132 5 INSTALL
查看输出信息发现是由于VS2013没有权限：
解决方法：以管理员身份运行VS2013
a value of type “const char *” cannot be assigned to an entity of type “char” C OOP
C++ has two types of constants consisting of characters - string literals and character literals.
String literals are enclosed in double quotes, and have type of const char *
Character literals are enclosed in single quotes, and have type char.
argument of type "char *" is incompatible with parameter of type "LPCWSTR"
Set Project -> Properties -> General -> Character Set option to Use Multi-Byte Character Set