Changes between Version 27 and Version 28 of VisionFramework

Timestamp:

Nov 24, 2017, 11:26:10 AM (7 years ago)

Author:

benjialbert

Comment:

--

VisionFramework

@@ -169 +169 @@
 mkdir build
 cd build
-cmake -DCMAKE_RELEASE_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr/local -DBUILD_SHARED_LIBS=OFF ..
+cmake -DCMAKE_RELEASE_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr/local -DBUILD_SHARED_LIBS=OFF -DWITH_FFMPEG=OFF..
 make -j $[$(nproc)+1]
 sudo make install
 }}}
+
+This builds a single shared object file (libopencv_java320.so), a jar file (opencv-320.jar) and a ton of static libraries (*.a)[[BR]]
+It copies the shared object file and the jar file to the install directory: {{{/usr/local/share/OpenCV/java/...}}}[[BR]]
+
+NOTE: we could not get the java wrapper to work with ffmpeg enabled (we ran into a Segmentation fault with opencv libs 3.2.0, 3.3.0, and 3.3.1).  We gave up and disabled it.[[BR]]
+
+If you do not want to git clone the master opencv repository, download a zipped version:
+[https://github.com/opencv/opencv/archive/3.2.0.zip opencv-3.2.0.zip][[BR]]
+
+==== Java Projects with OpenCV ====
+===== Enable VideoCapture =====
+First, to allow OpenCV VideoCapture to access the ribbon cable camera, run the following command:
+{{{
+sudo modprobe bcm2835-v4l2
+}}}
+
+===== Compiling =====
+{{{
+javac -d <build_path> -classpath <external_jars> <source_path>/*.java
+}}}
+
+where:
+* {{{build_path = directory to store class files}}}
+* {{{external_jars = string specifying individual jar dependencies (such as OpenCV and Pi4J) with delimiters as follows:}}}
+ * {{{:/path_to_jars/jar1.jar:/path_to_jars/jar2.jar}}}
+* {{{souce_path = directory containing all of your java files to be compiled}}}
+
+We recommend creating a {{{libs}}} folder in which you store all of your external jars such as the {{{opencv-320.jar}}} and all the Pi4J jars rather than having your libraries scattered all over your machine.
+
+===== Running =====
+{{{
+sudo java -Djava.library.path=<opencv_install_path> -Dpi4j.debug -Dpi4j.linking=dynamic -classpath <external_jars> <Main_class>
+}}}
+
+where:
+* {{{external_jars = same string that you used in the Compilation step}}}
+* {{{Main_class = name of the class file with main method}}}
+ * For example, where {{{Vision.class}}} is the class file, {{{Main_class = Vision}}}