chris-piekarski

alias randman='dir="/bin"; man $(ls $dir |sed -n "$(echo $(( $RANDOM % $(ls $dir |wc -l | awk "{ print $1; }" ) + 1 )) )p")'

chris-piekarski

This is a note on how to cross compile opencv for pretty much any ARM device(HardFP supported in this case) and deploy. Native
compiling in ARM devices can be painfully slow and they seem to hang often during build(mine got stuck at 43%). So if you happen
to have a desktop/laptop/server running ubuntu or similar linux distro, u can build opencv in fractionth of the time taken for 
native compiling without any issues.
Building opencv3 with TBB and NEON and VFP support can boost opencv performance. Thanks to Adrian at pyimagesearch for pointing 
that out.
Both my PC and target machine aka orange pi zero are running ubuntu 16.04 with python2.7 and python 3.5.
Let us use the term "build machine" for your PC where you are building opencv and "target machine" for the ARM single board computer.

1.Run the following commands in both machines(I think installing these in target machine only would do) to install the necessary libraries etc.(mine worked with them,so they should be enough 

chris-piekarski

repo forall -c 'echo $REPO_PROJECT $REPO_PATH'


platform/abi/cpp abi/cpp
platform/bionic bionic
device/fsl/bootloader/uboot bootable/bootloader/uboot-imx
platform/bootable/recovery bootable/recovery
platform/build build
platform/cts cts
platform/dalvik dalvik

chris-piekarski

find . -maxdepth 1 -type d \( ! -name . \) -exec bash -c "cd '{}' && git pull" \;

chris-piekarski

1/30/2019

Python 2.7.12 (default, Nov 12 2018, 14:36:49) 
[GCC 5.4.0 20160609] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import rglob
>>> rglob.lcount("/media/chris/UBNT/tensorFlowExample/tensorflow","*.py")
3268693
>>> rglob.lcount("/media/chris/UBNT/tensorFlowExample/tensorflow","*.java")
245116

chris-piekarski

Add your index.html file to res/raw

Add dep to app gradle file:

    dependencies {
        implementation 'org.nanohttpd:nanohttpd-webserver:2.3.1'
    }

Java class file:
    import fi.iki.elonen.NanoHTTPD;

chris-piekarski

#create patches from author(s) into one without comments
#good for GPLv2 sharing
for c in `git log --format=format:%H --author=chris`;do git format-patch --stdout --format=format:%H --no-stat -1 $c;done | tee stuff.patch

chris-piekarski

for f in ./*.*;do convert -resize 1280x720 $f ./720p/$f; done

chris-piekarski

repo forall -c git log --grep="partition" --author=Chris
repo forall -c 'echo $REPO_PATH; git log --grep "partition" --author=Chris'

chris-piekarski

//1ms but uses file cache so not updated quickly
try {
    String inputLine;
    FileReader file = new FileReader("/sys/class/power_supply/battery/current_now");
    BufferedReader bufferedReader = new BufferedReader(file);
    inputLine = bufferedReader.readLine();
    text = inputLine;
    bufferedReader.close();
    file.close();
} catch (Exception e) {