iOS,Android,Go,openCV

先说:最近准备做基于openCV的移动端人脸对比和识别,所以记录一下在过程中遇到的问题和解决办法,还有一些感想,文章随时更新,有问题希望大家可以多沟通交流

一写markdown上的不兼容,看着不习惯可以去 原文链接

1 选择&安装配置

1.1 首先 Go 的OpenVC两个版本的库

OpenCV2+

OpenCV3+

1.2 安装OpenCV(OpenCV3+)

依赖很多,安装时间很长,请准备好瓜子和板凳,直待GoCV安装完成

brew install hybridgroup/tools/opencv

运行以下命令获取GoCV库

go get -u -d gocv.io/x/gocv

切换到gocv文件夹下

cd $GOPATH/src/gocv.io/x/gocv

运行go run XX.go 选其中一个demo文件运行即可

1.2.1 But!! 你可能会遇到一个报错

go run: cannot run *_test.go files (video_test.go)

或

pkg-config --cflags -- opencv4
Package opencv4 was not found in the pkg-config search path. Perhaps you should add the directory containing `opencv4.pc' to the PKG_CONFIG_PATH environment variable No package 'opencv4' found pkg-config: exit status 1

你可以通过 brew install pkgconfig 解决

1.2.2 你还可能遇到Library not loaded

dyld: Library not loaded:glog啊或者gflags啊之类的

总之缺什么库啊引用缺失啊 ,你就导入什么就好了 brew install glog

1.2.3 运行成功

运行

cd $GOPATH/src/gocv.io/x/gocv
go run ./cmd/version/main.go

成功->输出

gocv version: 0.18.0
opencv lib version: 4.0.0

2 运行Demo

2.1 面部检测Demo 直接用goCV的Demo就好了,搞起来

<pre spellcheck="false" class="md-fences md-end-block ty-contain-cm modeLoaded" lang="go" contenteditable="false" cid="n166" mdtype="fences" style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-indent: 0px; text-transform: none; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none; box-sizing: border-box; overflow: visible; font-family: Monaco, Consolas, "Andale Mono", "DejaVu Sans Mono", monospace; margin-top: 0px; margin-bottom: 20px; background-image: inherit; background-size: inherit; background-attachment: inherit; background-origin: inherit; background-clip: inherit; background-color: rgb(54, 59, 64); font-size: 0.9rem; display: block; break-inside: avoid; text-align: left; white-space: normal; padding: 10px 30px; border: 1px solid; width: inherit; caret-color: rgb(184, 191, 198); color: rgb(184, 191, 198); position: relative !important;">import(

"fmt"

"image/color"

​

"gocv.io/x/gocv"

)

​

funcmain() {

// set to use a video capture device 0

deviceID:=0

​

// open webcam

webcam, err:=gocv.OpenVideoCapture(deviceID)

iferr!=nil{

fmt.Println(err)

return

}

deferwebcam.Close()

​

// open display window

window:=gocv.NewWindow("Face Detect")

deferwindow.Close()

​

// prepare image matrix

img:=gocv.NewMat()

deferimg.Close()

​

// color for the rect when faces detected

blue:=color.RGBA{0, 0, 255, 0}

​

// load classifier to recognize faces

classifier:=gocv.NewCascadeClassifier()

deferclassifier.Close()

​

if!classifier.Load("data/haarcascade_frontalface_default.xml") {

fmt.Println("Error reading cascade file: data/haarcascade_frontalface_default.xml")

return

}

​

fmt.Printf("start reading camera device: %v\n", deviceID)

for{

ifok:=webcam.Read(&img); !ok{

fmt.Printf("cannot read device %v\n", deviceID)

return

}

ifimg.Empty() {

continue

}

​

// detect faces

rects:=classifier.DetectMultiScale(img)

fmt.Printf("found %d faces\n", len(rects))

​

// draw a rectangle around each face on the original image

for_, r:=rangerects{

gocv.Rectangle(&img, r, blue, 3)

}

​

// show the image in the window, and wait 1 millisecond

window.IMShow(img)

window.WaitKey(1)

}

}</pre>

2.1.1 But!!!! 你可能会遇到报错

Error reading cascade file: data/haarcascade_frontalface_default.xml 路径不对,问题代码行数 if !classifier.Load("data/haarcascade_frontalface_default.xml") { 替换load路径为你的opencv的路径$GOPATH/src/gocv.io/x/gocv/data/haarcascade_frontalface_default.xml

3.打包go文件为静态.a包

安装gomobile go get golang.org/x/mobile/cmd/gomobile 需要翻墙

然后安装 gomobile init 绑定 go get -d golang.org/x/mobile/example/bind/...

最后生成gomobile的生成.a的测试包helpDemo,以iOS为例子

cd $GOPATH/src/golang.org/x/mobile/example/bind

gomobile bind -target=ios golang.org/x/mobile/example/bind/hello 因为gomobile在生成.framework时,调用了CommandLineTools,所以你需要在MacOS上安装CommandLineTools,或者Xcode

But!!!!!即使你安装了CommandLineTools或者Xcode也还是会有可能会报出 gomobile: -target=ios requires XCode 的错误,我理解[图片上传失败...(image-81b24c-1544679956585)]

是因为gomobile实现的xcrun找不到你的CommandLineTools,路径错误,解决:

sudo xcode-select -r

xcode-select --help

Options:
-h, --help print this help message and exit
-p, --print-path print the path of the active developer directory
-s <path>, --switch <path> set the path for the active developer directory
--install open a dialog for installation of the command line developer tools
-v, --version print the xcode-select version
-r, --reset reset to the default command line tools path