人工智能ocr文字识别源程序,vb编写的,不得不服,没

人工智能ocr文字识别源程序,vb编写的,不得不服,没,第1张

stream.close()

inStream.close()

text.setText(stream.toString())

Toast.makeText(MyActivity.this,"Loaded",Toast.LENGTH_LONG).show()

} catch (FileNotFoundException e) {

e.printStackTrace()

}

catch (IOException e){

return

}

}

要编译Android平台的Tesseract,需要使用Google提供的睁塌兆tesseract-android-tools。

代码获取方式:

git clone https://code.。google.com/p/tesseract-android-tools/

打开README,在命令行工具中执行下面的步骤:

cd <project-directory>

curl -O https://tesseract-ocr。googlecode.。com/files/tesseract-ocr-3.02.02.tar.gz

curl -O http://leptonica。googlecode。com/files/leptonica-1.69.tar.gz

tar -zxvf tesseract-ocr-3.02.02.tar.gz

tar -zxvf leptonica-1.69.tar.gz

rm -f tesseract-ocr-3.02.02.tar.gz

rm -f leptonica-1.69.tar.gz

mv tesseract-3.02.02 jni/com_googlecode_tesseract_android/src

mv leptonica-1.69 jni/com_googlecode_leptonica_android/src

ndk-build -j8

android update project --target 1 --path .

ant debug (release)

注意:如果你在使用NDK r9,编译的时候会出现错误:

format not a string literal and no format arguments [-Werror=format-security]

解决的方法就是在Application.mk中加入一行:

APP_CFLAGS += -Wno-error=format-security

编译之后会生成class.jar和一些*.so。

Android OCR Application

创建一个Android应用,把生成的jar和so导入进来。

创建TessOCR:

public class TessOCR {

private TessBaseAPI mTess

public TessOCR() {

// TODO Auto-generated constructor stub

mTess = new TessBaseAPI()

String datapath = Environment.getExternalStorageDirectory() + "/tesseract/"

String language = "eng"

File dir = new File(datapath + "tessdata/")

if (!dir.exists())

dir.mkdirs()

mTess.init(datapath, language)

}

public String getOCRResult(Bitmap bitmap) {

mTess.setImage(bitmap)

String result = mTess.getUTF8Text()

return result

}

public void onDestroy() {

if (mTess != null)

mTess.end()

}

}

构造函数中需要在存储卡上悉租创建一个目录tessdata,如果不衫姿创建程序运行就会出错。因为源码中会检测这个目录,不存在就抛出异常:

public boolean init(String datapath, String language) {

if (datapath == null) {

throw new IllegalArgumentException("Data path must not be null!")

}

if (!datapath.endsWith(File.separator)) {

datapath += File.separator

}

File tessdata = new File(datapath + "tessdata")

if (!tessdata.exists() || !tessdata.isDirectory()) {

throw new IllegalArgumentException("Data path must contain subfolder tessdata!")

}

return nativeInit(datapath, language)

}

就这么简单。现在通过三种方式获取图片做OCR:

图库中选取一张图,选择发送或者分享,选择OCR应用

在AndroidManifest.xml中加入IntentFilter,让OCR应用出现在图库的分享列表中:

<intent-filter>

<action android:name="android.intent.action.SEND" />

<category android:name="android.intent.category.DEFAULT" />

<data android:mimeType="text/plain" />

<data android:mimeType="image/*" />

</intent-filter>

获得URI之后,对URI解码,获取bitmap:

if (Intent.ACTION_SEND.equals(intent.getAction())) {

Uri uri = (Uri) intent.getParcelableExtra(Intent.EXTRA_STREAM)

uriOCR(uri)

}

private void uriOCR(Uri uri) {

if (uri != null) {

InputStream is = null

try {

is = getContentResolver().openInputStream(uri)

Bitmap bitmap = BitmapFactory.decodeStream(is)

mImage.setImageBitmap(bitmap)

doOCR(bitmap)

} catch (FileNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace()

} finally {

if (is != null) {

try {

is.close()

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace()

}

}

}

}

}

启动OCR应用,从图库中选择一张图做OCR

发送Intent调用图库,在onActivityResult中获取返回的URI做OCR:

Intent intent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI)

startActivityForResult(intent, REQUEST_PICK_PHOTO)

启动OCR应用,拍照之后做OCR

为了获取高质量的图片,在Intent中加入图片路径。返回之后就可以直接使用这个图片路径解码:

private void dispatchTakePictureIntent() {

Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE)

// Ensure that there's a camera activity to handle the intent

if (takePictureIntent.resolveActivity(getPackageManager()) != null) {

// Create the File where the photo should go

File photoFile = null

try {

photoFile = createImageFile()

} catch (IOException ex) {

// Error occurred while creating the File

}

// Continue only if the File was successfully created

if (photoFile != null) {

takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT,

Uri.fromFile(photoFile))

startActivityForResult(takePictureIntent, REQUEST_TAKE_PHOTO)

}

}

}

最后不要忘记下载语言包,并push到存储卡的tessdata目录下。


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原文地址: https://outofmemory.cn/yw/12270501.html

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