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我正在尝试将位图传递给 tesseract 以获取读取的字符。我以这种方式编写了代码：

TessBaseAPI baseApi = new TessBaseAPI();
baseApi.setImage(ReadFile.readBitmap(charscropped));
String capturedChars = baseApi.getUTF8Text(); // app crashes in this line

这里缺少什么？

日志输出：

11-03 15:00:54.473: E/AndroidRuntime(5674): FATAL EXCEPTION: main
11-03 15:00:54.473: E/AndroidRuntime(5674): java.lang.NullPointerException
11-03 15:00:54.473: E/AndroidRuntime(5674):     at com.googlecode.tesseract.android.TessBaseAPI.getUTF8Text(TessBaseAPI.java:409)
11-03 15:00:54.473: E/AndroidRuntime(5674):     at com.elottery.ocr.Test$4.onClick(Test.java:110)
11-03 15:00:54.473: E/AndroidRuntime(5674):     at android.view.View.performClick(View.java:3567)
11-03 15:00:54.473: E/AndroidRuntime(5674):     at android.view.View$PerformClick.run(View.java:14224)
11-03 15:00:54.473: E/AndroidRuntime(5674):     at android.os.Handler.handleCallback(Handler.java:605)
11-03 15:00:54.473: E/AndroidRuntime(5674):     at android.os.Handler.dispatchMessage(Handler.java:92)
11-03 15:00:54.473: E/AndroidRuntime(5674):     at android.os.Looper.loop(Looper.java:137)
11-03 15:00:54.473: E/AndroidRuntime(5674):     at android.app.ActivityThread.main(ActivityThread.java:4517)
11-03 15:00:54.473: E/AndroidRuntime(5674):     at java.lang.reflect.Method.invokeNative(Native Method)
11-03 15:00:54.473: E/AndroidRuntime(5674):     at java.lang.reflect.Method.invoke(Method.java:511)
11-03 15:00:54.473: E/AndroidRuntime(5674):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:993)
11-03 15:00:54.473: E/AndroidRuntime(5674):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:760)
11-03 15:00:54.473: E/AndroidRuntime(5674):     at dalvik.system.NativeStart.main(Native Method)
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2 回答 2

1

错误不在该行中，而是在上面的行中。将 Bitmap 的对象直接传递给 baseApi.setImage();

例如：-

位图 bmp；
然后将图像存储在 bmp
baseApi.setImage(bmp);

它对我有用。

于 2013-11-27T12:44:27.570 回答
0

在参考了 Gautam Gupta 的博客后，我得到了这个工作：http: //gaut.am/making-an-ocr-android-app-using-tesseract/

问题是语言文件丢失了，我手动将它们放在手机 SD 卡中。以下是代码行：

TessBaseAPI baseApi = new TessBaseAPI();
baseApi.init("/mnt/sdcard/tesseract", "eng"); 
baseApi.setImage(ReadFile.readBitmap(charscropped));
String capturedChars = baseApi.getUTF8Text();
于 2013-11-03T15:59:01.087 回答