NativeScript OCR
⚠️ This repo is hardly maintained - if you want an OCR solution in NativeScript, please consider using Firebase MLKit.
Optical Character Recognition - powered by Tesseract
Installation
tns plugin add nativescript-ocr
Setup
You'll need to add language files to help Tesseract recognizing text in the images you feed it.
Download version 3.04.00 of the tessdata files here andadd your required language to the app/tesseract/tessdata/ folder of your app.
Note that if your language(s) has multiple files (like English: there's 9 files matching eng.*), copy all those files to the folder.
iOS
iOS searches for the tessdata folder in app/App_Resources/iOS, but instead of dulicating the folderyou can create a symbolic link:
cd app/App_Resources/iOS
ln -s ../../tesseract/tessdata
API
retrieveText
JavaScript
This is just a basic example using the default settings, look at the TypeScript code belowfor a more elaborate example.
var OCRPlugin = require("nativescript-ocr");
var ocr = new OCRPlugin.OCR();
ocr.retrieveText({
image: myImage
}).then(
function (result) {
console.log("Result: " + result.text);
},
function (error) {
console.log("Error: " + error);
}
);
TypeScript
This example shows how to use all possible (but optional) options you can pass into retrieveText:
import { OCR, RetrieveTextResult } from "nativescript-ocr";
import { ImageSource } from "image-source";
export Class MyOCRClass {
private ocr: OCR;
constructor() {
this.ocr = new OCR();
}
doRecognize(): void {
let img: ImageSource = new ImageSource();
img.fromFile("~/samples/scanned.png").then((success: boolean) => {
if (success) {
this.ocr.retrieveText({
image: img,
whitelist: "ABCDEF", // you can include only certain characters in the result
blacklist: "0123456789", // .. or you can exclude certain characters from the result
onProgress: (percentage: number ) => {
console.log(`Decoding progress: ${percentage}%`);
}
}).then(
(result: RetrieveTextResult) => {
this.set(HelloWorldModel.BUSY_KEY, false);
console.log(`Result: ${result.text}`);
}, (error: string) => {
console.log(`Error: ${err}`);
})
}
});
}
}
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重建ocr（recreate ocr） 没有备份的情况下如何重建ocr，mos上有比较详细的步骤，这里我只贴出我的语句和命令供参考 1.查看当前状态记录asm，database配置，如数据库名为orcl asm两个实例是+ASM1 [oracle@rac1 ~]$ crs_stat -t
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OCR 和 Voting disk 对RAC 来说是非常重要的。 OCR记录节点成员的配置信息,如database、ASM、instance、listener、VIP等CRS资源的配置信息。Voting disk记录节点成员信息，如包含哪些节点成员、节点的添加删除信息记录。在日常维护中需要对他们进行备份。当然OCR 也会自动备份。 当OCR或者Voting disk 出现问题时，有备份的话就使用备
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