移動(dòng)圖像開(kāi)發(fā)包LEADTOOLS iOS and OS X imaging SDK提供了創(chuàng)建跨平臺(tái)移動(dòng)圖像應(yīng)用的所有功能，如查看器、注釋、標(biāo)記、OCR、條形碼、PDF、圖像格式、壓縮和圖像處理等。 本文主要展示如何利用LEADTOOLS iOS庫(kù)的OCR功能識(shí)別文本并從圖像中讀取條碼。

獲得LEADTOOLS圖像

LEADTOOLS iOS庫(kù)通過(guò) LTRasterImage對(duì)象顯示和處理圖像。幸運(yùn)的是，LEADTOOLS只需要幾行代碼便可輕松地實(shí)現(xiàn)與iOS的互操作。

// Obtain the image from bundle, photo library or live capture
UIImage* uiImage = ...
// Convert UIImage to LTRasterImage using default options
LTRasterImage* rasterImage = [LTRasterImageConverter convertFromImage:uiImage
options:LTConvertFromImageOptions_None
error:nil];

獲取圖像后，接下使用LEADTOOLS 所提供的先進(jìn)的OCR和Barcode成像技術(shù)。

OCR示例

首先，創(chuàng)建一個(gè)LEADTOOLS OCR引擎實(shí)例。

// Create an instance of LEADTOOLS OCR engine
LTOcrEngine* ocrEngine = [LTOcrEngineManager createEngine:LTOcrEngineType_Advantage];

// Start up the engine with default parameters...
// We already added the OCR engine required language data files to the main bundle
NSString* bundlePath = [[NSBundle mainBundle] bundlePath];
[ocrEngine startup:nil workDirectory:nil startupParameters:bundlePath];

// Optionally, modify the settings for the OCR engine
// here (through ocrEngine.settingsManager)

接下來(lái)，我們創(chuàng)建一個(gè)新的OCR文檔并添加圖像：

// First create a document
LTOcrDocument* ocrDocument = [ocrEngine.documentManager createDocument];

// Add the image as a page into the document pages collection
LTOcrPage* ocrPage = [ocrDocument.pages addPageWithImage:rasterImage
target:nil
selector:nil
error:nil];

// You can add manual zones (text or graphics area)
// to the page at this point through the ocrPage.zones collection.
// In this example we will let the engine auto-zone the page for us.

最后，識(shí)別頁(yè)面獲取文本。

// Recognize it and print the results to the console
NSString* result = [ocrPage recognizeText:nil
selector:nil
error:nil];
printf("%s\n", result.UTF8String);

Barcode示例

首先，創(chuàng)建一個(gè)LEADTOOLS Barcode引擎實(shí)例。

// Create an instance of LEADTOOLS barcode engine
LTBarcodeEngine* barcodeEngine = [LTBarcodeEngine new];

// Get the barcode reader object
LTBarcodeReader* barcodeReader = barcodeEngine.reader;

// At this point, you can modify the barcode reading
// options (such as search direction, error checking, etc.)
// through the barcodeReader members. In this example we
// will leave everything as default.

接下來(lái)，我們將設(shè)置一些搜索選項(xiàng)，然后從圖像中讀取條形碼。

// Read the barcode in the image, first lets setup the options:
// The search location and size in the image, all of it
LeadRect searchBounds = LeadRect_Empty();

// Symbologies (barcode types such as UPC-A, UPC-E,
// QR, etc.) we are interested in, all of them
LTBarcodeSymbology* symbologies = nil;

// Call readBarcode
LTBarcodeData* barcodeData = [barcodeReader readBarcode:rasterImage
searchBounds:searchBounds
symbologies:symbologies
symbologiesCount:0
error:nil];

LTBarcodeData對(duì)象包含條碼信息，如類(lèi)型，價(jià)值和位置等。有了這些信息，你可以實(shí)現(xiàn)在線(xiàn)搜索價(jià)格或者訪(fǎng)問(wèn)條碼中所嵌入的Web頁(yè)面。

if (barcodeData != nil)
{
// We have a barcode
// Get the name of the symbology (type) such as UPC-A,
// UPC-E, QR, EAN, etc.
NSString* symbology = [LTBarcodeEngine getSymbologyFriendlyName:barcodeData.symbology];
// Get the location in the image
LeadRect bounds = barcodeData.bounds;
// Get a text representation of the data
NSString* value = barcodeData.value;

// Print the result to the console
NSString* result = [NSString stringWithFormat:
@"Found %@ barcode at %d,%d,%d,%d\nData: %@",
symbology,
bounds.x, bounds.y,
bounds.x + bounds.width,
bounds.y + bounds.height,
value];
printf("%s\n", result.UTF8String);
}
else
{
printf("No barcode found\n");
}