图像处理包LEADTOOLS v18示例：iOS OCR 和 Barcode识别

图像处理包LEADTOOLS v18示例：iOS OCR 和 Barcode识别

移动图像开发包LEADTOOLS iOS and OS X imaging SDK提供了创建跨平台移动图像应用的所有功能，如查看器、注释、标记、OCR、条形码、PDF、图像格式、压缩和图像处理等。 本文主要展示如何利用LEADTOOLS iOS库的OCR功能识别文本并从图像中读取条码。

获得LEADTOOLS图像

LEADTOOLS iOS库通过 LTRasterImage对象显示和处理图像。幸运的是，LEADTOOLS只需要几行代码便可轻松地实现与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];

获取图像后，接下使用LEADTOOLS 所提供的先进的OCR和Barcode成像技术。

OCR示例

首先，创建一个LEADTOOLS OCR引擎实例。

// 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)

接下来，我们创建一个新的OCR文档并添加图像：

// 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，识别页面获取文本。

// 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，创建一个LEADTOOLS Barcode引擎实例。

// 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.

接下来，我们将设置一些搜索选项，然后从图像中读取条形码。

// 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对象包含条码信息，如类型，价值和位置等。有了这些信息，你可以实现在线搜索价格或者访问条码中所嵌入的Web页面。

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");
}