我已将eng. traineddata文件正确包含到项目中。它工作正常。突然它开始给我以下错误和崩溃。
打开数据文件时出错 /var/mobile/Applications/B36E2682-933F-4B12-9B32-4C3F640BE19E/Documents/tessdata/eng.traineddata请确保将TESSDATA_PREFIX环境变量设置为"tessdata"目录的父目录。加载失败的语言'eng'Tesseract无法加载任何语言！
我使用的代码
- (NSString*) pathToLangugeFIle{
// Set up the tessdata path. This is included in the application bundle
// but is copied to the Documents directory on the first run.
NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentPath = ([documentPaths count] > 0) ? [documentPaths objectAtIndex:0] : nil;
NSString *dataPath = [documentPath stringByAppendingPathComponent:@"tessdata"];
NSFileManager *fileManager = [NSFileManager defaultManager];
// If the expected store doesn't exist, copy the default store.
if (![fileManager fileExistsAtPath:dataPath]) {
// get the path to the app bundle (with the tessdata dir)
NSString *bundlePath = [[NSBundle mainBundle] bundlePath];
NSString *tessdataPath = [bundlePath stringByAppendingPathComponent:@"tessdata"];
if (tessdataPath) {
[fileManager copyItemAtPath:tessdataPath toPath:dataPath error:NULL];
}
}
setenv("TESSDATA_PREFIX", [[documentPath stringByAppendingString:@"/"] UTF8String], 1);
return dataPath;
}
和
- (NSString*) OCRImage:(UIImage*)src{
// init the tesseract engine.
tesseract::TessBaseAPI *tesseract = new tesseract::TessBaseAPI();
tesseract->Init([[self pathToLangugeFIle] cStringUsingEncoding:NSUTF8StringEncoding], "eng");
tesseract->SetVariable("tessedit_char_whitelist", ":-0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ");
//Pass the UIIMage to cvmat and pass the sequence of pixel to tesseract
cv::Mat toOCR=[src CVGrayscaleMat];
NSLog(@"%d", toOCR.channels());
tesseract->SetImage((uchar*)toOCR.data, toOCR.size().width, toOCR.size().height
, toOCR.channels(), toOCR.step1());
tesseract->Recognize(NULL);
char* utf8Text = tesseract->GetUTF8Text();
return [NSString stringWithUTF8String:utf8Text];
}
// Copy the training data into the documents directory
NSArray* trainingDataSuffix = [NSArray arrayWithObjects:@"DangAmbigs",@"freq-dawg",@"inttemp",@"normproto",@"pffmtable",@"traineddata",@"unicharset",@"user-words",@"word-dawg",nil];
// Get the path to the resource files
NSString* bundlePath = [[NSBundle mainBundle] bundlePath];
// Hold a potential error
NSError* error = nil;
// Get the contents of the resource directory
NSArray* dirListing = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:bundlePath error:&error];
// Boolean to determine whether we have already created a directory or not
BOOL createdDirectory = NO;
// The path to the documents directory when appended with the tessdata folder
NSString* documentsDirectory = [[App getHiddenDocumentPath:@""] stringByAppendingPathComponent:@"tessdata"];
// Loop the resource files
for(NSString* file in dirListing)
{
// Loop the possible extensions we are looking for
for(NSString* extension in trainingDataSuffix)
{
// Check if the extension is one of these extensions we have been looking for
if([[file pathExtension] isEqualToString:extension])
{
// Check if we have created the directory
if(!createdDirectory)
{
// Create the directory
[[NSFileManager defaultManager] createDirectoryAtPath:documentsDirectory withIntermediateDirectories:YES attributes:nil error:&error];
// If we have an error tell us what it is
if(error != nil)
{
NSLog(@"Error: %@",error);
error = nil;
}
// If not, tell the loop we have created the directory so we don't have to do it again
else createdDirectory = YES;
}
// Get the path of the file in the tessdata directory
NSString* fileInDocumentsDir = [documentsDirectory stringByAppendingPathComponent:[file lastPathComponent]];
// Check if the file already exists
if(![[NSFileManager defaultManager] fileExistsAtPath:fileInDocumentsDir])
{
// If not, copy the file to the tessdata directory
[[NSFileManager defaultManager] copyItemAtPath:[bundlePath stringByAppendingPathComponent:file] toPath:fileInDocumentsDir error:&error];
// If we have an error tell us what it is
if(error != nil)
{
NSLog(@"Error: %@",error);
error = nil;
}
}
// We have found a valid extension, it's unlikely we'll find another so break the loop
break;
}
}
}
// set the environment variable TESSDATA_PREFIX to the path before the tessdata folder, in this case it's the documents directory
setenv("TESSDATA_PREFIX",[[App getHiddenDocumentPath:@""] UTF8String],1);
使用此代码将训练数据复制到资源路径。它现在工作正常。
来源-http://b2cloud.com.au/tutorial/tesseract-ocr-and-cross-compiling-on-ios/
