Swift 3-如何提高Tesseract的图像质量? [英] Swift 3 - How do I improve image quality for Tesseract?
问题描述
我正在使用Swift 3构建一个移动应用程序,该应用程序允许用户拍照并在生成的图像上运行Tesseract OCR.
I am using Swift 3 to build a mobile app that allows the user to take a picture and run Tesseract OCR over the resulting image.
但是,我一直在尝试提高扫描质量,但似乎效果不佳.我已将照片分割成我想识别的放大"区域,甚至尝试将其设为黑白.是否有增强"或优化图片质量/尺寸的策略,以便Tesseract可以更好地识别它?谢谢!
However, I've been trying to increase the quality of scan and it doesn't seem to be working much. I've segmented the photo into a more "zoomed in" region that I want to recognize and even tried making it black and white. Are there any strategies for "enhancing" or optimizing the picture quality/size so that Tesseract can recognize it better? Thanks!
tesseract.image = // the camera photo here
tesseract.recognize()
print(tesseract.recognizedText)
我遇到了这些错误,不知道该怎么办:
I got these errors and have no idea what to do:
Error in pixCreateHeader: depth must be {1, 2, 4, 8, 16, 24, 32}
Error in pixCreateNoInit: pixd not made
Error in pixCreate: pixd not made
Error in pixGetData: pix not defined
Error in pixGetWpl: pix not defined
2017-03-11 22:22:30.019717 ProjectName[34247:8754102] Cannot convert image to Pix with bpp = 64
Error in pixSetYRes: pix not defined
Error in pixGetDimensions: pix not defined
Error in pixGetColormap: pix not defined
Error in pixClone: pixs not defined
Error in pixGetDepth: pix not defined
Error in pixGetWpl: pix not defined
Error in pixGetYRes: pix not defined
Please call SetImage before attempting recognition.Please call SetImage before attempting recognition.2017-03-11 22:22:30.026605 EOB-Reader[34247:8754102] No recognized text. Check that -[Tesseract setImage:] is passed an image bigger than 0x0.
推荐答案
我已使用以下方法在swift 3中相当成功地使用了tesseract:
ive been using tesseract fairly successfully in swift 3 using the following:
func performImageRecognition(_ image: UIImage) {
let tesseract = G8Tesseract(language: "eng")
var textFromImage: String?
tesseract?.engineMode = .tesseractCubeCombined
tesseract?.pageSegmentationMode = .singleBlock
tesseract?.image = imageView.image
tesseract?.recognize()
textFromImage = tesseract?.recognizedText
print(textFromImage!)
}
我还发现对图像进行预处理也有帮助.我在UIImage中添加了以下扩展名
I also found pre-processing the image helped too. I added the following extension to UIImage
导入UIKit 导入CoreImage
import UIKit import CoreImage
extension UIImage {
func toGrayScale() -> UIImage {
let greyImage = UIImageView()
greyImage.image = self
let context = CIContext(options: nil)
let currentFilter = CIFilter(name: "CIPhotoEffectNoir")
currentFilter!.setValue(CIImage(image: greyImage.image!), forKey: kCIInputImageKey)
let output = currentFilter!.outputImage
let cgimg = context.createCGImage(output!,from: output!.extent)
let processedImage = UIImage(cgImage: cgimg!)
greyImage.image = processedImage
return greyImage.image!
}
func binarise() -> UIImage {
let glContext = EAGLContext(api: .openGLES2)!
let ciContext = CIContext(eaglContext: glContext, options: [kCIContextOutputColorSpace : NSNull()])
let filter = CIFilter(name: "CIPhotoEffectMono")
filter!.setValue(CIImage(image: self), forKey: "inputImage")
let outputImage = filter!.outputImage
let cgimg = ciContext.createCGImage(outputImage!, from: (outputImage?.extent)!)
return UIImage(cgImage: cgimg!)
}
func scaleImage() -> UIImage {
let maxDimension: CGFloat = 640
var scaledSize = CGSize(width: maxDimension, height: maxDimension)
var scaleFactor: CGFloat
if self.size.width > self.size.height {
scaleFactor = self.size.height / self.size.width
scaledSize.width = maxDimension
scaledSize.height = scaledSize.width * scaleFactor
} else {
scaleFactor = self.size.width / self.size.height
scaledSize.height = maxDimension
scaledSize.width = scaledSize.height * scaleFactor
}
UIGraphicsBeginImageContext(scaledSize)
self.draw(in: CGRect(x: 0, y: 0, width: scaledSize.width, height: scaledSize.height))
let scaledImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return scaledImage!
}
func orientate(img: UIImage) -> UIImage {
if (img.imageOrientation == UIImageOrientation.up) {
return img;
}
UIGraphicsBeginImageContextWithOptions(img.size, false, img.scale)
let rect = CGRect(x: 0, y: 0, width: img.size.width, height: img.size.height)
img.draw(in: rect)
let normalizedImage : UIImage = UIGraphicsGetImageFromCurrentImageContext()!
UIGraphicsEndImageContext()
return normalizedImage
}
}
然后在将图像传递到performImageRecognition
func processImage() {
self.imageView.image! = self.imageView.image!.toGrayScale()
self.imageView.image! = self.imageView.image!.binarise()
self.imageView.image! = self.imageView.image!.scaleImage()
}
希望这会有所帮助
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