我目前正在使用OCR计划。我使用tesseract,我需要去抖动图像,以提高检测到的字符的质量。问题是tesseract给出的偏斜校正特性并没有产生足够的吸引力。所以我试图用AForge和Atalasoft来修改图像,但每次,无论如何,图像都不是他们需要的格式。我究竟做错了什么?或者有更好的解决方案?
这是AForge的实施
System.Drawing.Bitmap imageToBitmap = AForge.Imaging.Image.FromFile(imagePath);
Console.WriteLine("before " + imageToBitmap.PixelFormat);
System.Drawing.Bitmap NewPicture = imageToBitmap.Clone(new System.Drawing.Rectangle(0, 0, imageToBitmap.Width, imageToBitmap.Height), System.Drawing.Imaging.PixelFormat.Format24bppRgb);
var dop = AForge.Imaging.Image.Clone(imageToBitmap, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
Console.WriteLine("after " + dop.PixelFormat);
AForge.Imaging.DocumentSkewChecker skewChecker = new AForge.Imaging.DocumentSkewChecker();
// get documents skew angle
double angle = skewChecker.GetSkewAngle(dop);
// create rotation filter
AForge.Imaging.Filters.RotateBilinear rotationFilter = new AForge.Imaging.Filters.RotateBilinear(-angle);
rotationFilter.FillColor = System.Drawing.Color.White;
// rotate image applying the filter
System.Drawing.Bitmap rotatedImage = rotationFilter.Apply(imageToBitmap);
rotatedImage.Save("deskewedImage");
这是Atalasoft的实现
AtalaImage img = new AtalaImage(imagePath);
AutoDeskewCommand cmd = new AutoDeskewCommand();
AtalaImage resultImage = cmd.Apply(img).Image;
resultImage.Save("result.tif", new TiffEncoder(), null);
答案 0 :(得分:1)
我终于理解了为什么它不起作用:图像应该转换为Format8bppIndexed或方法skewChecker.GetSkewAngle(image)将抛出异常
Bitmap tempImage = AForge.Imaging.Image.FromFile(imagePath);
Bitmap image;
if (tempImage.PixelFormat.ToString().Equals("Format8bppIndexed"))
{
image = tempImage;
}
else
{
image = AForge.Imaging.Filters.Grayscale.CommonAlgorithms.BT709.Apply(tempImage);
}
tempImage.Dispose();
AForge.Imaging.DocumentSkewChecker skewChecker = new AForge.Imaging.DocumentSkewChecker();
// get documents skew angle
double angle = skewChecker.GetSkewAngle(image);
// create rotation filter
AForge.Imaging.Filters.RotateBilinear rotationFilter = new AForge.Imaging.Filters.RotateBilinear(-angle);
rotationFilter.FillColor = Color.Black;
// rotate image applying the filter
Bitmap rotatedImage = rotationFilter.Apply(image);
var deskewedImagePath = folderSavePath + filename + "_deskewed.tiff";
rotatedImage.Save(deskewedImagePath, System.Drawing.Imaging.ImageFormat.Tiff);
image.Dispose();
rotatedImage.Dispose();