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Hi friends, I´m working in a project where I need cropping images, usually BIG TIFF images. I´m newbie with this libraries, so I´m reading and reading the documentation, but I can´t find any function to do a auto-deskew (based on edges, or based on text) before apply the crop. Is there any way to do this...?? Thanks in advance 
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Rank: Advanced Member
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Joined: 7/28/2003(UTC)
Posts: 1,660
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Hi, Graphics Mill doesn't implement the deskew algorithm. The general approach of the algorithm (Hough transform) is described here : https://stackoverflow.co...05/deskew-scanned-imagesI have added your request to our backlog, but we don't have any specific plans to implement it. If this feature is critical for you please let me know. |
Best regards,
Fedor Skvortsov
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 1 user thanked Fedor for this useful post.
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Rank: Advanced Member
Groups: Guest
Joined: 3/8/2018(UTC)
Posts: 45
Thanks: 21 times
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Morning Fedor, thanks again. In my project, I´m trying understand the Pipeline performance and may be I´m doing something wrong. In this moment I´m trying process a Tiff image. I must crop the input tiff, apply border if selected and write in the output path. In the next code I´m using Pipeline, if I use the generator I receive an error: (Either a PipelineElement instance, which cannot act as a receiver, has been passed to a PipelineElement.Receivers collection or a PipelineElement instance, which cannot act as a source, has entries in its PipelineElement.Receivers collection. Nombre del parámetro: element')And if I don´t use the generator my output image has only 1Kb and it´s a invalid image. The problem is that I don´t know how to indicate to the blender that the blender.TopImage is the result of the crop operation. I guess this is the cause of my output bad image. I really don´t know why I don´t need include the reader into my Pipeline sequence (If I do, Pipeline results an exception error saying that TiffReader is included more than one time). Please, could you help me..?? Thanks in advance. Code:using (var reader = TiffReader.Create(ficheroIN))
using (var crop = new Crop(rectangulo))
using (var writer = new TiffWriter(ficheroOUT))
{
if (procesar_exif)
{
var exif = reader.Exif;
writer.Exif = exif;
}
if (border_size != 0)
{
using (var borderColor = new RgbColor(0, 0, 0))
using (var generator = new ImageGenerator(crop.Rectangle.Width + border_size * 2, crop.Rectangle.Height + border_size * 2, reader.PixelFormat, borderColor))
using (var blender = new Blender())
{
//blender.TopImage = reader; How do I use as TopImage the crop result ???
blender.X = border_size;
blender.Y = border_size;
Pipeline.Run(crop + generator + blender + writer);
}
}
else
{
Pipeline.Run(reader + crop + writer);
}
}
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Rank: Advanced Member
Groups: Guest
Joined: 3/8/2018(UTC)
Posts: 45
Thanks: 21 times
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I did it on this way, but I don´t know if it´s possible optimize the method including the crop in the Pipeline. Thanks again. Code:using (var reader = TiffReader.Create(ficheroIN))
using (var crop = new Crop(rectangulo))
using (var writer = new TiffWriter(ficheroOUT))
{
var bitmap = new Aurigma.GraphicsMill.Bitmap(rectangulo.Width, rectangulo.Height, reader.PixelFormat);
if (procesar_exif)
{
var exif = reader.Exif;
writer.Exif = exif;
}
if (border_size != 0)
{
using (var borderColor = RgbColor.Black)
using (var generator = new ImageGenerator(crop.Rectangle.Width + border_size * 2, crop.Rectangle.Height + border_size * 2, reader.PixelFormat, borderColor))
using (var blender = new Blender())
{
bitmap = reader.Frames[0].GetBitmap();
bitmap.Transforms.Crop(rectangulo);
blender.TopImage = bitmap;
blender.X = border_size;
blender.Y = border_size;
generator.DpiX = reader.DpiX;
generator.DpiY = reader.DpiY;
Pipeline.Run(generator + blender + writer);
bitmap.Dispose();
}
}
else
{
Pipeline.Run(reader + crop + writer);
}
}
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Rank: Advanced Member
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Joined: 9/19/2006(UTC)
Posts: 505
Was thanked: 41 time(s) in 41 post(s)
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Hi, This line should do the trick. Code:blender.TopImage = reader.Frames[0] + crop;
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Best regards,
Eugene Kosmin
The Aurigma Development Team
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Rank: Advanced Member
Groups: Guest
Joined: 3/8/2018(UTC)
Posts: 45
Thanks: 21 times
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Thanks Eugene, I´ll try it and let you know. Regards.
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Rank: Advanced Member
Groups: Guest
Joined: 3/8/2018(UTC)
Posts: 45
Thanks: 21 times
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Originally Posted by: Eugene Kosmin  Hi, This line should do the trick. Code:blender.TopImage = reader.Frames[0] + crop;
It works...!!!! Thanks a lot...!!! Regards.
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