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JWPHRIJK  
#1 Posted : Friday, June 8, 2018 5:16:57 PM(UTC)
JWPHRIJK

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Netherlands

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Hello,

I'm working om a application to OCRen check the orientation from a multipage Tiff file en then create a PDF. For checking the orientation I need to call OcrApi.recognise() and for the OCR I need to call OcrApi.ProcessPage() to render the found text into a pdf. This seems redundant while both methodes seem to proces the tekst from the image.

Is there a way to combine the orientation check and the ProcessPage proces to speed up the proces.

Thanks in advance for the reply.
Paul Rayman  
#2 Posted : Sunday, June 10, 2018 7:48:26 AM(UTC)
Paul Rayman

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Hi,

Try the following

Code:

    using (var api = OcrApi.Create())
    {
        api.Init(Languages.English);
        using (var renderer = OcrPdfRenderer.Create(@"d:\0\multipage", @"tessdata"))
        {
            renderer.BeginDocument("Title");
            var image = Image.FromFile(@"d:\0\multipage.tif");
            int pageCnt = image.GetFrameCount(FrameDimension.Page);

            for (int index = 0; index < pageCnt; index++)
            {
                image.SelectActiveFrame(FrameDimension.Page, index);
                using (var bmp = new Bitmap(image.Width, image.Height))
                {
                    using (var g = Graphics.FromImage(bmp))
                    {
                        g.DrawImage(image, 0, 0, image.Width, image.Height);
                    }
                    using (var pix = OcrPix.FromBitmap(bmp))
                    {
                        api.InputName = @"multipage.tif";
                        api.InputImage = pix;
                        api.SetImage(pix);
                        api.SourceResolution = 95;
                        api.Recognize();

                        var b = renderer.AddImage(api);
                    }
                }
            }
            renderer.EndDocument();
        }
    }
}
JWPHRIJK  
#3 Posted : Monday, June 11, 2018 2:58:12 PM(UTC)
JWPHRIJK

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Thanks for the reply,

This gets me further but I still have to edit the picture. Is it possible to deskey and set the orientation of the OcrPix format Or do I first have to convert it to a bitmap.
Paul Rayman  
#4 Posted : Thursday, June 14, 2018 2:38:59 AM(UTC)
Paul Rayman

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You can convert it to an Image since after that you will have to make a new recognition in any case.
JWPHRIJK  
#5 Posted : Tuesday, June 19, 2018 4:08:45 PM(UTC)
JWPHRIJK

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Thanks for your response,

This is just what I wanted to prevent! isn't there a way to change the rotation and orientation of the image in the api object before calling renderer.EndDocument() and not having to call Recognize() again
Paul Rayman  
#6 Posted : Thursday, June 21, 2018 4:09:17 AM(UTC)
Paul Rayman

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In this case you should not to rotate the image even if it turned
You may try to use AUTO_ROTATE or remember the angle of rotation and rotate the page in the finished PDF.
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