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114 lines
3.2 KiB
C++
114 lines
3.2 KiB
C++
#include "TestLeptonica.h"
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static void RemoveLines(Pix &source, PixRaster &dest)
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{
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dest.Add(source);
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// threshold the image
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Pix thresholded = source.ThresholdToBinary(170);
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CHECKR(thresholded, "Error thresholding the image");
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dest.Add(thresholded);
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// find image skew of thresholded image
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double angle;
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CHECKR(thresholded.FindSkew(&angle, NULL), "Error finding skew value");
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// rotate original image using found threshold value
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double deg2rad = M_PI / 180.0;
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Pix rotated = source.RotateAMGray(deg2rad * angle, 255);
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CHECKR(rotated, "Error rotating image");
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dest.Add(rotated);
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// extract the lines to be removed
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Pix closed = rotated.CloseGray(51, 1);
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CHECKR(closed, "CloseGray error");
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dest.Add(closed);
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// solidify the lines to be removed
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Pix eroded = closed.ErodeGray(1, 5);
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CHECKR(eroded, "ErodeGray error");
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dest.Add(eroded);
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// clean the background of those lines
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Pix thresh2 = eroded.ThresholdToValue(210, 255);
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CHECKR(thresh2, "ThresholdToValue error");
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dest.Add(thresh2);
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Pix thresh3 = thresh2.ThresholdToValue(200, 0);
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CHECKR(thresh3, "ThresholdToValue error");
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dest.Add(thresh3);
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// get paint-through mask for changed pixels
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Pix thresh4 = thresh3.ThresholdToBinary(210);
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CHECKR(thresh4, "ThresholdToBinary error");
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dest.Add(thresh4);
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// invert the gray line image in order to whiten
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// the lines in the origina image
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Pix inverted = thresh3.Invert();
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CHECKR(inverted, "Invert error");
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dest.Add(inverted);
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// add inverted line image to original (deskewed) one
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// so all horizontal black lines will be erased
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// unrderlying parts of image are erase too
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Pix grayAdded = rotated.AddGray(inverted);
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CHECKR(grayAdded, "AddGray error");
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dest.Add(grayAdded);
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// "opens" the image with wite stripes, so the stripes
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// gets closed my surrounding pixels. As this changes
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// also the rest of image, we will use that one just for
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// filling the stripes. That's done by aid of mask created before...
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Pix opened2 = grayAdded.OpenGray(1, 9);
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CHECKR(opened2, "OpenGray error");
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dest.Add(opened2);
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// now to get the final result, we must combine the image with black stripes
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// removed with the one with grays opened to fill the stripes; we use the mask
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// created before to fill just the stripes and leave the rest of image unchanged
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Pix final = grayAdded.CombineMasked(opened2, thresh4);
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CHECKR(final, "CombineMasked error");
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dest.Add(final);
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}
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void TestLeptonica::onLineRemoval()
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{
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String fileName;
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FileSelector fs;
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Pix source;
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if(!PromptYesNo(
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"[= [* Line removal demo]&&"
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"Please select the 'dave-orig.png' image on TestLeptonica folder&"
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"or some equivalent GrayScale image with horizontal stripes on it&&"
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"[* CONTINUE ??]]"
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))
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return;
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fs.ReadOnlyOption();
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if(fs.ExecuteOpen("Please select image for line removal:"))
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{
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FileIn s;
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if(!s.Open(~fs))
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{
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PromptOK("Error opening image");
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s.Close();
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return;
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}
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// Loads pixraster from source raster
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CHECKR(source.Load(s), "Error loading image");
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s.Close();
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// apply line removal algothithm
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pixRaster.Clear();
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RemoveLines(source, pixRaster);
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// refresh the PixRasterCtrl control with the new image contents
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pixRasterCtrl.Reload();
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pixRasterCtrl.SetPage(0);
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}
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}
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