public static Pix OtsuAdaptiveThreshold(Pix pix, int sx, int sy, int smoothx, int smoothy, float fraction)
{
if (pix.Depth != 8)
{
if (pix.Depth == 1)
{
pix = Convert.Convert1To8(pix);
}
else
{
pix = Convert.ConvertTo8(pix);
}
}
(sx >= 16).VerifyCondition("sx must be at least 16 or greater.");
(sy >= 16).VerifyCondition("sy must be at least 16 or greater.");
IntPtr ppxith, ppixd;
int result = LeptonicaNativeApi.Native.pixOtsuAdaptiveThreshold(pix.Reference, sx, sy, smoothx, smoothy, fraction, out ppxith, out ppixd);
if (ppxith != IntPtr.Zero)
{
LeptonicaNativeApi.Native.pixDestroy(ref ppxith);
}
if (result == 1)
{
throw new NullReferenceException("failed to binarize.");
}
return(Pix.Create(ppixd));
}
public static Pix SauvolaTiled(Pix pix, int wsize, float factor, int nx, int ny)
{
if (pix.Depth != 8)
{
if (pix.Depth == 1)
{
pix = Convert.Convert1To8(pix);
}
else
{
pix = Convert.ConvertTo8(pix);
}
}
(wsize >= 2).VerifyCondition("wsize must be greater then 2");
int max = Math.Min((pix.Width - 3) / 2, (pix.Height - 3) / 2);
(wsize < max).VerifyCondition("wsize must be lower than value {0}", max);
(factor >= 0).VerifyCondition("factor must be greater than 0");
IntPtr a, b;
int result = LeptonicaNativeApi.Native.pixSauvolaBinarizeTiled(pix.Reference, wsize, factor, nx, ny, out a, out b);
if (a != IntPtr.Zero)
{
LeptonicaNativeApi.Native.pixDestroy(ref a);
}
if (result == 1)
{
throw new NullReferenceException("failed to binarize.");
}
return(Pix.Create(b));
}
public static Pix pixConvert1To8(this Pix pixd, Pix pixs, byte val0, byte val1)
{
if (null == pixs)
{
throw new ArgumentNullException("pixs cannot be null.");
}
if (pixs.Depth != 1)
{
throw new ArgumentException("pixs not 1 bpp.");
}
if (null != pixd)
{
if (pixs.Width != pixd.Width || pixs.Height != pixd.Height)
{
throw new ArgumentException("pix sizes unequal.");
}
if (pixd.Depth != 8)
{
throw new ArgumentException("pixd not 8 bpp.");
}
}
else
{
pixd = Pix.Create(pixs.Width, pixs.Height, 8);
}
Native.DllImports.pixCopyResolution((HandleRef)pixd, (HandleRef)pixs);
var pointer = Native.DllImports.pixConvert1To8((HandleRef)pixd, (HandleRef)pixs, val0, val1);
return(new Pix(pointer));
}
public static Pix Pivot(Pix pix, float angle, RotationMethod method = RotationMethod.AreaMap, RotationFill fillColor = RotationFill.White, int?w = null, int?h = null)
{
w = w.IsNullOrEmpty() ? pix.Width : w;
h = h.IsNullOrEmpty() ? pix.Height : h;
if (Math.Abs(angle) < TinyAngle)
{
return(pix.Clone());
}
IntPtr p;
double rotations = 2 * angle / Math.PI;
if (Math.Abs(rotations - Math.Floor(rotations)) < TinyAngle)
{
p = LeptonicaNativeApi.Native.pixRotateOrth(pix.Reference, (int)rotations);
}
else
{
p = LeptonicaNativeApi.Native.pixRotate(pix.Reference, angle, method, fillColor, w.Value, h.Value);
}
if (p == IntPtr.Zero)
{
throw new NullReferenceException("failed to rotate");
}
return(Pix.Create(p));
}
public static Pix ClipToRectangle(Pix pix, Box box)
{
IntPtr ptr = LeptonicaNativeApi.Native.pixClipRectangle(pix.Reference, box.Reference, IntPtr.Zero);
if (ptr == IntPtr.Zero)
{
throw new NullReferenceException("failed to crop");
}
return(Pix.Create(ptr));
}
public static Pix UnsharpMasking(Pix pix)
{
IntPtr p = LeptonicaNativeApi.Native.pixUnsharpMasking(pix.Reference, DefaultHalfWidth, DefaultFraction);
if (p == IntPtr.Zero)
{
throw new NullReferenceException("failed to unsharpMasking");
}
return(Pix.Create(p));
}
public static Pix Translate(Pix pix, int horizontalShift, int verticalShift, ColorOptions options)
{
IntPtr ptr = LeptonicaNativeApi.Native.pixTranslate(IntPtr.Zero, pix.Reference, horizontalShift, verticalShift, options);
if (ptr == IntPtr.Zero)
{
throw new NullReferenceException("failed to translate");
}
return(Pix.Create(ptr));
}
public static Pix Flake(Pix pix, float x, float y)
{
IntPtr p = LeptonicaNativeApi.Native.pixScale(pix.Reference, x, y);
if (p == IntPtr.Zero)
{
throw new NullReferenceException("failed to scale.");
}
return(Pix.Create(p));
}
public static Pix Convert1To8(Pix pix, int whiteColor, int blackColor)
{
IntPtr ptr = LeptonicaNativeApi.Native.pixConvert1To8(IntPtr.Zero, pix.Reference, whiteColor, blackColor);
if (ptr == IntPtr.Zero)
{
throw new NullReferenceException("failed to Convert1To8");
}
return(Pix.Create(ptr));
}
public static Pix ConvertTo1(Pix pix, int threshold)
{
IntPtr ptr = LeptonicaNativeApi.Native.pixConvertTo1(pix.Reference, threshold);
if (ptr == IntPtr.Zero)
{
throw new NullReferenceException("failed to ConvertTo1");
}
return(Pix.Create(ptr));
}
public static Pix ConvertRGBToLuminance(Pix pix)
{
IntPtr ptr = LeptonicaNativeApi.Native.pixConvertRGBToLuminance(pix.Reference);
if (ptr == IntPtr.Zero)
{
throw new NullReferenceException("failed to ConvertRGBToLuminance");
}
return(Pix.Create(ptr));
}
public static Pix CleanBackgroundToWhite(Pix pix, float gamma, int blackColor, int whiteColor)
{
IntPtr ptr = LeptonicaNativeApi.Native.pixCleanBackgroundToWhite(pix.Reference, IntPtr.Zero, IntPtr.Zero, gamma, blackColor, whiteColor);
if (ptr == IntPtr.Zero)
{
throw new NullReferenceException("failed to CleanBackgroundToWhite");
}
return(Pix.Create(ptr));
}
public static Pix Blockconvolve(Pix pix, int sx, int sy)
{
IntPtr ptr = LeptonicaNativeApi.Native.pixBlockconv(pix.Reference, sx, sy);
if (ptr == IntPtr.Zero)
{
throw new NullReferenceException("failed to Blockconvolve");
}
return(Pix.Create(ptr));
}
public static Pix PixTophat(this Pix pix, int w = 17, int h = 17, L_TOPHAT options = L_TOPHAT.BLACK)
{
if (pix == null)
{
throw new ArgumentNullException("pix is null");
}
IntPtr pixPtr = LeptonicaNativeApi.Native.pixTophat(pix.Reference, h, w, options);
return(Pix.Create(pixPtr));
}
public static Pix CloseGray(Pix pix, int sx, int sy)
{
IntPtr ptr = LeptonicaNativeApi.Native.pixCloseGray(pix.Reference, sx, sy);
if (ptr == IntPtr.Zero)
{
throw new NullReferenceException("failed to CloseGray");
}
return(Pix.Create(ptr));
}
/*pix extensions*/
public static Pix PixBackgroundNormSimple(this Pix pix)
{
if (pix == null)
{
throw new ArgumentNullException("pix is null");
}
IntPtr pixPtr = LeptonicaNativeApi.Native.pixBackgroundNormSimple(pix.Reference, IntPtr.Zero, IntPtr.Zero);
return(Pix.Create(pixPtr));
}
public static Pix PixConvertRGBToGray(this Pix pix, float r = 0.5f, float g = 0.3f, float b = 0.2f)
{
if (pix == null)
{
throw new ArgumentNullException("pix is null");
}
IntPtr pixPtr = LeptonicaNativeApi.Native.pixConvertRGBToGray(pix.Reference, r, g, b);
return(Pix.Create(pixPtr));
}
public static Pix PixThresholdToBinary(this Pix pix, int whiteColor = 35)
{
if (pix == null)
{
throw new ArgumentNullException("pix is null");
}
IntPtr pixPtr = LeptonicaNativeApi.Native.pixThresholdToBinary(pix.Reference, whiteColor);
return(Pix.Create(pixPtr));
}
public static Pix ConvertTo8(Pix pix, int flag)
{
IntPtr p = LeptonicaNativeApi.Native.pixConvertTo8(pix.Reference, flag);
if (p == IntPtr.Zero)
{
throw new NullReferenceException("failed to convert 8pp");
}
return(Pix.Create(p));
}
public static Pix PixFindSkewAndDeskew(this Pix pix, int windowSize = 2)
{
if (pix == null)
{
throw new ArgumentNullException("pix is null");
}
float angle, confidence;
IntPtr pixPtr = LeptonicaNativeApi.Native.pixFindSkewAndDeskew(pix.Reference, windowSize, out angle, out confidence);
return(Pix.Create(pixPtr).PixRotate(angle, confidence));
}
public static Pix DewrapSinglePage(Pix pix, DewrapThresh thresh, DewrapThresholding adaptive, DewrapOrientation orinetation, DewrapOptions options)
{
IntPtr ptr;
int result = LeptonicaNativeApi.Native.dewarpSinglePage(pix.Reference, thresh, adaptive, orinetation, out ptr, IntPtr.Zero, options);
if (result == 1)
{
throw new NullReferenceException("failed to dewrap");
}
return(Pix.Create(ptr));
}
public static Pix FindSkewAndDeskew(Pix pix, int redSearch)
{
float pangle, pconf;
IntPtr ptr = LeptonicaNativeApi.Native.pixFindSkewAndDeskew(pix.Reference, redSearch, out pangle, out pconf);
if (ptr == IntPtr.Zero)
{
throw new NullReferenceException("failed to findSkewAndDeskew");
}
return(Pix.Create(ptr));
}
public static Pix UnsharpMasking(Pix pix, int halfwidth, float fract)
{
(fract > 0.2f).VerifyCondition("fraction must be greater than 0.2");
(fract < 0.7f).VerifyCondition("fraction must be lower than 0.7");
IntPtr p = LeptonicaNativeApi.Native.pixUnsharpMasking(pix.Reference, halfwidth, fract);
if (p == IntPtr.Zero)
{
throw new NullReferenceException("failed to unsharpMasking");
}
return(Pix.Create(p));
}
public static Pix PixRotate(this Pix pix, float angle, float confidence, RotationMethod method = RotationMethod.Shear, RotationFill fill = RotationFill.White)
{
if (pix == null)
{
throw new ArgumentNullException("pix is null");
}
if (IsRotationConfident(confidence))
{
IntPtr pixPtr = LeptonicaNativeApi.Native.pixRotate(pix.Reference, angle.DegreeToRadians(), method, fill, pix.Width, pix.Height);
return(Pix.Create(pixPtr));
}
return(pix);
}
public static Pix SobelEdgeFilter(Pix pix, EdgeDirection orientflag = EdgeDirection.All)
{
if (pix.Depth != 8)
{
pix = Convert.ConvertTo8(pix);
}
IntPtr p = LeptonicaNativeApi.Native.pixSobelEdgeFilter(pix.Reference, orientflag);
if (p == IntPtr.Zero)
{
throw new NullReferenceException("failed to edge.");
}
return(Pix.Create(p));
}
public static Pix ConvertRGBToGray(Pix pix, float rwt, float gwt, float bwt)
{
(pix.Depth == 32).VerifyCondition("image must be 32pp.");
(rwt >= 0).VerifyCondition("red weight must be greater than 0");
(gwt >= 0).VerifyCondition("green weight must be greater than 0");
(bwt >= 0).VerifyCondition("blue weight must be greater than 0");
IntPtr p = LeptonicaNativeApi.Native.pixConvertRGBToGray(pix.Reference, rwt, gwt, bwt);
if (p == IntPtr.Zero)
{
throw new NullReferenceException("failed to convert gray scale.");
}
return(Pix.Create(p));
}
public static Pix Deskew(Pix pix, Sweep sweep, int redSearch, int threshold, out Scew scew)
{
float angle, confidence;
IntPtr p = LeptonicaNativeApi.Native.pixDeskewGeneral(pix.Reference, sweep.Reduction, sweep.Range, sweep.Delta, redSearch, threshold, out angle, out confidence);
if (p == IntPtr.Zero)
{
throw new NullReferenceException("failed to deskew.");
}
scew = new Scew()
{
Angle = angle,
Confidence = confidence
};
return(Pix.Create(p));
}
/*
* public static Pix ContrastNorm(Pix pix) {
* return ContrastNorm(pix, DefaultTileWidth, DefaultTileHeight, DefaultDifference, DefaultSmoothX, DefaultSmoothY);
* }
*
* public static Pix ContrastNorm(Pix pix, int sx, int sy, int diff, int smoothx, int smoothy) {
* if(pix.Depth != 8) {
* if(pix.Depth == 1) {
* pix = Convert.Convert1To8(pix);
* } else {
* pix = Convert.ConvertTo8(pix);
* }
* }
* IntPtr p = LeptonicaNativeApi.Native.pixContrastNorm(IntPtr.Zero, pix.Reference, sx, sy, diff, smoothx, smoothy);
* if(p == IntPtr.Zero) {
* throw new NullReferenceException("failed to contrastNorm");
* }
* return Pix.Create(p);
* }*/
public static Pix NormalizeIllumination(Pix pix, int reduction, int size, int backgroundColor, int sx, int sy)
{
IntPtr pixr, pixg, pixb;
LeptonicaNativeApi.Native.pixBackgroundNormRGBArraysMorph(pix.Reference, IntPtr.Zero, reduction, size, backgroundColor, out pixr, out pixg, out pixb);
if (pixr != IntPtr.Zero && pixg != IntPtr.Zero && pixb != IntPtr.Zero)
{
IntPtr ptr = LeptonicaNativeApi.Native.pixApplyInvBackgroundRGBMap(pix.Reference, pixr, pixg, pixb, sx, sy);
if (ptr == IntPtr.Zero)
{
throw new NullReferenceException("failed to normalize illumunation");
}
LeptonicaNativeApi.Native.pixDestroy(ref pixr);
LeptonicaNativeApi.Native.pixDestroy(ref pixg);
LeptonicaNativeApi.Native.pixDestroy(ref pixb);
return(Pix.Create(ptr));
}
throw new NullReferenceException("failed to normalize illumunation");
}
public static Pix BackgroundNormMorph(Pix pix, int reduction, int size, int backgroundColor)
{
if (pix.Depth != 8)
{
if (pix.Depth == 1)
{
pix = Convert.Convert1To8(pix);
}
else
{
pix = Convert.ConvertTo8(pix);
}
}
IntPtr p = LeptonicaNativeApi.Native.pixBackgroundNormMorph(pix.Reference, IntPtr.Zero, reduction, size, backgroundColor);
if (p == IntPtr.Zero)
{
throw new NullReferenceException("failed to backgroundNormMorph");
}
return(Pix.Create(p));
}
// Unpacking conversion from 1 bpp to 2, 4, 8, 16 and 32 bpp
public static Pix pixUnpackBinary(this Pix pixs, int depth, int invert)
{
if (null == pixs)
{
throw new ArgumentNullException("pixs cannot be null.");
}
if (pixs.Depth != 1)
{
throw new ArgumentException("pixs not 1 bpp.");
}
if (depth != 2 && depth != 4 && depth != 8 && depth != 16 && depth != 32)
{
throw new ArgumentException("depth not 2, 4, 8, 16, or 32 bpp.");
}
Pix pixd = Pix.Create(pixs.Width, pixs.Height, depth);
if (pixs.Depth == 2)
{
if (invert == 0)
{
pixConvert1To2(pixd, pixs, 0, 3);
}
else
{
pixConvert1To2(pixd, pixs, 3, 0);
}
}
else if (depth == 4)
{
if (invert == 0)
{
pixConvert1To4(pixd, pixs, 0, 15);
}
else /* invert bits */
{
pixConvert1To4(pixd, pixs, 15, 0);
}
}
else if (depth == 8)
{
if (invert == 0)
{
pixConvert1To8(pixd, pixs, 0, 255);
}
else /* invert bits */
{
pixConvert1To8(pixd, pixs, 255, 0);
}
}
else if (depth == 16)
{
if (invert == 0)
{
pixConvert1To16(pixd, pixs, 0, 0xffff);
}
else /* invert bits */
{
pixConvert1To16(pixd, pixs, 0xffff, 0);
}
}
else
{
if (invert == 0)
{
pixConvert1To32(pixd, pixs, 0, 0xffffffff);
}
else
{
pixConvert1To32(pixd, pixs, 0xffffffff, 0);
}
}
return(pixd);
}