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|
/**
*
*/
package millie.plugins.core.hdr;
import java.awt.Color;
import java.awt.image.BufferedImage;
import millie.plugins.PluginInfo;
import millie.plugins.appimage.GenericAppImagePlugin;
import millie.plugins.parameters.CheckBoxParameter;
import millie.plugins.parameters.ImageParameter;
import millie.plugins.parameters.IntSliderParameter;
import millie.se.image.ImageProcessor;
import millie.se.operator.FastGaussianBlurOperator;
import millie.se.operator.GrayOperator;
import millie.se.operator.GrayOperator.SelectedColor;
import millie.se.operator.lut.LookupOperator;
import millie.se.operator.lut.PredefinedLUT;
import millie.util.ColorUtils;
/**
* @author millie
*
*/
@PluginInfo(name="HDR", category="Divers", description="HDR et tone mapping")
public class HDRPlugin extends GenericAppImagePlugin {
public HDRPlugin() {
//setRefreshable(true);
setLongProcessing(true);
addParameter(new ImageParameter("mean", "Image Normal"));
addParameter(new ImageParameter("high", "Image surexposée"));
addParameter(new IntSliderParameter("rayon", "Rayon", 1, 100, 10));
addParameter(new IntSliderParameter("marge", "Marge", 0, 50, 10));
addParameter(new IntSliderParameter("force", "Force", -150, 150,0));
addParameter(new IntSliderParameter("highlight", "Ton Clair", -100, 100,0));
addParameter(new IntSliderParameter("gamma", "Gamma", -100, 100,0));
//addParameter(new IntSliderParameter("shadow", "Ton Foncé", -100, 100,0));
addParameter(new CheckBoxParameter("pregamma", "Pregamma", false));
addParameter(new CheckBoxParameter("mask", "Voir le masque", false));
}
private double getGamma(int tGamma) {
double gamma = 0;
if(tGamma>=0) {
gamma = - tGamma / 100.0 + 1;
}
else {
gamma = -tGamma / 25.0 + 1;
}
return gamma;
}
/**
* Compute an array of HSB colors
* [position][h/s/b position]
* @param image
* @return
*/
float[][] computeHSB(BufferedImage image) {
ImageProcessor proc = new ImageProcessor(image);
float[][] out = new float[image.getWidth()*image.getHeight()][3];
int[] pixels = proc.getPixels();
int[] rgbT = new int[3];
for(int pos = 0;pos<pixels.length;pos++) {
int rgb = pixels[pos];
ColorUtils.getRGB(rgb, rgbT);
out[pos] = Color.RGBtoHSB(rgbT[0], rgbT[1], rgbT[2], null);
}
return out;
}
/**
* Calcul le facteur tel que :
* brightness1 ^ factor * 2^(-ev1) = brightness2 ^ factor * 2^(-ev2)
*
* => on prend une moyenne sur les valeurs ni cramées, ni sous exposées)
*/
double computeFactor(float[][] image1, float[][] image2, float ev1, float ev2, int marge) {
double factor = 0;
int count = 0;
marge+=10;
float margeInf = marge/255.0f;
float margeSup = 1-margeInf;
for(int pos = 0; pos<image1.length; pos++) {
float b1 = image1[pos][2];
float b2 = image2[pos][2];
//si l'une des couleurs est cramées ou sous exposés, on passe à la suite
if(b1>margeInf&&b1<margeSup&&b2>margeInf&&b2<margeSup&&Math.abs(b2-b1)>marge/255) {
count++;
factor+= 1.0/(Math.log(b1/b2));
}
}
if(factor!=0) {
factor = (-ev2+ev1) * Math.log(2) * factor;
factor/=count;
}
else {
factor = 0.45;
}
return factor;
}
float[][] computeHDR(BufferedImage low, BufferedImage mean, BufferedImage high, float evl, float evm, float evh, int marge) {
float[][] lowHSB = computeHSB(low);
float[][] meanHSB = computeHSB(mean);
float[][] highHSB = computeHSB(high);
int length = lowHSB.length;
//compute factor
double factorLM = computeFactor(lowHSB, meanHSB, evl, evm, marge);
double factorMH = computeFactor(meanHSB, highHSB, evm, evh, marge);
double factorLMInv = 1.0/factorLM;
double factorMHInv = 1.0/factorMH;
double min=Double.MAX_VALUE, max=0;
//linearisation of brightness
float[][] out = new float[length][3];
for(int pos = 0;pos<length;pos++) {
double b1 = lowHSB[pos][2];
double b2 = meanHSB[pos][2];
double b3 = highHSB[pos][2];
b1 = Math.pow(Math.pow(b1, factorLM) * Math.pow(2, -evl), factorLMInv);
b3 = Math.pow(Math.pow(b3, factorMH) * Math.pow(2, -evh), factorMHInv);
double bmax = Math.max(Math.max(b1, b2),b3);
out[pos][2] = (float) bmax;
if(b1==bmax) {
out[pos][0] = lowHSB[pos][0];
out[pos][1] = lowHSB[pos][1];
}
if(b2==bmax) {
out[pos][0] = meanHSB[pos][0];
out[pos][1] = meanHSB[pos][1];
}
if(b3==bmax) {
out[pos][0] = highHSB[pos][0];
out[pos][1] = highHSB[pos][1];
}
// save min/max value
if (bmax>max) max=bmax;
if (bmax<min) min=bmax;
}
// stretch brightness in range [0,1]
for(int pos = 0;pos<length;pos++)
out[pos][2] = (float) ((out[pos][2]-min)/(max-min));
return out;
}
@Override
public BufferedImage filter() throws Exception {
BufferedImage low = getInputImage();
double highlight = getGamma(getIntValue("highlight"));
//double shadow = getGamma(getIntValue("shadow"));
int marge = getIntValue("marge");
boolean seemask = getBooleanValue("mask");
boolean pregamma = getBooleanValue("pregamma");
BufferedImage mean = getImageValue("mean");
BufferedImage high = getImageValue("high");
if(high.getWidth()!=low.getWidth() || high.getHeight()!=low.getHeight())
throw new IllegalArgumentException("Images de tailles différentes");
if(mean.getWidth()!=low.getWidth() || mean.getHeight()!=low.getHeight())
throw new IllegalArgumentException("Images de tailles différentes");
float[][] hdr = computeHDR(low, mean, high, -1, 0, 1, marge);
//recompute brightness
BufferedImage out = new BufferedImage(mean.getWidth(), mean.getHeight(), mean.getType());
ImageProcessor proc = new ImageProcessor(out);
int[] pixels = proc.getPixels();
float[] mask = getMask(low, getIntValue("rayon"), getIntValue("force"), highlight);
double gamma = getGamma(getIntValue("gamma"));
double inv = 1.0/gamma;
for(int pos = 0;pos<hdr.length;pos++) {
double b = hdr[pos][2];
double pmask = mask[pos];
if(!seemask) {
if(pregamma)
b = Math.pow(b, inv);
b = softLight(b, pmask);
if(!pregamma)
b = Math.pow(b, inv);
}
else
b = pmask;
if(b<0) b=0;
if(b>1) b=1;
pixels[pos] = Color.HSBtoRGB(hdr[pos][0], hdr[pos][1], (float) b);
}
proc.commit();
return out;
}
private float[] getMask(BufferedImage low, int rayon, int force, double highlight) {
BufferedImage mask = new GrayOperator(SelectedColor.ALL).compute(low);
//Blur mask
BufferedImage blur = new FastGaussianBlurOperator(rayon).compute(mask);
short[] contrastLut = PredefinedLUT.getContrastLUT(force);
short[] highlightLut = PredefinedLUT.getGammaLUT(highlight);
short[] enhancementLut = new short[256]; //build the new LUT
for(int color = 0; color<enhancementLut.length;color++)
enhancementLut[color] = contrastLut[highlightLut[255-color]]; //inversion + sigmoide
LookupOperator op = new LookupOperator(enhancementLut);
blur = op.compute(blur);
ImageProcessor proc = new ImageProcessor(blur);
int[] pixels = proc.getPixels();
float[] ret = new float[blur.getWidth()*blur.getHeight()];
for(int pos=0;pos<ret.length;pos++)
ret[pos] = (pixels[pos]&0xFF)/255.0f;
return ret;
}
/**
* compute a softLight fusion for 2 brightness entre 0 et 1
*
* @param f1
* @param f2
* @return
*/
static public double softLight(double f1, double f2) {
double out = 0;
if(f2<0.5)
out= f1-(1-2*f2)*f1*(1-f1);
else
out = f1+(-1+2*f2)*(softLightD(f1)-f1);
return out;
}
static private double softLightD(double x) {
if(x<0.25) return ((16*x-12)*x+4)*x;
else return Math.sqrt(x);
}
} |
Envoyé par Valentin33
Merci pseudo code, je regarde ca demain
Répondre avec citation
Plus "riche" que sans corrections : c'est sûr et certains !!!
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