int Image32::Quantize(const int& bits,Image32& outputImage) const
{
int height = this->height();
int width = this->width();
outputImage.setSize(width, height);
for(int y=0; y<height; ++y){
for(int x=0; x<width; ++x){
int r = this->pixel(x,y).r;
int g = this->pixel(x,y).g;
int b = this->pixel(x,y).b;
int multiple = int(pow(2,8-bits));
int quanR = r + multiple/2;
quanR = min(255, quanR - (quanR % multiple)); // clamped to 255
int quanG = g + multiple/2;
quanG = min(255, quanG - (quanG % multiple)); // clamped to 255
int quanB = b + multiple/2;
quanB = min(255, quanB - (quanB % multiple)); // clamped to 255
outputImage.pixel(x,y).r = quanR;
outputImage.pixel(x,y).g = quanG;
outputImage.pixel(x,y).b = quanB;
outputImage.pixel(x,y).a = this->pixel(x,y).a;
}
}
return 1;
}
int Image32::Warp(const OrientedLineSegmentPairs& olsp,Image32& outputImage) const
{
int height = this->height();
int width = this->width();
outputImage.setSize(width,height);
int numOfLineSegments = olsp.count;
float dSumX, dSumY, weight, weightSum;
cout << "warp" << "\n";
for(int y=0; y<height; ++y){
for(int x=0; x<width; ++x){
for(int i=0; i<numOfLineSegments; ++i){
dSumX = 0, dSumY = 0, weightSum = 0;
weight = olsp.segments2[i].getWeight(x,y);
weightSum += weight;
float sourceX, sourceY;
olsp.segments1[i].GetSourcePosition(olsp.segments1[i], olsp.segments2[i], x, y, sourceX, sourceY);
dSumX += (sourceX - x) * weight;
dSumY += (sourceY - y) * weight;
}
outputImage.pixel(x,y).r = this->pixel(x + (dSumX/weightSum), y + (dSumY/weightSum)).r;
outputImage.pixel(x,y).g = this->pixel(x + (dSumX/weightSum), y + (dSumY/weightSum)).g;
outputImage.pixel(x,y).b = this->pixel(x + (dSumX/weightSum), y + (dSumY/weightSum)).b;
}
}
return 1;
}
int Image32::Brighten(const float& brightness,Image32& outputImage) const
{
int height = this->height();
int width = this->width();
outputImage.setSize(width, height);
for(int y=0; y<height; ++y){
for(int x=0; x<width; ++x){
int r = this->pixel(x,y).r;
int g = this->pixel(x,y).g;
int b = this->pixel(x,y).b;
int rBright = int(r * brightness);
int gBright = int(g * brightness);
int bBright = int(b * brightness);
if(rBright <= 255 && gBright <= 255 && bBright <= 255 ){
outputImage.pixel(x,y).r = rBright;
outputImage.pixel(x,y).g = gBright;
outputImage.pixel(x,y).b = bBright;
outputImage.pixel(x,y).a = this->pixel(x,y).a;
}
else{
// must clamp if any r,g,b values are over 255
int maxBrightness = 255 / max(r,max(g,b));
outputImage.pixel(x,y).r = int(r * maxBrightness);
outputImage.pixel(x,y).g = int(g * maxBrightness);
outputImage.pixel(x,y).b = int(b * maxBrightness);
outputImage.pixel(x,y).a = this->pixel(x,y).a;
}
}
}
return 1;
}
int Image32::FunFilter(Image32& outputImage) const
{
double height = this->height();
double width = this->width();
for(int y=0; y<height; ++y){
for(int x=0; x<width; ++x){
double y1 = (double) y / (double) (height-1.0);
double x1 = (double) x / (double) (width-1.0);
double r = sqrt( pow(x1 - 0.5, 2.0) + pow(y1 - 0.5, 2.0) );
double a = atan2((y1 - 0.5) , (x1 - 0.5));
double rd = pow(r, 2.5)/.5;
float xNew = ((rd*cos(a)) + 0.5) * (width-1);
float yNew = ((rd*sin(a)) + 0.5) * (height-1);
Pixel32 pix = this->NearestSample(xNew,yNew);
outputImage.pixel(x,y).r = pix.r;
outputImage.pixel(x,y).g = pix.g;
outputImage.pixel(x,y).b = pix.b;
}
}
return 1;
}
/*
* scales each pixel's rgb by the brightness factor to increase brightness
*/
int Image32::Brighten(const float& brightness,Image32& outputImage) const
{
int r1, g1, b1;
for (int x = 0; x < outputImage.width(); x++)
for (int y = 0; y < outputImage.height(); y++)
{
// clamp [0,255]
r1 = (int)(pixel(x,y).r*brightness);
if (r1 > 255)
r1 = 255;
if (r1 < 0)
r1 = 0;
g1 = (int)(pixel(x,y).g*brightness);
if (g1 > 255)
g1 = 255;
if (g1 < 0)
g1 = 0;
b1 = (int)(pixel(x,y).b*brightness);
if (b1 > 255)
b1 = 255;
if (b1 < 0)
b1 = 0;
// write clamped values to outputImage
outputImage.pixel(x,y).r = r1;
outputImage.pixel(x,y).g = g1;
outputImage.pixel(x,y).b = b1;
}
return 1;
}
int Image32::RotateGaussian(const float& angle,Image32& outputImage) const
{
int height = this->height();
int width = this->width();
double rad = -1.0 * angle * (M_PI/180.0);
double midHeight = (height/2.0);
double midWidth = (width/2.0);
double diagonal = sqrt(midHeight*midHeight + midWidth*midWidth);
int offset = ceil(diagonal - min(midWidth, midHeight));
Image32 interImage;
interImage.setSize(width+(2*offset), height+(2*offset));
outputImage.setSize(width+(2*offset), height+(2*offset));
float variance = 2;
float radius = 2;
for(int y=0; y < height; ++y){
for(int x=0; x < width; ++x){
int xOffset = x + offset;
int yOffset = y + offset;
interImage.pixel(xOffset, yOffset).r = this->pixel(x,y).r;
interImage.pixel(xOffset, yOffset).g = this->pixel(x,y).g;
interImage.pixel(xOffset, yOffset).b = this->pixel(x,y).b;
}
}
for(int y=-1*offset; y < height + offset; ++y){
for(int x=-1*offset; x < width + offset; ++x){
int xOffset = x + offset;
int yOffset = y + offset;
float u = cos(rad)*(x - midWidth) - sin(rad)*(y - midHeight) + offset + midWidth;
float v = sin(rad)*(x - midWidth) + cos(rad)*(y - midHeight) + offset + midHeight;
Pixel32 pix = interImage.GaussianSample(u,v, variance, radius);
outputImage.pixel(xOffset,yOffset).r = pix.r;
outputImage.pixel(xOffset,yOffset).g = pix.g;
outputImage.pixel(xOffset,yOffset).b = pix.b;
outputImage.pixel(xOffset,yOffset).a = pix.a;
// useful for debugging
// outputImage.pixel(xOffset,yOffset).r = interImage.pixel(xOffset, yOffset).r;
// outputImage.pixel(xOffset,yOffset).g = interImage.pixel(xOffset, yOffset).g;
// outputImage.pixel(xOffset,yOffset).b = interImage.pixel(xOffset, yOffset).b;
}
}
return 1;
}
int Image32::Contrast(const float& contrast,Image32& outputImage) const
{
int height = this->height();
int width = this->width();
outputImage.setSize(width, height);
float totalLum = 0.0;
int numPixels = 0;
for(int y=0; y<height; ++y){
for(int x=0; x<width; ++x){
int r = this->pixel(x,y).r;
int g = this->pixel(x,y).g;
int b = this->pixel(x,y).b;
float l = 0.30*r + 0.59*g + 0.11*b;
totalLum += l;
numPixels += 1;
}
}
float meanLum = totalLum / numPixels;
for(int y=0; y<height; ++y){
for(int x=0; x<width; ++x){
int r = this->pixel(x,y).r;
int g = this->pixel(x,y).g;
int b = this->pixel(x,y).b;
int a = this->pixel(x,y).a;
float l = 0.30*r + 0.59*g + 0.11*b;
float lDiff = l - meanLum;
float maxContrast;
if(lDiff >= 0){
maxContrast = (255 - (max(r,max(g,b)) - lDiff)) / lDiff;
}
else{
maxContrast = fabs(((min(r,min(g,b))) - lDiff) / lDiff); // lDiff is negative, so adding to minimum of r,g,b
}
float contrastClamped = min(maxContrast,contrast);
outputImage.pixel(x,y).r = contrastClamped*lDiff + (r-lDiff);
outputImage.pixel(x,y).g = contrastClamped*lDiff + (g-lDiff);
outputImage.pixel(x,y).b = contrastClamped*lDiff + (b-lDiff);
outputImage.pixel(x,y).a = a;
}
}
return 1;
}
int Image32::CrossDissolve(const Image32& source,const Image32& destination,const float& blendWeight,Image32& outputImage)
{
int height = destination.height();
int width = destination.width();
cout << "CrossDissolve" << "\n";
for(int y=0; y<height; ++y){
for(int x=0; x<width; ++x){
outputImage.pixel(x,y).r = (blendWeight * source.pixel(x,y).r) + ((1-blendWeight) * destination.pixel(x,y).r);
outputImage.pixel(x,y).g = (blendWeight * source.pixel(x,y).g) + ((1-blendWeight) * destination.pixel(x,y).g);
outputImage.pixel(x,y).b = (blendWeight * source.pixel(x,y).b) + ((1-blendWeight) * destination.pixel(x,y).b);
}
}
return 1;
}
int Image32::AddRandomNoise(const float& noise,Image32& outputImage) const
{
int height = this->height();
int width = this->width();
outputImage.setSize(width, height);
int noiseRange = (noise * 256) * 2;
for(int y=0; y<height; ++y){
for(int x=0; x<width; ++x){
int randNum;
if(noiseRange != 0) randNum = (rand() % noiseRange) - (.5*noiseRange);
else{ randNum = 0; }
outputImage.pixel(x,y).r = max(0,min(255,randNum + this->pixel(x,y).r));
outputImage.pixel(x,y).g = max(0,min(255,randNum + this->pixel(x,y).g));
outputImage.pixel(x,y).b = max(0,min(255,randNum + this->pixel(x,y).b));
outputImage.pixel(x,y).a = this->pixel(x,y).a;
}
}
return 1;
}
int Image32::SetAlpha(const Image32& matte)
{
int height = this->height();
int width = this->width();
for(int y=0; y<height; ++y){
for(int x=0; x<width; ++x){
this->pixel(x,y).a = matte.pixel(x,y).r; // one channel, all components should be equal
}
}
return 1;
}
int Image32::Crop(const int& x1,const int& y1,const int& x2,const int& y2,Image32& outputImage) const
{
int width = (x2 - x1) + 1;
int height = (y2 - y1) + 1;
outputImage.setSize(width,height);
int i = 0;
int j = 0;
for(int y=y1; y <= y2; ++y){
i = 0;
for(int x=x1; x <= x2; ++x){
outputImage.pixel(i,j).r = this->pixel(x,y).r;
outputImage.pixel(i,j).g = this->pixel(x,y).g;
outputImage.pixel(i,j).b = this->pixel(x,y).b;
outputImage.pixel(i,j).a = this->pixel(x,y).a;
i += 1;
}
j += 1;
}
return 1;
}
int Image32::Composite(const Image32& overlay,Image32& outputImage) const
{
int height = this->height();
int width = this->width();
int heightOverlay = overlay.height();
int widthOverlay = overlay.width();
outputImage.setSize(width, height);
for(int y=0; y<height; ++y){
for(int x=0; x<width; ++x){
int alpha256 = overlay.pixel(x,y).a;
float alpha = (float) alpha256 / 255.0;
outputImage.pixel(x,y).r = alpha*(overlay.pixel(x,y).r) + (1.0-alpha)*(this->pixel(x,y).r);
outputImage.pixel(x,y).g = alpha*(overlay.pixel(x,y).g) + (1.0-alpha)*(this->pixel(x,y).g);
outputImage.pixel(x,y).b = alpha*(overlay.pixel(x,y).b) + (1.0-alpha)*(this->pixel(x,y).b);
outputImage.pixel(x,y).a = 255;
}
}
return 1;
}
int Image32::Saturate(const float& saturation,Image32& outputImage) const
{
int height = this->height();
int width = this->width();
outputImage.setSize(width, height);
for(int y=0; y<height; ++y){
for(int x=0; x<width; ++x){
int r = this->pixel(x,y).r;
int g = this->pixel(x,y).g;
int b = this->pixel(x,y).b;
float l = 0.30*r + 0.59*g + 0.11*b;
float rDiff = r-l;
float gDiff = g-l;
float bDiff = b-l;
bool rOverflow = (r-rDiff) + rDiff*saturation > 255 || (r-rDiff) + rDiff*saturation < 0;
bool gOverflow = (g-gDiff) + gDiff*saturation > 255 || (g-gDiff) + gDiff*saturation < 0;
bool bOverflow = (b-bDiff) + bDiff*saturation > 255 || (b-bDiff) + bDiff*saturation < 0;
float satClamped = saturation; // if no overflows, satClamped is saturation
if(rOverflow){ // if r overflows, clamp sat to max so r doesn't overflow
satClamped = min((r-rDiff), 255-(r-rDiff)) / rDiff;
}
if(gOverflow){ // if g overflows, clamp sat to max so g doesn't overflow (or satClamped if less)
satClamped = min(min((g-gDiff), 255-(g-gDiff)) / gDiff, satClamped);
}
if(bOverflow){ // if b overflows, clamp sat to max so b doesn't overflow (or satClamped if less)
satClamped = min(min((b-bDiff), 255-(b-bDiff)) / bDiff, satClamped);
}
outputImage.pixel(x,y).r = satClamped*rDiff + (r-rDiff);
outputImage.pixel(x,y).g = satClamped*gDiff + (g-gDiff);
outputImage.pixel(x,y).b = satClamped*bDiff + (b-bDiff);
outputImage.pixel(x,y).a = this->pixel(x,y).a;
}
}
return 1;
}
int Image32::Luminance(Image32& outputImage) const
{
int height = this->height();
int width = this->width();
outputImage.setSize(width, height);
for(int y=0; y<height; ++y){
for(int x=0; x<width; ++x){
int r = this->pixel(x,y).r;
int g = this->pixel(x,y).g;
int b = this->pixel(x,y).b;
int l = int(0.30*r + 0.59*g + 0.11*b);
outputImage.pixel(x,y).r = l;
outputImage.pixel(x,y).g = l;
outputImage.pixel(x,y).b = l;
outputImage.pixel(x,y).a = this->pixel(x,y).a;
}
}
return 1;
}
int Image32::OrderedDither2X2(const int& bits,Image32& outputImage) const
{
int height = this->height();
int width = this->width();
int i;
int j;
float D[2][2];
D[0][0] = 1.0;
D[0][1] = 3.0;
D[1][0] = 4.0;
D[1][1] = 2.0;
Image32 interImage;
interImage.setSize(width,height);
float scaler255 = (255.0/pow(2,bits-1));
this->Quantize(bits,interImage);
for(int y=0; y<height; ++y){
for (int x = 0; x<width; ++x){
i = x % 2;
j = y % 2;
float r = float(this->pixel(x,y).r) / 255.0;
float g = float(this->pixel(x,y).g) / 255.0;
float b = float(this->pixel(x,y).b) / 255.0;
float cR = r*pow(2,bits-1);
float cG = g*pow(2,bits-1);
float cB = b*pow(2,bits-1);
float eR = cR - floor(cR);
float eG = cG - floor(cG);
float eB = cB - floor(cB);
if(eR > (D[i][j] / 8)) {outputImage.pixel(x,y).r = int(ceil(cR)*scaler255);}
else{outputImage.pixel(x,y).r = int(floor(cR) * scaler255);}
if(eG > (D[i][j] / 8)) {outputImage.pixel(x,y).g = int(ceil(cG)*scaler255);}
else{outputImage.pixel(x,y).g = int(floor(cG) * scaler255);}
if(eB > (D[i][j] / 8)) {outputImage.pixel(x,y).b = int(ceil(cB)*scaler255);}
else{outputImage.pixel(x,y).b = int(floor(cB) * scaler255);}
outputImage.pixel(x,y).a = this->pixel(x,y).a;
}
}
return 1;
}
int Image32::ScaleBilinear(const float& scaleFactor,Image32& outputImage) const
{
int widthSRC = this->width();
int heightSRC = this->height();
int widthDST = int(floor(widthSRC * scaleFactor + 0.5));
int heightDST = int(floor(heightSRC * scaleFactor + 0.5));
outputImage.setSize(widthDST, heightDST);
for(int yDST=0; yDST<heightDST-(int)scaleFactor; ++yDST){
for(int xDST=0; xDST<widthDST-(int)scaleFactor; ++xDST){
outputImage.pixel(xDST, yDST) = this->BilinearSample(((float)xDST / scaleFactor),((float)yDST / scaleFactor));
}
}
return 1;
}
int Image32::ScaleGaussian(const float& scaleFactor,Image32& outputImage) const
{
int widthSRC = this->width();
int heightSRC = this->height();
int widthDST = int(floor((float)widthSRC * scaleFactor)-ceil(scaleFactor));
int heightDST = int(floor((float)heightSRC * scaleFactor)-ceil(scaleFactor));
outputImage.setSize(widthDST, heightDST);
float variance = 1.0 / scaleFactor;
float r = 3.0;
for(int yDST=0; yDST < heightDST; ++yDST){
for(int xDST=0; xDST < widthDST; ++xDST){
outputImage.pixel(xDST, yDST) = this->GaussianSample(((float)xDST / scaleFactor), ((float)yDST / scaleFactor), variance, r);
}
}
return 1;
}
int Image32::Blur3X3(Image32& outputImage) const
{
int width = this->width();
int height = this->height();
for(int y=0; y<height; ++y){
for(int x=0; x<width; ++x){
float denominator;
bool leftBorder = (x==0);
bool rightBorder = (x == width-1);
bool bottomBorder = (y == height-1);
bool xBorder = leftBorder || rightBorder;
bool yBorder = ( y==0 || y == (height-1));
if(xBorder || yBorder){
outputImage.pixel(x,y).r = this->pixel(x,y).r;
outputImage.pixel(x,y).g = this->pixel(x,y).g;
outputImage.pixel(x,y).b = this->pixel(x,y).b;
}
else{
denominator = 16;
float topR = (this->pixel(x-1,y-1).r + 2*this->pixel(x,y-1).r + this->pixel(x+1,y-1).r) / (denominator);
float middleR = (2*this->pixel(x-1,y).r + 4*this->pixel(x,y).r + 2*this->pixel(x+1,y).r) / (denominator);
float bottomR = (this->pixel(x-1,y+1).r + 2*this->pixel(x,y+1).r + this->pixel(x+1,y+1).r) / (denominator);
outputImage.pixel(x,y).r = topR + middleR + bottomR;
float topG = (this->pixel(x-1,y-1).g + 2*this->pixel(x,y-1).g + this->pixel(x+1,y-1).g) / (denominator);
float middleG = (2*this->pixel(x-1,y).g + 4*this->pixel(x,y).g + 2*this->pixel(x+1,y).g) / (denominator);
float bottomG = (this->pixel(x-1,y+1).g + 2*this->pixel(x,y+1).g + this->pixel(x+1,y+1).g) / (denominator);
outputImage.pixel(x,y).g = topG + middleG + bottomG;
float topB = (this->pixel(x-1,y-1).b + 2*this->pixel(x,y-1).b + this->pixel(x+1,y-1).b) / (denominator);
float middleB = (2*this->pixel(x-1,y).b + 4*this->pixel(x,y).b + 2*this->pixel(x+1,y).b) / (denominator);
float bottomB = (this->pixel(x-1,y+1).b + 2*this->pixel(x,y+1).b + this->pixel(x+1,y+1).b) / (denominator);
outputImage.pixel(x,y).b = topB + middleB + bottomB;
}
outputImage.pixel(x,y).a = this->pixel(x,y).a;
}
}
return 1;
}
int Image32::FloydSteinbergDither(const int& bits,Image32& outputImage) const
{
int height = this->height();
int width = this->width();
float alpha = 7/16;
float beta = 3/16;
float gamma = 5/16;
float delta = 1/16;
this->Quantize(bits,outputImage);
for (int y = 0; y < height; ++y){
for (int x = 0; x < width; ++x){
float eR = this->pixel(x,y).r - outputImage.pixel(x,y).r;
float eG = this->pixel(x,y).g - outputImage.pixel(x,y).g;
float eB = this->pixel(x,y).b - outputImage.pixel(x,y).b;
if(y+1 < height){
outputImage.pixel(x,y+1).r = max(0,min(255,int(outputImage.pixel(x,y+1).r + alpha * eR)));
outputImage.pixel(x,y+1).g = max(0,min(255,int(outputImage.pixel(x,y+1).g + alpha * eG)));
outputImage.pixel(x,y+1).b = max(0,min(255,int(outputImage.pixel(x,y+1).b + alpha * eB)));
}
if(x+1 < width && y > 0){
outputImage.pixel(x+1,y-1).r = max(0,min(255,int(outputImage.pixel(x+1,y-1).r + beta * eR)));
outputImage.pixel(x+1,y-1).g = max(0,min(255,int(outputImage.pixel(x+1,y-1).g + beta * eG)));
outputImage.pixel(x+1,y-1).b = max(0,min(255,int(outputImage.pixel(x+1,y-1).b + beta * eB)));
}
if(x+1 < width){
outputImage.pixel(x+1,y).r = max(0,min(255,int(outputImage.pixel(x+1,y).r + gamma * eR)));
outputImage.pixel(x+1,y).g = max(0,min(255,int(outputImage.pixel(x+1,y).g + gamma * eG)));
outputImage.pixel(x+1,y).b = max(0,min(255,int(outputImage.pixel(x+1,y).b + gamma * eB)));
}
if(x+1 < width && y+1 < height){
outputImage.pixel(x+1,y+1).r = max(0,min(255,int(outputImage.pixel(x+1,y+1).r + delta * eR)));
outputImage.pixel(x+1,y+1).g = max(0,min(255,int(outputImage.pixel(x+1,y+1).g + delta * eG)));
outputImage.pixel(x+1,y+1).b = max(0,min(255,int(outputImage.pixel(x+1,y+1).b + delta * eB)));
}
}
}
return 1;
}
