Bilinear interpolation: Difference between revisions
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i38r =: mp (C38r mp~ n38r)
</lang>
=={{header|Java}}==
{{trans|Kotlin}}
<lang Java>import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
public class BilinearInterpolation {
/* gets the 'n'th byte of a 4-byte integer */
private static int get(int self, int n) {
return (self >> (n * 8)) & 0xFF;
}
private static float lerp(float s, float e, float t) {
return s + (e - s) * t;
}
private static float blerp(final Float c00, float c10, float c01, float c11, float tx, float ty) {
return lerp(lerp(c00, c10, tx), lerp(c01, c11, tx), ty);
}
private static BufferedImage scale(BufferedImage self, float scaleX, float scaleY) {
int newWidth = (int) (self.getWidth() * scaleX);
int newHeight = (int) (self.getHeight() * scaleY);
BufferedImage newImage = new BufferedImage(newWidth, newHeight, self.getType());
for (int x = 0; x < newWidth; ++x) {
for (int y = 0; y < newHeight; ++y) {
float gx = ((float) x) / newWidth * (self.getWidth() - 1);
float gy = ((float) y) / newHeight * (self.getHeight() - 1);
int gxi = (int) gx;
int gyi = (int) gy;
int rgb = 0;
int c00 = self.getRGB(gxi, gyi);
int c10 = self.getRGB(gxi + 1, gyi);
int c01 = self.getRGB(gxi, gyi + 1);
int c11 = self.getRGB(gxi + 1, gyi + 1);
for (int i = 0; i <= 2; ++i) {
float b00 = get(c00, i);
float b10 = get(c10, i);
float b01 = get(c01, i);
float b11 = get(c11, i);
int ble = ((int) blerp(b00, b10, b01, b11, gx - gxi, gy - gyi)) << (8 * i);
rgb = rgb | ble;
}
newImage.setRGB(x, y, rgb);
}
}
return newImage;
}
public static void main(String[] args) throws IOException {
File lenna = new File("Lenna100.jpg");
BufferedImage image = ImageIO.read(lenna);
BufferedImage image2 = scale(image, 1.6f, 1.6f);
File lenna2 = new File("Lenna100_larger.jpg");
ImageIO.write(image2, "jpg", lenna2);
}
}</lang>
=={{header|Julia}}==
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