java 签名抠图

2019独角兽企业重金招聘Python工程师标准>>>

import com.drew.imaging.ImageMetadataReader;
import com.drew.imaging.ImageProcessingException;
import com.drew.metadata.Directory;
import com.drew.metadata.Metadata;
import com.drew.metadata.Tag;import javax.imageio.ImageIO;
import javax.swing.*;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.*;public class ImageUtils {/*** 图片去白色的背景，并裁切** @param image 图片* @param range 范围 1-255 越大 容错越高 去掉的背景越多* @return 图片* @throws Exception 异常*/public static byte[] transferAlpha(Image image, InputStream in, int range) throws Exception {ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();try {ImageIcon imageIcon = new ImageIcon(image);BufferedImage bufferedImage = new BufferedImage(imageIcon.getIconWidth(), imageIcon.getIconHeight(),BufferedImage.TYPE_4BYTE_ABGR);Graphics2D g2D = (Graphics2D) bufferedImage.getGraphics();g2D.drawImage(imageIcon.getImage(), 0, 0, imageIcon.getImageObserver());int alpha = 0;int minX = bufferedImage.getWidth();int minY = bufferedImage.getHeight();int maxX = 0;int maxY = 0;for (int j1 = bufferedImage.getMinY(); j1 < bufferedImage.getHeight(); j1++) {for (int j2 = bufferedImage.getMinX(); j2 < bufferedImage.getWidth(); j2++) {int rgb = bufferedImage.getRGB(j2, j1);int R = (rgb & 0xff0000) >> 16;int G = (rgb & 0xff00) >> 8;int B = (rgb & 0xff);if (((255 - R) < range) && ((255 - G) < range) && ((255 - B) < range)) { //去除白色背景；rgb = ((alpha + 1) << 24) | (rgb & 0x00ffffff);} else {minX = minX <= j2 ? minX : j2;minY = minY <= j1 ? minY : j1;maxX = maxX >= j2 ? maxX : j2;maxY = maxY >= j1 ? maxY : j1;}bufferedImage.setRGB(j2, j1, rgb);}}int width = maxX - minX;int height = maxY - minY;BufferedImage sub = bufferedImage.getSubimage(minX, minY, width, height);int degree = getDegree(in);sub = rotateImage(sub,degree);ImageIO.write(sub, "png", byteArrayOutputStream);} catch (Exception e) {e.printStackTrace();throw e;}return byteArrayOutputStream.toByteArray();}/*** 图片旋转* @param bufferedimage bufferedimage* @param degree 旋转的角度* @return BufferedImage*/public static BufferedImage rotateImage(final BufferedImage bufferedimage,final int degree) {int w = bufferedimage.getWidth();int h = bufferedimage.getHeight();Rectangle rect_des = CalcRotatedSize(new Rectangle(new Dimension(w, h)), degree);int type = bufferedimage.getColorModel().getTransparency();BufferedImage img;Graphics2D graphics2d;(graphics2d = (img = new BufferedImage(rect_des.width, rect_des.height, type)).createGraphics()).setRenderingHint(RenderingHints.KEY_INTERPOLATION,RenderingHints.VALUE_INTERPOLATION_BILINEAR);graphics2d.translate((rect_des.width - w) / 2,(rect_des.height - h) / 2);graphics2d.rotate(Math.toRadians(degree), w / 2, h / 2);graphics2d.drawImage(bufferedimage, 0, 0, null);graphics2d.dispose();return img;}/*** 计算旋转后图像的大小* @param src  Rectangle* @param degree 旋转的角度* @return Rectangle*/public static Rectangle CalcRotatedSize(Rectangle src, int degree) {if (degree >= 90) {if(degree / 90 % 2 == 1){int temp = src.height;src.height = src.width;src.width = temp;}degree = degree % 90;}double r = Math.sqrt(src.height * src.height + src.width * src.width) / 2;double len = 2 * Math.sin(Math.toRadians(degree) / 2) * r;double angel_alpha = (Math.PI - Math.toRadians(degree)) / 2;double angel_dalta_width = Math.atan((double) src.height / src.width);double angel_dalta_height = Math.atan((double) src.width / src.height);int len_dalta_width = (int) (len * Math.cos(Math.PI - angel_alpha- angel_dalta_width));int len_dalta_height = (int) (len * Math.cos(Math.PI - angel_alpha- angel_dalta_height));int des_width = src.width + len_dalta_width * 2;int des_height = src.height + len_dalta_height * 2;return new java.awt.Rectangle(new Dimension(des_width, des_height));}/*** byte[] ------>BufferedImage** @param byteImage byteImage* @return return* @throws IOException IOException*/public static BufferedImage ByteToBufferedImage(byte[] byteImage) throws IOException {ByteArrayInputStream in = new ByteArrayInputStream(byteImage);return ImageIO.read(in);}/*** 获取照片信息的旋转角度* @param inputStream 照片的路径* @return 角度*/public static int getDegree(InputStream inputStream) {try {Metadata metadata = ImageMetadataReader.readMetadata(new BufferedInputStream(inputStream),true);for (Directory directory : metadata.getDirectories()) {for (Tag tag : directory.getTags()) {if ("Orientation".equals(tag.getTagName())) {return turn(getOrientation(tag.getDescription()));}}}} catch (ImageProcessingException e) {e.printStackTrace();return 0;} catch (IOException e) {e.printStackTrace();return 0;}return 0;}/*** 获取旋转的角度* @param orientation orientation* @return 旋转的角度*/public static int turn(int orientation) {Integer turn = 360;if (orientation == 0 || orientation == 1) {turn = 360;} else if (orientation == 3) {turn = 180;} else if (orientation == 6) {turn = 90;} else if (orientation == 8) {turn = 270;}return turn;}/*** 根据图片自带的旋转的信息 获取 orientation* @param orientation orientation* @return orientation*/public static int getOrientation(String orientation) {int tag = 0;if ("Top, left side (Horizontal / normal)".equalsIgnoreCase(orientation)) {tag = 1;} else if ("Top, right side (Mirror horizontal)".equalsIgnoreCase(orientation)) {tag = 2;} else if ("Bottom, right side (Rotate 180)".equalsIgnoreCase(orientation)) {tag = 3;} else if ("Bottom, left side (Mirror vertical)".equalsIgnoreCase(orientation)) {tag = 4;} else if ("Left side, top (Mirror horizontal and rotate 270 CW)".equalsIgnoreCase(orientation)) {tag = 5;} else if ("Right side, top (Rotate 90 CW)".equalsIgnoreCase(orientation)) {tag = 6;} else if ("Right side, bottom (Mirror horizontal and rotate 90 CW)".equalsIgnoreCase(orientation)) {tag = 7;} else if ("Left side, bottom (Rotate 270 CW)".equalsIgnoreCase(orientation)) {tag = 8;}return tag;}
}

转载于:https://my.oschina.net/alyouge/blog/702926

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