java 签名抠图

1import com.drew.imaging.ImageMetadataReader;
2import com.drew.imaging.ImageProcessingException;
3import com.drew.metadata.Directory;
4import com.drew.metadata.Metadata;
5import com.drew.metadata.Tag;
6
7import javax.imageio.ImageIO;
8import javax.swing.*;
9import java.awt.*;
10import java.awt.image.BufferedImage;
11import java.io.*;
12
13public class ImageUtils {
14
15
16    /**
17     * 图片去白色的背景，并裁切
18     *
19     * @param image 图片
20     * @param range 范围 1-255 越大 容错越高 去掉的背景越多
21     * @return 图片
22     * @throws Exception 异常
23     */
24    public static byte[] transferAlpha(Image image, InputStream in, int range) throws Exception {
25        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
26        try {
27            ImageIcon imageIcon = new ImageIcon(image);
28            BufferedImage bufferedImage = new BufferedImage(imageIcon
29                    .getIconWidth(), imageIcon.getIconHeight(),
30                    BufferedImage.TYPE_4BYTE_ABGR);
31            Graphics2D g2D = (Graphics2D) bufferedImage.getGraphics();
32            g2D.drawImage(imageIcon.getImage(), 0, 0, imageIcon
33                    .getImageObserver());
34            int alpha = 0;
35            int minX = bufferedImage.getWidth();
36            int minY = bufferedImage.getHeight();
37            int maxX = 0;
38            int maxY = 0;
39
40            for (int j1 = bufferedImage.getMinY(); j1 < bufferedImage
41                    .getHeight(); j1++) {
42                for (int j2 = bufferedImage.getMinX(); j2 < bufferedImage
43                        .getWidth(); j2++) {
44                    int rgb = bufferedImage.getRGB(j2, j1);
45
46                    int R = (rgb & 0xff0000) >> 16;
47                    int G = (rgb & 0xff00) >> 8;
48                    int B = (rgb & 0xff);
49                    if (((255 - R) < range) && ((255 - G) < range) && ((255 - B) < range)) { //去除白色背景；
50                        rgb = ((alpha + 1) << 24) | (rgb & 0x00ffffff);
51                    } else {
52                        minX = minX <= j2 ? minX : j2;
53                        minY = minY <= j1 ? minY : j1;
54                        maxX = maxX >= j2 ? maxX : j2;
55                        maxY = maxY >= j1 ? maxY : j1;
56                    }
57                    bufferedImage.setRGB(j2, j1, rgb);
58                }
59            }
60            int width = maxX - minX;
61            int height = maxY - minY;
62            BufferedImage sub = bufferedImage.getSubimage(minX, minY, width, height);
63            int degree = getDegree(in);
64            sub = rotateImage(sub,degree);
65            ImageIO.write(sub, "png", byteArrayOutputStream);
66
67        } catch (Exception e) {
68            e.printStackTrace();
69            throw e;
70        }
71
72        return byteArrayOutputStream.toByteArray();
73    }
74
75    /**
76     * 图片旋转
77     * @param bufferedimage bufferedimage
78     * @param degree 旋转的角度
79     * @return BufferedImage
80     */
81    public static BufferedImage rotateImage(final BufferedImage bufferedimage,
82                                            final int degree) {
83        int w = bufferedimage.getWidth();
84        int h = bufferedimage.getHeight();
85        Rectangle rect_des = CalcRotatedSize(new Rectangle(new Dimension(
86                w, h)), degree);
87        int type = bufferedimage.getColorModel().getTransparency();
88        BufferedImage img;
89        Graphics2D graphics2d;
90        (graphics2d = (img = new BufferedImage(rect_des.width, rect_des.height, type))
91                .createGraphics()).setRenderingHint(
92                RenderingHints.KEY_INTERPOLATION,
93                RenderingHints.VALUE_INTERPOLATION_BILINEAR);
94        graphics2d.translate((rect_des.width - w) / 2,
95                (rect_des.height - h) / 2);
96        graphics2d.rotate(Math.toRadians(degree), w / 2, h / 2);
97        graphics2d.drawImage(bufferedimage, 0, 0, null);
98        graphics2d.dispose();
99        return img;
100    }
101
102    /**
103     * 计算旋转后图像的大小
104     * @param src  Rectangle
105     * @param degree 旋转的角度
106     * @return Rectangle
107     */
108    public static Rectangle CalcRotatedSize(Rectangle src, int degree) {
109        if (degree >= 90) {
110            if(degree / 90 % 2 == 1){
111                int temp = src.height;
112                src.height = src.width;
113                src.width = temp;
114            }
115            degree = degree % 90;
116        }
117
118        double r = Math.sqrt(src.height * src.height + src.width * src.width) / 2;
119        double len = 2 * Math.sin(Math.toRadians(degree) / 2) * r;
120        double angel_alpha = (Math.PI - Math.toRadians(degree)) / 2;
121        double angel_dalta_width = Math.atan((double) src.height / src.width);
122        double angel_dalta_height = Math.atan((double) src.width / src.height);
123
124        int len_dalta_width = (int) (len * Math.cos(Math.PI - angel_alpha
125                - angel_dalta_width));
126        int len_dalta_height = (int) (len * Math.cos(Math.PI - angel_alpha
127                - angel_dalta_height));
128        int des_width = src.width + len_dalta_width * 2;
129        int des_height = src.height + len_dalta_height * 2;
130        return new java.awt.Rectangle(new Dimension(des_width, des_height));
131    }
132
133    /**
134     * byte[] ------>BufferedImage
135     *
136     * @param byteImage byteImage
137     * @return return
138     * @throws IOException IOException
139     */
140    public static BufferedImage ByteToBufferedImage(byte[] byteImage) throws IOException {
141        ByteArrayInputStream in = new ByteArrayInputStream(byteImage);
142        return ImageIO.read(in);
143    }
144
145
146    /**
147     * 获取照片信息的旋转角度
148     * @param inputStream 照片的路径
149     * @return 角度
150     */
151    public static int getDegree(InputStream inputStream) {
152        try {
153            Metadata metadata = ImageMetadataReader.readMetadata(new BufferedInputStream(inputStream),true);
154            for (Directory directory : metadata.getDirectories()) {
155                for (Tag tag : directory.getTags()) {
156                    if ("Orientation".equals(tag.getTagName())) {
157                        return turn(getOrientation(tag.getDescription()));
158                    }
159                }
160            }
161        } catch (ImageProcessingException e) {
162            e.printStackTrace();
163            return 0;
164        } catch (IOException e) {
165            e.printStackTrace();
166            return 0;
167        }
168        return 0;
169    }
170
171    /**
172     * 获取旋转的角度
173     * @param orientation orientation
174     * @return 旋转的角度
175     */
176    public static int turn(int orientation) {
177        Integer turn = 360;
178        if (orientation == 0 || orientation == 1) {
179            turn = 360;
180        } else if (orientation == 3) {
181            turn = 180;
182        } else if (orientation == 6) {
183            turn = 90;
184        } else if (orientation == 8) {
185            turn = 270;
186        }
187        return turn;
188    }
189
190    /**
191     * 根据图片自带的旋转的信息 获取 orientation
192     * @param orientation orientation
193     * @return orientation
194     */
195    public static int getOrientation(String orientation) {
196        int tag = 0;
197        if ("Top, left side (Horizontal / normal)".equalsIgnoreCase(orientation)) {
198            tag = 1;
199        } else if ("Top, right side (Mirror horizontal)".equalsIgnoreCase(orientation)) {
200            tag = 2;
201        } else if ("Bottom, right side (Rotate 180)".equalsIgnoreCase(orientation)) {
202            tag = 3;
203        } else if ("Bottom, left side (Mirror vertical)".equalsIgnoreCase(orientation)) {
204            tag = 4;
205        } else if ("Left side, top (Mirror horizontal and rotate 270 CW)".equalsIgnoreCase(orientation)) {
206            tag = 5;
207        } else if ("Right side, top (Rotate 90 CW)".equalsIgnoreCase(orientation)) {
208            tag = 6;
209        } else if ("Right side, bottom (Mirror horizontal and rotate 90 CW)".equalsIgnoreCase(orientation)) {
210            tag = 7;
211        } else if ("Left side, bottom (Rotate 270 CW)".equalsIgnoreCase(orientation)) {
212            tag = 8;
213        }
214        return tag;
215    }
216}