1 package com.sxh.ocr.provider.common.util;
2
3 import org.apache.poi.util.IOUtils;
4 import org.opencv.core.CvType;
5 import org.opencv.core.Mat;
6 import org.opencv.core.MatOfByte;
7 import org.opencv.imgcodecs.Imgcodecs;
8 import org.springframework.util.Base64Utils;
9 import sun.misc.BASE64Decoder;
10
11 import javax.imageio.ImageIO;
12 import java.awt.*;
13 import java.awt.image.BufferedImage;
14 import java.awt.image.DataBufferByte;
15 import java.io.ByteArrayInputStream;
16 import java.io.IOException;
17 import java.io.InputStream;
18
19 /**
20 * 流处理工具
21 *
22 * @author simm
23 */
24 public class MyStreamUtils {
25 /**
26 * 转换成base64编码
27 *
28 * @param inputStream
29 * @return
30 * @throws IOException
31 */
32 public static String streamToBase64(InputStream inputStream) throws IOException {
33 return Base64Utils.encodeToString(IOUtils.toByteArray(inputStream));
34 }
35
36 /**
37 * 装换回编码
38 *
39 * @param correctMat
40 * @return
41 */
42 public static String catToBase64(Mat correctMat) {
43 return bufferToBase64(toByteArray(correctMat));
44 }
45
46 /**
47 * 转换成base64编码
48 *
49 * @param buffer
50 * @return
51 */
52 public static String bufferToBase64(byte[] buffer) {
53 return Base64Utils.encodeToString(buffer);
54 }
55
56 /**
57 * base64编码转换成字节数组
58 *
59 * @param base64Str
60 * @return
61 */
62 public static byte[] base64ToByteArray(String base64Str) {
63 return Base64Utils.decodeFromString(base64Str);
64 }
65
66 /**
67 * base64 编码转换为 BufferedImage
68 *
69 * @param base64
70 * @return
71 */
72 public static BufferedImage base64ToBufferedImage(String base64) {
73 BASE64Decoder decoder = new sun.misc.BASE64Decoder();
74 try {
75 byte[] bytes1 = decoder.decodeBuffer(base64);
76 ByteArrayInputStream bais = new ByteArrayInputStream(bytes1);
77 return ImageIO.read(bais);
78 } catch (IOException e) {
79 e.printStackTrace();
80 }
81 return null;
82 }
83
84 /**
85 * mat转换成bufferedImage
86 *
87 * @param matrix
88 * @return
89 */
90 public static byte[] toByteArray(Mat matrix) {
91 MatOfByte mob = new MatOfByte();
92 Imgcodecs.imencode(".jpg", matrix, mob);
93 return mob.toArray();
94 }
95
96 /**
97 * mat转换成bufferedImage
98 *
99 * @param matrix
100 * @return
101 */
102 public static BufferedImage toBufferedImage(Mat matrix) throws IOException {
103 byte[] buffer = toByteArray(matrix);
104 ByteArrayInputStream bais = new ByteArrayInputStream(buffer);
105 return ImageIO.read(bais);
106 }
107
108 /**
109 * base64转Mat
110 *
111 * @param base64
112 * @return
113 * @throws IOException
114 */
115 public static Mat base642Mat(String base64) throws IOException {
116
117 return bufImg2Mat(base64ToBufferedImage(base64), BufferedImage.TYPE_3BYTE_BGR, CvType.CV_8UC3);
118 }
119
120 /**
121 * BufferedImage转换成Mat
122 *
123 * @param original 要转换的BufferedImage
124 * @param imgType bufferedImage的类型 如 BufferedImage.TYPE_3BYTE_BGR
125 * @param matType 转换成mat的type 如 CvType.CV_8UC3
126 */
127 public static Mat bufImg2Mat(BufferedImage original, int imgType, int matType) {
128 if (original == null) {
129 throw new IllegalArgumentException("original == null");
130 }
131 // Don't convert if it already has correct type
132 if (original.getType() != imgType) {
133 // Create a buffered image
134 BufferedImage image = new BufferedImage(original.getWidth(), original.getHeight(), imgType);
135 // Draw the image onto the new buffer
136 Graphics2D g = image.createGraphics();
137 try {
138 g.setComposite(AlphaComposite.Src);
139 g.drawImage(original, 0, 0, null);
140 original = image;
141 }catch (Exception e){
142 e.printStackTrace();
143 }finally {
144 g.dispose();
145 }
146 }
147 byte[] pixels = ((DataBufferByte) original.getRaster().getDataBuffer()).getData();
148 Mat mat = Mat.eye(original.getHeight(), original.getWidth(), matType);
149 mat.put(0, 0, pixels);
150 return mat;
151 }
152 }
项目地址：https://github.com/git-simm/simm-framework