人脸识别横向图片无法识别问题

人脸库注册时会发现有些图片属性是横向的，需要旋转90度或者其他角度才行，具体实现方法如下：

public static void main(String[] args) throws Exception {
    File file = new File("C:\\userPhoto\\20180830161212.jpg");
    Metadata metadata = JpegMetadataReader.readMetadata(file);
    Directory directory = metadata.getFirstDirectoryOfType(ExifDirectoryBase.class);
    int orientation=0;
    if(directory != null && directory.containsTag(ExifDirectoryBase.TAG_ORIENTATION)){ // Exif信息中有保存方向,把信息复制到缩略图
        orientation = directory.getInt(ExifDirectoryBase.TAG_ORIENTATION); // 原图片的方向信息
        System.out.println(orientation);
    }
    int angle = 0;
   if(6 == orientation ){
        angle = 90;
   }else if( 3 == orientation){
        angle = 180;
   }else if( 8 == orientation){
        angle = 270;
   }
   BufferedImage src = ImageIO.read(file);
    BufferedImage des = RotateImage.Rotate(src, angle);
    ImageIO.write(des,"jpg", new File("C:\\userPhoto\\80.jpg"));

//    File file = new File("C:\\userPhoto\\038056103630658124.jpg");
//
//    Metadata metadata = ImageMetadataReader.readMetadata(file);
//    for (Directory directory : metadata.getDirectories()) {
//        for (Tag tag : directory.getTags()) {
//            System.out.format("[%s] - %s = %s",
//                directory.getName(), tag.getTagName(), tag.getDescription());
//        }
//        if (directory.hasErrors()) {
//            for (String error : directory.getErrors()) {
//                System.err.format("ERROR: %s", error);
//            }
//        }
//    }
    }

package com.hisun.common;
import java.awt.*;
import java.awt.image.BufferedImage;

/**
* Created by Administrator on 2015/12/15.
*/
public class RotateImage {
    public static BufferedImage Rotate(Image src, int angel) {
        int src_width = src.getWidth(null);
        int src_height = src.getHeight(null);
        // calculate the new image size
        Rectangle rect_des = CalcRotatedSize(new Rectangle(new Dimension(
                src_width, src_height)), angel);

        BufferedImage res = null;
        res = new BufferedImage(rect_des.width, rect_des.height,
                BufferedImage.TYPE_INT_RGB);
        Graphics2D g2 = res.createGraphics();
        // transform
        g2.translate((rect_des.width - src_width) / 2,
                (rect_des.height - src_height) / 2);
        g2.rotate(Math.toRadians(angel), src_width / 2, src_height / 2);

        g2.drawImage(src, null, null);
        return res;
    }

    public static Rectangle CalcRotatedSize(Rectangle src, int angel) {
        if (angel >= 90) {
            if(angel / 90 % 2 == 1){
                int temp = src.height;
                src.height = src.width;
                src.width = temp;
            }
            angel = angel % 90;
        }
        double r = Math.sqrt(src.height * src.height + src.width * src.width) / 2;
        double len = 2 * Math.sin(Math.toRadians(angel) / 2) * r;
        double angel_alpha = (Math.PI - Math.toRadians(angel)) / 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 Rectangle(new Dimension(des_width, des_height));
    }
}

需要的jar包：metadata-extractor-2.9.1

xmpcore-5.1.2

人脸识别横向图片无法识别问题

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