java 云摄像头接入 java操作摄像头

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网络安全守护神 2024-07-26 11:00:34

文章标签 java 云摄像头接入 java 二维码图片合成相机 文章分类 Java 后端开发

java操作二维码生成与已有图片合成与解析+pc摄像头抓拍

效果

pom中依赖

<dependency>
        <groupId>com.google.zxing</groupId>
        <artifactId>core</artifactId>
        <version>3.3.3</version>
    </dependency>
    <dependency>
        <groupId>com.google.zxing</groupId>
        <artifactId>javase</artifactId>
        <version>3.3.0</version>
    </dependency>
    <dependency>
        <groupId>org.apache.commons</groupId>
        <artifactId>commons-lang3</artifactId>
        <version>3.9</version>
    </dependency>
    <dependency>
        <groupId>org.bytedeco</groupId>
        <artifactId>javacv-platform</artifactId>
        <version>1.4.3</version>
    </dependency>

代码实现

Camera类

import org.bytedeco.javacv.OpenCVFrameGrabber;

public class Camera {
    /**
     * 是否存储图片
     */
    public static enum Img {
        save,
        nosave
    }

    /**
     * 是否正常启动摄像头 true:正常启动/false:异常启动
     */
    public static boolean InitCamera;

    /**
     * 摄像头资源
     */
    public static OpenCVFrameGrabber grabber;

    /**
     * 是否保存图片,默认不保存
     */
    public static Img saveImage = Img.nosave;

    /**
     * 开始摄像头
     *
     * @throws Exception 摄像头初始化失败！
     */
    public static void StartCamera() throws Exception {
        grabber.start();
    }

    /**
     * 停止摄像头
     *
     * @throws Exception 摄像头关闭异常！
     */
    public static void StopCamera() throws Exception {
        grabber.stop();
    }
}

工具类

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

public class BaseUtil {
    /**
     * 二维码信息和图片合成新的图片
     *
     * @param qrInfo    二维码文字信息内容
     * @param imagePath 输入图片文件路径
     * @param toPath    合成图片文件路径【注：路径后缀为.png】
     * @param cachePath 缓存目录路径
     * @return 是否操作成功
     */
    public static boolean createQrMergeImage(String qrInfo, String imagePath, String toPath, String cachePath) {
        try {
            //判断二维码信息是否为空
            if (qrInfo == null || "".equals(qrInfo.trim())) {
                System.err.println("Parameter \'qrInfo\' cannot be empty");
                return false;
            }

            //判断图片路径是否为空
            if (imagePath == null || "".equals(imagePath.trim())) {
                System.err.println("Parameter \'imagePath\' cannot be empty");
                return false;
            }

            //判断图片文件是否存在
            File imageFile = new File(imagePath);
            if (!imageFile.exists()) {
                System.err.println("The image file is not exits");
                return false;
            }

            //判断缓存目录是否为空
            if (cachePath == null || "".equals(cachePath.trim())) {
                System.err.println("Parameter \'cachePath\' cannot be empty");
                return false;
            }

            //判断缓存目录是否存在
            File cacheFile = new File(cachePath);
            if (!cacheFile.exists() || !cacheFile.isDirectory()) {
                System.err.println("cachePath is not exits or is not directory");
                return false;
            }

            //判断输出文件路径是否为空
            if (toPath == null || "".equals(toPath.trim())) {
                System.err.println("Parameter \'toPath\' cannot be empty");
                return false;
            }

            //判断输出文件路径是否.png结尾
            if (!toPath.endsWith(".png")) {
                System.err.println("Parameter \'toPath\' is not end \'.png\'");
                return false;
            }

            //判断输出文件是否存在
            File toFile = new File(toPath);
            if (!toFile.exists()) {
                toFile.createNewFile();
            }

            //判断是否为图片
            try {
                Image image = ImageIO.read(imageFile);
                if (image == null) {
                    System.err.println("The image file is not real picture");
                    return false;
                }
            } catch (IOException ex) {
                System.err.println("The image file is not real picture");
                return false;
            }

            //设置ImageIO的缓存目录
            ImageIO.setCacheDirectory(cacheFile);

            //获取图片的高
            BufferedImage bufferedImage = ImageIO.read(new FileInputStream(imageFile));
            int height = bufferedImage.getHeight();
            if (height <= 0) {
                System.err.println("Get image file hight error");
                return false;
            }

            //生成等高的二维码
            MultiFormatWriter multiFormatWriter = new MultiFormatWriter();
            Map hints = new HashMap();
            //设置UTF-8， 防止中文乱码
            hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
            //设置二维码四周白色区域的大小
            hints.put(EncodeHintType.MARGIN, 0);
            //设置二维码的容错性
            hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
            //画二维码，记得调用multiFormatWriter.encode()时最后要带上hints参数，不然上面设置无效
            BitMatrix bitMatrix = multiFormatWriter.encode(qrInfo, BarcodeFormat.QR_CODE, height, height, hints);
            //开始画二维码
            BufferedImage bufferedImageQr = MatrixToImageWriter.toBufferedImage(bitMatrix);
            //判断生成的二维码是否为空
            if (bufferedImageQr == null) {
                System.err.println("Create Buffer Image Qr error");
                return false;
            }

            //合并图片与生成的二维码
            int w1 = bufferedImage.getWidth();
            int h1 = bufferedImage.getHeight();
            int w2 = bufferedImageQr.getWidth();
            int h2 = bufferedImageQr.getHeight();
            // 从图片中读取RGB
            int[] ImageArrayOne = new int[w1 * h1];
            ImageArrayOne = bufferedImage.getRGB(0, 0, w1, h1, ImageArrayOne, 0, w1); // 逐行扫描图像中各个像素的RGB到数组中
            int[] ImageArrayTwo = new int[w2 * h2];
            ImageArrayTwo = bufferedImageQr.getRGB(0, 0, w2, h2, ImageArrayTwo, 0, w2);

            // 生成新图片
            BufferedImage DestImage = null;
            DestImage = new BufferedImage(w1 + w2, h1, BufferedImage.TYPE_INT_RGB);
            DestImage.setRGB(0, 0, w1, h1, ImageArrayOne, 0, w1);
            DestImage.setRGB(w1, 0, w2, h2, ImageArrayTwo, 0, w2);
            ImageIO.write(DestImage, "png", new File(toPath));
            return true;
        } catch (Exception e) {
            return false;
        }
    }

    /**
     * 解析图片中的二维码文本信息
     *
     * @param imagePath 含二维码图片的路径
     * @param cachePath 缓存目录路径
     * @return 解析出的二维码文本信息
     */
    public static String decodeQRInfoFromImage(String imagePath, String cachePath) {
        String qrInfo = null;
        try {
            //判断图片路径是否为空
            if (imagePath == null || "".equals(imagePath.trim())) {
                System.err.println("Parameter \'imagePath\' cannot be empty");
                qrInfo = null;
                return qrInfo;
            }

            //判断图片文件是否存在
            File imageFile = new File(imagePath);
            if (!imageFile.exists()) {
                System.err.println("The image file is not exits");
                qrInfo = null;
                return qrInfo;
            }

            //判断是否为图片
            try {
                Image image = ImageIO.read(imageFile);
                if (image == null) {
                    System.err.println("The image file is not real picture");
                    qrInfo = null;
                    return qrInfo;
                }
            } catch (IOException ex) {
                System.err.println("The image file is not real picture");
                qrInfo = null;
                return qrInfo;
            }

            //判断缓存目录是否为空
            if (cachePath == null || "".equals(cachePath.trim())) {
                System.err.println("Parameter \'cachePath\' cannot be empty");
                qrInfo = null;
                return qrInfo;
            }

            //判断缓存目录是否存在
            File cacheFile = new File(cachePath);
            if (!cacheFile.exists() || !cacheFile.isDirectory()) {
                System.err.println("cachePath is not exits or is not directory");
                qrInfo = null;
                return qrInfo;
            }

            ImageIO.setCacheDirectory(new File(cachePath));
            BufferedImage image = ImageIO.read(new File(imagePath));
            LuminanceSource source = new BufferedImageLuminanceSource(image);
            Binarizer binarizer = new HybridBinarizer(source);
            BinaryBitmap binaryBitmap = new BinaryBitmap(binarizer);
            Map<DecodeHintType, Object> hints = new HashMap<DecodeHintType, Object>();
            hints.put(DecodeHintType.CHARACTER_SET, "UTF-8");
            com.google.zxing.Result result = new MultiFormatReader().decode(binaryBitmap, hints);
            qrInfo = result.getText();
            return qrInfo;
        } catch (Exception e) {
            qrInfo = null;
            return qrInfo;
        }
    }

    /**
     * 调用相机拍照
     *
     * @param imagePath    存储拍摄照片的路径
     * @param cameraNumber 相机的编号【-1手动选择】【0表示本机相机】【1~n表示usb摄像头（这里限制n最大为5）】
     * @return 是否完成拍照
     */
    public static boolean takePhoto(String imagePath, int cameraNumber) {
        try {
            //判断图片路径是否为空
            if (imagePath == null || "".equals(imagePath.trim())) {
                System.err.println("Parameter \'imagePath\' cannot be empty");
                return false;
            }

            //判断相机参数是否越界
            if (cameraNumber < -1 || cameraNumber > 5) {
                System.err.println("Parameter \'cameraNumber\' out range");
                return false;
            }

            //拍照并保存
            Camera.grabber = new OpenCVFrameGrabber(cameraNumber);
            Camera.StartCamera();
            Camera.InitCamera = true;
            OpenCVFrameGrabber grabber = Camera.grabber;
            OpenCVFrameConverter.ToIplImage converter = new OpenCVFrameConverter.ToIplImage();
            try {
                boolean imwrite = false;
                if (Camera.InitCamera) {
                    opencv_core.Mat mat = converter.convertToMat(grabber.grabFrame());
                    Camera.saveImage = Camera.Img.save;
                    if (Camera.saveImage == Camera.Img.save) {
                        imwrite = opencv_imgcodecs.imwrite(imagePath, mat);
                    }
                }
                Camera.StopCamera();
                return imwrite;
            } catch (Exception e) {
                System.err.println("take photo error");
                return false;
            }
        } catch (Exception e) {
            System.err.println("init camera error");
            Camera.InitCamera = false;
            return false;
        }
    }
}

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