二、图像处理-编程知识

待完善

一、图片缩放

import org.bytedeco.opencv.global.opencv_imgcodecs;
import org.bytedeco.opencv.global.opencv_imgproc;
import org.bytedeco.opencv.opencv_core.Mat;
import org.bytedeco.opencv.opencv_core.Size;public class ImageResizer {public static void main(String[] args) {// 加载图片Mat image = opencv_imgcodecs.imread("E://app/images/222.jpg");// 创建MatMat resizedImage = new Mat();// 设置缩放大小Size size = new Size(100, 100);// 缩放图片， 参数分别是 原图片、新创建的mat、缩放大小opencv_imgproc.resize(image, resizedImage, size);// 写图片opencv_imgcodecs.imwrite("E://app/images/resized.jpg", resizedImage);}
}

二、图片旋转

import org.bytedeco.opencv.global.opencv_imgcodecs;
import org.bytedeco.opencv.global.opencv_imgproc;
import org.bytedeco.opencv.opencv_core.Mat;
import org.bytedeco.opencv.opencv_core.Point2f;public class ImageResizer {public static void main(String[] args) {// 加载图片Mat image = opencv_imgcodecs.imread("E://app/images/222.jpg");Mat rotatedImage = new Mat();double angle = 90.0;// 获取图片中心点Point2f center = new Point2f(image.cols() / 2, image.rows() / 2);// 三个参数： 中心点，旋转角度， 图片比例Mat rotationMatrix = opencv_imgproc.getRotationMatrix2D(center, angle, 1.0);// 旋转opencv_imgproc.warpAffine(image, rotatedImage, rotationMatrix, image.size());// 写图片opencv_imgcodecs.imwrite("E://app/images/rotated3.jpg", rotatedImage);}
}

三、边缘检测

import org.bytedeco.opencv.global.opencv_imgcodecs;
import org.bytedeco.opencv.global.opencv_imgproc;
import org.bytedeco.opencv.opencv_core.Mat;public class ImageResizer {public static void main(String[] args) {// 加载图片Mat image = opencv_imgcodecs.imread("E://app/images/222.jpg");Mat grayImage = new Mat();Mat cannyImage = new Mat();// 灰度设置opencv_imgproc.cvtColor(image, grayImage, opencv_imgproc.COLOR_BGR2GRAY);// 边缘检测opencv_imgproc.Canny(grayImage, cannyImage, 100, 200);opencv_imgcodecs.imwrite("E://app/images/edges.jpg", grayImage);opencv_imgcodecs.imwrite("E://app/images/edges33.jpg", cannyImage);}
}

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四、图像腐蚀

import org.bytedeco.opencv.global.opencv_imgcodecs;
import org.bytedeco.opencv.global.opencv_imgproc;
import org.bytedeco.opencv.opencv_core.Mat;
import org.bytedeco.opencv.opencv_core.Size;public class ImageResizer {public static void main(String[] args) {// 加载图片Mat image = opencv_imgcodecs.imread("E://app/images/222.jpg");Mat grayImage = new Mat();// 腐蚀程度Mat element = opencv_imgproc.getStructuringElement(opencv_imgproc.MORPH_RECT, new Size(15, 15));// 腐蚀opencv_imgproc.erode(image, grayImage, element);opencv_imgcodecs.imwrite("E://app/images/eroded.jpg", grayImage);}
}

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五、图像膨胀

import org.bytedeco.javacv.Java2DFrameConverter;
import org.bytedeco.javacv.OpenCVFrameConverter;
import org.bytedeco.opencv.global.opencv_imgproc;
import org.bytedeco.opencv.opencv_core.Mat;
import org.bytedeco.opencv.opencv_core.Size;import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;public class ImageResizer {public static void main(String[] args) {try {// 加载图像BufferedImage img = ImageIO.read(new File("E://app/images/222.jpg"));Java2DFrameConverter java2DFrameConverter = new Java2DFrameConverter();Mat inputMat = new OpenCVFrameConverter.ToMat().convert(java2DFrameConverter.convert(img));// 定义核Mat kernel = opencv_imgproc.getStructuringElement(opencv_imgproc.MORPH_RECT, new Size(15, 15));// 膨胀操作Mat outputMat = new Mat();opencv_imgproc.dilate(inputMat, outputMat, kernel);// 保存图像Java2DFrameConverter java2DFrameConverterOutput = new Java2DFrameConverter();BufferedImage outputImg = java2DFrameConverterOutput.convert(new OpenCVFrameConverter.ToMat().convert(outputMat));ImageIO.write(outputImg, "png", new File("E://app/images/output.png"));} catch (IOException e) {e.printStackTrace();}}
}

六、裁剪图片

public class ImageResizer {public static void main(String[] args) {// 读取图像Mat src = opencv_imgcodecs.imread("E://app/images/111.jpg");// 定义矩形区域Rect roi = new Rect(200, 100, 500, 500);Rect roi2 = new Rect(100, 100, 500, 500);// 裁剪图像Mat cropped = new Mat(src, roi);Mat cropped2 = new Mat(src, roi2);// 保存图像opencv_imgcodecs.imwrite("E://app/images/output444.png", cropped);opencv_imgcodecs.imwrite("E://app/images/output555.png", cropped2);}
}

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七、翻转图像

import org.bytedeco.opencv.global.opencv_core;
import org.bytedeco.opencv.global.opencv_imgcodecs;
import org.bytedeco.opencv.opencv_core.Mat;public class ImageResizer {public static void main(String[] args) {// 读取图像Mat src = opencv_imgcodecs.imread("E://app/images/222.jpg");// 翻转图像Mat dst = new Mat();opencv_core.flip(src, dst, 1);opencv_imgcodecs.imwrite("E://app/images/output555.png", dst);}
}

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八、添加文字

import org.bytedeco.opencv.global.opencv_imgcodecs;
import org.bytedeco.opencv.global.opencv_imgproc;
import org.bytedeco.opencv.opencv_core.Mat;
import org.bytedeco.opencv.opencv_core.Point;
import org.bytedeco.opencv.opencv_core.Scalar;import static org.bytedeco.opencv.global.opencv_imgproc.FONT_HERSHEY_DUPLEX;public class ImageResizer {public static void main(String[] args) {// 读取图像Mat image1 = opencv_imgcodecs.imread("E://app/images/111.jpg");// 设置文字内容和位置String text = "Hello, World!";Point textOrg = new Point(50, 50);// 在图像上添加文字//img – 显示文字所在图像.//text – 待显示的文字.//org – 文字在图像中的左下角 坐标.// fontFace – 字体类型， 可选择字体：FONT_HERSHEY_SIMPLEX, FONT_HERSHEY_PLAIN, FONT_HERSHEY_DUPLEX,FONT_HERSHEY_COMPLEX, FONT_HERSHEY_TRIPLEX, FONT_HERSHEY_COMPLEX_SMALL, FONT_HERSHEY_SCRIPT_SIMPLEX, orFONT_HERSHEY_SCRIPT_COMPLEX,以上所有类型都可以配合 FONT_HERSHEY_ITALIC使用，产生斜体效果。//fontScale – 字体大小，该值和字体内置大小相乘得到字体大小//color – 文本颜色（默认颜色存储通道为BGR）//thickness – 写字的线的粗细，类似于0.38的笔尖和0.5的笔尖// lineType – 线性.// booopencv_imgproc.putText(image1, text, textOrg, FONT_HERSHEY_DUPLEX, 2.0, new Scalar(250), 1,8, false);// 保存带有文字的图像opencv_imgcodecs.imwrite("E://app/images/output.png", image1);}
}

九、添加水印

import org.bytedeco.opencv.global.opencv_core;
import org.bytedeco.opencv.global.opencv_imgcodecs;
import org.bytedeco.opencv.global.opencv_imgproc;
import org.bytedeco.opencv.opencv_core.Mat;
import org.bytedeco.opencv.opencv_core.Size;public class ImageResizer {public static void main(String[] args) {// 读取图像Mat image = opencv_imgcodecs.imread("E://app/images/111.jpg");// 读取水印图像Mat watermark = opencv_imgcodecs.imread("E://app/images/666.jpg");Size size = new Size(1000, 1000);// 两张图片大小必须一致Mat resizedImage = new Mat();Mat waterResizedImage = new Mat();opencv_imgproc.resize(image, resizedImage, size);opencv_imgproc.resize(watermark, waterResizedImage, size);// 将水印图像复制到原始图像上Mat image_with_watermark = new Mat();opencv_core.addWeighted(resizedImage, 0.7, waterResizedImage, 0.3, 0, image_with_watermark);// 保存带有文字的图像opencv_imgcodecs.imwrite("E://app/images/output.png", image_with_watermark);}
}

十、模糊

import org.bytedeco.opencv.global.opencv_core;
import org.bytedeco.opencv.global.opencv_imgcodecs;
import org.bytedeco.opencv.global.opencv_imgproc;
import org.bytedeco.opencv.opencv_core.Mat;
import org.bytedeco.opencv.opencv_core.Size;public class ImageResizer {public static void main(String[] args) {// 读取图像Mat image = opencv_imgcodecs.imread("E://app/images/222.jpg");Mat dst = new Mat();opencv_imgproc.GaussianBlur(image, dst, new Size(15, 15), 0, 0, opencv_core.BORDER_DEFAULT);// 保存带有文字的图像opencv_imgcodecs.imwrite("E://app/images/output.jpg", dst);}
}

十一、锐化

import org.bytedeco.opencv.global.opencv_core;
import org.bytedeco.opencv.global.opencv_imgcodecs;
import org.bytedeco.opencv.global.opencv_imgproc;
import org.bytedeco.opencv.opencv_core.Mat;
import org.bytedeco.opencv.opencv_core.Size;public class ImageResizer {public static void main(String[] args) {// 读取图像Mat image = opencv_imgcodecs.imread("E://app/images/222.jpg");Mat dst = new Mat();Mat sharpen = new Mat();opencv_imgproc.GaussianBlur(image, sharpen, new Size(0, 0), 3);opencv_core.addWeighted(image, 1.5, sharpen, -0.5, 0, dst);// 保存带有文字的图像opencv_imgcodecs.imwrite("E://app/images/output.jpg", dst);}
}

十二、颜色

import org.bytedeco.opencv.global.opencv_imgcodecs;
import org.bytedeco.opencv.global.opencv_imgproc;
import org.bytedeco.opencv.opencv_core.Mat;public class ImageResizer {public static void main(String[] args) {// 读取图像Mat image = opencv_imgcodecs.imread("E://app/images/222.jpg");Mat dst = new Mat();opencv_imgproc.cvtColor(image, dst, opencv_imgproc.COLOR_RGB2XYZ);// 保存带有文字的图像opencv_imgcodecs.imwrite("E://app/images/output.jpg", dst);}
}