Kotlin Bytedeco OpenCV 图像图像57 图像ROI

1 添加依赖

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xmlns="http://maven.apache.org/POM/4.0.0"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.xu</groupId>
    <artifactId>KotlinOpenCV</artifactId>
    <version>1.0</version>

    <properties>
        <kotlin.version>2.0.0</kotlin.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <kotlin.code.style>official</kotlin.code.style>
        <kotlin.compiler.jvmTarget>1.8</kotlin.compiler.jvmTarget>
    </properties>

    <repositories>
        <repository>
            <id>mavenCentral</id>
            <url>https://repo1.maven.org/maven2/</url>
        </repository>
    </repositories>

    <dependencies>

        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>5.8.29</version>
        </dependency>

        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-compress</artifactId>
            <version>1.27.0</version>
        </dependency>

        <dependency>
            <groupId>org.tukaani</groupId>
            <artifactId>xz</artifactId>
            <version>1.10</version>
        </dependency>

        <dependency>
            <groupId>org.jetbrains.kotlinx</groupId>
            <artifactId>kotlinx-coroutines-core</artifactId>
            <version>1.9.0-RC</version>
        </dependency>

        <!--        <dependency>-->
        <!--            <groupId>org.opencv</groupId>-->
        <!--            <artifactId>opencv</artifactId>-->
        <!--            <version>4100</version>-->
        <!--            <scope>system</scope>-->
        <!--            <systemPath>${project.basedir}/lib/opencv/opencv-4100.jar</systemPath>-->
        <!--        </dependency>-->

        <dependency>
            <groupId>org.bytedeco</groupId>
            <artifactId>opencv-platform</artifactId>
            <version>4.10.0-1.5.11</version>
        </dependency>

        <!--        <dependency>-->
        <!--            <groupId>org.bytedeco</groupId>-->
        <!--            <artifactId>ffmpeg-platform</artifactId>-->
        <!--            <version>6.1.1-1.5.10</version>-->
        <!--        </dependency>-->

        <dependency>
            <groupId>org.jetbrains.kotlin</groupId>
            <artifactId>kotlin-test-junit5</artifactId>
            <version>2.0.0</version>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter</artifactId>
            <version>5.10.0</version>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.jetbrains.kotlin</groupId>
            <artifactId>kotlin-stdlib</artifactId>
            <version>2.0.0</version>
        </dependency>

    </dependencies>

    <build>
        <sourceDirectory>src/main/kotlin</sourceDirectory>
        <testSourceDirectory>src/test/kotlin</testSourceDirectory>
        <plugins>
            <plugin>
                <groupId>org.jetbrains.kotlin</groupId>
                <artifactId>kotlin-maven-plugin</artifactId>
                <version>2.0.0</version>
                <executions>
                    <execution>
                        <id>compile</id>
                        <phase>compile</phase>
                        <goals>
                            <goal>compile</goal>
                        </goals>
                    </execution>
                    <execution>
                        <id>test-compile</id>
                        <phase>test-compile</phase>
                        <goals>
                            <goal>test-compile</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
            <plugin>
                <artifactId>maven-surefire-plugin</artifactId>
                <version>2.22.2</version>
            </plugin>
            <plugin>
                <artifactId>maven-failsafe-plugin</artifactId>
                <version>2.22.2</version>
            </plugin>
            <plugin>
                <groupId>org.codehaus.mojo</groupId>
                <artifactId>exec-maven-plugin</artifactId>
                <version>1.6.0</version>
                <configuration>
                    <mainClass>MainKt</mainClass>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

2 测试代码

package com.xu.com.xu.trans

import org.bytedeco.javacpp.Loader
import org.bytedeco.javacpp.Pointer
import org.bytedeco.opencv.global.opencv_core
import org.bytedeco.opencv.global.opencv_highgui
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.Point2f
import org.bytedeco.opencv.opencv_core.Rect
import org.bytedeco.opencv.opencv_core.Scalar
import org.bytedeco.opencv.opencv_core.Size
import org.bytedeco.opencv.opencv_highgui.MouseCallback

object Cropping {

    init {
        Loader.load(opencv_core::class.java)
    }

    // 使用 Kotlin 的数据类来存储鼠标状态
    data class MouseState(
        val image: Mat
    ) {
        lateinit var temp: Mat
        var second: Point = Point()
        var first: Point = Point()
        var drawing: Boolean = false
    }

    @JvmStatic
    fun main(args: Array<String>) {
        roi()
    }

    /**
     * 裁切
     *
     * @since 2025年1月20日12点33分
     */
    private fun roi() {
        // 读取图像
        val src = opencv_imgcodecs.imread("C:\\Users\\hyacinth\\Desktop\\1.png")
        if (src == null || src.empty()) {
            return
        }
        val (size, point) = select(src)
        println("${point.x()},${point.x()}")
        val dst = Mat()
        opencv_imgproc.getRectSubPix(
            src,
            size, // 裁剪大小
            Point2f(point), // 裁剪图片中心
            dst
        )
        // 显示ROI
        opencv_highgui.imshow("src", src)
        opencv_highgui.imshow("dst", dst)
        opencv_highgui.waitKey(0)
    }

    /**
     * 仿射变换 图像裁剪
     *
     * @since 2025年1月20日12点33分
     */
    private fun roi2() {
        // 读取图像
        val src = opencv_imgcodecs.imread("C:\\Users\\hyacinth\\Desktop\\1.png")
        if (src == null || src.empty()) {
            return
        }
        // 定义裁剪区域
        val rect = Rect(100, 100, 400, 200)
        // 应用透视变换
        val images = Mat(src, rect)
        // 显示结果
        opencv_highgui.imshow("ORACLE", src)
        opencv_highgui.imshow("CROPPING", images)
        opencv_highgui.waitKey(0)
    }


    /**
     * 仿射变换 图像裁剪
     *
     * @since 2025年1月20日12点33分
     */
    private fun roi3(type: Int) {
        // 读取图像
        val src = opencv_imgcodecs.imread("C:\\Users\\hyacinth\\Desktop\\1.png")
        if (src == null || src.empty()) {
            return
        }
        val dst = Mat()
        opencv_imgproc.getRectSubPix(
            src,
            Size(400, 200), // 裁剪大小
            Point2f((src.rows() / 2.0).toFloat(), (src.cols() / 2.0).toFloat()), // 裁剪图片中心
            dst
        )
        // 显示ROI
        opencv_highgui.imshow("src", src)
        opencv_highgui.imshow("dst", dst)
        opencv_highgui.waitKey(0)
    }

    /**
     * 画矩形
     *
     * @since 2025年1月20日12点33分
     */
    private fun select(image: Mat): Pair<Size, Point2f> {
        val window = "Drawing"
        // 创建窗口
        opencv_highgui.namedWindow(window, opencv_highgui.WINDOW_AUTOSIZE)
        // 创建状态对象
        val state = MouseState(image)
        // 用于保存临时画布
        state.temp = image.clone()
        // 创建鼠标回调对象
        val callback = object : MouseCallback() {
            override fun call(event: Int, x: Int, y: Int, flags: Int, params: Pointer?) {
                when (event) {
                    // 鼠标按钮按下
                    opencv_highgui.EVENT_LBUTTONDOWN -> {
                        state.drawing = true
                        state.first.x(x)
                        state.first.y(y)
                    }
                    // 鼠标移动
                    opencv_highgui.EVENT_MOUSEMOVE -> {
                        if (state.drawing) {
                            // 复制原始画布
                            state.temp = state.image.clone()
                            state.second.x(x)
                            state.second.y(y)
                            // 在临时画布上绘制矩形(蓝色预览)
                            opencv_imgproc.rectangle(
                                state.temp,
                                Rect(Point(state.first), Point(state.second)),
                                Scalar(255.0, 0.0, 0.0, 0.0)
                            )
                            // 显示预览
                            opencv_highgui.imshow(window, state.temp)
                        }
                    }
                    // 鼠标按钮回弹
                    opencv_highgui.EVENT_LBUTTONUP -> {
                        state.drawing = false
                        state.second.x(x)
                        state.second.y(y)
                        // 在最终画布上绘制矩形(绿色)
                        opencv_imgproc.rectangle(
                            state.image,
                            Rect(Point(state.first), Point(state.second)),
                            Scalar(0.0, 255.0, 0.0, 0.0)
                        )
                        // 显示最终画布
                        opencv_highgui.imshow(window, state.image)
                    }
                }
            }
        }
        // 设置鼠标回调
        opencv_highgui.setMouseCallback(window, callback, null)
        // 主循环
        while (true) {
            opencv_highgui.imshow(window, state.temp)
            if (opencv_highgui.waitKey(1).toChar() == 27.toChar()) {
                opencv_highgui.destroyWindow(window)
                return Pair(
                    Size(
                        state.second.x() - state.first.x(),
                        state.second.y() - state.first.y()
                    ),
                    Point2f(
                        (0.5 * state.second.x() + 0.5 * state.first.x()).toFloat(),
                        (0.5 * state.second.y() + 0.5 * state.first.y()).toFloat()
                    )
                )
            }
        }
    }

}

3 测试结果