建立本地网站,江苏城乡建设网站,网页制作与设计,什么是网络营销的核心工作Kotlin Bytedeco OpenCV 图像图像49 仿射变换 图像裁剪 1 添加依赖2 测试代码3 测试结果 在OpenCV中#xff0c;仿射变换#xff08;Affine Transformation#xff09;和透视变换#xff08;Perspective Transformation#xff09;是两种常用的图像几何变换方法。
变换方… Kotlin Bytedeco OpenCV 图像图像49 仿射变换 图像裁剪 1 添加依赖2 测试代码3 测试结果 在OpenCV中仿射变换Affine Transformation和透视变换Perspective Transformation是两种常用的图像几何变换方法。
变换方法适用场景仿射变换简单的几何变换平移、旋转、缩放、剪切。透视变换改变图像视角和模拟3D投影效果。
变换方法解释特点应用场景实现方法仿射变换仿射变换是一种线性变换它保持了图像中直线的直线性和平行线的平行性。常见的仿射变换包括平移、旋转、缩放、剪切等。输入空间和输出空间之间存在线性关系。直线和平行性在变换后保持不变但角度和长度可能发生改变。图像平移、旋转或缩放。图像对齐如在模板匹配中的坐标对齐。简单的几何变形如剪切变换。准备变换矩阵2x3。使用 OpenCV 的 cv2.warpAffine() 方法进行变换。透视变换透视变换是一种非线性变换用于将图像从一个平面映射到另一个平面。它允许改变图像的视角从而获得三维的透视效果。输入空间和输出空间之间是非线性的。直线保持直线但平行线不再平行。需要 4 对点来定义变换关系。图像校正如将拍摄的书本照片调整为平面图。视角转换如模拟3D效果或鸟瞰视图。投影变换如在增强现实中的投影映射。定义输入和输出平面上的 4 个对应点。使用 cv2.getPerspectiveTransform() 获取 3x3 的透视变换矩阵。使用 cv2.warpPerspective() 方法进行变换。
1 添加依赖
?xml version1.0 encodingUTF-8?
project xmlns:xsihttp://www.w3.org/2001/XMLSchema-instancexmlnshttp://maven.apache.org/POM/4.0.0xsi:schemaLocationhttp://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsdmodelVersion4.0.0/modelVersiongroupIdcom.xu/groupIdartifactIdKotlinOpenCV/artifactIdversion1.0/versionpropertieskotlin.version2.0.0/kotlin.versionproject.build.sourceEncodingUTF-8/project.build.sourceEncodingkotlin.code.styleofficial/kotlin.code.stylekotlin.compiler.jvmTarget1.8/kotlin.compiler.jvmTarget/propertiesrepositoriesrepositoryidmavenCentral/idurlhttps://repo1.maven.org/maven2//url/repository/repositoriesdependenciesdependencygroupIdcn.hutool/groupIdartifactIdhutool-all/artifactIdversion5.8.29/version/dependencydependencygroupIdorg.apache.commons/groupIdartifactIdcommons-compress/artifactIdversion1.27.0/version/dependencydependencygroupIdorg.tukaani/groupIdartifactIdxz/artifactIdversion1.10/version/dependencydependencygroupIdorg.jetbrains.kotlinx/groupIdartifactIdkotlinx-coroutines-core/artifactIdversion1.9.0-RC/version/dependency!-- dependency--!-- groupIdorg.opencv/groupId--!-- artifactIdopencv/artifactId--!-- version4100/version--!-- scopesystem/scope--!-- systemPath${project.basedir}/lib/opencv/opencv-4100.jar/systemPath--!-- /dependency--dependencygroupIdorg.bytedeco/groupIdartifactIdopencv-platform/artifactIdversion4.10.0-1.5.11/version/dependency!-- dependency--!-- groupIdorg.bytedeco/groupId--!-- artifactIdffmpeg-platform/artifactId--!-- version6.1.1-1.5.10/version--!-- /dependency--dependencygroupIdorg.jetbrains.kotlin/groupIdartifactIdkotlin-test-junit5/artifactIdversion2.0.0/versionscopetest/scope/dependencydependencygroupIdorg.junit.jupiter/groupIdartifactIdjunit-jupiter/artifactIdversion5.10.0/versionscopetest/scope/dependencydependencygroupIdorg.jetbrains.kotlin/groupIdartifactIdkotlin-stdlib/artifactIdversion2.0.0/version/dependency/dependenciesbuildsourceDirectorysrc/main/kotlin/sourceDirectorytestSourceDirectorysrc/test/kotlin/testSourceDirectorypluginsplugingroupIdorg.jetbrains.kotlin/groupIdartifactIdkotlin-maven-plugin/artifactIdversion2.0.0/versionexecutionsexecutionidcompile/idphasecompile/phasegoalsgoalcompile/goal/goals/executionexecutionidtest-compile/idphasetest-compile/phasegoalsgoaltest-compile/goal/goals/execution/executions/pluginpluginartifactIdmaven-surefire-plugin/artifactIdversion2.22.2/version/pluginpluginartifactIdmaven-failsafe-plugin/artifactIdversion2.22.2/version/pluginplugingroupIdorg.codehaus.mojo/groupIdartifactIdexec-maven-plugin/artifactIdversion1.6.0/versionconfigurationmainClassMainKt/mainClass/configuration/plugin/plugins/build/project2 测试代码
package com.xu.com.xu.transimport 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.Point2f
import org.bytedeco.opencv.opencv_core.Rect
import org.bytedeco.opencv.opencv_core.Sizeobject Affine {init {Loader.load(opencv_core::class.java)}JvmStaticfun main(args: ArrayString) {cropping1()}/*** 仿射变换 平移变换** since 2025年1月20日12点33分*/private fun move() {// 读取图像val src opencv_imgcodecs.imread(C:\\Users\\hyacinth\\Desktop\\1.png)if (src null || src.empty()) {return}// 创建源点矩阵三个点val mat1 Mat(1, 3, opencv_core.CV_32FC2)mat1.ptr(0, 0).putPointer(Point2f(0f, 0f))mat1.ptr(0, 1).putPointer(Point2f(src.cols() - 1f, 0f))mat1.ptr(0, 2).putPointer(Point2f(0f, src.rows() - 1f))// 创建目标点矩阵三个点val mat2 Mat(1, 3, opencv_core.CV_32FC2)mat2.ptr(0, 0).putPointer(Point2f(100f, 100f))mat2.ptr(0, 1).putPointer(Point2f(src.cols() 100f, 100f))mat2.ptr(0, 2).putPointer(Point2f(100f, src.rows() 100f))// 获取旋转矩阵val matrix opencv_imgproc.getAffineTransform(mat1, mat2)// 应用透视变换val images Mat()opencv_imgproc.warpAffine(src, images, matrix, src.size())// 显示结果opencv_highgui.imshow(MOVE, images)opencv_highgui.waitKey(0)}/*** 仿射变换 旋转变换** since 2025年1月20日12点33分*/private fun revolve() {// 读取图像val src opencv_imgcodecs.imread(C:\\Users\\hyacinth\\Desktop\\1.png)if (src null || src.empty()) {return}// 旋转中心val center Point2f((src.cols() / 2).toFloat(), (src.rows() / 2).toFloat())// 获取旋转矩阵val matrix opencv_imgproc.getRotationMatrix2D(center, 45.0, 0.5)// 应用透视变换val images Mat()opencv_imgproc.warpAffine(src, images, matrix, src.size())// 显示结果opencv_highgui.imshow(REVOLVE, images)opencv_highgui.waitKey(0)}/*** 仿射变换 图像缩放** since 2025年1月20日12点33分*/private fun zoom() {// 读取图像val src opencv_imgcodecs.imread(C:\\Users\\hyacinth\\Desktop\\1.png)if (src null || src.empty()) {return}// 旋转中心val center Point2f((src.cols() / 2).toFloat(), (src.rows() / 2).toFloat())// 获取旋转矩阵val matrix opencv_imgproc.getRotationMatrix2D(center, 0.0, 0.5)// 应用透视变换val images Mat()opencv_imgproc.warpAffine(src, images, matrix, src.size())// 显示结果opencv_highgui.imshow(REVOLVE, 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 cropping1() {// 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(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 cropping1(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ROIopencv_highgui.imshow(src, src)opencv_highgui.imshow(dst, dst)opencv_highgui.waitKey(0)}}3 测试结果
