Open xu000yp opened 2 years ago
Kumataro
commented
2 years ago For centos, following packages are needed.
$ sudo yum -y install freetype-devel
$ sudo yum -y install harfbuzz-develAfter that, pkg-config can be detected these.
$ pkg-config harfbuzz --modversion
1.7.5
$ pkg-config freetype2 --modversion
20.0.14
xu000yp
commented
2 years ago 您好，我安装了一下freetype-devel和harfbuzz-devel，发现已经存在最新的了版本和你发的是一样的。 是我在cmake编译的时候命令不对吗？ 还是有别的地方需要我去修改？ 麻烦指点一下，谢谢
Kumataro
commented
2 years ago I see CMakeFile of imgcodecs. Like it , freetype2 wrapper is able to to build for java too I think.
If It's OK, in Step 3, CMake log shows it.
-- freetype2: YES (ver 20.0.14)
-- harfbuzz: YES (ver 1.7.5)And
-- OpenCV modules:
-- To be built: aruco barcode ... freetype ...https://github.com/opencv/opencv_contrib/blob/4.x/modules/freetype/CMakeLists.txt#L24
- ocv_define_module(freetype opencv_core opencv_imgproc WRAP python)
+ ocv_define_module(freetype opencv_core opencv_imgproc WRAP python java)make.If it works not good, it is better to re-create build directory.
[kmtr@localhost build]$ jar tf bin/opencv-453.jar | grep freetype
org/opencv/freetype/
org/opencv/freetype/FreeType2.java
org/opencv/freetype/Freetype.java
org/opencv/freetype/FreeType2.class
org/opencv/freetype/Freetype.classI'm a little unsure about java environment. It is difficult to support to run application in JAVA. I'm sorry. (So that, I can not enable java wrapper for freetype2 wrapper as default.)
I think it similar to imgcodecs, because it is used external libraries(libjpeg, libpng, libwebp, ...). If there are any trouble, please reference around it.
xu000yp
commented
2 years ago 谢谢
xu000yp
commented
2 years ago 您好，不好意思 `还要麻烦您，opencv在java中启动的时候，会通过 static {
System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
}
` 来加载opencv，但是我没有找到freeType要如何加载，所以我通过freetype里面的创建方法来创建对象。
但是在运行的时候报错，编译到opencv中Freetype类如下，
`// // Source code recreated from a .class file by IntelliJ IDEA // (powered by Fernflower decompiler) //
package org.opencv.freetype;
public class Freetype { public Freetype() { }
public static FreeType2 createFreeType2() {
return FreeType2.__fromPtr__(createFreeType2_0());
}
private static native long createFreeType2_0();}
，我在外面调用opencv.jar中的Freetype创建对象， FreeType2 freeType2 = Freetype.createFreeType2(); ，会报错如下, java.lang.UnsatisfiedLinkError: org.opencv.freetype.Freetype.createFreeType2_0()J
at org.opencv.freetype.Freetype.createFreeType2_0(Native Method)
at org.opencv.freetype.Freetype.createFreeType2(Freetype.java:23) ,我在网上查了一下说是没有找到freeType.so文件，然后 我把Freetype类修改了一下并重新编译成class文件放到opencv.jar中,如下： package org.opencv.freetype;
public class Freetype { public Freetype() { }
static {
System.load("/usr/lib/libfreetype.so");
}
public static FreeType2 createFreeType2() {
return FreeType2.__fromPtr__(createFreeType2_0());
}
private static native long createFreeType2_0();}`, 但是我感觉创建createFreeType2方式是不是需要变更一下，我不知道要如何才能创建出调用freeType2的对象来调用其内部的方法，求解惑，谢谢~
Kumataro
commented
2 years ago This is sample code.
I tried it with ubuntu 22.04-dev and OpenCV/Contriv 4.x. Could you try with it ?
SimpleSample.class : SimpleSample.java
javac -classpath lib/opencv-455.jar SimpleSample.java
run : SimpleSample.class
java -Djava.library.path='/usr/local/share/java/opencv4/' -classpath .:lib/opencv-455.jar SimpleSampleimport org.opencv.core.Core;
import org.opencv.core.Mat;
import org.opencv.core.CvType;
import org.opencv.core.Scalar;
import org.opencv.core.Size;
import org.opencv.core.Point;
import org.opencv.imgproc.Imgproc;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.freetype.Freetype;
import org.opencv.freetype.FreeType2;
class SimpleSample {
static{ System.loadLibrary(Core.NATIVE_LIBRARY_NAME); }
public static void main(String[] args) {
String fontData = "/usr/share/fonts/truetype/freefont/FreeSansBoldOblique.ttf";
String text = "Funny text inside the box";
int fontHeight = 40;
int thickness = 1;
int linestyle = 16;
Mat img = Mat.zeros(600, 800, CvType.CV_8UC3);
int[] baseline = {0};
FreeType2 ft2 = Freetype.createFreeType2();
ft2.loadFontData (fontData, 0);
Size textSize = ft2.getTextSize( text, fontHeight, thickness, baseline);
if ( thickness < 0 ){
baseline[0] += thickness;
}
// center the text
Point textOrg = new Point ((img.cols() - textSize.width) / 2,
(img.rows() + textSize.height) / 2);
// draw the box
Imgproc.rectangle(img,
new Point(textOrg.x + 0, textOrg.y + baseline[0]),
new Point(textOrg.x + textSize.width, textOrg.y - textSize.height),
new Scalar(0,255,0),
1,
8);
Imgproc.line(img,
new Point(textOrg.x + 0, textOrg.y + thickness),
new Point(textOrg.x + textSize.width, textOrg.y + thickness),
new Scalar(0,0,255),
1,
8);
ft2.putText(img,
text,
textOrg,
fontHeight,
new Scalar(255,255,255),
thickness,
linestyle,
true );
Imgcodecs.imwrite("output.png", img);
System.out.println(textSize);
}
}好的 我试一下 谢谢
opencv、opencv-contrib都是4.5.3版本。
在centos7上，用cmake编译opencv和opencv-contrib，我想把opencv-contrib中的freetype模块功能编译出来，但是编译出来的jar中，总是没有freetype，求指点，谢谢！
操作步骤：
sudo yum -y install epel-release sudo yum -y install gtk2-devel sudo yum install -y libpng-devel sudo yum install -y jasper-devel sudo yum install -y openexr-devel sudo yum install -y libwebp-devel sudo yum -y install libjpeg-turbo-devel sudo yum -y install libtiff-devel sudo yum -y install tbb-devel eigen3-devel sudo yum -y install boost boost-thread boost-devel sudo yum -y install libv4l-devel yum install python-devel numpy yum install -y unzip zip yum install ant yum install epel-release rpm --import http://li.nux.ro/download/nux/RPM-GPG-KEY-nux.ro rpm -Uvh http://li.nux.ro/download/nux/dextop/el7/x86_64/nux-dextop-release-0-5.el7.nux.noarch.rpm yum install ffmpeg ffmpeg-devel -y
然后再 /root/opencv/build/bin里面找到 jar包下载下来，看里面没有 freeType，请指点，最好有详细操作步骤及编译命令，谢谢~