在本文中, 我们将学习如何使用OpenCv库增强图像的清晰度。
为了提高清晰度, 我们将使用高斯滤波器。高斯滤镜可减少图像中的噪声并使它看起来更好(或更高分辨率)。
首先, 我们需要为Java设置OpenCV, 我们建议使用eclipse进行相同的设置, 因为它易于使用和设置。http://docs.opencv.org/2.4/doc/tutorials/introduction/java_eclipse/java_eclipse.html
锐度增强所需的方法。
GaussianBlur(源, 目标, 新的Size(0, 0), sigmaX)–此方法位于OpenCv的Imgproc程序包中。
语法如下:
Imgproc.GaussianBlur(source, destination, new Size(0, 0), sigmaX)
parameters:
source - source image
destination - destination image
new Size(0, 0) - Gaussian kernel size
sigmaX - Gaussian kernel standard deviation in X direction
addWeighted(InputArray src1, alpha, src2, beta, gamma, OutputArray dst)-此方法位于OpenCv的Core程序包中。
语法如下:
Core.addWeighted(InputArray src1, alpha, src2, beta, gamma, OutputArray dst)
parameters:
src1 - first input array
alpha - weight of the first array elements
src2 - second input array of the same size and channel number as src1
beta - weight of the second array elements
gamma - scalar added to each sum
dst - output array that has the same size and number of channels as the input arrays
imread()-此方法用于将图像读取为由OpenCV渲染的Mat对象。
语法如下:
Imgcodecs.imread(filename);
parameters:
filename: filename of the image file.If the image is
in another directory whole path of image must be mentioned.
imwrite()-此方法用于将Mat对象写入图像文件。
语法如下:
Imgcodecs.imwrite(filename, mat_img);
parameters:
filename: filename of the image file.If the image is
in another directory whole path of image must be mentioned.
mat_img: resultant mat object.
package ocv;
import org.opencv.core.Core;
import org.opencv.core.Mat;
import org.opencv.core.Size;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.imgproc.Imgproc;
public class Main {
public static void main( String[] args )
{
try {
//For proper execution of native libraries
//Core.NATIVE_LIBRARY_NAME must be loaded before
//calling any of the opencv methods
System.loadLibrary( Core.NATIVE_LIBRARY_NAME );
//Input image
Mat source =
Imgcodecs.imread( "E://input.jpg" , Imgcodecs.CV_LOAD_IMAGE_COLOR);
Mat destination = new Mat(source.rows(), source.cols(), source.type());
//filtering
Imgproc.GaussianBlur(source, destination, new Size( 0 , 0 ), 10 );
Core.addWeighted(source, 1.5 , destination, - 0.5 , 0 , destination);
//writing output image
Imgcodecs.imwrite( "E://output.jpg" , destination);
} catch (Exception e) {
}
}
}
注意:该代码无法在在线IDE中使用, 因为它需要硬盘中的图像。
输出如下:
input.jpg
output.jpg
Try to notice minor improvement in resolution
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