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How To Resize Image Using OpenCV

To Resize Image Using OpenCV Follow The Following Steps.

Step1. In The View Area Add ImageView Or Any Other Image Displaying View.

Step2. Make Sure You Select OpenCV Android SDK In The Library Manager.

Step3. In The Custom Imports Add The Following Classes From OpenCV.

import org.opencv.core.Mat;
import org.opencv.core.Size;
import org.opencv.android.Utils;
import android.graphics.Bitmap;
import org.opencv.imgproc.Imgproc;
import org.opencv.imgcodecs.Imgcodecs; 
import android.graphics.drawable.BitmapDrawable;

Step4. Load OpenCV C++ Binary Using The Following Code.

}
static {
System.loadLibrary("opencv_java4"); 
}
{

Step5. In Any Event You Want(OnCreate, OnButton Click Or Any Other Event) Where You Want To Resize The Image Use This Code. Read Comment's For Better Understanding.

//Get Bitmap From ImageView Called imageview1

Bitmap bitmap = ((BitmapDrawable) imageview1.getDrawable()).getBitmap();

//Initialize Mat Object For The Bitmap

Mat mat = new Mat();

//Convert The Bitmap From imageview1 To OpenCV Mat Object.
 
Utils.bitmapToMat(bitmap, mat);

//Initialize Mat Object For The Resized Image

Mat resizedmat = new Mat();

//Resize The Image From Mat Object With New Width 512 & Height 512

Imgproc.resize(mat, resizedmat, new Size(seekbar1.getProgress(), seekbar1.getProgress()));

//Create Bitmap From The Resized Mat Object Columns & Rows.

Bitmap resizedbitmap = Bitmap.createBitmap(resizedmat.cols(), resizedmat.rows(), Bitmap.Config.ARGB_8888);

//Convert The Resized Mat Object To Bitmap

Utils.matToBitmap(resizedmat, resizedbitmap);

//Display The Resized Bitmap In imageview1

imageview1.setImageBitmap(resizedbitmap);

//Release The Mat Objects To Prevent Memory Leaks

mat.release();
resizedmat.release();

OpenCV Image Resizer Sketchware Pro Project

#opencv_image_resizer_sk

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