Opencv Convert Mat To Image Java

If you want to display the contents of the resultant mat object using an awt swings window you need to convert the mat object to an object of the class java awt image bufferedimage.

Opencv convert mat to image java. In order to convert a color image to grayscale image using opencv we read the image into bufferedimage and convert it into mat object. Bufferedimage is a data structure from java to store images. I ve not used pixelreader before so i am unsure wether or not i am using it correctly. This can be used by a graphics object to draw the image.

The resulting matrix produces a black image. The input and output image are displayed in the java ui using swing. Convert an image to binary data in java. Its syntax is given below file input new file digital image processing jpg.

So that s how we can display images. I am unable to successfully convert a javafx scene image image to a org opencv core mat. Using the code convert mat to bufferedimage. To implement findcontours gray contours cv retr list cv chain approx simple.

This example by daniel baggio was taken directly from this stackexchange answer but has been reposted for visibility. I m trying to implement the example code of the following question by using opencv java api. Mat data structure has image data image type gray bgr height width. The input image is a jpg file saved in the computer.

In java i used this syntax imgproc findcontours gray contours new mat imgproc retr list imgproc chain approx simple. Convert image to byte array in java. If you try to read an image using the opencv imread method it returns a mat object. Convert buffered image to mat.

Here is my code. Converting an mat object to an bufferedimage object. This class takes an mat object and returns the bufferedimage object used by the javax swing libraries. So now contours should be list matofpoint contours new arraylist matofpoint.

And we are making it visible by setvisible. Mat is a data structure from opencv to process image. I am trying to create a helper function using opencv java api that would process an input image and return the output byte array.