javaopencvfeature-descriptor

How to create a mat from bits in opencv for java?

can somebody explain how to create a binary mat with values from a bitstring?

For example, I want to create my Mat from bitstrings 11110000and 01010101, so I have a mat object with 2 rows and 1 colum.

For this I initialize the mat-object with Mat mat = new Mat(2,1,CvType.CV_8UC1);

Can I convert these strings to a byte array and use mat.put(0,0,bytearray) or is there something else that I must conside?

Later I want to use this approach to create my own binary descriptor that can compare wth other descriptors, extracted by ÒRB. With norm(descA,descB,NORM_HAMMING)

thank you and best regards

Solution

  • You can use Byte.parseByte() with a radix of 2 e.g byte b = Byte.parseByte(str, 2); to first convert it to byte and then create a byte array and then covert it to Mat object as below:

    Mat mat = Imgcodecs.imdecode(new MatOfByte(byteArray), Imgcodecs.CV_LOAD_IMAGE_UNCHANGED);