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How to alter the brightness of a grey scale image?
The equalizeHist() method of the Imgproc class accepts a greyscale image and equalizes its histogram, which will, in turn, normalizes the brightness and increases the contrast of the given image. This method accepts two parameters −
A Mat object representing the source image (greyscale).
A Mat object to save the result.
Example
Following Java program reads a colored image as greyscale, saves it, normalizes the brightness and increases the contrast of the given image and saves it.
import org.opencv.core.Core; import org.opencv.core.Mat; import org.opencv.highgui.HighGui; import org.opencv.imgcodecs.Imgcodecs; import org.opencv.imgproc.Imgproc; public class HstExample { public static void main(String args[]) { //Loading the OpenCV core library System.loadLibrary(Core.NATIVE_LIBRARY_NAME); String input = "D://images//sunset.jpg"; //Reading the Image from the file Mat source = Imgcodecs.imread(input, Imgcodecs.IMREAD_GRAYSCALE ); //Creating an empty matrix to store the result Mat dst = new Mat(source.rows(),source.cols(),source.type()); Imgcodecs.imwrite("D://images//Grey_scale.jpg", source); //Increasing the contrast Imgproc.equalizeHist(source, dst); //Writing the image Imgcodecs.imwrite("D://images//increasing_contrast.jpg", dst); HighGui.imshow("output image", dst); } }
Greyscale image
Resultant image
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