Java Program to Add Text to an image in OpenCV
OpenCV is the cross-platform open-source library for computer vision, image processing, and machine learning. It plays a major role nowadays in real-time operations in improving modules provides adequate functions for image manipulation. It has C++, C, Python, and Java interfaces and supports Windows, Linux, macOS, iOS, and Android. By using it, one can even process images and videos to identify objects, faces, or even handwriting of a human
Here, putText() which is an inbuilt method will be used after importing this method from its respective module given below in the java program.
Syntax: to import module to deal with images:
import org.opencv.imgproc.Imgproc;
Syntax: to use putText() method of this class is as follows:
putText(image, text, org, fontType, fontSize, color, thickness)
Parameters:
Datatype of parameters | Name of parameter | Functionalities |
---|---|---|
Mat object | image | Text to be added to an input image object |
String | text | Text to be inserted to an input image |
Point (tuple) | org | Coordinates of the bottom left corner of a text string in the image |
Integer | fontType | Depicting the style of fonts |
Double | fontSize | Size of text to be added over an input image |
Scalar | color | Color of the text string to be drawn over an input image |
Integer | thickness | The thickness of the line in the unit, by default it is unity |
Exception: No exception is thrown by this method of this class because simply the tuple is passed. For example in BGR color spectrum, the blue light tuple is as follows: (255,0,0)
Implementation: Input image is as follows been randomly taken. Now text- “GFG IS COOL” is to be added over this image.
Java
// Importing all OpenCV files import org.opencv.*; import org.opencv.imgproc.Imgproc; public class GFG { // Main driver code public static void main(String args[]) throws Exception { // Loading the OpenCV core library System.loadLibrary(Core.NATIVE_LIBRARY_NAME); // Reading the contents of the image // from local computer directory String src = "D:\\InputImage.jpg" ; // Creating a Mat object Mat image = Imgcodecs.imread(src); // Text to be added String text = "GFG IS COOL" ; // Points from where text should be added Point org = new Point( 170 , 280 ); // Color of the text Scalar color = new Scalar( 0 , 0 , 255 ); // Fonttype of the text to be added int fontType = Imgproc.FONT_HERSHEY_PLAIN; // Fontsize of the text to be added int fontSze = 1 ; // Thickness of the lines in px int thickness = 3 ; // Adding text to the image using putText method Imgproc.putText(image, text, org, fontType, fontSize, color, thickness); // Displaying the Image after adding the Text HighGui.imshow( "" , image); // Waiting for a key event to delay HighGui.waitKey(); } } |
Output: The image after adding text is as follows:
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