Jejd

import net.sourceforge.tess4j.ITessAPI; import net.sourceforge.tess4j.TessAPI1; import java.io.File; import java.nio.FloatBuffer; import java.nio.IntBuffer;

public class ImageOrientationDetector { public static void main(String[] args) { // Path to your local tessdata folder containing osd.traineddata String tessDataPath = "src/main/resources/tessdata"; File imageFile = new File("path/to/your/image.jpg");

    // 1. Create a handle for the low-level TessBaseAPI
    ITessAPI.TessBaseAPI handle = TessAPI1.TessBaseAPICreate();

    try {
        // 2. Initialize API with "osd" language for Orientation and Script Detection
        if (TessAPI1.TessBaseAPIInit3(handle, tessDataPath, "osd") != 0) {
            System.err.println("Could not initialize Tesseract API.");
            return;
        }

        // 3. Set Page Segmentation Mode (PSM) to AutoOsd (Value 0)
        TessAPI1.TessBaseAPISetPageSegMode(handle, ITessAPI.TessPageSegMode.PSM_AUTO_OSD);

        // 4. Read and set the target image file
        var pixImage = TessAPI1.pixRead(imageFile.getAbsolutePath());
        TessAPI1.TessBaseAPISetImage2(handle, pixImage);

        // 5. Trigger layout analysis 
        ITessAPI.TessPageIterator iterator = TessAPI1.TessBaseAPIAnalyseLayout(handle);

        if (iterator != null) {
            // Prepare native memory buffers to hold output orientation data
            IntBuffer orientation = IntBuffer.allocate(1);
            IntBuffer writingDirection = IntBuffer.allocate(1);
            IntBuffer textlineOrder = IntBuffer.allocate(1);
            FloatBuffer deskewAngle = FloatBuffer.allocate(1);

            // 6. Extract orientation info from the page layout iterator
            TessAPI1.TessPageIteratorOrientation(iterator, orientation, writingDirection, textlineOrder, deskewAngle);

            // Map integer values to human-readable angles
            int orientationValue = orientation.get(0);
            int degrees = convertToDegrees(orientationValue);

            System.out.println("--- Orientation Analysis Results ---");
            System.out.println("Tesseract Orientation ID: " + orientationValue);
            System.out.println("Calculated Orientation: " + degrees + "°");
            System.out.println("Deskew Angle Needed: " + deskewAngle.get(0) + "°");

            // Clean up native iterator allocation
            TessAPI1.TessPageIteratorDelete(iterator);
        } else {
            System.out.println("Could not parse image layout. Ensure the image has text characters.");
        }

    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        // 7. Clear native memory allocations safely
        TessAPI1.TessBaseAPIDelete(handle);
    }
}

/**
 * Maps Tesseract orientation constants to degrees.
 */
private static int convertToDegrees(int orientationValue) {
    return switch (orientationValue) {
        case 0 -> 0;    // UP (Normal)
        case 1 -> 90;   // RIGHT
        case 2 -> 180;  // DOWN
        case 3 -> 270;  // LEFT
        default -> -1;
    };
}

}