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ARCore provides the HDR Cube map of the scene through the following API calls:

// Get the current frame.
Frame frame = session.update();

// Get the light estimate for the current frame.
LightEstimate lightEstimate = frame.getLightEstimate();

// Get HDR environmental lighting as a cubemap in linear color space.
Image[] lightmaps = lightEstimate.getEnvironmentalHdrCubeMap();

I want to save these lightmaps to internal or external memory. How can I achieve this?

OhhhThatVarun
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VkTmz
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1 Answers1

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I found the solution!

Add the below code after getting the lightmaps from above. This converts the android.media.Image type to a bitmap and then saves it to memory.

for (int i = 0; i < lightmaps.length; i++)
{
    Image lightmapimage = lightmaps[i];

    int width = lightmapimage.getWidth();
    int height = lightmapimage.getHeight();
    Image.Plane[] planes = lightmapimage.getPlanes();

    int pixelStride = planes[0].getPixelStride();
    int rowStride = planes[0].getRowStride();
    int rowPadding = rowStride - pixelStride * width;
    ByteBuffer buffer = planes[0].getBuffer();
    Bitmap bitmap = Bitmap.createBitmap(width + rowPadding / pixelStride, height, Bitmap.Config.ARGB_8888);
    bitmap.copyPixelsFromBuffer(buffer);


    lightmapimage.close();
    saveBitmap(bitmap);
}

Below is the saveBitmap function [Source]. This saves the bitmap as a png to /storage/emulate/0/DCIM. Change this if you want to.

public static void saveBitmap(Bitmap bm)
{
    String path = "";
    File parent = new File(TextUtils.isEmpty(path) ? Environment.getExternalStorageDirectory() + "/" + Environment
            .DIRECTORY_DCIM : path);
    if (!parent.exists()) {
        parent.mkdirs();
    }
    File f = new File(parent.getAbsolutePath() + File.separator + "arcore_bitmap" + new Date().getTime() + ".jpg");
    if (f.exists()) {
        f.delete();
    }
    FileOutputStream out = null;
    try {
        out = new FileOutputStream(f);
        bm.compress(Bitmap.CompressFormat.PNG, 90, out);
        Log.i("savingbitmap","savingbitmap" + parent.getAbsolutePath());
        out.flush();
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        if (out != null) {
            try {
                out.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}
VkTmz
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