CODEWITHSUNDEEP
androidandroid-camera2
Aaron Allen
Aaron Allen

Reputation: 165

Camera2 API - jpeg capture file size too big

I'm using Camera2 api to do a still image capture and save it to a jpeg file. The problem is that the size of the file is always >900kb, even if I set the image dimensions to the smallest available and put jpeg quality low.

This is how I'm saving the file in the ImageAvailableListener. It's a xamarin project so code is in c#.

image = reader.AcquireLatestImage();
ByteBuffer buffer = image.GetPlanes()[0].Buffer;
byte[] bytes = new byte[buffer.Remaining()];
buffer.Get(bytes);
output = new FileOutputStream(File);
output.Write(bytes);
output.Close();

The file should be ~20kb, so why can't I get file sizes lower than 900kb?

Upvotes: 2

Views: 1900

Answers (2)

Naveen Kumar M
Naveen Kumar M

Reputation: 7557

You can also reduce the capture image quality 

mPreviewRequestBuilder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
            mPreviewRequestBuilder.set(CaptureRequest.JPEG_THUMBNAIL_QUALITY, (byte) 70); // add this line and set your own quality

Upvotes: 2

Aaron Allen
Aaron Allen

Reputation: 165

I figured it out. Needed to create a bitmap to apply compression:

image = reader.AcquireLatestImage();
ByteBuffer buffer = image.GetPlanes()[0].Buffer;
byte[] bytes = new byte[buffer.Remaining()];
buffer.Get(bytes);

// need to get the bitmap in order to compress
Bitmap bitmap = BitmapFactory.DecodeByteArray(bytes, 0, bytes.Length);

using (System.IO.MemoryStream stream = new System.IO.MemoryStream())
{
    bitmap.Compress(Bitmap.CompressFormat.Jpeg, 85, stream);

    Save(stream.GetBuffer());
}

Upvotes: 1

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