Camera preview quality in Android is poor

Question

I am making a Camera app in Android and have used the following function to get the preview size:

private Size getOptimalPreviewSize(List sizes,          


        

Answer 1

That algorithm is not the greatest.

The default algorithm in my CWAC-Camera library is now:

  public static Camera.Size getBestAspectPreviewSize(int displayOrientation,
                                                     int width,
                                                     int height,
                                                     Camera.Parameters parameters,
                                                     double closeEnough) {
    double targetRatio=(double)width / height;
    Camera.Size optimalSize=null;
    double minDiff=Double.MAX_VALUE;

    if (displayOrientation == 90 || displayOrientation == 270) {
      targetRatio=(double)height / width;
    }

    List<Size> sizes=parameters.getSupportedPreviewSizes();

    Collections.sort(sizes,
                     Collections.reverseOrder(new SizeComparator()));

    for (Size size : sizes) {
      double ratio=(double)size.width / size.height;

      if (Math.abs(ratio - targetRatio) < minDiff) {
        optimalSize=size;
        minDiff=Math.abs(ratio - targetRatio);
      }

      if (minDiff < closeEnough) {
        break;
      }
    }

    return(optimalSize);
  }

This:

• Takes into account portrait versus landscape

• Starts with the highest resolution previews and works its way down

• Can be tailored via closeEnough to opt for higher resolution as opposed to best matching the aspect ratio of the preview area