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I am making an android app, wherein there is a simple camera UI along with a filter list to manipulate pictures clicked by the camera. I am using the Processing library (https://processing.org/) in Java along with the Ketai library (http://ketai.org/) in the processing IDE.

Following is how my program primarily runs:

--- I have a camera object and an empty image object. The image object has the same resolution as that of the camera.

--- Reading from the camera also returns an image object. Lets call the image returned by the camera as cameraImage and the empty image as dummyImage.

--- At each frame, I read from the camera using the pixel array of the cameraImage, I copy each pixel individually to the dummyImage at the respective coordinate position.

--- It is at this point of copying from the cameraImage to the dummyImage that I manipulate the pixels according to the options selected by the user.

--- I take the red, green and blue values of each pixel while copying it using bit shifting (to gain maximum efficiency) and then manipulate it.

--- After copying to the dummyImage is done, I display the dummyImage to the screen as a normal Image.

Now the thing is the when I display the cameraImage directly, I am easily able to get around 50 to 60 fps. But when I display the dummyImage after copying, I get approximately 1.5 fps.

The following code demonstrates how I am copying from cameraImage to dummyImage. It doesn't have any filters but would take as much time as with any filters.