iPhone XS Let's talk 4K EIS+OIS on the iPhone XS & XR

[JotaMR]

Hi,
I am reading this thread: https://forums.macrumors.com/threads/lets-talk-4k-60fps-on-the-iphone-8-plus.2073286/

Finally, Apple confirmed for iPhone 8 Plus & X: "iPhone lacks EIS for any 4K mode. EIS is only used when shooting 1080P and 720P. For those rates, the iPhone uses EIS and OIS. For 4K at any frame rate, ONLY OIS is used."

It continues being the same on XS & XR? Nothing has changed?

Now, could be possible iPhone XS & XR uses EIS + OIS for 4K30?

 

[jschnee21]

"It continues being the same on XS & XR? Nothing has changed?"
"Now, could be possible iPhone XS & XR uses EIS + OIS for 4K30?"

While I cannot tell you definitively the x and y pixel dimensions of the CMOS sensor in the new XS cameras. Recall how OIS and EIS work.

For OIS, mechanical vibration dampening is used limit shake. So this capability is available regardless of the resolution of the image/video being captured.

For EIS, the way this works is that the pixel dimensions of the sensor must be larger than the dimensions of the image / video stream being captured. That is to say, the full frame size of the sensor is always being captured and software is used to track image/scene alignment fiducials to selectively crop each frame down to the exported resolution (e.g. 720, 1080, etc.)

In the case of 4K output, there are at least two reasons why EIS cannot or has not been used historically:

1) Size of sensor is same / too close to size of export -- e.g. insufficient extra pixel perimeter for meaningful EIS.

2) Insufficient real time video processing computational horsepower was available to dynamically align and crop each frame to provide the EIS effect at these higher and more bandwidth intensive resolutions.

 

[Caspavio]

to illustrate on jschnee21's point on insufficient extra pixel perimeter for meaningful EIS. the diagram on the left simulates your shakes. therefore, to eliminate shakes you only use the centre portion where there are no overlaps. the yellow box is the original camera resolution and the blue box is the resolution of the area with no overlaps. therefore you cannot do EIS for 4k