Using The Frame Averaging Mode in EvenLonger
Mar 23, 2022 06:53:51 #
This is my first attempt at using the Frame Averaging mode in the EvenLonger IPhone app. EvenLonger is a very sophisticated app that will allow you to do long exposures. There was a storm brewing in the gulf yesterday and the waves and clouds were very active. Shooting from the 6th floor balcony, it was extremely windy. The IPhone 13 Pro Max was mounted on a tripod. The first image below is the result of 401 frames for 30 secs. The second image is a normal shot taken with the native phone camera. The last image is fa screen shot of what the app looks like in the Apple Store.
Mar 23, 2022 08:05:15 #
Mar 24, 2022 13:21:51 #
Mar 27, 2022 13:15:59 #
Roger2011
Loc: Central Illinois
Hmmm. It is claimed that frame averaging in this app reduces image noise in those areas that remain stationary. But what if something jiggles the camera ever so slightly during the exposure, leading to slight frame shift in the successive images? Will the algorithm realign the acquired successive images with the composite image to minimize blur in the stationary areas? That may be a secret, but I'm going to look into it.
Mar 27, 2022 13:26:38 #
Roger2011 wrote:
Hmmm. It is claimed that frame averaging in this app reduces image noise in those areas that remain stationary. But what if something jiggles the camera ever so slightly during the exposure, leading to slight frame shift in the successive images? Will the algorithm realign the acquired successive images with the composite image to minimize blur in the stationary areas? That may be a secret, but I'm going to look into it.
Mario Tomiak is the creator of this app. You can ask this question on his Facebook page. He will answer you.
Mar 27, 2022 15:52:42 #
Roger2011
Loc: Central Illinois
Fstop12 wrote:
Mario Tomiak is the creator of this app.
I listened to an interview between David Addison and Mario Tomiak. In that interview Tomiak indicated that each raw rgb pixel took two operations to perform the averaging step. This tells me there can be no image transformation performed before averaging it in.
Suppose n images have been averaged together and the (n+1)st image is to be averaged in. Set S1 = n/(n+1) and S2 = 1/(n+1). Let A[n] represent the average of n images, A[n+1] the average of n+1 images, and I[n+1] the (n+1)st image. Then A[n+1] = S1*A[n] + S2*I[n+1], which shows the apparent two operations mentioned by Tomiak. I'm always leary of snake-oil salesmen who won't reveal the secret ingredients in their miracle elixir. I don't think the app is worth to me what Tomiak is charging for it. Maybe for others it is.
Mar 27, 2022 16:28:22 #
Roger2011 wrote:
I listened to an interview between David Addison a... (show quote)
Your engineering education is showing. Too much math for me. LOL.
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