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Archive 2017 · How does Canon's 5 axis electronic image stabilization work?

takowasa
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p.1 #1 · p.1 #1 · How does Canon's 5 axis electronic image stabilization work?

And why does it only work for video? Thanks!

Jun 21, 2017 at 01:13 PM

AvianScott
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p.1 #2 · p.1 #2 · How does Canon's 5 axis electronic image stabilization work?

Video doesn't use the entire sensor the way still images do. It's my understanding that the electronic image stabilization uses some of the extra pixels around the video frame to compensate for shake by electronically shifting the video frame. That's my very basic understanding of it, take it with a grain of salt.

Jun 21, 2017 at 02:21 PM

artsf
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p.1 #3 · p.1 #3 · How does Canon's 5 axis electronic image stabilization work?

AvianScott wrote:
Video doesn't use the entire sensor the way still images do. It's my understanding that the electronic image stabilization uses some of the extra pixels around the video frame to compensate for shake by electronically shifting the video frame. That's my very basic understanding of it, take it with a grain of salt.

How is it different from applying stabilization in post?

Jun 21, 2017 at 06:28 PM

AJSJones
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p.1 #4 · p.1 #4 · How does Canon's 5 axis electronic image stabilization work?

Stabilization in post will lose some pixels aroud the edges and the retained/stabilized image from the centre is then expanded back to 1920x1080. Doing the same stabilization vector corrections during capture will result in the full 1920x1080 being captured but unscaled. Shooting with a bit of extra room around the image will allow you to get the final framing you want but at a small resolution price.

Jun 21, 2017 at 08:49 PM

takowasa
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p.1 #5 · p.1 #5 · How does Canon's 5 axis electronic image stabilization work?

AJSJones wrote:
Stabilization in post will lose some pixels aroud the edges and the retained/stabilized image from the centre is then expanded back to 1920x1080. Doing the same stabilization vector corrections during capture will result in the full 1920x1080 being captured but unscaled. Shooting with a bit of extra room around the image will allow you to get the final framing you want but at a small resolution price.

So the video is a 1920 x 1080 crop of the sensor? That sucks. Anyway, what makes it 5 axis stabilization? The method you describe would account for 2 dimensions of lateral translation and one dimension of rotation. What makes up the other two axes of stabilization?

Jun 21, 2017 at 09:48 PM

EB-1
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p.1 #6 · p.1 #6 · How does Canon's 5 axis electronic image stabilization work?

It employs the same principle as in the 5D IV, but the area is a bit larger due to the lower res.

EBH

Jun 21, 2017 at 10:01 PM

AJSJones
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p.1 #7 · p.1 #7 · How does Canon's 5 axis electronic image stabilization work?

takowasa wrote:
So the video is a 1920 x 1080 crop of the sensor? That sucks. Anyway, what makes it 5 axis stabilization? The method you describe would account for 2 dimensions of lateral translation and one dimension of rotation. What makes up the other two axes of stabilization?

Not necessarily a 1:1 1920 x1080 crop - whatever dimensions of sensor area are used, the image is downsampled somehow to yield the HD output dimensions. The image is falling a 2D sensor and different movements (in the different axes) affect where the image should fall and the sensors feed the info to modify the readout zone. Tilt (pitch) and yaw (swing) are rotations in the other two dimensions.

Jun 21, 2017 at 10:20 PM

JohnBrose
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p.1 #8 · p.1 #8 · How does Canon's 5 axis electronic image stabilization work?

It works well on the M5. I don't care for the crop in video,but its nice to have extra stabilization.

Jun 21, 2017 at 10:31 PM

takowasa
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p.1 #9 · p.1 #9 · How does Canon's 5 axis electronic image stabilization work?

AJSJones wrote:
Not necessarily a 1:1 1920 x1080 crop - whatever dimensions of sensor area are used, the image is downsampled somehow to yield the HD output dimensions. The image is falling a 2D sensor and different movements (in the different axes) affect where the image should fall and the sensors feed the info to modify the readout zone. Tilt (pitch) and yaw (swing) are rotations in the other two dimensions.

But how can pitch and yaw be accounted for without moving the sensor?

Jun 21, 2017 at 10:39 PM

AJSJones
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p.1 #10 · p.1 #10 · How does Canon's 5 axis electronic image stabilization work?

If the camera pitches forward, the desired image will now land on a different part of the sensor, right? So you read out a different area of the sensor. The change in sensor plane angle may have a slight effect on perspective distorion and/or DoF, but at least a stable image of the desired subject will be recorded

Jun 21, 2017 at 11:11 PM

takowasa
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p.1 #11 · p.1 #11 · How does Canon's 5 axis electronic image stabilization work?

AJSJones wrote:
If the camera pitches forward, the desired image will now land on a different part of the sensor, right? So you read out a different area of the sensor. The change in sensor plane angle may have a slight effect on perspective distorion and/or DoF, but at least a stable image of the desired subject will be recorded

Ah. So the image projected on the sensor is squashed vertically for pitch and horizontally for yaw, and software stretches it back out to compensate, where, as you note, perspective distortion and DOF will be adversely affected.

Got it -- thanks!

Jun 22, 2017 at 12:11 AM

AJSJones
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p.1 #12 · p.1 #12 · How does Canon's 5 axis electronic image stabilization work?

I don't think it's "squashed" or "stretched" (too processor intensive !) - it's just "moved" across the sensor - in many systems there are addtional pixels around the edge of the sensor to accommodate the system's ability to read out different parts in response to the movement of the image caused by camera movement in the 5 axes. The angular movment range this compensates for is pretty tiny so the perspective distortion is also tiny.

If camera shake tilts the camera a little forward, the centre of the desired image moves up in the lens's FoV so it moves down in the inverted image inside the camera -> the read-out area is moved down to keep the desired image centred in the read-out area. That principle applies to all 5 axes.

Jun 22, 2017 at 08:29 AM

takowasa
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p.1 #13 · p.1 #13 · How does Canon's 5 axis electronic image stabilization work?

AJSJones wrote:
I don't think it's "squashed" or "stretched" (too processor intensive !) - it's just "moved" across the sensor - in many systems there are addtional pixels around the edge of the sensor to accommodate the system's ability to read out different parts in response to the movement of the image caused by camera movement in the 5 axes. The angular movment range this compensates for is pretty tiny so the perspective distortion is also tiny.

If camera shake tilts the camera a little forward, the centre of the desired image moves up in the lens's FoV so it moves down...Show more →

Hmm -- I'll have to try that out. Let's say someone is standing holding a book and you take a photo with the focal point on the book. Now take another photo from the same position with the focal point on their shoes. Will the book be the same number of pixels tall in both photos?

Jun 22, 2017 at 01:58 PM

AJSJones
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p.1 #14 · p.1 #14 · How does Canon's 5 axis electronic image stabilization work?

That sounds like a huge change in angle of the camera - not what the sytsem was designed for. If it's a long telephoto shot where the person is only say 10% of the frame height, it's only a slight angular change, then the tilt of the sensor plane is therefore also only slight and the image is essentially only shifted on the plane of the sensor. The picture in this discussion shows how it works for one axis That is for optical, but you can recentre the ray from the subject by moving the sensor or moving the area that is read out.

Jun 22, 2017 at 02:19 PM

Pixel Perfect
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p.1 #15 · p.1 #15 · How does Canon's 5 axis electronic image stabilization work?

takowasa wrote:
So the video is a 1920 x 1080 crop of the sensor? That sucks. Anyway, what makes it 5 axis stabilization? The method you describe would account for 2 dimensions of lateral translation and one dimension of rotation. What makes up the other two axes of stabilization?

No, if that were the case you'd get a massive crop factor. 1080p video uses most of the sensor and does pixel binning and line skipping and scaling to produce video resolution. Alas this pixel binning outputs mush compared to cameras that do oversampling/subsampling like Sony. Only Pentax's 1080p video quality is worse than Canon's, and Canon's are closer to about 700p actual resolution.

Jun 22, 2017 at 08:05 PM


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