Mixing
Calculating the stability of frame rate given a frequency histogram of contiguous missed refresh periods
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First off, I'm looking at the output of video to a screen, and I've captured the timing for when each frame is drawn to the screen. What I'm trying to capture is the stability of this frame rate for quality checking purposes (if frames aren't drawn steadily, it can cause jerky animation, which is a bad viewing experience). The device has a set interval called refresh periods, in which it updates the screen every 16.666667ms.
So I have a frequency histogram where the class intervals are the number of contiguous missed refresh periods (the time spent between frames being drawn), and I've found what I believe is a way to calculate out the stability of the second by doing the following:
Divide the range of populated class intervals by the total number of observations, and then take the inverse of the percentage.
For example:
Given a device with the maximum ability to draw 60 frames in a 1000ms period;
If the device was to draw 30 frames in the 1000ms period;
I could receive a frequency histogram with all 30 frames drawn every 32ms (effectively putting all 30 observations in the bucket of 1 missed refresh periods), which gives me a "score/percent" of 97. This is the best case example for a 30fps video, where every other refresh period is skipped, resulting in a smooth experience.
Given the same device, with 60 frames drawn in the 1000ms period;
I would receive a frequency histogram with all 60 frames drawn every 16ms (effectively putting all 60 observations in the bucket of 0 missed refresh periods), which gives me a "score/percent" of 100. This is the best case example for a 60fps video, where every refresh period the screen is updated, resulting in a smooth experience.
And finally:
Given the same device, with 30 frames drawn in the 1000ms period;
I could receive a frequency histogram with 29 frames drawn at 16ms, and then the following frame could take the remainder of the second (500ms), resulting in a frequency histogram of 29 observations in the 0 bucket, and 1 in the 29 missed refresh periods, giving me a score of 3. This is the worst case example for a 30fps video, where every refresh period the screen is updated, until halfway through the second where it just... stops; resulting in a very bad experience.
What I'm looking to find is what such a calculation would be called, if it even has a term; as I'm aware that this is a very, very niche situation. Any help would be appreciated.
terminology
asked Jan 10 at 22:39
XarusXarus
1013
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add a comment |
$begingroup$
First off, I'm looking at the output of video to a screen, and I've captured the timing for when each frame is drawn to the screen. What I'm trying to capture is the stability of this frame rate for quality checking purposes (if frames aren't drawn steadily, it can cause jerky animation, which is a bad viewing experience). The device has a set interval called refresh periods, in which it updates the screen every 16.666667ms.
So I have a frequency histogram where the class intervals are the number of contiguous missed refresh periods (the time spent between frames being drawn), and I've found what I believe is a way to calculate out the stability of the second by doing the following:
Divide the range of populated class intervals by the total number of observations, and then take the inverse of the percentage.
For example:
Given a device with the maximum ability to draw 60 frames in a 1000ms period;
If the device was to draw 30 frames in the 1000ms period;
I could receive a frequency histogram with all 30 frames drawn every 32ms (effectively putting all 30 observations in the bucket of 1 missed refresh periods), which gives me a "score/percent" of 97. This is the best case example for a 30fps video, where every other refresh period is skipped, resulting in a smooth experience.
Given the same device, with 60 frames drawn in the 1000ms period;
I would receive a frequency histogram with all 60 frames drawn every 16ms (effectively putting all 60 observations in the bucket of 0 missed refresh periods), which gives me a "score/percent" of 100. This is the best case example for a 60fps video, where every refresh period the screen is updated, resulting in a smooth experience.
And finally:
Given the same device, with 30 frames drawn in the 1000ms period;
I could receive a frequency histogram with 29 frames drawn at 16ms, and then the following frame could take the remainder of the second (500ms), resulting in a frequency histogram of 29 observations in the 0 bucket, and 1 in the 29 missed refresh periods, giving me a score of 3. This is the worst case example for a 30fps video, where every refresh period the screen is updated, until halfway through the second where it just... stops; resulting in a very bad experience.
What I'm looking to find is what such a calculation would be called, if it even has a term; as I'm aware that this is a very, very niche situation. Any help would be appreciated.
terminology
asked Jan 10 at 22:39
XarusXarus
1013
$endgroup$
add a comment |
$begingroup$
First off, I'm looking at the output of video to a screen, and I've captured the timing for when each frame is drawn to the screen. What I'm trying to capture is the stability of this frame rate for quality checking purposes (if frames aren't drawn steadily, it can cause jerky animation, which is a bad viewing experience). The device has a set interval called refresh periods, in which it updates the screen every 16.666667ms.
So I have a frequency histogram where the class intervals are the number of contiguous missed refresh periods (the time spent between frames being drawn), and I've found what I believe is a way to calculate out the stability of the second by doing the following:
Divide the range of populated class intervals by the total number of observations, and then take the inverse of the percentage.
For example:
Given a device with the maximum ability to draw 60 frames in a 1000ms period;
If the device was to draw 30 frames in the 1000ms period;
I could receive a frequency histogram with all 30 frames drawn every 32ms (effectively putting all 30 observations in the bucket of 1 missed refresh periods), which gives me a "score/percent" of 97. This is the best case example for a 30fps video, where every other refresh period is skipped, resulting in a smooth experience.
Given the same device, with 60 frames drawn in the 1000ms period;
I would receive a frequency histogram with all 60 frames drawn every 16ms (effectively putting all 60 observations in the bucket of 0 missed refresh periods), which gives me a "score/percent" of 100. This is the best case example for a 60fps video, where every refresh period the screen is updated, resulting in a smooth experience.
And finally:
Given the same device, with 30 frames drawn in the 1000ms period;
I could receive a frequency histogram with 29 frames drawn at 16ms, and then the following frame could take the remainder of the second (500ms), resulting in a frequency histogram of 29 observations in the 0 bucket, and 1 in the 29 missed refresh periods, giving me a score of 3. This is the worst case example for a 30fps video, where every refresh period the screen is updated, until halfway through the second where it just... stops; resulting in a very bad experience.
What I'm looking to find is what such a calculation would be called, if it even has a term; as I'm aware that this is a very, very niche situation. Any help would be appreciated.
terminology
asked Jan 10 at 22:39
XarusXarus
1013
$endgroup$
First off, I'm looking at the output of video to a screen, and I've captured the timing for when each frame is drawn to the screen. What I'm trying to capture is the stability of this frame rate for quality checking purposes (if frames aren't drawn steadily, it can cause jerky animation, which is a bad viewing experience). The device has a set interval called refresh periods, in which it updates the screen every 16.666667ms.
So I have a frequency histogram where the class intervals are the number of contiguous missed refresh periods (the time spent between frames being drawn), and I've found what I believe is a way to calculate out the stability of the second by doing the following:
Divide the range of populated class intervals by the total number of observations, and then take the inverse of the percentage.
For example:
Given a device with the maximum ability to draw 60 frames in a 1000ms period;
If the device was to draw 30 frames in the 1000ms period;
I could receive a frequency histogram with all 30 frames drawn every 32ms (effectively putting all 30 observations in the bucket of 1 missed refresh periods), which gives me a "score/percent" of 97. This is the best case example for a 30fps video, where every other refresh period is skipped, resulting in a smooth experience.
Given the same device, with 60 frames drawn in the 1000ms period;
I would receive a frequency histogram with all 60 frames drawn every 16ms (effectively putting all 60 observations in the bucket of 0 missed refresh periods), which gives me a "score/percent" of 100. This is the best case example for a 60fps video, where every refresh period the screen is updated, resulting in a smooth experience.
And finally:
Given the same device, with 30 frames drawn in the 1000ms period;
I could receive a frequency histogram with 29 frames drawn at 16ms, and then the following frame could take the remainder of the second (500ms), resulting in a frequency histogram of 29 observations in the 0 bucket, and 1 in the 29 missed refresh periods, giving me a score of 3. This is the worst case example for a 30fps video, where every refresh period the screen is updated, until halfway through the second where it just... stops; resulting in a very bad experience.
What I'm looking to find is what such a calculation would be called, if it even has a term; as I'm aware that this is a very, very niche situation. Any help would be appreciated.
terminology
terminology
asked Jan 10 at 22:39
XarusXarus
1013
asked Jan 10 at 22:39
XarusXarus
1013
edited Jan 10 at 23:52
Xarus
asked Jan 10 at 22:39
XarusXarus
1013
asked Jan 10 at 22:39
XarusXarus
1013
asked Jan 10 at 22:39
XarusXarus
1013
1013
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