Definition
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The intrinsic scale is determined by the highest resolution at which
the image quality is excellent, and no annoying defects are visible. |
Scale affects defect visibility
Wrong focus, graininess, processing artefacts can detract from the appeal of an image. Viewing an image at a smaller size or scale factor, can make degradations less visible and annoying, improving the image's perceived quality. |
Examples of quality defects
Finding the intrinsic scale
In the following examples, each line shows crops taken from the same source image. Each crop is extracted after previously downscaling the source image by a different amount. You can often notice strong degradations at the original size (left-most), whereas the lowest resolution is of excellent quality (right-most image). The INTRINSIC scale is often somewhere in between.
Note: it is best to view each image as is, do not click to enlarge. |
At the intrinsic scale:
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Participating in the experiment
You will annotate images using a browser-based interface, called Zovi. This allows browsing a collection of images, zooming to select the intrinsic scale for each, and saving the selection.
Zovi UI controlsZoom: use the zoom slider at the top of the screen
Pan: click and drag the image Next image: press the green arrow buttons or the right arrow key. |
Steps to complete the work
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2. Select the intrinsic scale
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I takes about 15 seconds to find the intrinsic scale (zoom) for each image. Thank you for participating in our study!