All About Symbian - Nokia (S60) and Sony Ericsson (UIQ) smartphones unwrapped

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Old 09-04-2012, 10:43 AM
bat400 bat400 is offline
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Defects in Nokia 808 PureView prototype images?

I am excited about the 808 PureView so I have been spending a lot of time looking at sample images on the Internet.

I have noticed some defects appearing regularly in the full-resolution (creative) images from the 808. Each time they appear as a bright square of nine pixels (3x3) which appear to be antialiased into the surrounding image. I will give you an example to show what I mean.

This is a link to a 4:3 image with defects from the Rio photoshoot:
http://press.nokia.com/wp-content/up...8-pureview.jpg
The EXIF information appears to confirm that this is an actual shot taken by the 808.

I have highlighted five of the defects in this scaled down copy of the image:
http://www1.picturepush.com/photo/a/...mg/7991654.jpg
The enlarged bits in the yellow circles are crops from the original 38MP image at full resolution.

This is a link to a 16:9 image from the Rio photoshoot where I can't find any defects:
http://press.nokia.com/wp-content/up...8-pureview.jpg
(that doesn't mean there aren't any defects, but I couldn't spot any)

I wondered whether these artefacts had appeared as a result of manipulation/uploading/compression when placing these images on the web, so I logged on to Nokia RDA and had one of the 808 prototypes take a 16:9 creative image. The phones must either have tape over the camera or they are in a box with the lens touching the back, but this means the image is mostly dark apart from the corner near the flash.

Here is the original image:
http://www4.picturepush.com/photo/a/...mg/7991737.jpg
(Warning: 20MB image!)

Here is another copy highlighting seven defects in what should be a plain image:
http://www5.picturepush.com/photo/a/...mg/7991803.jpg
(Warning: 20MB image!)

Note that I understand that noise can come from image compression, or from sensors when shot in low light, but these do not look like those kind of artefacts.

I would be interested to know if the imaging team are aware of these issues and whether they will be addressed in the final release versions of the 808.
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Old 09-04-2012, 04:36 PM
bat400 bat400 is offline
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Ok, so I gather that these are "hot pixels" which I hadn't heard of before. I would have thought that an algorithm to identify and patch them would be relatively straightforward...
 

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