[mushroomng]

808 has oversampling camera... Deos that mean that the real sensor is just 8 megapixel?... But after capturing image... It digitally add pixel into it?

[Jampe · Accepted solution]

Hi mushroomng,

Please have a look at this article in Nokia Press providing everything you want to know about Pureview technology. 

Hope this answers your question!

Jampe

[mushroomng]

thx.... By the way... how you type the word ' this article' with a link hidden behind that word?

[farby]

First Paste the link..then select the whole link and replace it with the word you want to ...

[Jampe]

@ mushroomng,

Type the word you want to use as a hyperlink, then higlight the word and select insert/edit link (the chain icon). When the pop-up menu opens, paste or type in the link you want to use. Usually users want to stay on the forum page and the link to open in a new window, so you can choose Open in new window (_blank). 

Jampe

[Manu_T]

at mushroomng

The correct term is NOT oversampling but DOWNSAMPLING.

The 808 captures at 41MPixels and scales down (using advanced anti-aliasing techniques) to a 5 or 8MPixels image. Hence removing sensor noise and artifacts.

Quite the difference. 

[rayhipkiss]

---

Manu_T wrote:

at mushroomng

The correct term is NOT oversampling but DOWNSAMPLING.

The 808 captures at 41MPixels and scales down (using advanced anti-aliasing techniques) to a 5 or 8MPixels image. Hence removing sensor noise and artifacts.

Quite the difference. 

---

Did you read the White paper posted by Jampe? The article clearly states the 808 uses OVERSAMPLING which combines many pixels into one pixel to give a pure pixel.

Ray. 

[perus]

Must be a typo. From 41Mp to 8 or 5 is nothing else than downsampling. Marketing sometimes get it wrong. Oversampling is what most cheap webcams use to sell more pixels.

/Per

[mushroomng]

so.... Can i choose not to downsample it and make it remain 38mp for all images?

[rayhipkiss]

---

perus wrote:
Must be a typo. From 41Mp to 8 or 5 is nothing else than downsampling. Marketing sometimes get it wrong. Oversampling is what most cheap webcams use to sell more pixels.

/Per

---

The term oversampling is being widely used around the internet when the 808 is being discussed, so I don't think it is a typo. Oversampling is a term in digital photography to describe taking a certain number of pixels and combining them into one pixel. With the 808 seven pixels are combined to create one "pure" pixel.

http://conversations.nokia.com/2012/02/27/nokia-808-pureview-–-revolutionary-camera-technology-great-smartphone/

Ray. 

[rayhipkiss]

---

mushroomng wrote:
so.... Can i choose not to downsample it and make it remain 38mp for all images?

---

Yes, the 808 features a "creative shooting mode" to take shots in 38 MP mode which you can later crop or resize.

http://conversations.nokia.com/2012/02/27/nokia-808-pureview-–-revolutionary-camera-technology-great-smartphone/

Ray. 

[Manu_T]

---

rayhipkiss wrote:

---

Manu_T wrote:

at mushroomng

The correct term is NOT oversampling but DOWNSAMPLING.

The 808 captures at 41MPixels and scales down (using advanced anti-aliasing techniques) to a 5 or 8MPixels image. Hence removing sensor noise and artifacts.

Quite the difference. 

---

Did you read the White paper posted by Jampe? The article clearly states the 808 uses OVERSAMPLING which combines many pixels into one pixel to give a pure pixel.

Ray. 

---

I don't read documents that are plain wrong! Or use the wrong terminology as it undermines the credibility of the poster/writer.

The term "oversampling" is used in signal audio processing NOT in photography.

In Image processing the correct term IS Downscaling (AKA Downsampling). E.g. scaling a 1600x1200 pixel image down to 800x600pixels (in this example case combining 2 pixels into 1 pixel). The opposite is UPSCALING (AKA upsampling), thus making a smaller image larger (AKA pixel doubling). This is what an iPad does when it 'upscales' iPhone-apps to its larger screen.

Pureview takes an 38MPixel image and SCALES it DOWN to 8Mpixels or 5Mpixels.

Regards.

[rayhipkiss]

@ Manu_T

 I think your missing the point of the term "oversampling" entirely. The authors of that Whitepaper have used the term to describe the method or technique the 808 uses to create its "pure" pixels. Each pure pixel is created by combining up to 7 pixels into one pure pixel. So, each pure pixel is an oversampled pixel.

 If you still insist that the authors are wrong to use that term, then you should take it up with them and not us.

All the best.

Ray. 

[93tid]

Upsampling is not the same as oversampling. Oversampling in audio signal processing means sampling a signal with a higher frequency, main reason being in order to achieve cheaper higher-resolution A/D and D/Aconversion. Basicially this means taking more samples of the sound being recorded in order to be able to reproduce it better, reduce noise, etc., etc. even when downsampled, mainly to reduce the file size and bit rate. This is more or less what Pureview does - it uses 7 pixels to capture an image instead of 1, i.e. it uses "overpixelling" if you wish, by shooting at 41MP in order to achieve better quality say 5MP pictures compared to 5MP photos shot at 5MP.

[Kolondrum]

Hello! It is difficult in English, sorry.
The 3-week pureview appliances "HOT PIXEL" sick. What is the position of the defect nokia? Roof over the migratory defect, roof blue pixel error >> example: http://www.kephost.com/images4/2012/12/10/a1_2012_12_10_4s832566jj.jpg..