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Nikon D800E dark field images

November 1, 2014 JimK Leave a Comment

Here are the images from the preceding post. As usual in this read noise analysis series, they have been scaled into the range [0,1],  have had a gamma curve of 2.2 applied , been res’d down to 640×480, and JPEG’d.

First at ISO 100 with no filtering:

D900ESO100-1

Hot pixels dominate the normalization, driving the typical values of the image to virtually black.

Next, with our triplet of filters set to 25 pixels:

ISO 100 filtered by horizontal averaging filter with kernel 25 pixels
ISO 100 filtered by horizontal averaging filter with kernel 25 pixels
ISO 100 filtered by vertical averaging filter with kernel 25 pixels
ISO 100 filtered by vertical averaging filter with kernel 25 pixels
ISO 100 filtered by square averaging filter with kernel 25 pixels
ISO 100 filtered by square averaging filter with kernel 25 pixels

Just as predicted by the curves in the preceding post, the mid-frequency features are mostly horizontal.

With a set of bigger kernels:

 

ISO 100 filtered by horizontal averaging filter with kernel 306 pixels
ISO 100 filtered by horizontal averaging filter with kernel 306 pixels

 

ISO 100 filtered by vertical averaging filter with kernel 306 pixels
ISO 100 filtered by vertical averaging filter with kernel 306 pixels

 

ISO 100 filtered by square averaging filter with kernel 306  pixels
ISO 100 filtered by square averaging filter with kernel 306 pixels

 

At ISO 1600, unfiltered:

 

ISO 1600 unfiltered
ISO 1600 unfiltered

With the 25-pixel filters:

ISO 1600 filtered by horizontal averaging filter with kernel 25 pixels
ISO 1600 filtered by horizontal averaging filter with kernel 25 pixels
ISO 1600 filtered by vertical averaging filter with kernel 25 pixels
ISO 1600 filtered by vertical averaging filter with kernel 25 pixels
ISO 1600 filtered by square averaging filter with kernel 25 pixels
ISO 1600 filtered by square averaging filter with kernel 25 pixels

The mid-frequency horizontal components aren’t as strong at ISO 1600.

With a set of 306-pixel filters:

ISO 1600 filtered by horizontal averaging filter with kernel 306 pixels
ISO 1600 filtered by horizontal averaging filter with kernel 306 pixels
ISO 1600 filtered by vertical averaging filter with kernel 306 pixels
ISO 1600 filtered by vertical averaging filter with kernel 306 pixels
ISO 1600 filtered by square averaging filter with kernel 306 pixels
ISO 1600 filtered by square averaging filter with kernel 306 pixels

 

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