Difference between revisions of "JP4 HDR"

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== JP4 HDR ==
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== HDR JP4 ==
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Bayer pattern look like this
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{| class="wikitable"
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|-
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| bgcolor="red"|R
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| bgcolor="green"|G1
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| bgcolor="red"|R
 +
| bgcolor="green"|G1
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| bgcolor="red"|R
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| bgcolor="green"|G1
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|-
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| bgcolor="green"|G2
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| bgcolor="blue"|B
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| bgcolor="green"|G2
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| bgcolor="blue"|B
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| bgcolor="green"|G2
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| bgcolor="blue"|B
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|-
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| bgcolor="red"|R
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| bgcolor="green"|G1
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| bgcolor="red"|R
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| bgcolor="green"|G1
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| bgcolor="red"|R
 +
| bgcolor="green"|G1
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|-
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| bgcolor="green"|G2
 +
| bgcolor="blue"|B
 +
| bgcolor="green"|G2
 +
| bgcolor="blue"|B
 +
| bgcolor="green"|G2
 +
| bgcolor="blue"|B
 +
|-
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| bgcolor="red"|R
 +
| bgcolor="green"|G1
 +
| bgcolor="red"|R
 +
| bgcolor="green"|G1
 +
| bgcolor="red"|R
 +
| bgcolor="green"|G1
 +
|-
 +
| bgcolor="green"|G2
 +
| bgcolor="blue"|B
 +
| bgcolor="green"|G2
 +
| bgcolor="blue"|B
 +
| bgcolor="green"|G2
 +
| bgcolor="blue"|B
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|}
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Some sensors have possibility to set independed scale to G1 and G2.
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Considering that the accessible optics does not give the full permission of a sensor resolution, it can be used for increase in a dynamic range of a image sensor.
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{| border="0" cellpadding="2"
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|-
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| [[Image:Hdr02 all gain1.jpeg|thumb|150px nonHDR image with global analog gain=1]] || [[Image:Hdr02 all gain16.jpeg|thumb|150px nonHDR image with global analog gain=16]] || [[Image:Hdr02.jpeg|thumb|150px HDR source image with gained G2]] || [[Image:Hdr02 processed.jpg|thumb|150px processed HDR image]]
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|-
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|}
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Matlab have interesting [http://www.mathworks.com/access/helpdesk/help/toolbox/images/makehdr.html possibility] for creating HDR from series of LDR images.
 +
 
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We can easy make script for online & one click make HDR from series of images with different exposure times.
 +
 
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=== Reference: ===
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* [http://pfstools.sourceforge.net/index.html pfsTools]
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* [http://scanline.ca/exrtools exrTools]
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* [http://cvtool.sourceforge.net/index.html cvTool: GPU accelerated tools]
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* Tone Mapping [http://www.mpi-inf.mpg.de/resources/tmo algos]. With image/video samples.
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* [http://www.mpi-inf.mpg.de/resources/tmo/NewExperiment/TmoOverview.html Gallery of Reference Tone Mapped Images]
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----
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* [http://www.stuckincustoms.com/ nice HDR blog]

Latest revision as of 11:34, 3 May 2009

HDR JP4

Bayer pattern look like this

R G1 R G1 R G1
G2 B G2 B G2 B
R G1 R G1 R G1
G2 B G2 B G2 B
R G1 R G1 R G1
G2 B G2 B G2 B

Some sensors have possibility to set independed scale to G1 and G2. Considering that the accessible optics does not give the full permission of a sensor resolution, it can be used for increase in a dynamic range of a image sensor.

150px nonHDR image with global analog gain=1
150px nonHDR image with global analog gain=16
150px HDR source image with gained G2
150px processed HDR image

Matlab have interesting possibility for creating HDR from series of LDR images.

We can easy make script for online & one click make HDR from series of images with different exposure times.

Reference: