Debayering

Detailed documentation of the ALS Debayer process
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Overview

The Debayer process is used on color images in FITS or Raw format.

It generates a color image from the raw image and the description of the Bayer pattern installed on the sensor that generated the image.

Its configuration is managed via ALS preferences page.

Configuration

Source Data Type Required Default Value
Bayer pattern Preferences: Processing Tab choice:
- AUTO
- GRBG
- RGGB
- GBRG
- BGGR		 YES AUTO

Control

This process is triggered by the Preprocess module.

Input

Data Type
image received from the Preprocess module Image

Behavior

graph LR

START([START])

TEST_AUTO{{Preferences = AUTO?}}
TEST_NEEDED{{Debayering needed?}}
TEST_DATA_TYPE{{8-bit or 16-bit<br>unsigned integer data?}}

READ_META[Pattern = Read metadata]
READ_PREF[Pattern = Read preferences]

DEBAYER[Debayering]
UNCHANGED[Return unchanged image]
IGNORED[Skip sub]

RETURN[Return modified image]

END([END])

START --> TEST_AUTO

TEST_AUTO -- YES --> TEST_NEEDED
TEST_NEEDED -- YES --> READ_META
TEST_AUTO -- NO --> READ_PREF

READ_META --> TEST_DATA_TYPE
READ_PREF --> TEST_DATA_TYPE

TEST_DATA_TYPE -- YES --> DEBAYER
TEST_DATA_TYPE -- NO --> IGNORED

TEST_NEEDED -- NO --> UNCHANGED

DEBAYER --> RETURN

UNCHANGED --> END
IGNORED --> END
RETURN --> END


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class TEST_AUTO,TEST_NEEDED,TEST_DATA_TYPE test
class START,END bounds
class RETURN,UNCHANGED,IGNORED,DEBAYER,READ_META,READ_PREF step

The raw image is converted to a color image using the configured Bayer pattern.

  • if configured pattern is set to AUTO, the pattern is taken from the image metadata.

Output

  • Subs successfully debayered are sent back to the Preprocess module as modified color images.
  • When the Bayer pattern preference is set to AUTO, mono subs and already-debayered color subs are sent back unchanged.
  • Subs that cannot be debayered are skipped and produce no output.
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