Debayering

Detailed documentation of the ALS Debayer process

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?}}

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

DEBAYER[Debayering]
UNCHANGED[Return unchanged image]

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 --> DEBAYER
READ_PREF --> DEBAYER

TEST_NEEDED -- NO --> UNCHANGED

DEBAYER --> RETURN

UNCHANGED --> END
RETURN --> END


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class TEST_AUTO,TEST_NEEDED test
class START,END bounds
class RETURN,UNCHANGED,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

The modified image is sent back to the Preprocess module.