Multiple reference star differential imaging with VLT/SPHERE - Influence of the reference frame selection and library

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Volume 691 (November 2024)

A&A, 691 (2024) A267

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Table 3

Summary of best S/N results for each of the different image comparison and selection methods: full-frame and with the optimized zone.

Method	Full frame	Optimized zone
cADI	2.2	2.2
ADI-PCA	7.3	8.0
single RSDI	7.2	6.8

R > 1, N > 1

CNN	${7.1}_{- 0.4}^{+ 1.2}$ ${7.1_{ - 0.4}^{ + 1.2}}$	${6.4}_{- 0.1}^{+ 0.2}$ ${6.4_{ - 0.1}^{ + 0.2}}$
PCC	${8.0}_{- 0.2}^{+ 0.1}$ ${8.0_{ - 0.2}^{ + 0.1}}$	${8.4}_{- 0.4}^{+ 0.7}$ ${8.4_{ - 0.4}^{ + 0.7}}$
SSIM	${6.5}_{- 0.3}^{+ 0.4}$ ${6.5_{ - 0.3}^{ + 0.4}}$	${8.0}_{- 0.6}^{+ 0.6}$ ${8.0_{ - 0.6}^{ + 0.6}}$
Strehl	${6.2}_{- 0.4}^{+ 0.6}$ ${6.2_{ - 0.4}^{ + 0.6}}$	${6.1}_{- 0.3}^{+ 0.2}$ ${6.1_{ - 0.3}^{ + 0.2}}$
RC	${5.4}_{- 0.3}^{+ 0.5}$ ${5.4_{ - 0.3}^{ + 0.5}}$	${5.3}_{- 0.3}^{+ 1.2}$ ${5.3_{ - 0.3}^{ + 1.2}}$

R = 1, N = 1

	${6.9}_{- 1.7}^{+ 0.7}$ $6.9_{ - 1.7}^{ + 0.7}$	${7.0}_{- 1.2}^{+ 0.6}$ $7.0_{ - 1.2}^{ + 0.6}$

Random

	${8.1}_{- 0.3}^{+ 0.7}$ $8.1_{ - 0.3}^{ + 0.7}$	${8.1}_{- 0.4}^{+ 0.7}$ $8.1_{ - 0.4}^{ + 0.7}$

Notes. The absolute best values are presented for cADI, ADI-PCA, and single RSDI methods. For the reference libraries, the mean of the ten best results is provided, as this metric was selected to evaluate performance.

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