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Problem with "compute_shift_list" #64

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FFalkenbergM opened this issue Aug 16, 2022 · 3 comments
Open

Problem with "compute_shift_list" #64

FFalkenbergM opened this issue Aug 16, 2022 · 3 comments

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@FFalkenbergM
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FFalkenbergM commented Aug 16, 2022

Percebi que em algumas das minhas séries de imagens o "compute_shift_list" tem gerado uma lista de shifts incorreta.

Por exemplo:

Quando eu executo o comando:

"shift_list = compute_shift_list(hd94851_framesv,ref_image=0, algorithm='cross-correlation', upsample_factor=10)"

o shift list de um conjunto de 16 imagens de uma estrela padrão sai da seguinte forma:

image dx dy
1.0 0.0 0.0
2.0 60.1 58.9
3.0 0.9 -2.3
4.0 0.3 -2.1
5.0 0.9 -1.7
6.0 0.4 -1.8
7.0 1.2 -1.0
8.0 1.8 0.1
9.0 2.3 1.3
10.0 2.3 3.2
11.0 2.7 5.1
12.0 2.3 4.1
13.0 1.9 2.2
14.0 1.7 1.7
15.0 1.2 1.4
16.0 0.8 0.9

Percebi que na imagem n.2 o shifts estão deslocados (aparentemente o algoritmo está confundindo feixe ordinário com o extraordinário). Já verifiquei manualmente que esse shift da imagem 2 não é real.

Além disso, quando eu mudo a imagem de referência os shifts mudam de uma forma que não faz sentido pra mim:

"shift_list = compute_shift_list(hd94851_framesv,ref_image=1, algorithm='cross-correlation', upsample_factor=1000)"

image dx dy
1.0 -60.103 -58.881
2.0 0.0 0.0
3.0 -0.501 -0.6950000000000001
4.0 -0.33 -1.396
5.0 1.038 -1.058
6.0 -1.158 -1.147
7.0 0.501 1.296
8.0 1.685 2.531
9.0 2.833 3.84
10.0 -0.18 4.471
11.0 0.788 5.782
12.0 0.69 4.705
13.0 0.317 3.001
14.0 0.696 2.161
15.0 0.295 1.873
16.0 3.885 2.348

E também:

"shift_list = compute_shift_list(hd94851_framesv,ref_image=2, algorithm='cross-correlation', upsample_factor=1000)"

image dx dy
1.0 -0.864 2.29
2.0 0.501 0.6950000000000001
3.0 0.0 0.0
4.0 -0.139 0.088
5.0 0.009 0.237
6.0 0.012 0.215
7.0 0.353 1.541
8.0 1.117 2.605
9.0 1.555 3.928
10.0 1.295 5.494
11.0 1.824 6.404
12.0 1.674 5.849
13.0 0.812 3.94
14.0 1.197 3.851
15.0 0.509 2.802
16.0 0.486 3.162

@FFalkenbergM FFalkenbergM changed the title Problema com o "compute_shift_list" Problem with "compute_shift_list" Aug 16, 2022
@juliotux
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Você tentou usar o algorítimo asterism-matching?

@claudiavr
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claudiavr commented Aug 16, 2022 via email

@juliotux
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#67

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