Table 1.
Description of the simulated images.
| Image number | Source origin | Source processing | Factor | PSF | Noise | Lens model |
|---|---|---|---|---|---|---|
| 1 | NASA, ESA jpeg | Shapelets | 5 | Gaussian | P+G | SPEP |
| 2 | HFF fields | ⋆G− | 4 | Gaussian | SNR = 10 | SIE |
| 3 | HFF fields | ⋆G− | 2 | Gaussian | SNR = 100 | SIS |
Notes. Symbol ⋆G− stands for convolution by a Gaussian kernel and subtraction of the median (see text). Column factor stands for the resolution factor between source and lens plane. For instance, in image 1, the source has five times more pixels on the side than the image. Gaussian PSFs were used in all three images with a FWHM of 2 pixels, P+G stands for Gaussian poisson mixture. Gaussian noise with σ = 2 was used. The poisson noise value at pixel i is drawn from a Gaussian distribution with 
, fi being the flux in pixel i.
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