http://cdn.sci-news.com/images/2018/04/ ... -Disks.jpgThese disks are wildly different in size and shape: some contain bright rings, some dark rings, and some even resemble hamburgers.
http://www.sci-news.com/astronomy/spher ... 05903.html
http://cdn.sci-news.com/images/2018/04/ ... -Disks.jpgThese disks are wildly different in size and shape: some contain bright rings, some dark rings, and some even resemble hamburgers.
Thanks.seasmith wrote:http://www.sci-news.com/astronomy/spher ... 05903.html
Might have to buy one of the two articles promoed in the article. Yes, they are digitally created.Zyxzevn wrote:Thanks.seasmith wrote:http://www.sci-news.com/astronomy/spher ... 05903.html
But it seems to me that the images have been digitally "enhanced".
Any idea where I can find the original images?
Infrared Integral Field Spectrograph - IFS
The SPHERE integral field spectrograph (IFS) is a lenslet-based integral field unit (called BIGRE, Antichi et al. 2009), providing a 1.73” x 1.73” FOV that is Nyquist sampled at 0.95 µm. The IFS includes a flat calibration source and filters for accurate detector calibrations. The IFS instrument layout is displayed in Figure 4. The raw data 21000 spectra are aligned with the detector columns over a hexagonal grid rotated by ~10.7° with respect to the dispersion. Each spectrum from a spaxel is projected on a rectangular area of 5.1x41 pixels on the detector.
During data reduction, the image is translated into a (x,y,λ) data cube, which has for both available spectral resolutions a constant dimension of (291,291,38). Each image is resampled by the pipeline over a square regular grid at (7.4 mas)2 / spaxel. Data outside this region are meaningless.
https://www.eso.org/sci/facilities/para ... /inst.htmlNyquist sampling / Fourier Transform - Capturing images
In order to get images into a form computers can manipulate they must be modified from their analog form (continuous gradients) into a digital form (step gradients) using the technique of sampling.
Sampling: A technique used to record analog information by recording periodic snapshots. If the sampling rate is fast enough, the eye cannot discern the gaps between each snapshot when they are played back. This is the principle behind motion pictures. Sampling is the key technique used to digitize analog information such as sound, photographs, and images.
Dan, You know that image has been digitally pixel-multiplexed, frequency saturated and selectively contrasted,D_Archer wrote:A SPHERE image looks like this:
- a picture for ants.
This was the first image, look like splash damage.
The ring is said to be a dust ring, i think it is a dusty plasma ring and ionized to a degree.
[moderator edit - linked removed as per request of the poster]
Regards,
Daniel
Yes, and fracked by Hamiltoniansseasmith wrote:Dan, You know that image has been digitally pixel-multiplexed, frequency saturated and selectively contrasted,D_Archer wrote:A SPHERE image looks like this:
- a picture for ants.
This was the first image, look like splash damage.
The ring is said to be a dust ring, i think it is a dusty plasma ring and ionized to a degree.
[moderator edit - linked removed as per request of the poster]
Regards,
Daniel
at least...
Users browsing this forum: No registered users and 0 guests