# 2017\_01\_13 visualization meeting

**URL:** <https://www.rubin.community/t/2017-01-13-visualization-meeting/1535>\
**Category:** Camera-DM Visualization\
**Created:** [January 11, 2017, 12:19am UTC](https://www.rubin.community/t/2017-01-13-visualization-meeting/1535 "2017-01-11T00:19:16Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![jjt](https://sea2.discourse-cdn.com/flex002/user_avatar/www.rubin.community/jjt/32/125_2.png) [@jjt](https://www.rubin.community/u/jjt)\
**Post date:** [January 11, 2017, 12:19am UTC](https://www.rubin.community/t/2017-01-13-visualization-meeting/1535/1 "2017-01-11T00:19:16Z")

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Bluejeans: 107541143  
UIUC people meet in Loomis

**Agenda:**

- FITS images
- Discuss header format for raft- and focal plane-scale images
- UIUC status

**Notes:**

- @tony_johnson has received a few hubdred images from BNL. They are of varying quality, butcan be used for code development/debugging.  
**Action:** @tony_johnson will generate some displayable (single extension) images (with and without overscan) using the [`HIERARCH` keyword](https://heasarc.gsfc.nasa.gov/docs/software/fitsio/c/f_user/node28.html) to combine headers.
- There will be a meeting at BNL in mid-February. Demo the SW and gather feedback.

**UIUC projects:**

- @weiren2 will install (in the development branch) the new code that was written over the break.
- UIUC will create a new deveopment branch that is commonly owned, so that @jbpagliuco and @ywang can also install code.
- Short term projects:
- **Action:** (all three students): Using `read_mouse`, specify regions by name, including whether it’s a data or overscan region.
- **Action:** @ywang: Generalize the `graph` function. For now:  
`graph_pixels`: pixel distribution in a region.  
`graph_noise`: noise for each of 16 CCD amplifiers or 72 raft amplifiers.  
`graph_projection`: average pixel for each row in a region.
- Somewhat longer term:
- `blink`: Switch between tao images, either on a clock, or by user command.
- Differences and ratios of images.

We need to discuss what, if any, image processing (_e.g._, `ax+b` gain and bias correction) we want to do before displaying an image.

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<div class="post-metadata">

**Author:** ![jjt](https://sea2.discourse-cdn.com/flex002/user_avatar/www.rubin.community/jjt/32/125_2.png) [@jjt](https://www.rubin.community/u/jjt)\
**Post date:** [January 11, 2017, 12:21am UTC](https://www.rubin.community/t/2017-01-13-visualization-meeting/1535/2 "2017-01-11T00:21:54Z")

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**Notes from meetings with students:**

* * *

2017\_01\_09:

- Histograms (with underflo and overflow bins) now work  
To do (low priority): Use color for clarity.

* * *

2017\_01\_11:

We have accomplished most of the [Near-term goals](https://www.rubin.community/uploads/short-url/p6E6hjKKqOqMXJ7jKESu5ClAX0H.pdf) (56.0 KB)  
(for mid-January.

Remaining (and new) projects:

- @weiren2

- Interface to image repository.  
Tony J tells us that we’ll have a non-zero set of images this week.

- Convert a region name (for now, the amplifier name) to a set of pixels.  
If appropriate, → a rect will work.

- Update development branch. Get write access for @jbpagliuco and @ywang.

- @ywang:

- rename `graph` to `graph_pixels`.

- Add a new function: `graph_amp_noise`. A histogram of the noise in  
each of the 16 CCD amplifiers or in the 72 raft amps.

- @jbpagliuco:

- If `read_mouse` is active, let the user pass the amplifier name as  
the region specifier in a command. Syntax: (`name` “amp\_name”).

- Expand the list of defaults to include command parameters.  
For example, the threshold parameter in `hot_pixel`.

- Everyone:

- Read the [User’s Guide](https://github.com/lsst-camera-visualization/frontend/wiki) and look for errors and omissions.