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Messages - vader

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I'm out and about at the moment, but will try too post again with examples later. The Astro uses a quad bayer sensor. This means instead of the normal bayer pattern, you have 4 pixels in a square for each colour. You normally have one line with green, red, green red etc, and another with blue, green, blue, green etc. The cmera device interpolates (guesses) what the colour shouuld be where it is missing. Green is most sensitive to the human eye, hence it has twice the pixels. In a quad bayer, it has to do more guessing on the colour. Secndly, quad bayer tends to be used with high pixel sensors, so each well (pixel) is quite small.

Appoologies in advance fr the physics stuff......

A pixel is like a bucket, and photons (light) are ike rain dops. The drops fall into the buckets, and if you time the exposure to the rain, the bucket will fill up dependiing on how much rain goes in. A small bucket still fills up to the same height as a large bucket in heavy rain, however in light rain, if the bucket is small, it starts missing rain drops. Sometimes it might get a few eetra, some times a few less. This is noise. The larger the bucket, the lower the percentage of missed or extra raindrops and the more accurate the reading of how much rain was captured.

So going back to cameras, the bucket is a pixel on a sensor, and the image is made up of the levels of all the bckets. The larger the bucket, the lower the noise. When more photons bombard the well, the lower the noise. Combinnig pixels in a quad bayer sensor results in effectively a bigger bucket. Interpolating (guessing) also adds noise, so using the full sensor wll result in more noise than pixel binning (bigger bucket). Add in to this HDR, which amplifies llow light levels and you add even more noise. I did a few very quick tests, and using the default camera (not open camera), when you select 12MP and turn off HDR, you actually get quite an impreessively low noise, high quality image.

What I am trying to say in this overly long, but hopefully helpful post, is that the noise is a result of the processing options chosen for the photo. High res, hdr images will produce large gobs of noise when you zoom in, but lok quite good zoomeed out. For the best result, give the camera a chance and shoot 12MP, low ISO (if available) and turn off HDR.

Phones like the pixels, iphones, galaxies have even mre tricks and take multiple photos, averaging them to remove noise. That is called computational photography. You can do this yourself after the fact on a PC with excellent results if you really want.

I'll post examples later today.

Astro Slide - Hardware / Re: Keyboard ghosting
« on: January 02, 2023, 07:08:10 pm »
I don't seem to have the same space iissue everyone else has.So long as I don't press the space key too high (close to the c, v, b and n keys) it works in all positions horizontally. Pressing too high causes the key to "stick" and doesn't depress all the way. I normally use my thumb when to press the space when in "laptop" mode meaning no missed spaces (as per this post in fact).

Astro Slide - Hardware / Re: ear phone noise
« on: January 02, 2023, 06:23:21 pm »
I did a bit of testing with the 3.5mm jack over Christmas. There is something CPU based - maybe GPU causing the sound. I tried many dev options including restricting BG processes with no luck.

When the screen is off, there is no noise. When the lock screen is showing, there is no noise. When you unlock, the noise appears. Using BT or USB headphones, there is no noise, as others have said. On my astro the sound is quite soft, so any reasonably loud audio drowns out the noise

I too have the fabled speaker antenna for the FM radio :)

EDIT: plugging in a dummy 3.5mm cord (eg a synth patch cable) in a strong FM area means you can use the speaker with no noise. It is a pitty the speakers are so tinny.

EDIT 2: Using an equaliser and dropping the 4kHz responnse (or increasing everything bar 4k) does wonders for the small speakers. Almost sounds good. Response under 60Hz is nn existant so don't expect booming basses.

Astro Slide - Hardware / Performance comparison
« on: December 25, 2022, 03:19:35 am »
So, I tried a little experiment the other day. I loaded the WebGL aquarium on my Cosmo, Astro and a work RAZR (8+ gen 1)

1024x1024  canvas, 10000 fish, duckduckgo browser.

Cosmo - 9 fps
Astro - 23 fps
Razr - 37 fps

So the Astro, in a real world test is 2.5 times faster than Cosmo. The latest and greatest is only around 60% faster. Not bad I think.

Astro Slide - Hardware / Re: ear phone noise
« on: December 18, 2022, 09:56:59 pm »
This has been an issue since the gemini. Normally, when the audio starts, the noise goes away. In FM radio mode, when you have a strong signal, the noise goes away too. Turning off the screen also helps. You can solve the noise issue by using Bluetooth headphones, or a USB-C to 3.5mm jack.

Astro Slide - Android / Re: Several issues - workaround or upgrade?
« on: December 15, 2022, 12:35:23 am »
I also noticed that OpenCamera takes much better photos - but then again, it defaulted to full 48 MP. I think the basic camera app just takes 9 MP pictures by default?

If you go to the settings, and set 48MP in the default camera, then the photos are quite good. The other resolution I use is 12MP, which makes use of the quad bayer filter to pixel bin, and get a really nice shot. The main thing is to remove HDR as it just adds (lots of) noise and makes the photo look quite bad. In good light, the photo quality is actually quite impressive - in bad light it becomes very noisy very quickly. I use OpenCamera a lot, but in this case for some reason the photos didn't come out as well as I thought they should have. The photos might not be S22 good, but in good light they look pretty crisp on a 4K, 42 inch monitor. I couldn't find a raw mode with the default camera app, but OC could do it. Using snapseed on the raw image can make it look really good.

In my opinion though, the default camera app takes better "happy snap" photos than OC.

Astro Slide - Android / Re: video camera error
« on: December 15, 2022, 12:25:39 am »
What settings are you using? I enabled EIS and set to 1920x1080. Recorded a few videos, long and short. I zoomed with pinch whilst videoing and was able to view the results with no issues. The only thing I noticed was the soft audio - but maybe I haven't tweaked the mic volume. Were you using 1920 or 4K video?

When I got mine 2 days ago, the battery history said the last charge was 195 days ago. That is over 6 months since it was powered on and tested. So the manufacture date was at the beginning of June (maybe late May - to be tested in June). Yours has also been manufactured I would bet, just not delivered. I was contribution ID: 21xx, on April 6th 2020. Yours should be on its way soon.

Astro Slide - General Discussion / Re: First impressions
« on: December 14, 2022, 02:08:27 am »
I'm in the same boat. Got mine on Monday (12th December). It is a big boy. When the phone is in keyboard mode, it is really tight and stable - impressively so. As a phone, it is large. It feels bigger than the cosmo. The performance is good, not astounding, but good. The camera is a surprise - I thought it would be terrible after seeing a few reviews. It is actually capable of some reasonable photos. The biggest trick is to turn off HDR mode. Overall, if I had received this a year ago, I would be over the moon in happy street. At the end of 2022, it is still good enough, but not really a patch on my work phone (with 8+ Gen 1 chipset).

As a small laptop, running termux and other laptoppy things, the astro is beyond awesome. As a phone, I am still making up my mind however it hasn't run up any red flags yet. Definitely a pass mark when put under the microscope. I do like the feel of the phone, especially the redesigned bottom half. I think it would have felt odd if the larger battery weren't added and the case flattened out.

Astro Slide - Android / Re: Several issues - workaround or upgrade?
« on: December 14, 2022, 01:50:42 am »
I noticed that the camera takes fairly poor photos with HDR on. If you turn it off, the photos are actually pretty good. The look quite nice on my 42 inch 4K monitor, so should be more than adequate for most uses :) The camera app is somewhat featureless, however the settings (icon in the top left) allows you to get to the real settings (settings cog icon at the bottom). You can change a few things, including resolution. The 12mp photo uses 4 pixel binning for a better shot, and the 48mp is pretty much just the sensor. I tried OpenCamera, and it has far more bells and whistles, however I thought the photos weren't as good as the stock camera app. More playing required I think.

It is much better than I was led to believe by most accounts. I've only had the astro a few days, so I still haven't finished playing with all the bits :) I really like the "open" mode - it is significantly better than the cosmo for stability. It feels like a little laptop.

I can confirm I have the same problem. Rather than fix the issue, I went after the symptom :) i installed sshd under termux, generated ssh keys (ssh-keygen -A), set a password (using the popup keyboard), then started the server on port 2022.

I installed termbot, and connected to localhost:2022 using the username for termux and the password I set. All good. Termbot is a much better terminal than termux in any case, and you don't lose keystrokes. Yes there is an issue, however it doesn't bother me any more.

Cosmo Communicator - Android / Termux or UserLand - Linux & LXDE or XFCE
« on: December 31, 2019, 12:39:21 am »
I perosnally just installed xSDL, the X11 repos for termux, and xfce4. Export the display variable, start xSDL then  run startxfce4. You will have to modify your setup to increase the font size etc, but it all works. I installed  netsurf as a basic web browser, and the xfce4 terminal app. Already had gcc and most of the libraries - compile your own binaries

Cosmo Communicator - General Discussion / Camera
« on: December 15, 2019, 10:24:26 pm »
Quote from: drpeter
Small correction: according to the link it's a 1/2.8" format sensor  
Yep, absolutely correct, I didn't pick that one up

Cosmo Communicator - General Discussion / Camera
« on: December 15, 2019, 07:33:43 pm »
After a bit of digging, I found out some info on what I believe is the module in the cosmo. I believe it is the Samsung tetracell (quad bayer filter) 24MP 0.9um 1/2.3 inch sensor. This is a true 24MP sensor, which in low light, can automatically pixel bin for greater well depth. It isn't an 8mp upscaled to 24, and in my tests, it performs quite well. The actual model appears to be the 24MP ISOCELL Slim 2x7 ( ). Now there are conversations to be had about sensors with sub micrometer pixel sizes, but the main benefit is that in good light, it is easier to fill the well, and you can get good DR with high resolution. In lower light (eg. night mode), the sensor will bin pixels to gather more light per "pixel", but at lower resolution.

The main problem with small pixels, is a small well size. This means that amplification (ie. ISO) causes noise due to quantization. Keeping the ISO down, and exposure times long decreases the amplification, and hence noise for a better picture. The default camera app tends to go for quick shots with high ISO, resulting in more noise. Apps like OpenCamera can give you manual control so that you can lower the ISO and get a better shot, or alternatively in NR mode, take 4, 8 or even 12 shots and median filter to get rid of noise. So, I believe the camera module is quite capable, and with the correct software can take good shots.

EDIT: should have reread shuntcap's post a few above. Basically says the same thing. Quad bayer does have advantages (and disadvantages), but the take away is that it needs the correct settings to achieve good results, probably more so than standard bayer pattern sensors. With the right settings, however, it can produce excellent results.

Cosmo Communicator - CoDi / CODI update
« on: December 10, 2019, 11:52:03 pm »
It appears there are two parts to the flash, resources and image. For me, the resources fails every time, so I never even get to try the firmware update. I have cleared the cache/data for the cover app, and started again. Failed first time as I expected (I think it has for everybody else too), but we'll see how it goes. 46% so far. I must say that up till now, everything was going well with the cosmo.

Getting closer.....The resources has succeeded, but the firmware failed. The firmware is much smaller than the resources, so I can retry many times. All up, 18 attempts to get the resources flashed. First 6 attempts at the firmware file have failed, but luckily it only takes a few minutes each failure.

Yehar! Finally - on the 10th attempt for the firmware (after 18 for the resource file) we are there!!!!!! PERSISTANCE wins the day.

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