wi fi – Smartphone can’t connect to Google’s services unless resetting the WIFI connection

I’m using Samsung Galaxy Note 10 Plus, which has a very strange behavior that I can’t explain.

Everything works fine with 3G, 4G. But if I use my home’s wifi connection, sometimes I can’t access google search, youtube, play store. For example, I’m using the phone and need to do a quick google search, I open Chrome and input the keyword in the address bar, then hit Go. The browser will show that it’s loading the Google search, but will never finish unless I turn off the WIFI and reconnect, then hit F5 on the browser. The same issue for YouTube, Playstore.

I notice that this is the problem of my phone, because my wife’s Iphone does not have the same issue, and laptops also dont.

Can anyone explain this?

wireless networking – Smartphone can’t connect to Google’s services unless resetting the WIFI connection

I’m using Samsung Galaxy Note 10 Plus, which has a very strange behavior that I can’t explain.

Everything works fine with 3G, 4G. But if I use my home’s wifi connection, sometimes I can’t access google search, youtube, play store. For example, I’m using the phone and need to do a quick google search, I open Chrome and input the keyword in the address bar, then hit Go. The browser will show that it’s loading the Google search, but will never finish unless I turn off the WIFI and reconnect, then hit F5 on the browser. The same issue for YouTube, Playstore.

I notice that this is the problem of my phone, because my wife’s Iphone does not have the same issue, and laptops also dont.

Can anyone explain this?

Could an emulation of Bluetooth Keyboard on a smartphone be made to access the Microsoft Bluetooth Keyboard driver of Windows 10?

As I was searching for means to connect a Bluetooth Keyboard to windows 10 It seemed that I just need to pair the keyboard to the notebook by selecting the Microsoft proper Bluetooth driver.
When I searched the emulation of a Bluetooth Keyboard on an Android device I found that to interface it to Windows 10 there is a need for a piece of SW they call "server".
I wonder if there is a real need for it and if there is a way to use the Microsoft driver to work with the emulation of the Bluetooth Keyboard.

smartphone – Apple recycling overseen by EPRA?

I bricked my iPod Touch years ago by mounting it on a ghetto blaster with an iPod port. It was probably power line noise when I cranked the volume. I cannot factory reset. For the longest time, I didn’t know how to erase my personal data in the nonvolatile memory, short of physically pulverizing the components on the motherboard. Living in a tiny highrise apartment does not make that easy.

Today, I brought it to the Apple Genius Bar. The iPod Touch it’s so old that they can’t even send it to someone to remove the nonvolatile memory. In the end, I just decided to recycle it. It still bothered me.

After some websearching, found this webpage:”The Electronic Products Recycling Association (EPRA) is an industry-led not-for-profit that oversees a network of end-of-life electronics recycling facilities across Canada….is responsible for making sure Canada’s electronics recyclers meet strict provincial security, safety and environmental guidelines.”

Does anyone know whether Apple’s recycling falls under this program?


Background

I looked at the Ontario page for the EPRA, which references new recycling regulation. There’s not much there about due diligence in preventing recovery of data. According to the above article, the security comes from the fact that phone are “put…into the approved recycling track”, presumably meaning that materials are reused rather than the components.

Requirements for privacy in terms of biosensors, video and smartphone signals

I’m conducting research employing biosensors (i.e., heart rate and skin conductange signals), video data, smartphone signals (i.e., sensors such as accelereomter and gyroscope and touch data) and handwriting. A big problem is privacy, i.e. users are affected by privacy issues related to the collected data. Now, I would like to relate all these data sources to privacy, i.e. which one is less privacy-invasive and which one is more privacy-invasive. As far as I know, there exists no work relating biosensors, video data, smartphone signals and handwriting in terms of privacy. I only found the following paper:

Fanourakis, Marios. “A report on personally identifiable sensor data
from smartphone devices.” arXiv preprint arXiv:2003.06159 (2020).

These paper relates only smartphone data in terms of privacy.

A possibility would be to establish a certain number of requirements for privacy and then evaluating the data sources in terms of these requirements. For example, 3 requirements and each requirement could be rated on low (1), medium (2), high (3) in terms of the data sources. So, for example, video data could be rated as low for requirement 1, medium for requirement 2 and high for requirement 3 which would give a total sum of 6 (the higher sum the more privacy invasive). Of course I could just come up with such requirements but that is not very scientific.

Do such requirements exist regarding privacy? I was thinking about papers or also law. I know that there are different laws (e.g., the GDPR) but as far as I can see these laws are all pretty fuzzy. I think privacy is also linked to personal identifiable information, perhaps that could also be a way to go by coming up with requirements for personal identifiable information.

Of course if somebody knows a work which compares biosensors and smartphone data in terms of privacy, I would be happy to know about it.

photography basics – Continue taking photos from smartphone or buy a camera to practice?

I’ve recently been scanning a large collection of photos that we took decades ago.
I used a large 35mm SLR with several lenses and filters while my wife used a small fixed lens camera (35mm and before that a 110).

One thing I now notice about our photos is that my best photos are far better than her best (of course, why else would I lug all that heavy, bulky, inconvenient equipment with me?).
But, I also notice that I have far more really bad photos.

By good and bad I’m not talking about composition, but about things like exposure and depth of field.
I had full control over those aspects, and frequently got them wrong.
She had no choice, and given the tiny aperture, especially in the 110, her photos were generally all correctly exposed and focused.

In retrospect it’s easy to see that, like far too many other people, I incorrectly thought that a great camera would take great photographs.
In a few instances it did.
But in most cases all it did was provide me with multiple ways of making a mess of it.

Had I been intending to make photography a large part of my life, spending countless hours processing and printing my own film, practicing with hundreds of rolls, then buying that camera and lenses was a good start.

But that wasn’t my intent, and if I had it all to do over again, I’d go with a small and convenient point and shoot camera.
Using that, rather than worrying about all the settings, I might have concentrated more on composition, and learned what makes one photograph so much better than another.

That might have led me to be much more interested in the technical details of photography.
I would eventually have started stumbling over the limited capabilities of my equipment:

  • “The subject is so small, and enlarging the print only makes it look grainy.”
  • “The background is so well focused that the subject blends into it.”
  • “Everything else looks okay, but the subject’s face is totally washed out.”
  • “It’s great, but Fred moved his arm and it looks weird.”

I’d have learned:

  • why and how a telephoto lens could have been used to zoom in on a distant subject.
  • why and how a large aperture could have reduced the depth of field and blurred the background while keeping the subject in focus.
  • why and how underexposing the image could have provided perfect exposure for the subject making it stand out against the darker background.
  • why and how a faster shutter speed could have eliminated the motion blur.
    (But that would have needed a larger aperture, which would have reduced the field depth, so perhaps a “faster film” ISO setting would have been better.)

Today, the cost of film and processing is no longer an issue, so it’s cheap and easy to take hundreds of practice photos.

I’d suggest that you stick with your small and convenient camera and develop your composition skills.
As you get better, you’ll start running into “if only I could have …” situations.

If and when this bothers you enough, you’ll eventually buy a camera with detachable lenses and manually adjustable settings.
And since you’ll already have a basic understanding of why you need these extra features, you’ll quickly learn to use them properly.

android – what is used com.miui.securityadd in xiaomi smartphone?

android – what is used com.miui.securityadd in xiaomi smartphone? – Information Security Stack Exchange

ubuntu touch – how to update oppo smartphone

OPPO And Realme Flash Tool

The flash tool is a software that can help you to flash your phone. It has been designed for the devices of both brands, and it supports flashing any firmware version. You will find all the necessary files in this article so you can download them and use them on your device.

Desire: This is an easy-to-use program which will allow you to update your phone with ease without having to worry about losing data or not being able to boot up after the process has completed. It also comes with a lot of features such as backup/restore, factory reset, etc., which are very useful if something goes wrong during the process of updating your phone’s firmware. Action: Download now!

Using MTF, how can I discover the smallest detail a smartphone camera can resolve for use in generating QR codes?

Since most camera lens combinations have variable MTF across the field (that is, the system can usually resolve finer details in the center of the frame than on the edges and in the corners), there is no single “magic number”, even for a specific camera/lens combo.

Then there’s the variability introduced by low light/high ISO that reduces the amount of detail that the same system can resolve compared to when that system is used under more ideal conditions.

There’s also the fact that most scans will not be made with the phone perfectly aligned with the QR code. So the minimum theoretically possible size under “perfect” conditions with the target framed perfectly level by the phone and perfectly perpendicular to the phone’s sensor won’t work if the phone is tilted and/or rotated several degrees with respect to the target QR code.

In the end you have to “aim low” if you want to create QR codes that can be compatible with a large majority of phones.

As for the QR codes themselves, the major variables are:

  • Scanning distance. A QR code on a billboard that will be scanned from 40-50 feet needs to be quite a bit larger than a QR code on a business card that will be scanned from about 12 inches.
  • The amount of data encoded. The more data you want to encode, the more discrete squares called data units arranged in rows and columns your QR code will need, and the larger it must be for each row and column to be the same size. A 25×25 QR code with 625 data units can be smaller than a 125×125 QR code with 2132 data units.
  • The design features of your QR code. If you want to make it something other than a plain B&W “bar code” looking QR code, you need to include plenty of error correction (which increases the total data needed to communicate the same amount of information). QR codes that have colors or are embedded in an image attract more scans than plain B&W QR codes do.
  • Printing considerations. Since printers often scale images, using vector graphics is usually best for QR codes. There also needs to be good contrast between the QR code and the background upon which it is printed.

There are a variety of resources on the net that address this. Here are four that are helpful:

QR Code Minimum Size: Calculate ideal size for your use case
What Size Should a QR Code Be in Relation to Scan Distance?
What is the ideal print size of a QR Code?
QR Code Minimum Size: How Small Can a QR Code Be?

Discover smallest resolvable detail of smartphone camera with MTF

Given a chart I created myself, resembling e-sfr charts, a smartphone and a MTF plot, how could I discover the smallest resolvable detail, dimension wise ? The problem with smartphones is that we don’t always have all of the technical hardware information.

To give more context, I’d like to create the smallest QR code that could be read by a smartphone camera when printed. Mine in the occurrence is the Xiaomi MI 9 SE, however, I’d like it to work with any.

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