Focal length – how to find out which part of the picture is less distorted?

I suppose the least distorted rectangular part of a shot is defined by the focal length of the lens used, but I want to know which part is accurate or at least how that part is calculated.

I think you really have to start here:

What is the difference between perspective distortion and barrel or pincushion distortion?

… because there are different types of distortions and you really need to be clear before you can do anything about it.

The basic answer is that the perspective distortion depends entirely on the distance you have from the object. Therefore, the focal length plays only as large a role as it affects your image. For this reason, there is no clear line between "close-up of eccentric things that look weird" and something that our brain considers normal.

For distortions that are actually a lens flaw (pronounced "design trade-off"), there is no general answer since you need to characterize each lens (or find an existing "lens profile" that contains this characterization). For zoom lenses, this is likely to change as you change the focal length. However, this is due to the design of the zoom mechanism of each lens that is not native to the focal length,

Camera lenses that are sold for photography are usually intended for art rather than science. The design intent is to create an appealing rendering. Therefore, they are not always ideal when used as measuring instruments.

Back to the top: When you need to move the camera to fit more in the frame, it naturally means you change perspective. If your topic is not flat, there is nothing to do. If you cut out the parts that are distorted in relation to your first shot, you will cut out the information you got from moving. Your software can turn things around later to align them, but it can not compensate.

(The only solution is to take lots You can create images from slightly different views, create a 3D model, and then render the model instead of working with the lens's raw data. That's what our brains do.)

How do I install the kernel module for blk_mq's io schedulers?

I recently changed a single queue on my Oracle server to multiple queues. This server is Oracle Linux 6.10 (4.1.12 Kernel). I realize that there is no io scheduler for blk_mq, otherwise it will show that / sys / block // queue / scheduler is none. I think I need to install the kernel module for the io scheduler, but I do not know how to do that. How can I enable mq_deadline or bfq io scheduler for the multi-queue I / O block?

I can not log in to www.messenger.com, but I can sign up for the Facebook Messenger Android app

I have Facebook Messenger installed, but for privacy reasons, no "normal" profile on Facebook. Now FB Messenger does not let me login to www.messenger.com, but my password is correct because I can change my password in the Android Messenger app. I can not see my phone number in FB Messenger, but have tried all the phone numbers I had recently. It's also not possible to delete my account from the FB Android app. An attempt is being made to force me to log in to regular Facebook over the Internet. This is an authentication that I do not have or do not allow.

Is this legal at all and does it make it impossible for a user to delete their own data? How can I proceed? Of course, "help" and "support" are just a waste of time and another way of not answering questions.

I'm sorry that I've ever tried anything from Facebook. They are terrible!

I would like to use the thing normally: Install the app on multiple devices and log into www.messenger.com in "My Account". I can sign in to my Facebook Messenger Android App account. There I can also change my password, which proves that I know the right password.

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Programming Languages ​​- How do I determine if I am currently awake programmatically?

Let me explain the situation:

Every time I wake up, I shower, start my PC, make coffee, and sit down at my desk. I then double-click on a shortcut to a .bat file on the virtual desktop that launches my "life loop". (I do not start it automatically because it first needs to connect to the VPN and it gets messy for complicated reasons.)

The "life loop" is basically a "while (1) {…}" script that does all kinds of "jobs" all day long. Before the loop, the following code is executed:

"Is it less than 10 minutes since the computer was booted?"
"Have we not registered the last wake time within the last 20 hours?"

If both conditions are met, my script registers the approximate "last alarm time" as "current time minus 30 minutes" (to account for the time I need to get up, shower, and turn on the bed), PC, etc.).

Usually, and for the longest time, this works perfectly. However, as I feared, it was not registered today as it was apparently less than 20 hours (or more?) Ago since it was last registered.

That may be easy for all of you, but I've thought about it and refined it for a long time. However, it does seem like it's never going to be perfect, even though I'm looking for a pretty rigid "sleep / wake" scheme. It seems no matter how many hours I choose for the second condition, it will never suit every day. It's either too long or too short.

An obvious solution would of course be to have a separate link named "Start Life Loop and I just woke up" to manually state that this is definitely the time I woke up. However, this does not seem to be "clean" and it bothers me that I have to have two separate shortcuts to start my "life loop". It does not seem to be as nice as just doing a single link (or even starting it automatically at boot time, which I probably want sooner or later).

It is also common that I am forced to restart the computer during the day (or shut down and then turn it back on later) without intending to go to bed or sleep. It also happens that I have to temporarily stop the life loop without rebooting the computer to fix and test errors. For this reason, I can not always register the "wake up time" when I start the life loop.

It feels like there's an obvious solution to this problem that I just did not think about, but I'm sure I can not figure it out. Maybe the only sensible way to have my own link is when I'm really awake, and this simply can not be reliably determined by the logic of the script?

PS: Maybe I should make it clear that I do not have any hardware in my bed that could determine when Really Awake by analyzing my brainwaves or something crazy.

pgp – how do you simulate a gpg severkey DoS attack?

I tried to simulate this attack on my PC, but could not generate a poison key. I used Linux (Ubuntu 18.04) and GPG software (gpg (GnuPG) 2.2.4). I tried to manipulate the public key and import it into pubkeyring as a poisoned key, but unfortunately this failed.

test@GnuPG:~/Documents/gpg$ gpg --import manipulated_PK.asc

gpg: CRC error; 246C33 - A03158

gpg: read_block: read error: Invalid keyring

gpg: import from 'manipulated_PK.asc' failed: Invalid keyring

gpg: Total number processed: 0

I need your help in generating a large posioned key. Https://tech.michaelaltfield.net/2019/07/14/mitigating-poisoned-pgp-certificates/

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Digital Rights Management with PHP

Hey guys, I'm working on a video streaming service website that's completely PHP based.
I wanted to ask how I can embed or at least implement Digital Rights Management (DRM) technology in a few sample videos to demonstrate how DRM minimizes piracy. Basically, I want to know how to use PHP to easily and efficiently implement DRM into my website videos.
Many thanks.

Digital Rights Management with PHP

Hey guys, I'm working on a video streaming service website that's completely PHP based.
I wanted to ask how I can embed or at least implement Digital Rights Management (DRM) technology in a few sample videos to demonstrate how DRM minimizes piracy. Basically, I want to know how to use PHP to easily and efficiently implement DRM into my website videos.
Many thanks.