Best way to test "real" screen resolution, test patterns?

[moham_96]

Hi,
I'm looking into buying a 4k tv, i've read somewhere that there are screens that advertise themselves as 4k and fool you with the resolution but in fact the real resolution is different, so i searched about how to find the real resolution and came up with this Test Your 4K Device True Resolution With a 4K UHD / 2160p Video Test Pattern
i tested these patterns on my friend's 4k tv and according to the test the tv is not really a 4k tv.
I also found these patterns which i didn't know how to use (any one knows ?)
3 ISF Test Patterns for Ultra HD 4K Display Calibration
so i'm wondering is this pattern test sufficient to tell that the tv is not really a 4k tv ? are there any better ways to know for sure ?
The tv is running android so if there is an app that do these kind of test it would be awosome

[gefattern]

Hi moham_96 ,

if this is true the Companys are lying to there Customers , if i press the links i come back to Freaktab.com ,

a JOKE OR WHAT ???

nice Day

gefattern

[kevin1341]

Here is one

http://www.cnx-software.com/2014/09/26/test-your-4k-device-true-resolution-with-a-4k-uhd-2160p-video-test-pattern/

Cheers
Kevin

[kevin1341]

Here is the other one

http://www.cepro.com/article/3_isf_test_patterns_for_ultra_hd_4k_display_calibration

[moham_96]

Hi moham_96 ,

if this is true the Companys are lying to there Customers , if i press the links i come back to Freaktab.com ,

a JOKE OR WHAT ???

nice Day

gefattern

Yes they do, they make a screen that tell your source (for example a setup box) that the screen can accept 4k res video, and then downscale the stream to 1080p.
The first link posted by kevin1341 is the link i posted

[moham_96]

Here is the other one
http://www.cepro.com/article/3_isf_t...ay_calibration

I've seen those before but don't have any idea how to use them, let us know if you know.