true 960h vs FAKE 960h

[akv 0]

hello

i got today a 960h dvr that's looks like a fake to me

what is fake?

this is photo that was taken from an older d1 dvr

http://i.cubeupload.com/WOMAtF.jpg

this photo was taken from the new 960h dvr

http://i.cubeupload.com/ETihhx.jpg

 

as you can see, this is EXACT same photo, SAME CORNERS, just stretched

 

 

now, there are two options:

1. the D1 dvr was compressed the 960h sensor into d1 resolution

2. the 960h dvr was taken a d1 and stretched it into 960h resolution

to me, the d1 photo looks more natural and the 960h looks too wide like it was stretched and it's a fake 960h dvr.

what do you think?

any way to test this?

 

here is a comparison

http://i.cubeupload.com/qHBK1W.png

[shawn3090 0]

Are you using 960h cameras or d1?

[akv 0]

Are you using 960h cameras or d1?

yes, but i wanted to switch to 960h dvr and it looks like it's not real 960h because it's the same corners, same photo, just stretched.

http://ipvm.com/report/hd_analog_shootout

[Securame 0]

yes, but i wanted to switch to 960h dvr and it looks like it's not real 960h because it's the same corners, same photo, just stretched.

 

And what did you actually expect? You do have more resolution. WHere you have 704x576, now you have 960x576.

 

Did you think that changing the DVR would make your camera see wider? The DVR just turns the analog video signal it receives from the camera into 0s and 1s. You do have more resolution now, so you have more detail. But changing the DVR won't change the angle the camera is seeing.

[iSpy Security 0]

i agree with you mind twist the dvr only improve the resolution of the cameras but is not going to chance the angle on the camera. thanks iSpy Security

[ak357 0]

i agree with you mind twist the dvr only improve the resolution of the cameras but is not going to chance the angle on the camera. thanks iSpy Security

No DVR on market improve resolution of any cameras !

Reduce Yes

Improve NO

[akv 0]

yes, but i wanted to switch to 960h dvr and it looks like it's not real 960h because it's the same corners, same photo, just stretched.

 

And what did you actually expect? You do have more resolution. WHere you have 704x576, now you have 960x576.

 

Did you think that changing the DVR would make your camera see wider? The DVR just turns the analog video signal it receives from the camera into 0s and 1s. You do have more resolution now, so you have more detail. But changing the DVR won't change the angle the camera is seeing.

 

 

i thought the D1 dvr using part of the sensor of 960h camera, sometimes this exist for example dahua 3mp ip camera using the whole sensor only when using the maximum resolution. i know more cases when cameras cropping part of the image, sometimes in order to remain the aspect ratio(using 4:3 sensor to shoot 16:9 1080P video) or sometimes it's a hardware limitation.

 

why should it not be wider?

960x576 IS WIDER than 704x576. the common sense tell you that if you get a 960x576 native resolution camera, you should get 960x576 dvr. now, you might say that i had before d1 dvr, so it probably made the picture looks "narrower" than real ("make people taller"), but this is the opposite case. the D1 dvr looks natural, real aspect ratio, native, and the 960h dvr looks stretched to wider, even the 960h dvr is matched to the camera resolution and the d1 dvr is not.

there are no extra details using the 960h dvr.

how can it be that 704x576 capture the exact field of view like 960x576?

they are different aspect ratio.

if sony claim their sensor and chipset is 960x576 NATIVE PIXELS, and when you use 960x576 dvr it looks too wide, stretched, and not showing any additional details, the conclusion is that sony are lying about the true pixels, they are not 960x576 pixels, they are something else and has been stretched

now, where is the "extra details"?

those 2 pictures took from the same dvr, one at d1, other on 960h mode. d1 even looks a little more detailed and the natural not stretched:

http://i.cubeupload.com/IDnf0K.png

http://i.cubeupload.com/nWgGXk.png

 

look also in this review on the 960H field of fiew part

http://ipvm.com/report/hd_analog_shootout

[SensUp 0]

960x576 IS WIDER than 704x576. the common sense tell you that if you get a 960x576 native resolution camera, you should get 960x576 dvr. now, you might say that i had before d1 dvr, so it probably made the picture looks "narrower" than real ("make people taller"), but this is the opposite case. the D1 dvr looks natural, real aspect ratio, native, and the 960h dvr looks stretched to wider, even the 960h dvr is matched to the camera resolution and the d1 dvr is not.

there are no extra details using the 960h dvr.

how can it be that 704x576 capture the exact field of view like 960x576?

 

Here's the short answer: the pixels are not square, they are double length rectangles. That's why you get more horizontal detail but same vertical. That's why the fov doesn't change.

 

You may not notice the extra detail when looking at it distorted in width. Your Dvr should display it without stretching.

If your Dvr only shows it stretched, and you want to verify more details then take a snapshot into photoshop and use the non-square pixel option to make the picture look right.

 

Here is a free PUBLIC article on 1280H on IPVM which mostly applies. Note John H. who wrote the article, at least initially, believes it is just stretching. But about 1/3 way down in the comments look for J Hall and others to set him straight.

http://ipvm.com/report/worst-hd-quality-camera

[survtech 0]

Are you using 960h cameras or d1?

yes, but i wanted to switch to 960h dvr and it looks like it's not real 960h because it's the same corners, same photo, just stretched.

http://ipvm.com/report/hd_analog_shootout

Welcome to the wonderful world of pseudo-HD. Do yourself a favor - switch to real HD such as IP, HDCVI, HD-TVI or HD-SDI.

[SensUp 0]

now, where is the "extra details"?

those 2 pictures took from the same dvr, one at d1, other on 960h mode. d1 even looks a little more detailed and the natural not stretched:

http://i.cubeupload.com/IDnf0K.png

http://i.cubeupload.com/nWgGXk.png

 

Have a look.

Side by side D1-Left and 960H-Right with Pixel Aspect Ratio Correction of .7331 at 100% Magnification

http://i.imgur.com/JE1VZJY.jpg

Side by side D1-Left and 960H-Right with Pixel Aspect Ratio Correction of .7331 at 1000% Magnification

http://i.imgur.com/fW9D604.jpg

 

Hardly anything to brag about, but clearly not stretching either. A (very) little less pixelated in general. The 0 in the license plate is better.

This adjustment for the elongated pixel should be done by your 960H DVR, which makes it the correct image aspect ratio. Why it is not doing it I don't know. Have you tried viewing from the DVR directly?

 

Try it yourself if you have photoshop, under view change the Pixel Aspect Ratio to a custom one of .7331. Good luck!