comparison on how different capture devices produce different amounts of usefull (that means the portions of the image that actually carry the image and not black borders etc.) video image;
following boards were used,and images for each one are attached.....

my cards are "erazor3" and used "bt"(bt8x8 based) card,also there are few images made with Asus combo board with philips capture chip,and on the end "nvidia GeForce4 Ti 4200, Philips 7108"....

let's begin;

bt.jpg
erazor-704.jpg
erazor-704-768.jpg
erazor-768.jpg
philips-001.jpg
philips-002.jpg
philips-002-768.jpg
704x576(2).jpg (GeForce4)
720x576(2).jpg (GeForce4)

few explanations;these are all originals (what is captured is displayed on the images) EXCEPT for the images erazor-704-768.jpg and philips-002-768.jpg ,where original image was resized to 768x576 so i can compare it easier to the bt's normal 768 capturing......

for first 7 images you can use "HRT1" logo as a reference on how's AR changing,and for last two images (courtesy of Wilbert Dijkhof) well,you can't use that (hehe)......
but as i expect wilbert will share some more info on the sources of this images and perhaps we'll find out why his capture has so much of those black borders......

forum thread is located here:
neuron2's Video Processing forum ,so drag your butt over there if you have at least 2 capture devices and can provide some screenshots from both so AR they give is camparable....

i believe i can add some more shots (if i find them on my cdr's) where the difference between pure analog capturing (analog satellite transmission) versus DVB (mpeg2 over the satellite) can be shown.....(both captured with same capture device....DVB receiver was used as a source for analog capturing of DVB transmission...not an ideal situation as far as image quality is concerned,but will serve the purpose.....)

/ivo (a.k.a. i400)

[this page 16.08.2003 00:52h]