Native 1080p TV Questions [Newbie Questions]

I'll first get the apology out of the way for asking what probably are
very obvious questions.

Now, what I was wondering about was, AFAIK, my TV is native 1080p.
It's a Sony KDSR60XBR2. And it's my understanding that it will
upconvert a 420p and 1080i feed to 1080p.

What I was wondering was though, does the upconverted 1080p displayed
on a 1080p native TV such as mine fed from a 1080i source, such as the
Xbox360, have an inferior picture quality compared to a true 1080p
source?

What I recall from a while ago is how some native 1080p Sony TV owners
were complaining that the TV wasn't able accept Xbox360's 1080p feed
because the TV can only accept a 1080p source through HDMI and of
course, the Xbox360 doesn't have an HDMI port. But what always
perplexed me was, since the TV will upconvert a 1080i feed to 1080p
anway, what the reason for the complaint was.

The only thing I could think of was that a 1080p displayed from a
1080p source, thus not requiring an upconversion will always have a
superior picture quality than an upconverted 1080p displayed from a
1080i source.

Can someone please shed some light into this for me? If I'm way off
with this, then what would've been the reason for complaining by those
native 1080p Sony TV owners about their TVs not being able to accept a
1080p feed from the Xbox360? Thanks for your time and courtesy.

In article ,
No Way wrote:

What I was wondering was though, does the upconverted 1080p displayed
on a 1080p native TV such as mine fed from a 1080i source, such as the
Xbox360, have an inferior picture quality compared to a true 1080p
source?

Yes, if the scene contains horizontal motion. The original source will
have moved between the fields of the interlaced frame and the
progressive display will show the two displaced fields together, making
the interlace structure clearly visible.

--
Tom Stiller

PGP fingerprint = 5108 DDB2 9761 EDE5 E7E3
7BDA 71ED 6496 99C0 C7CF

Tom Stiller wrote:
In article ,
No Way wrote:

What I was wondering was though, does the upconverted 1080p displayed
on a 1080p native TV such as mine fed from a 1080i source, such as
the Xbox360, have an inferior picture quality compared to a true
1080p source?

Yes, if the scene contains horizontal motion. The original source
will have moved between the fields of the interlaced frame and the
progressive display will show the two displaced fields together,
making the interlace structure clearly visible.

When there is a 1080p output from a device such as HD DVD player, would not
this output be upscaled anyway by the player unless the recording is a true
1080p? In this case, it probably wouldn't matter if one chose to output
1080i and let the TV scale it to 1080p.

Are there any true 1080p recordings yet?

In article ,
"L Alpert" wrote:

Tom Stiller wrote:
In article ,
No Way wrote:

What I was wondering was though, does the upconverted 1080p displayed
on a 1080p native TV such as mine fed from a 1080i source, such as
the Xbox360, have an inferior picture quality compared to a true
1080p source?

Yes, if the scene contains horizontal motion. The original source
will have moved between the fields of the interlaced frame and the
progressive display will show the two displaced fields together,
making the interlace structure clearly visible.

When there is a 1080p output from a device such as HD DVD player, would not
this output be upscaled anyway by the player unless the recording is a true
1080p? In this case, it probably wouldn't matter if one chose to output
1080i and let the TV scale it to 1080p.


It's a temporal resolution issue, not a spatial resolution issue.

+--------------+
| | Position for first field
| |
| ---\ |
| ---/ |
| |
| |
+--------------+

+--------------+
| | Position for second field
| |
| ---\ |
| ---/ |
| |
| |
+--------------+

+--------------+

| | First field result

| ---/ |

| |



| | Second field result

| ---\ |

| |

+--------------+

+--------------+
| |
| | Proscan result
| ---\ |
| ---/ |
| |
| |
+--------------+

Are there any true 1080p recordings yet?

I don't know.

--
Tom Stiller

PGP fingerprint = 5108 DDB2 9761 EDE5 E7E3
7BDA 71ED 6496 99C0 C7CF