[opendtv] Re: Panasonic's AG-HVX200

>Now a question. Is not sharpness directly related to the ability to 
>perceive detail?
>  
>
No.

Sharpness is proportional to the square of the area under an MTF curve.  
An MTF curve plots contrast ratio against detail.

In my PBS presentation, I extracted two sections from a contrast 
sensitivity grating.  One, taken from the low-detail high-contrast 
section clearly appears to be sharp.  The other, taken from a 
moderate-detail moderate-contrast section does not.  I didn't choose 
high-detail low-contrast for the second, because then the audience 
wouldn't have been able to distinguish it from a grey block.

It's obvious in Tom Barry's Leno picture.  Compare the right side of the 
original to the right side of the filtered.  There are certainly 
differences, but they appear to be about the same sharpness even though 
the filtered one has half the detail in each direction.  The bulk of the 
sharpness is retained through the filtering because the MTF curve is so 
low in the highest octave of detail that it contributes very little to 
the square of the area.

Again, if anyone wants my PBS presentation, I'll be happy to send it, 
but be aware that it's about 1.5 MB.

Please ask for it off the list so as to keep the traffic down:
tvmark@xxxxxxxxxxxxx

TTFN,
Mark


 
 
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