On Sat, 27 Sep 2008 14:36:16 +1200, Colin.D wrote:
tacit, 9/27/2008 12:51 PM:
In article ,
Mike Russell wrote:
You can’t bump the actual rez, but there are ways to improve the appearance of the image considerably. Averaging frames to get rid of noise. Masking and/or cloning material from adjacent frames to minimize motion blur.
Assuming a relatively static image frame to frame. And even then, the amount of image information is still limited to the (low) resolution of the recorded image itself; ain’t no way ’round that.
Agreed. A standard PAL TV frame is 720 x 576 pixels, and I think NTSC is even smaller.
No way to make it better.
Au contraire, mon frere. There are any number of tricks that can be used to improve a video image, including the ones I mentioned already, here are a couple more:
1) if the image is static, combine several frames as layers, with the transparency of each additional layer set to 50 percent, 25 percent, 12 percent, and so one.
2) if the image pans around, combine the images as a mosaic to create a mini panorama. This will, indeed, give you a higher resolution image than the original. This is particularly interesting for animations, and certain matte paintings, where the entire original background can be recreated.
3) for interlaced images, use a mask of alternating black and white lines to get rid of motion artifacts from adjacent frames.
3) don’t forget color and contrast – use the full range from black and white, and keep the colors saturated to increase the snap of the image.
4) sharpening – convert to Lab and sharpen the L channel only. Blur the a and b channels slightly to get rid of color artifacting.
5) Video pixels are not square, and there are a number of ways to improve your images if you take this into account. When sharpening, for example, stretch the image vertically, apply your sharpening, and then compress the image back to its original aspect ratio.
—
Mike Russell –
http://www.curvemeister.com