Re: Re: GIF Image Processing

To asnwer your question - yes, I want to detect edges without decompression. I realize that this is not going to be very accurate. However, I'm not going for accurasy, I'm going for crude functionality and SPEED.

I have done research in the past, and I know that detection without decompression is possible for JPEGs (see here) JPEGs are much more involved in encoding. If it's possible to do edge detection with JPEGs, I only assume that it is also possible to do it with GIFs since that encoding algorithm is MUCH simpler.

Comment on Re: Re: GIF Image Processing

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Re: Re: Re: GIF Image Processing by shotgunefx (Parson) on Jan 22, 2002 at 14:29 UTC
Jpegs are in my understanding, store rectangular sections of the image ( If I remember stored coefficients), so I guess you could do edge detection as the compressed data represents some sort of semblance to what is encoded, but GIF's are just LWZ encoded chunks. I don't see any way you could determine what's in it without decompressing. -Lee "To be civilized is to deny one's nature."	[reply]