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comparing two images

please can anyone provide the code for comparing two images of any type(ppm,pgm,pbm,jpg etc..) and the output will be the number of pixel difference.

Thanks in advance.

SOLUTION

cup

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Infinity08

>> The way I'd approach this is to convert both the images to a common format an then compare them in the common format.
The reason this is a better approach, is because all images are represented differently, and not all of them store the data pixel by pixel. Some are extrapolated, others use vectors. There's also compression to take into account. In the end it's easier to convert to eg. PNG or GIF like cup suggested.

Razor2k5

Hi,

Try to serialize the data as a bit stream.
Then you perform an XOR operation and you got the results. Only different bit pairs are resulted.

Suhas .

ASKER

Yes,
using fopen we can get the data of two files and comparing byte by byte we get the no. of difference in bytes.

can you please send the code to comare two images of any type?

Infinity08

That's a bit too much work for us to do it for you ... instead read the suggestion made by cup again, and try to work it out yourself. If you have specific questions and or problems about that, feel free to ask them in this thread, and we'll be glad to help you out with them.

ASKER CERTIFIED SOLUTION

srinims