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How computer operate in order to grap & process an image file from a camera via fire wire card?

Basically would like to understand what would be the impact of processing time different between a 2MB image file & 6MB image file generated from each of 2 MP camera & 6MP camera towards a computer operates?
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Yes Callandor, you are right that the 6MP camera have lower Frame Rates of 5 FPS whereas 2MP camera is able to go for 15 FPS. Both are on fire wire interface (IEEE1394) cable towards a PCI base interface card . Is that possible to understand details of each data flow steps with info of transfer rates or bus speeds on a computer operates in Core 2 Duo 2.4Ghz for example ? Thanks!
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I see. It means that the camera FPS specs definitely comply to its limitation and will apply other type of interface like cameralink or GigE on high end camera (higher MP with high FPS camera)? Right? In this case, if the bottleneck is not on the firewire interface,  what should I focus on the 6.4MB each image file in terms of processing & analysis time towards my Core 2 Duo 2.4Ghz CPU system? Another question is any possible the system know how to utilize my graphic card (GPU=700Mhz) to take up the image processing load? Appreciate for any advice here. Thanks!
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