Hello all; I, and several others are attempting to make use of camera vision in a machine shop environment, to auto position a lathe or milling machine for instance.
My current camera is the highest priced of the logitech webcams, with a nominally 5 megapixel format. But for our purposes, the field of view at 2540x19xx is at least 75 degrees. We need maybe 5 degrees because all we are interested in is the pixel under the center pixel of the crosshairs. This, when inspecting the workpiece from 50mm, should represent accuracy's in the thousandth of an inch category, and would generally be quite useful to us. So, is it possible to setup a framebuffer with 2 circular pointers, the input pointer writing the 5 megapixel image as it comes in, and an output pointer that only reads out the central 100x100 pixels of the image, maybe even 240x240 but for our uses its overkill. The problem as it exists now is the processing time for the video image to get thru camview-emc and actually be presented on our computer screens, is on the order of 3 to 5 seconds when the whole signal chain has to deal with the 2540x19xx format of a decent webcam. If we could throw away all but the mathematical central area of the image that the rest of the video chain had to process using only 1 core of a 1.4Ghz atom processor, it seems we could save many valuable seconds of image processing time. The V4L list didn't understand what I wanted, so everything they suggested threw away resolution which we don't want to do, and gave the same field of view in the output, but converted to useless fuzz. Hence I come here in search of help. Effectively, we need extreme telephoto at maybe 57,600 pixels (240x240 for this example) resolution, captured pixel by pixel from the central 57,600 pixels of the input for this application. Thank you for any usable suggestions. Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) An Irishman is never at peace except when he's fighting. A pen in the hand of this president is far more dangerous than 200 million guns in the hands of law-abiding citizens. _______________________________________________ xorg@lists.x.org: X.Org support Archives: http://lists.freedesktop.org/archives/xorg Info: http://lists.x.org/mailman/listinfo/xorg Your subscription address: %(user_address)s