Nirav, I found your project only early this morning and am fascinated with your progress thus far. I will be following your developments eagerly. Also, I will be informing some of the other interest at the office about your work and see if any collaboration comes of it.
Seth On Thu, Jun 26, 2008 at 4:07 AM, Nirav Patel <[EMAIL PROTECTED]> wrote: > As you may know, OLPC got GSoC students again this summer. I am one > of them, and my project is Vision Processing. That is, a library to > use the webcam for more than capturing images. I am implementing this > by adding v4l2 and computer vision functions to pygame. > > My code is available at http://git.n0r.org/?p=pygame-nrp;a=summary and > is currently pygame 1.8.1 with the addition of a camera module that > supports v4l2 cameras that use MMAP and have pixelformats of RGB24, > RGB444, YUYV, SBGGR8, or YUV420. Basic usage is as follows: > > import pygame > from pygame import camera > > cam = camera.Camera("/dev/video0", (640, 480), "RGB") # the third > argument can be YUV or HSV too. > cam.start() > frame = cam.get_image() # the frame returned is a 24bit pygame Surface > > You can also do fun stuff like: > http://eclecti.cc/bytes/living-pointillism-a-pygame-webcam-script > or more practical stuff like having it track the centroid of a > specific hue (green in this case): http://eclecti.cc/files/centroid.py > > My plans are to add functions like finding the largest connected > component, optical flow, and other things useful for computer vision. > > Currently, performace is pretty poor on the XO; a combination of the > Geode being slow and having to convert from 24bit to 16bit surfaces to > display any captured frames. The XO is fast enough to capture and > blit a 320x240 RGB frame at 30fps, but not at 640x480 or a frame being > converted to HSV. I'm not sure how or if I'm going to be able to > overcome those performance problems. > > I'd appreciate any comments, suggestions, or reality checks on > improving performance or anything else, or any requests for vision > functions to add. Also, I only have the camera in the XO, vivi, and a > poorly supported USB webcam, so if anyone could test it on other > webcams, that would be great. > > Thanks, > > Nirav Patel > _______________________________________________ > Devel mailing list > Devel@lists.laptop.org > http://lists.laptop.org/listinfo/devel >
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