c# - Looking for more efficient software zoom -

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i using c#, winforms application aforge library pull video usb camera , manipulate video.

i doing using new frame event handler , posting image picturebox. far, has worked , done want.

however, found out need add software zoom application. solution increase size of overall image , grab section of new, larger image, fit measurements needed. done on every new frame.

     int imagetopy;      int imagetopx;      rectangle rect;       bitmap = new bitmap(bitmap, new size(bitmap.width * zoomtrackbar.value,                                            bitmap.height * zoomtrackbar.value));       imagetopy = ((bitmap.height - height) / 2);      imagetopx = ((bitmap.width - width) / 2);       if (imagetopy != 0 && imagetopx != 0)              rect = new rectangle(imagetopx, imagetopy, width, height);      else              rect = new rectangle(0, 0, width, height);        bitmap = (bitmap)bitmap.clone(rect, bitmap.pixelformat)

this need to. however, not @ efficient. when zoome level hits 3, video becomes exceptionally laggy. there latency of 1-2 seconds between video feed , going on. can , little dance, , time sit down in chair, me in video starts doing little dance :-p

any suggestions on better way achieve trying do? maybe more streamlined?

instead of enlarging overall image, cut out section wish zoom in , fill window image. way, having max image size of video window , not enlarging overall image beyond window's constraints.


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