	WWW: Use this form to send us your feedback.
	Orders: Use this form to place your order(s).
	Corporate Office: Voice:(949) 858-4216 Fax: (949) 858-5022
	Sales and Service: Voice:(858) 874-2547 Fax: (858) 874-2549
	E-Mail: ariel1@ix.netcom.com gideon@arielnet.com
	Corporate Office 6 Alicante Street Trabuco Canyon, CA 92679 U.S.A.
	Sales and Service: 4885 Ronson Court, Suite A San Diego, CA 92111 U.S.A.
	The Webmaster 6 Alicante Trabuco Canyon, CA 92679 U.S.A.

Camera Resolution

Gideon asked me to help with your questions regarding JVC DVL9600 or DVL9800 camcorders in high speed mode.

I think your analysis of the pixel dimensions for these camera models is basically correct. Assuming NTSC, one starts with a frame which is 720x480. Separating the two fields which are 1/60 sec apart results in a whole field size of 720x240. Then if one considers 120Hz with horizontal panels the optimal size would be 720x120, or vertical panels 360x240. At 240 hz the optimal panel size would be 360x120.

As a practical matter, JVC does not split the panels optimally. In practice the real panel sizes approximately are:

120Hz Horizontal 720x240

120Hz Vertical 300x240

240Hz 300x185

The two cameras in question are great cameras. They offer much higher that standard image rates of a very affordable price. This makes them a very attractive choice for biomechanical analysis. However there clearly is a tradeoff involved, higher image rate for lower resolution. One can get both the higher image rate without loss of resolution but only at a high price.

I hope this helps.

Jeremy Wise, PhD

Dir R&D