OMAP-L138: About the "VLIB_trackFeaturesLucasKanade_7x7" functionsin in the library of "vlib_c674x_3_3_0_3"

Part Number:OMAP-L138

Hello,

I have problem about the "VLIB_trackFeaturesLucasKanade_7x7"  functionsin in the library of "vlib_c674x_3_3_0_3".

There are four parameters in the "VLIB_trackFeaturesLucasKanade_7x7" function 

[in] x[] X feature coordinates in im1 (UQ12.4) 

[in] y[] Y feature coordinates in im1 (UQ12.4) 

[in,out] outx[] X feature coordinates in im2, user has to provide initial estimate of the location in current frame. In normal situation user can set this as same as previous frame location. (UQ12.4)

[in,out] outy[] Y feature coordinates in im2user has to provide initial estimate of the location in current frame. In normal situation user can set this as same as previous frame location. (UQ12.4)

What does the (UQ12.4) mean?

There hava many data format in the  library of "vlib_c674x_3_3_0_3" such as (UQ12.4) ,(SQ12.3),(UQ1.15)  and so on.

Is there any documentation of these data formats?

Thanks!