- Gain map is MxN down-sampled, M being the
horizontal sampling factor, N being the vertical sampling factor, M and N being
{8,16,32.64,128 } independently. For a given frame size, choice of M and N has
to be made to ensure the entire LSC LUT to fit into LSC LUT memory.
- The size of the internal memory is based on a
5Mpix sensor (2592x1944) with 32x64 downscaling ratio. As such the size is
approximately 20,832 bytes-( 5248 locations with 4 Bytes/location)
- Every two locations are used to store the channel gains for 8 color channels.
Alternatively, the memory can be programmed to support 4 color channels with
each location storing channel gains for 4 color channel, Table 4 lists a few
example M and N configurations for either 8 or 4 color channels. Note supporting
8 color channels is only for LSC_CH_MODE = 2.
- Support 8-bit entry in the gain map (in U8Q8,
U8Q7, U8Q6, and U8Q5 format with optional base of 1.0 to shift the range
up)
Figure 7-37 illustrates the LSC active region and map up-scaling feature. (The maps are stored independently per color channel)