SPRUJ28E November 2021 – September 2024 AM68 , AM68A , TDA4AL-Q1 , TDA4VE-Q1 , TDA4VL-Q1
Distortion in wide angle lenses causes output block size to be very small due to extreme scaling in particular regions of the Image. This could be caused by high field-of-view or viewing position. The range of “Ratio of Output block to input pixel block size” is very high across the frame.
In order to solve this, LDC supports dividing the frame into multiple regions and output block size can be programmed independently for each region. Frame can be divided up to 9 regions. Frame can be divided into maximum of three slices horizontally and maximum of three slices vertically as shown in Figure 6-133. All the regions in a vertical slice share the common horizontal start location and all the regions in a horizontal slice share the common vertical start location. Width of vertical slices can be configured using VPAC_LDC_REGN_W12_SZ[13-0] W1, VPAC_LDC_REGN_W12_SZ[29-16] W2 and PAC_LDC_REGN_W3_SZ[13-0] W3 register fields. Height of horizontal slices can be configured using VPAC_LDC_REGN_H12_SZ[13-0] H1, VPAC_LDC_REGN_H12_SZ[29-16] H2 and VPAC_LDC_REGN_H3_SZ[13-0] H3 register fields.
Hardware will process the each region as independent frame, hence processing of the pixels will in 2D sequence with in the region. Up on completing processing of one region, it will process next region in raster direction.