WarpPerspective
ThexFperspective
function performs the perspective transformation on the image. It takes inverse transformation as input and applies perspective transformation with a 3x3 matrix.
Calculate the input position corresponding to every output pixel as following:
API Syntax
template< int INTERPOLATION_TYPE ,int SRC_T, int ROWS, int COLS,int NPC> void xFperspective(xF::Mat & _src_mat,xF::Mat & _dst_mat,float *transformation_matrix)
Parameter Descriptions
The following table describes the template and the function parameters.
Parameter | Description |
---|---|
INTERPOLATION_TYPE | Interpolation technique to be used XF_INTERPOLATION_NN - Nearest Neightbour XF_INTERPOLATION_BILINEAR - Bilinear |
SRC_T | Input pixel type. Only 8-bit, unsigned, 1 channel is supported (XF_8UC1) |
ROWS | Maximum height of input and output image (must be a multiple of 8) |
COLS | Maximum width of input and output image (must be a multiple of 8) |
NPC | Number of pixels to be processed per cycle; possible options are XF_NPPC1 and XF_NPPC8 for 1 pixel and 8 pixel operations respectively. |
_src_mat | Input image |
_dst_mat | Output image |
transformation_matrix | Inverse Perspective Transformation matrix |
Resource Utilization
The following table summarizes the resource utilization of the kernel in different configurations, generated usingVivado HLS 2017.1tool for the Xilinx Xczu9eg-ffvb1156-1-i-es1 FPGA, to process a grayscale HD (1080x1920) image for Bilinear interpolation.
Name |
Resource Utilization | |
---|---|---|
1 pixel | 8 pixel | |
300 MHz | 150 MHz | |
BRAM_18K | 223 | 233 |
DSP48E | 191 | 293 |
FF | 17208 | 14330 |
LUT | 14458 | 18969 |
CLB | 3230 | 3876 |
Performance Estimate
The following table summarizes the performance of kernel for different configurations, as generated usingVivado HLS 2017.1tool for the Xilinx Xczu9eg-ffvb1156-1-i-es1, to process a grayscale HD (1080x1920) image for Bilinear interpolation.
Operating Mode | Operating Frequency (MHz) |
Latency Estimate |
---|---|---|
Max (ms) | ||
1 pixel | 300 | 19.3 |
8 pixel | 150 | 15.5 |