RGBA to NV12 - 现金网注册平台,现金网博e百,真人百家乐游戏开户

ThexFrgba2nv12function converts a 4-channel RGBA image to NV12 (4:2:0) format. The function outputs Y plane and interleaved UV plane separately. NV12 holds the subsampled data, Y is sampled for every RGBA pixel and U, V are sampled once for 2row and 2columns (2x2) pixels. UV plane is of (rows/2)*(columns/2) size as U and V values are interleaved.

API Syntax

template  void xFrgba2nv12(xF::Mat & _src, xF::Mat & _y, xF::Mat & _uv)

Parameter Descriptions

The following table describes the template and the function parameters.

Table 1.xFrgba2nv12 Function Parameter Descriptions
Parameter	Description
SRC_T	Input pixel type. Only 8-bit,unsigned, 4-channel is supported (XF_8UC4).
Y_T	Output pixel type. Only 8-bit,unsigned, 1-channel is supported (XF_8UC1).
UV_T	Output pixel type. Only 8-bit,unsigned, 2-channel is supported (XF_8UC2).
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	Input RGBA image of size (ROWS, COLS).
_y	Output Y image of size (ROWS, COLS).
_uv	Output UV image of size (ROWS/2, COLS/2).

Resource Utilization

The following table summarizes the resource utilization of RGBA to NV12 for different configurations, generated usingVivado HLS 2017.1tool for theXilinx Xczu9eg-ffvb1156-1-i-es1FPGA, to process a HD (1080x1920) image.

Table 2.xFrgba2nv12 Function Resource Utilization Summary
Operating Mode	Operating Frequency (MHz)	Utilization Estimate
Operating Mode	Operating Frequency (MHz)	BRAM_18K	DSP_48Es	FF	LUT	CLB
1pixel	300	0	9	802	452	128

Performance Estimate

The following table summarizes the performance of RGBA to NV12 for different configurations, as generated usingVivado HLS 2017.1tool for theXilinx Xczu9eg-ffvb1156-1-i-es1, to process a grayscale HD (1080x1920) image.

Table 3.xFrgba2nv12 Function Performance Estimate Summary
Operating Mode	Latency Estimate
Operating Mode	Max Latency (ms)
1 pixel operation(300Mhz)	1.8