Rotate - 2023.1 English

API Syntax

Rotate function rotates the input image by 90, 180 or 270 degrees in clockwise direction.

template <int INPUT_PTR_WIDTH, int OUTPUT_PTR_WIDTH, int TYPE, int TILE_SZ, int ROWS, int COLS, int NPC>
void rotate(ap_uint<INPUT_PTR_WIDTH>* src_ptr,
                        ap_uint<OUTPUT_PTR_WIDTH>* dst_ptr,
                        int rows,
                        int cols,
                        int direction) {

The following table describes the template and the function parameters.

Table 695 Table Rotate Parameter Description
Parameter	Description
INPUT_PTR_WIDTH	Pixel width of input image pointer. Must be power of 2.
OUTPUT_PTR_WIDTH	Pixel width of output image pointer. Must be power of 2.
TYPE	Input and Output Pixel type. Only 8-bit, unsigned and 1,3 channels are supported(XF_8UC1, XF_8UC3)
TILE_SZ	Tile size
ROWS	Maximum height of the image (Must be multiple of NPC)
COLS	Maximum width of the image (Must be multiple of NPC)
NPC	Number of Pixels to be processed per cycle. NPPC1 and NPPC2 are supported.
src_ptr	Input Image pointer
dst_ptr	Output Image pointer
rows	Height of the image
cols	Width of the image
direction	Direction of rotate, possible values are 90, 180 or 270

Resource Utilization

The following table summarizes the resource utilization in different configurations, generated using Vitis HLS 2022.1 tool for the xcu200-fsgd2104-2-e, to process a 4k, 3 channel image.

Table 696 Table Rotate Resource Utilization Summary
Operating Mode	Direction of Rotate	Operating Frequency (MHz)	Utilization Estimate
Operating Mode	Direction of Rotate	Operating Frequency (MHz)	BRAM_18K	DSP	FF	LUT	URAM
1 Pixel	90	300	8	14	4373	4223	0
	180	300	8	14	4373	4223	0
	270	300	8	14	4373	4223	0
2 Pixel	90	300	8	18	6294	6532	0
	180	300	8	18	6294	6532	0
	270	300	8	18	6294	6532	0

Performance Estimate

The following table summarizes the performance estimates in different configurations, generated using Vitis HLS 2022.1 tool for the xcu200-fsgd2104-2-e, to process a 4k, 3 channel image.

Table 697 Table Rotate Performance Estimate Summary
Operating Mode	Operating Frequency (MHz)	Latency Estimate
Operating Mode	Operating Frequency (MHz)	Max (ms)
1 pixel	300	52.5
2 pixel	300	26.5