hi_mpi_vpc_get_perspective_lut

Applicability

Product	Supported
Atlas A3 training products/Atlas A3 inference products	√
Atlas A2 training products/Atlas A2 inference products	√
Atlas 200I/500 A2 inference products	√
Atlas inference products	☓
Atlas training products	☓

Description

Obtains a pixel position remapping LUT of perspective transformation according to the pixel position coordinates in the input and output images. This API is synchronous.

Prototype

hi_s32 hi_mpi_vpc_get_perspective_lut (hi_point_pair_info *point_pair_info, hi_u32  interpolation, hi_remap_lut *remap_lut)

Parameters

Parameter	Input/Output	Description
point_pair_info	Input	Four pairs of pixel coordinates in the input and output images. Each pair contains pixel coordinates of an input image and an output image, respectively.
interpolation	Input	The following resizing algorithms are supported: 0: conventional bilinear algorithm, whose compute process is close to that of OpenCV. 1: conventional nearest neighbor algorithm, whose compute process is close to that of OpenCV.
remap_lut	Input and output	Pixel position remapping LUT of perspective transformation. In the hi_remap_lut structure: When lut is used as an input, you must allocate memory in advance. The memory size lut_size can be obtained by calling hi_mpi_vpc_get_lut_mem_size. When lut is used as an output, you can obtain the affine transformation LUT information from the memory after this API is successfully called.

Returns

0: success
Other values: failure (VPC Return Codes)

Parent topic: Vision Preprocessing Core (VPC)