OpenExplorer
Guide
Horizon Smart Car Developer Community
Horizon Official Website
Guide
Horizon Smart Car Developer Community
Horizon Official Website
English

Rotate

The Rotate operator calculates the input image rotated by a certain angle by establishing the mapping relationship between pixels in the image, which is commonly used for picture adjustment.

Operator Effect

Input ImageParameterOutput Image
image90clockwiseimage
image180clockwiseimage
90counter_clockwiseimage

Principle

The principle of operator realization is as follows:

VP5rotate1

The input picture is mapped to different rotational positions according to different rotation angles, and the length and width of the operator conforms to the following constraints:

{dst.width=src.widthdst.height=src.height180clockwise\begin{cases}dst.width=src.width\\dst.height=src.height\end{cases}180clockwise

{dst.height=src.widthdst.width=src.height90clockwise、90counter_clockwise\begin{cases}dst.height=src.width\\dst.width=src.height\end{cases}90clockwise、90counter\_clockwise

API Interface

int32_t hbVPRotate(hbUCPTaskHandle_t *taskHandle, hbVPImage *dstImg, hbVPImage const *srcImg, hbVPRotateDegree rotateDegree);

For detailed interface information, please refer to hbVPRotate.

Usage

// Include the header #include "hobot/hb_ucp.h" #include "hobot/vp/hb_vp.h" #include "hobot/vp/hb_vp_rotate.h" // init Image, allocate memory for image data hbUCPSysMem src_mem; hbUCPMallocCached(&src_mem, src_stride * src_height, 0); hbVPImage src_img{HB_VP_IMAGE_FORMAT_Y, HB_VP_IMAGE_TYPE_U8C1, src_width, src_height, src_stride, src_mem.virAddr, src_mem.phyAddr, nullptr, 0, 0}; hbUCPSysMem dst_mem; hbUCPMallocCached(&dst_mem, dst_stride * dst_height, 0); hbVPImage dst_img{HB_VP_IMAGE_FORMAT_Y, HB_VP_IMAGE_TYPE_U8C1, dst_width, dst_height, dst_stride, dst_mem.virAddr, dst_mem.phyAddr, nullptr, 0, 0}; // init param hbVPRotateDegree rotate_code{HB_VP_ROTATE_90_CLOCKWISE}; // init task handle and schedule param hbUCPTaskHandle_t task_handle{nullptr}; hbUCPSchedParam sched_param; HB_UCP_INITIALIZE_SCHED_PARAM(&sched_param); sched_param.backend = HB_UCP_DSP_CORE_0; // create task hbVPRotate(&task_handle, &dst_img, &src_img, rotate_code); // submit task hbUCPSubmitTask(task_handle, &sched_param); // wait for task done hbUCPWaitTaskDone(task_handle, 0); // release task handle hbUCPReleaseTask(task_handle); // release memory hbUCPFree(&src_mem); hbUCPFree(&dst_mem);