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[modules]edgeflow: fixed unstable fps problem

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k.n.mcguire@tudelft.nl
2016-02-24 12:03:37 +01:00
parent a7226ee743
commit 1307c0a808
2 changed files with 92 additions and 98 deletions
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sw/airborne/modules/computer_vision/lib/vision/edge_flow.c
+87 -94
View File
@@ -6,6 +6,7 @@
*/
#include <lib/vision/edge_flow.h>
static uint32_t timeval_diff2(struct timeval *starttime, struct timeval *finishtime);
void test_function(struct image_t *img,struct image_t *img_gray)
{
@@ -210,67 +211,82 @@ void line_fit(int32_t *displacement, int32_t *divergence, int32_t *flow, uint32_
//return total_error / size;
}
/**
* Calculate the difference from start till finish
* @param[in] *starttime The start time to calculate the difference from
* @param[in] *finishtime The finish time to calculate the difference from
* @return The difference in milliseconds
*/
uint32_t timeval_diff2(struct timeval *starttime, struct timeval *finishtime)
void draw_edgeflow_img(struct image_t *img, struct edge_flow_t edgeflow, struct edgeflow_displacement_t displacement, int32_t *edge_hist_x)
{
uint32_t msec;
msec = (finishtime->tv_sec - starttime->tv_sec) * 1000;
msec += (finishtime->tv_usec - starttime->tv_usec) / 1000;
return msec;
struct point_t point1;
struct point_t point2;
struct point_t point1_prev;
struct point_t point2_prev;
struct point_t point1_extra;
struct point_t point2_extra;
uint16_t i;
for(i = 120; i<240;i++)
{
point1.y = -(uint16_t)edge_hist_x[i]/100 + img->h/3;
point1.x = i;
point2.y = -(uint16_t)edge_hist_x[i+1]/100 + img->h/3;
point2.x = i+1;
point1_prev.y = -(uint16_t)displacement.horizontal[i]*5 + img->h*2/3;
point1_prev.x = i;
point2_prev.y = -(uint16_t)displacement.horizontal[i+1]*5 + img->h*2/3;
point2_prev.x = i+1;
image_draw_line(img, &point1,&point2);
image_draw_line(img, &point1_prev,&point2_prev);
}
point1_extra.y = (edgeflow.horizontal_flow+edgeflow.horizontal_div * -180 )/ 100+ img->h/2;
point1_extra.x = 0;
point2_extra.y = (edgeflow.horizontal_flow+edgeflow.horizontal_div * 180 )/ 100 + img->h/2;
point2_extra.x = 360;
image_draw_line(img, &point1_extra,&point2_extra);
}
void edgeflow_calc_frame(struct opticflow_t *opticflow, struct opticflow_state_t *state, struct image_t *img,
struct opticflow_result_t *result)
{
// Define Static Variables
static struct edge_hist_t edge_hist[MAX_HORIZON];
static uint8_t current_frame_nr = 1;
struct edge_flow_t edgeflow;
static uint8_t previous_frame_offset[2] = {0,0};
static uint8_t counter_check = 0;
static uint8_t current_frame_nr = 0;
static struct edge_flow_t edgeflow;
static uint8_t previous_frame_offset[2] = {1,1};
/*static uint32_t previous_time = 0;//sys_time.nb_tick;
static uint16_t freq_counter = 0;
static uint8_t frequency = 0;
freq_counter++;
if ((sys_time.nb_tick - previous_time) > sys_time.ticks_per_sec) { // 1s has past
frequency = (uint8_t)((freq_counter * (sys_time.nb_tick - previous_time)) / sys_time.ticks_per_sec);
freq_counter = 0;
previous_time = sys_time.nb_tick;
}
printf("freq %d\n",frequency);*/
// printf("freq %d\n",frequency);
// Define Normal variables
struct edgeflow_displacement_t displacement;
uint8_t disp_range = DISP_RANGE_MAX;
uint16_t RES = 100;
// Calculate current frame's edge histogram
int32_t *edge_hist_x = edge_hist[current_frame_nr].horizontal;
int32_t *edge_hist_y = edge_hist[current_frame_nr].vertical;
calculate_edge_histogram(img, edge_hist_x, 'x',0);
calculate_edge_histogram(img, edge_hist_y, 'y',0);
//edge_hist[current_frame_nr].frame_time = img->ts;
// Copy frame time and angles of image to calculated edge histogram
memcpy(&edge_hist[current_frame_nr].frame_time, &img->ts, sizeof(struct timeval));
edge_hist[current_frame_nr].pitch = state->theta;
edge_hist[current_frame_nr].roll = state->phi;
// Adaptive Time Horizon:
// if the flow measured in previous frame is small,
// the algorithm will choose an frame further away back from the
// current frame to detect subpixel flow
if (MAX_HORIZON > 2) {
uint32_t flow_mag_x, flow_mag_y;
flow_mag_x = abs(result->flow_x);
flow_mag_y = abs(result->flow_y);
uint32_t flow_mag_x, flow_mag_y;
flow_mag_x = abs(edgeflow.horizontal_flow);
flow_mag_y = abs(edgeflow.vertical_flow);
uint32_t min_flow = 3;
uint32_t max_flow = disp_range - 3;
uint32_t max_flow = disp_range*RES - 3*RES;
uint8_t previous_frame_offset_x = previous_frame_offset[0];
uint8_t previous_frame_offset_y = previous_frame_offset[1];
// IF statements which will decrement the previous frame offset
// if the measured flow of last loop is higher than max value (higher flow measured)
// and visa versa
if (flow_mag_x > max_flow && previous_frame_offset_x > 1)
previous_frame_offset[0] = previous_frame_offset_x - 1;
if (flow_mag_x < min_flow && previous_frame_offset_x < MAX_HORIZON - 1)
@@ -281,24 +297,28 @@ void edgeflow_calc_frame(struct opticflow_t *opticflow, struct opticflow_state_t
previous_frame_offset[1] = previous_frame_offset_y + 1;
}
//Wrap index previous frame offset from current frame nr.
uint8_t previous_frame_x = (current_frame_nr - previous_frame_offset[0] + MAX_HORIZON) %
MAX_HORIZON; // wrap index
MAX_HORIZON;
uint8_t previous_frame_y = (current_frame_nr - previous_frame_offset[1] + MAX_HORIZON) %
MAX_HORIZON; // wrap index
MAX_HORIZON;
//Select edge histogram from the previous frame nr
int32_t *prev_edge_histogram_x = edge_hist[previous_frame_x].horizontal;
int32_t *prev_edge_histogram_y = edge_hist[previous_frame_y].vertical;
struct edgeflow_displacement_t displacement;
//Calculate the corrosponding derotation of the two frames
int16_t der_shift_x = -(int16_t)((edge_hist[previous_frame_x].roll - edge_hist[current_frame_nr].roll) * (float)img->w / ( OPTICFLOW_FOV_W));
int16_t der_shift_y = -(int16_t)((edge_hist[previous_frame_x].pitch - edge_hist[current_frame_nr].pitch) * (float)img->h / ( OPTICFLOW_FOV_H));
// Estimate pixel wise displacement of the edge histograms for x and y direction
calculate_edge_displacement(edge_hist_x, prev_edge_histogram_x,
displacement.horizontal, img->w,
opticflow->window_size, disp_range, 0);
opticflow->window_size, disp_range, der_shift_x);
calculate_edge_displacement(edge_hist_y, prev_edge_histogram_y,
displacement.vertical, img->h,
opticflow->window_size, disp_range, 0);
opticflow->window_size, disp_range, der_shift_y);
uint16_t RES = 100;
line_fit(displacement.horizontal, &edgeflow.horizontal_div,
&edgeflow.horizontal_flow, img->w,
opticflow->window_size + disp_range, RES);
@@ -306,71 +326,44 @@ void edgeflow_calc_frame(struct opticflow_t *opticflow, struct opticflow_state_t
&edgeflow.vertical_flow, img->h,
opticflow->window_size + disp_range, RES);
uint16_t i;
result->flow_x = (int16_t)edgeflow.horizontal_flow/(previous_frame_offset[0]*RES);
result->flow_y = (int16_t)edgeflow.vertical_flow/(previous_frame_offset[1]*RES);
float fps_x = 0;
float fps_y = 0;
if(counter_check>MAX_HORIZON)
{
printf("%d\n",img->ts.tv_sec);
printf("%d %d %d %d \n",current_frame_nr,previous_frame_x, img->ts.tv_usec, edge_hist[previous_frame_x].frame_time.tv_usec);
printf("1: %d\n",timeval_diff2(&edge_hist[previous_frame_x].frame_time, &img->ts));
printf("2: %d\n",timeval_diff2(&edge_hist[previous_frame_y].frame_time, &img->ts));
float time_diff_x = (float)(timeval_diff2(&edge_hist[previous_frame_x].frame_time, &edge_hist[current_frame_nr].frame_time)) / 1000;
float time_diff_y = (float)(timeval_diff2(&edge_hist[previous_frame_y].frame_time, &edge_hist[current_frame_nr].frame_time)) / 1000;
float time_diff_x = (float)(timeval_diff2(&edge_hist[previous_frame_x].frame_time, &img->ts)) / 1000.;
float time_diff_y = (float)(timeval_diff2(&edge_hist[previous_frame_y].frame_time, &img->ts)) / 1000.;
fps_x = 1/(time_diff_x);
fps_y= 1/(time_diff_x);
result->fps = (fps_x + fps_y)/ 2;
}
else
counter_check++;
fps_y = 1/(time_diff_y);
result->fps = fps_x;
float vel_hor = edgeflow.horizontal_flow * fps_x* state->agl * OPTICFLOW_FOV_W / (img->w * RES);
float vel_ver = edgeflow.vertical_flow * fps_y * state->agl * OPTICFLOW_FOV_H / (img->h * RES);
result->vel_x = vel_ver;
result->vel_y = - vel_hor;
struct point_t point1;
struct point_t point2;
struct point_t point1_prev;
struct point_t point2_prev;
struct point_t point1_extra;
struct point_t point2_extra;
for(i = 120; i<240;i++)
{
point1.y = -(uint16_t)edge_hist_x[i]/100 + img->h/3;
point1.x = i;
point2.y = -(uint16_t)edge_hist_x[i+1]/100 + img->h/3;
point2.x = i+1;
point1_prev.y = -(uint16_t)displacement.horizontal[i]*5 + img->h*2/3;
point1_prev.x = i;
point2_prev.y = -(uint16_t)displacement.horizontal[i+1]*5 + img->h*2/3;
point2_prev.x = i+1;
image_draw_line(img, &point1,&point2);
image_draw_line(img, &point1_prev,&point2_prev);
}
point1_extra.y = (edgeflow.horizontal_flow+edgeflow.horizontal_div * -180 )/ 100+ img->h/2;
point1_extra.x = 0;
point2_extra.y = (edgeflow.horizontal_flow+edgeflow.horizontal_div * 180 )/ 100 + img->h/2;
point2_extra.x = 360;
image_draw_line(img, &point1_extra,&point2_extra);
#if OPTICFLOW_DEBUG && OPTICFLOW_SHOW_FLOW
draw_edgeflow_img(img, edgeflow,displacement, *edge_hist_x)
#endif
current_frame_nr = (current_frame_nr + 1) % MAX_HORIZON;
}
/**
* Calculate the difference from start till finish
* @param[in] *starttime The start time to calculate the difference from
* @param[in] *finishtime The finish time to calculate the difference from
* @return The difference in milliseconds
*/
static uint32_t timeval_diff2(struct timeval *starttime, struct timeval *finishtime)
{
uint32_t msec;
msec = (finishtime->tv_sec - starttime->tv_sec) * 1000;
msec += (finishtime->tv_usec - starttime->tv_usec) / 1000;
return msec;
}
sw/airborne/modules/computer_vision/lib/vision/edge_flow.h
+3 -2
View File
@@ -36,8 +36,8 @@ struct edge_hist_t {
int32_t horizontal[IMAGE_WIDTH];
int32_t vertical[IMAGE_HEIGHT];
struct timeval frame_time;
int16_t roll;
int16_t pitch;
float roll;
float pitch;
};
struct edgeflow_displacement_t {
@@ -63,5 +63,6 @@ void calculate_edge_histogram(struct image_t *img, int32_t edge_histogram[],
void calculate_edge_displacement(int32_t *edge_histogram, int32_t *edge_histogram_prev, int32_t *displacement,
uint16_t size, uint8_t window, uint8_t disp_range, int32_t der_shift);
uint32_t getMinimum(uint32_t *a, uint32_t n);
void draw_edgeflow_img(struct image_t *img, struct edge_flow_t edgeflow, struct edgeflow_displacement_t displacement, int32_t *edge_hist_x);
#endif /* EDGE_FLOW_H_ */