From 455b2fc06ff590914f3a1fb13261510d2b95de2e Mon Sep 17 00:00:00 2001
From: AlexeyAB <alexeyab84@gmail.com>
Date: Thu, 21 Jun 2018 11:45:43 +0000
Subject: [PATCH] Able letterbox for video
---
src/image.c | 31 +++++++++++++++++++++++++++++++
src/demo.c | 14 +++++++++++---
2 files changed, 42 insertions(+), 3 deletions(-)
diff --git a/src/demo.c b/src/demo.c
index 6929e08..34627ce 100644
--- a/src/demo.c
+++ b/src/demo.c
@@ -52,18 +52,23 @@
void draw_detections_cv_v3(IplImage* show_img, detection *dets, int num, float thresh, char **names, image **alphabet, int classes, int ext_output);
void show_image_cv_ipl(IplImage *disp, const char *name);
image get_image_from_stream_resize(CvCapture *cap, int w, int h, int c, IplImage** in_img, int cpp_video_capture, int dont_close);
+image get_image_from_stream_letterbox(CvCapture *cap, int w, int h, int c, IplImage** in_img, int cpp_video_capture, int dont_close);
int get_stream_fps(CvCapture *cap, int cpp_video_capture);
IplImage* in_img;
IplImage* det_img;
IplImage* show_img;
static int flag_exit;
+static int letter_box = 0;
void *fetch_in_thread(void *ptr)
{
//in = get_image_from_stream(cap);
int dont_close_stream = 0; // set 1 if your IP-camera periodically turns off and turns on video-stream
- in_s = get_image_from_stream_resize(cap, net.w, net.h, net.c, &in_img, cpp_video_capture, dont_close_stream);
+ if(letter_box)
+ in_s = get_image_from_stream_letterbox(cap, net.w, net.h, net.c, &in_img, cpp_video_capture, dont_close_stream);
+ else
+ in_s = get_image_from_stream_resize(cap, net.w, net.h, net.c, &in_img, cpp_video_capture, dont_close_stream);
if(!in_s.data){
//error("Stream closed.");
printf("Stream closed.\n");
@@ -89,9 +94,12 @@
free_image(det_s);
- int letter = 0;
int nboxes = 0;
- detection *dets = get_network_boxes(&net, det_s.w, det_s.h, demo_thresh, demo_thresh, 0, 1, &nboxes, letter);
+ detection *dets = NULL;
+ if (letter_box)
+ dets = get_network_boxes(&net, in_img->width, in_img->height, demo_thresh, demo_thresh, 0, 1, &nboxes, 1); // letter box
+ else
+ dets = get_network_boxes(&net, det_s.w, det_s.h, demo_thresh, demo_thresh, 0, 1, &nboxes, 0); // resized
//if (nms) do_nms_obj(dets, nboxes, l.classes, nms); // bad results
if (nms) do_nms_sort(dets, nboxes, l.classes, nms);
diff --git a/src/image.c b/src/image.c
index dd0098f..a2dc3ca 100644
--- a/src/image.c
+++ b/src/image.c
@@ -1068,6 +1068,37 @@
return im;
}
+image get_image_from_stream_letterbox(CvCapture *cap, int w, int h, int c, IplImage** in_img, int cpp_video_capture, int dont_close)
+{
+ c = c ? c : 3;
+ IplImage* src;
+ if (cpp_video_capture) {
+ static int once = 1;
+ if (once) {
+ once = 0;
+ do {
+ src = get_webcam_frame(cap);
+ if (!src) return make_empty_image(0, 0, 0);
+ } while (src->width < 1 || src->height < 1 || src->nChannels < 1);
+ printf("Video stream: %d x %d \n", src->width, src->height);
+ }
+ else
+ src = get_webcam_frame(cap);
+ }
+ else src = cvQueryFrame(cap);
+
+ if (cpp_video_capture)
+ if (!wait_for_stream(cap, src, dont_close)) return make_empty_image(0, 0, 0);
+ *in_img = cvCreateImage(cvSize(src->width, src->height), IPL_DEPTH_8U, c);
+ cvResize(src, *in_img, CV_INTER_LINEAR);
+ image tmp = ipl_to_image(src);
+ image im = letterbox_image(tmp, w, h);
+ free_image(tmp);
+ if (cpp_video_capture) cvReleaseImage(&src);
+ if (c>1) rgbgr_image(im);
+ return im;
+}
+
int get_stream_fps(CvCapture *cap, int cpp_video_capture)
{
int fps = 25;
--
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