class labeling corrections

detect.py

@@ -17,7 +17,8 @@ def detect(
         conf_thres=0.3,
         nms_thres=0.45,
         save_txt=False,
-        save_images=True
+        save_images=True,
+        webcam=False
 ):
     device = torch_utils.select_device()
     os.system('rm -rf ' + output)
@@ -37,6 +38,10 @@ def detect(
     model.to(device).eval()
 
     # Set Dataloader
+    if webcam:
+        save_images = False
+        dataloader = LoadWebcam(images, img_size=img_size)
+    else:
         dataloader = LoadImages(images, img_size=img_size)
 
     # Get classes and colors
@@ -44,8 +49,9 @@ def detect(
     colors = [[random.randint(0, 255), random.randint(0, 255), random.randint(0, 255)] for _ in range(len(classes))]
 
     for i, (path, img, im0) in enumerate(dataloader):
-        print("%g/%g '%s': " % (i + 1, len(dataloader), path), end='')
         t = time.time()
+        print("%g/%g '%s': " % (i + 1, len(dataloader), path), end='')
+        save_path = os.path.join(output, path.split('/')[-1])
 
         # Get detections
         img = torch.from_numpy(img).unsqueeze(0).to(device)
@@ -53,45 +59,48 @@ def detect(
             torch.onnx._export(model, img, 'weights/model.onnx', verbose=True)
             return  # ONNX export
         pred = model(img)
-        pred = pred[pred[:, :, 4] > conf_thres]
+        pred = pred[pred[:, :, 4] > conf_thres]  # remove boxes < threshold
 
         if len(pred) > 0:
+            # Run NMS on predictions
             detections = non_max_suppression(pred.unsqueeze(0), conf_thres, nms_thres)[0]
 
-        # Draw bounding boxes and labels of detections
-        if detections is not None:
-            save_path = os.path.join(output, path.split('/')[-1])
-
             # Rescale boxes from 416 to true image size
             detections[:, :4] = scale_coords(img_size, detections[:, :4], im0.shape)
 
+            # Print results to screen
             unique_classes = detections[:, -1].cpu().unique()
             for i in unique_classes:
                 n = (detections[:, -1].cpu() == i).sum()
                 print('%g %ss' % (n, classes[int(i)]), end=', ')
 
+            # Draw bounding boxes and labels of detections
             for x1, y1, x2, y2, conf, cls_conf, cls in detections:
                 if save_txt:  # Write to file
                     with open(save_path + '.txt', 'a') as file:
-                        file.write('%g %g %g %g %g %g\n' % (x1, y1, x2, y2, cls, cls_conf * conf))
+                        file.write('%g %g %g %g %g %g\n' %
+                                   (x1, y1, x2, y2, cls, cls_conf * conf))
 
-                if save_images:  # Add bbox to the image
+                # Add bbox to the image
                 label = '%s %.2f' % (classes[int(cls)], conf)
                 plot_one_box([x1, y1, x2, y2], im0, label=label, color=colors[int(cls)])
 
+        print('Done. (%.3fs)' % (time.time() - t))
+
         if save_images:  # Save generated image with detections
             cv2.imwrite(save_path, im0)
 
-        print('Done. (%.3fs)' % (time.time() - t))
+        if webcam:  # Show live webcam
+            cv2.imshow(weights, im0)
 
-    if platform == 'darwin':  # MacOS
+    if save_images and (platform == 'darwin'):  # MacOS
         os.system('open ' + output + '&& open ' + save_path)
 
 
 if __name__ == '__main__':
     parser = argparse.ArgumentParser()
-    parser.add_argument('--cfg', type=str, default='cfg/yolov3.cfg', help='cfg file path')
-    parser.add_argument('--weights', type=str, default='weights/yolov3.pt', help='path to weights file')
+    parser.add_argument('--cfg', type=str, default='cfg/yolov3-tiny.cfg', help='cfg file path')
+    parser.add_argument('--weights', type=str, default='weights/yolov3-tiny.pt', help='path to weights file')
     parser.add_argument('--images', type=str, default='data/samples', help='path to images')
     parser.add_argument('--img-size', type=int, default=32 * 13, help='size of each image dimension')
     parser.add_argument('--conf-thres', type=float, default=0.50, help='object confidence threshold')

utils/datasets.py

@@ -55,6 +55,42 @@ class LoadImages:  # for inference
         return self.nF  # number of files
 
 
+class LoadWebcam:  # for inference
+    def __init__(self, path, img_size=416):
+        self.cam = cv2.VideoCapture(0)
+        self.nF = 9999  # number of image files
+        self.height = img_size
+
+    def __iter__(self):
+        self.count = -1
+        return self
+
+    def __next__(self):
+        self.count += 1
+        if cv2.waitKey(1) == 27:  # esc to quit
+            cv2.destroyAllWindows()
+            raise StopIteration
+
+        # Read image
+        ret_val, img0 = self.cam.read()
+        assert ret_val, 'Webcam Error'
+        img_path = 'webcam_%g.jpg' % self.count
+        img0 = cv2.flip(img0, 1)
+
+        # Padded resize
+        img, _, _, _ = letterbox(img0, height=self.height)
+
+        # Normalize RGB
+        img = img[:, :, ::-1].transpose(2, 0, 1)
+        img = np.ascontiguousarray(img, dtype=np.float32)
+        img /= 255.0
+
+        return img_path, img, img0
+
+    def __len__(self):
+        return self.nF  # number of files
+
+
 class LoadImagesAndLabels:  # for training
     def __init__(self, path, batch_size=1, img_size=608, multi_scale=False, augment=False):
         self.path = path