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from __future__ import division
import torch
import random
import numpy as np
import cv2
def confidence_filter(result, confidence):
conf_mask = (result[:,:,4] > confidence).float().unsqueeze(2)
result = result*conf_mask
return result
def confidence_filter_cls(result, confidence):
max_scores = torch.max(result[:,:,5:25], 2)[0]
res = torch.cat((result, max_scores),2)
print(res.shape)
cond_1 = (res[:,:,4] > confidence).float()
cond_2 = (res[:,:,25] > 0.995).float()
conf = cond_1 + cond_2
conf = torch.clamp(conf, 0.0, 1.0)
conf = conf.unsqueeze(2)
result = result*conf
return result
def get_abs_coord(box):
box[2], box[3] = abs(box[2]), abs(box[3])
x1 = (box[0] - box[2]/2) - 1
y1 = (box[1] - box[3]/2) - 1
x2 = (box[0] + box[2]/2) - 1
y2 = (box[1] + box[3]/2) - 1
return x1, y1, x2, y2
def sanity_fix(box):
if (box[0] > box[2]):
box[0], box[2] = box[2], box[0]
if (box[1] > box[3]):
box[1], box[3] = box[3], box[1]
return box
def bbox_iou(box1, box2):
"""
Returns the IoU of two bounding boxes
"""
# Get the coordinates of bounding boxes
b1_x1, b1_y1, b1_x2, b1_y2 = box1[:, 0], box1[:, 1], box1[:, 2], box1[:, 3]
b2_x1, b2_y1, b2_x2, b2_y2 = box2[:, 0], box2[:, 1], box2[:, 2], box2[:, 3]
# get the corrdinates of the intersection rectangle
inter_rect_x1 = torch.max(b1_x1, b2_x1)
inter_rect_y1 = torch.max(b1_y1, b2_y1)
inter_rect_x2 = torch.min(b1_x2, b2_x2)
inter_rect_y2 = torch.min(b1_y2, b2_y2)
# Intersection area
if torch.cuda.is_available():
inter_area = torch.max(inter_rect_x2 - inter_rect_x1 + 1, torch.zeros(inter_rect_x2.shape).cuda())*torch.max(inter_rect_y2 - inter_rect_y1 + 1, torch.zeros(inter_rect_x2.shape).cuda())
else:
inter_area = torch.max(inter_rect_x2 - inter_rect_x1 + 1, torch.zeros(inter_rect_x2.shape))*torch.max(inter_rect_y2 - inter_rect_y1 + 1, torch.zeros(inter_rect_x2.shape))
# Union Area
b1_area = (b1_x2 - b1_x1 + 1)*(b1_y2 - b1_y1 + 1)
b2_area = (b2_x2 - b2_x1 + 1)*(b2_y2 - b2_y1 + 1)
iou = inter_area / (b1_area + b2_area - inter_area)
return iou
def pred_corner_coord(prediction):
#Get indices of non-zero confidence bboxes
ind_nz = torch.nonzero(prediction[:,:,4]).transpose(0,1).contiguous()
box = prediction[ind_nz[0], ind_nz[1]]
box_a = box.new(box.shape)
box_a[:,0] = (box[:,0] - box[:,2]/2)
box_a[:,1] = (box[:,1] - box[:,3]/2)
box_a[:,2] = (box[:,0] + box[:,2]/2)
box_a[:,3] = (box[:,1] + box[:,3]/2)
box[:,:4] = box_a[:,:4]
prediction[ind_nz[0], ind_nz[1]] = box
return prediction
def write(x, batches, results, colors, classes):
c1 = tuple(x[1:3].int())
c2 = tuple(x[3:5].int())
img = results[int(x[0])]
cls = int(x[-1])
label = "{0}".format(classes[cls])
color = random.choice(colors)
cv2.rectangle(img, c1, c2,color, 1)
t_size = cv2.getTextSize(label, cv2.FONT_HERSHEY_PLAIN, 1 , 1)[0]
c2 = c1[0] + t_size[0] + 3, c1[1] + t_size[1] + 4
cv2.rectangle(img, c1, c2,color, -1)
cv2.putText(img, label, (c1[0], c1[1] + t_size[1] + 4), cv2.FONT_HERSHEY_PLAIN, 1, [225,255,255], 1);
return img
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