By doomday on Tag:

พอดีลองรันโค้ด python สำหรับทำ object detection แต่มีส่วนที่ไม่เข้าใจอันนึง คือการกำหนดค่า index เริ่มต้นของ "labelmap" สำหรับฟังค์ชั่น putText (ตรงบรรทัด cv2.putText) ว่าทำไมมันถึงเป็น i-1 เพราะมันจะทำให้ค่าเริ่มต้นของ index เป็น -1 (ทำไมไม่เริ่มจาก 0)

def detect(frame, net, transform):
height, width = frame.shape[:2]
frame_t = transform(frame)[0]
x = torch.from_numpy(frame_t).permute(2, 0, 1)
x = Variable(x.unsqueeze(0))
y = net(x)
detections = y.data
scale = torch.Tensor([width, height, width, height])
# detections = [batch, number of classes, number of occurence, (score, x0, Y0, x1, y1)]

for i in range(detections.size(1)):   
    j = 0   # the occurance
    while detections[0, i, j, 0] >= 0.6:   
        pt = (detections[0, i, j, 1:] * scale).numpy()   
        cv2.rectangle(frame, (int(pt[0]), int(pt[1])), (int(pt[2]), int(pt[3])), (255, 0, 0), 2)   
        cv2.putText(frame, labelmap[i - 1], (int(pt[0]), int(pt[1])), cv2.FONT_HERSHEY_SIMPLEX, 2, (255, 255, 255), 2, cv2.LINE_AA)
        j += 1
return frame 

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khao_lek Tue, 28/11/2017 - 16:51

ปกติตัว labelmap จะต้องมีค่ามาก่อน มาดื่อๆ แบบนี้น่าจะเออเร่อ เช่น labelmap= "ABCDE"
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