如何使用斑点检测器检测马里奥硬币？

Question

我尝试使用blob检测器检测mario硬币，但在我的示例代码中，我发现有些硬币没有被检测到，我不知道为什么。我认为硬币可以使用inRange进行预过滤，但我想使用一种通用的方式这样做，所以有人可以帮助我吗？

编码

def onChange(x):
    minThr = cv.getTrackbarPos("minThr", name)
    maxThr = cv.getTrackbarPos("maxThr", name)
    minArea = cv.getTrackbarPos( "minArea", name)
    minCir = cv.getTrackbarPos( "minCir", name)
    
    params.minThreshold = minThr
    params.maxThreshold = maxThr
    
    params.minArea = minArea
    params.minCircularity = minCir/100
    
    
    detector = cv.SimpleBlobDetector_create(params)
    kp = detector.detect(gray)
    img2 = cv.drawKeypoints(img, kp, None, (0,0, 255),flags=cv.DRAW_MATCHES_FLAGS_DRAW_RICH_KEYPOINTS)
    
    cv.imshow(name, img2)

    
name = "cv"
cv.namedWindow(name, cv.WINDOW_NORMAL)
img = cv.imread("./pic/Coin_Snake.png")
gray = cv.cvtColor(img, cv.COLOR_BGR2GRAY)
gray = cv.GaussianBlur(gray, (5, 5), 0)


###
params = cv.SimpleBlobDetector_Params()
params.filterByColor = True
params.blobColor = 255
params.filterByCircularity = True

params.filterByArea = True
params.thresholdStep = 10



cv.createTrackbar("minThr", name, 1, 255, onChange)
cv.createTrackbar("maxThr", name, 1, 255, onChange)

cv.createTrackbar("minArea", name, 1, 300, onChange)
cv.createTrackbar("minCir",  name, 1, 99, onChange)


cv.imshow(name, img)
while True:
    if cv.waitKey(20) & 0xff == 27: break
    
cv.destroyAllWindows()

结果

硬币图片