OpenCV 错误：在 setSize 中断言失败 (s >= 0) - 尝试将图像放置在网络摄像头源上

Question

我试图将帽子的图像叠加在网络摄像头供稿中的头上，而我在以下行中获得错误 -

hat = cv2.resize(imghat, (hatWidth,hatHeight), interpolation = cv2.INTER_AREA)

程序运行，但很快就会退出并给出上述错误。代码段如下 -

# Create the mask for the hat
imghatGray = cv2.cvtColor(imghat, cv2.COLOR_BGR2GRAY)
#cv2.imwrite("imghatGray.png", imghatGray)
ret, orig_mask = cv2.threshold(imghatGray, 0, 255, cv2.THRESH_BINARY)
#cv2.imwrite("orig_mask.png", orig_mask)
# Create the inverted mask for the hat
orig_mask_inv = cv2.bitwise_not(orig_mask)
#cv2.imwrite("orig_mask_inv.png", orig_mask_inv)
# Convert hat image to BGR
# and save the original image size (used later when re-sizing the image)
imghat = imghat[:,:,0:3]
orighatHeight, orighatWidth = imghat.shape[:2]
video_capture = cv2.VideoCapture(0)
while True:
    ret, frame = video_capture.read()
    gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
    faces = face_cascade.detectMultiScale(gray, 1.3, 5, flags=cv2.cv.CV_HAAR_SCALE_IMAGE)
    for (x, y, w, h) in faces:
        cv2.rectangle(frame, (x,y), (x+w, y+h), (255,0,0), 2)
        roi_gray = gray[y:y+h, x:x+w]
        roi_color = frame[y:y+h, x:x+w]
        hatWidth = w
        hatHeight = hatWidth * orighatHeight / orighatWidth
        # Center the hat
        x1 = x -15
        x2 = x + hatWidth + 15
        y1 = y - hatHeight
        y2 = y + 15
        # Check for clipping
        if x1 < 0:
            x1 = 0
        if y1 < 0:
            y1 = 0
        if x2 > w:
            x2 = w
        if y2 > h:
            y2 = h
        cv2.rectangle(frame, (x1,y1), (x2, y2), (0,255,0), 2)
        # Re-calculate the width and height of the hat image
        hatWidth = x2 - x1
        hatHeight = y2 - y1
        # Re-size the original image and the masks to the hat sizes
        # calcualted above
        hat = cv2.resize(imghat, (hatWidth,hatHeight), interpolation = cv2.INTER_AREA)
        mask = cv2.resize(orig_mask, (hatWidth,hatHeight), interpolation = cv2.INTER_AREA)
        mask_inv = cv2.resize(orig_mask_inv, (hatWidth,hatHeight), interpolation = cv2.INTER_AREA)
        # take ROI for hat from background equal to size of hat image
        roi = roi_color[y1:y2, x1:x2]
        # roi_bg contains the original image only where the hat is not
        # in the region that is the size of the hat.
        roi_bg = cv2.bitwise_and(roi,roi,mask = mask_inv)
        # roi_fg contains the image of the hat only where the hat is
        roi_fg = cv2.bitwise_and(hat,hat,mask = mask)
        # join the roi_bg and roi_fg
        dst = cv2.add(roi_bg,roi_fg)
        # place the joined image, saved to dst back over the original image
        roi_color[y1:y2, x1:x2] = dst
        break

这是显示的错误消息 -

v2.err：/home/vinravun/opencv-2.4.10/modules/core/core/src/matrix.cpp:116：error：（-215）s> = 0

Answer 1

没有足够的细节可见，但是似乎您要调整大小的图像之一是空的。

您知道此错误正在发生哪个调整线？

如果您有任何内容，则可能在获取网络摄像头映像后检查。