将QImage转化成Mat方法

将QImage转化成Mat方法

def convertQImageToMat(incomingImage):
    '''  Converts a QImage into an opencv MAT format  '''
    # Format_RGB32 = 4,存入格式为B,G,R,A 对应 0,1,2,3
    # RGB32图像每个像素用32比特位表示，占4个字节，
    # R，G，B分量分别用8个bit表示，存储顺序为B，G，R，最后8个字节保留
    incomingImage = incomingImage.convertToFormat(4)
    width = incomingImage.width()
    height = incomingImage.height()

    ptr = incomingImage.bits()
    ptr.setsize(incomingImage.byteCount())
    arr = np.array(ptr).reshape(height, width, 4)  # Copies the data
    # arr为BGRA，4通道图片
    return arr