A concrete reinforcing bar support having a base, a support structure extending upwardly from the base and having a channel formed at an upper surface thereof, a first clamping structure affixed to the support structure on one side of the channel, and a second clamping structure affixed to the support structure on an opposite side of the channel. The attribute determining method of the present invention comprises: an image acquiring step of acquiring an image to be determined; a head region detecting step of detecting a head region from the image to be determined; and an attribute determining step of determining an attribute based on an image of the head. Different topologies are then compared in order to select the most likely topology at the prevailing time. A ball stud member includes a threaded shaft extending in one direction and a post extending in an opposing direction. The negative pressure is preferably established in a pulse-like manner to rupture the membrane in such a way that the cell interior enclosed by the membrane is connected to the channel.