Abstract: A detection system includes an imaging unit configured to acquire in advance a first distance image indicating a background and acquire a second distance image including at least the background and a target object, and a processing unit configured to calculate a first virtual volume indicating the background from the first distance image, calculate a second virtual volume indicating the target object from the second distance image, and compare the first virtual volume with the second virtual volume to detect the target object.

Abstract: A detection system includes an imaging unit configured to acquire a distance image indicating a distance to a target object, and a processing unit configured to divide pixels included in the distance image into blocks according to a distance relationship, and detects a state of the target object by comparing ratios of pixels included in the respective blocks.

Abstract: In the adhesive spacers which are synthesized as by the impact method in a high-speed air current, resin particles formed solely of an adhesive layer are included in a large amount besides those of adhesive spacers. An adhesive particulate composition is obtained by adjusting these resin particles in terms of grain size. The adhesive particulate composition containing (a) adhesive particles having a thermoplastic resin-containing layer cover at least part of the surfaces of the core particles having an average particle diameter in the range of 1 to 20 .mu.m and a coefficient of variation of not more than 10% and (b) adhesive layer particles formed of the thermoplastic resin and having a ratio of the number of (b) the adhesive layer particles to that of (a) the adhesive particles of not more than 30%, adhesive spacers for a liquid crystal display panel formed of the composition, and the liquid crystal display panel using the spacers are disclosed.