Abstract: A chromaticity measurement method and device for calibration of a tiled LED display screen (A) having the advantages of convenience in operation and accurate measurement. The chromaticity measurement method includes: imaging emergent light from the tiled LED display screen (A) with an objective lens (1); receiving a light beam from the objective lens (1) with a transflective lens (2) and performing beam splitting to obtain a first light beam and a second light beam; receiving the first light beam with an imaging sensor (3) to obtain an original image; receiving the second light beam in a two-dimensional lattice form with a movable optical fiber array coupling device (4), and converting the second light beam into one-dimensional lattice light; and obtaining chromaticity information and spectrum information of a plurality of regions on the tiled LED display screen (A) according to the one-dimensional lattice light with a spectrum acquisition device (5).

Abstract: A collaborative distance metric leaning method and apparatus for visual tracking utilizes a distance metric to match the target with the best candidate. A collaborative distance metric learning algorithm is used for visual tracking by fusing two distance metrics learnt for different representations of the target. To further improve the performance of the trained distance metrics, a sample selection mechanism is also used that exploits the intrinsic structure of dense sampling.