Embodiments of the invention disclose devices, methods, and computer media for noise rejections in a remote sensing device, such as a LIDAR device. In an exemplary embodiment, a spatial filter includes an aperture dynamically created in synchronization with one or more directions in which emitted laser pulses from the LiDAR device are steered. Photons from all other directions except the one or more directions are blocked by the spatial filter. Reflected photons from the one or more directions pass through the spatial filter via the aperture, and are projected on one or more sets of photodetectors. Noises in the photons that pass through the spatial filter are further to be rejected based on one or more fixed temporal patterns identified in laser pulses emitted by the LiDAR device. The spatial filter can be implemented using an electrochromic display, an array of micromechanical (MEMS) mirrors, a liquid crystal display (LCD), or an electro-wetting display.