An external flash comprising a light source assembly, a driving circuit, a first communication circuit and a color correction processing circuit, wherein the light source assembly comprises one or more LED light sources; the driving circuit is used for driving the light source assembly to emit light; the first communication circuit is used for communicating with a terminal device, so as to receive a color correction control instruction sent by the terminal device; the color correction processing circuit is connected to the driving circuit and is electrically connected to the first communication circuit; the color correction processing circuit receives the color correction control instruction transmitted by the first communication circuit, and performs color correction processing on light-emission information of the light source assembly to generate color correction result information; and the driving circuit drives, according to the color correction result information, the light source assembly to emit light.

A color correction device comprises a light-emission information collection circuit, a first communication circuit and a color correction processing circuit, wherein the light-emission information collection circuit is used for collecting light-emission information of an external flash; the first communication circuit is used for communicating with a terminal device, so as to receive a color correction control instruction sent by the terminal device; the color correction processing circuit receives the color correction control instruction transmitted by the first communication circuit and then performs color correction processing on the basis of the light-emission information to generate color correction result information; and the color correction result information is used for being transmitted to the external flash so as to correct light-emission of the external flash. The color correction device can be used for color correction of the external flash.

A light field imaging device and method are provided. The device can include a diffraction grating assembly receiving a wavefront from a scene and including one or more diffraction gratings, each having a grating period along a grating axis and diffracting the wavefront to generate a diffracted wavefront. The device can also include a pixel array disposed under the diffraction grating assembly and detecting the diffracted wavefront in a near-field diffraction regime to provide light field image data about the scene. The pixel array has a pixel pitch along the grating axis that is smaller than the grating period. The device can further include a color filter array disposed over the pixel array to spatio-chromatically sample the diffracted wavefront prior to detection by the pixel array. The device and method can be implemented in backside-illuminated sensor architectures. Diffraction grating assemblies for use in the device and method are also disclosed.

A light field imaging device and method are provided. The device can include a diffraction grating assembly receiving a wavefront from a scene and including one or more diffraction gratings, each having a grating period along a grating axis and diffracting the wavefront to generate a diffracted wavefront. The device can also include a pixel array disposed under the diffraction grating assembly and detecting the diffracted wavefront in a near-field diffraction regime to provide light field image data about the scene. The pixel array has a pixel pitch along the grating axis that is smaller than the grating period. The device can further include a color filter array disposed over the pixel array to spatio-chromatically sample the diffracted wavefront prior to detection by the pixel array. The device and method can be implemented in backside-illuminated sensor architectures. Diffraction grating assemblies for use in the device and method are also disclosed.