Aspects of present disclosure relates to a dynamic videotelephony system. In certain embodiments, dynamic videotelephony system includes a first dynamic videotelephony device for a first user group, and a second dynamic videotelephony device for a second user group, and a network connecting these two dynamic videotelephony devices for a dynamic video conference between the two user groups. Each of the dynamic videotelephony devices has a gaze detection device group to detect a corresponding principal location of pupils of a corresponding user group, and sends control instructions to the opposite dynamic videotelephony device to control dynamic video capturing such that the captured dynamic video is focused and centered at an object corresponding to the corresponding principal location of pupils of the corresponding user group on the corresponding dynamic video display device, and the captured dynamic video is transmitted from the opposite dynamic videotelephony device to corresponding dynamic videotelephony device for display.

A method for determining whether or not a transparent protective cover of a video camera comprising a lens-based optical imaging system is partly covered by a foreign object is disclosed. The method comprises: obtaining (402) a first captured image frame captured by the video camera with a first depth of field; obtaining (404) a second captured image frame captured by the video camera with a second depth of field which differs from the first depth of field; and determining (406) whether or not the protective cover is partly covered by the foreign object by analysing whether or not the first and second captured image frames are affected by presence of the foreign object on the protective cover such that the difference between the first depth of field and the second depth of field results in a difference in a luminance pattern of corresponding pixels of a first image frame and a second image frame. The first image frame is based on the first captured image frame and the second image frame is based on the second captured image frame.

A method for determining whether or not a transparent protective cover of a video camera comprising a lens-based optical imaging system is partly covered by a foreign object is disclosed. The method comprises: obtaining (402) a first captured image frame captured by the video camera with a first depth of field; obtaining (404) a second captured image frame captured by the video camera with a second depth of field which differs from the first depth of field; and determining (406) whether or not the protective cover is partly covered by the foreign object by analysing whether or not the first and second captured image frames are affected by presence of the foreign object on the protective cover such that the difference between the first depth of field and the second depth of field results in a difference in a luminance pattern of corresponding pixels of a first image frame and a second image frame. The first image frame is based on the first captured image frame and the second image frame is based on the second captured image frame.

Image processing device is image processing device that uses a plurality of images respectively having focusing positions different from each other to calculate distance information to a subject, and includes frequency converter, amplitude extractor, and distance information calculator. Frequency converter converts the plurality of images into frequency. Amplitude extractor extracts an amplitude component out of a phase component and the amplitude component of a coefficient obtained by converting the plurality of images into frequency. Distance information calculator calculates the distance information, by using lens blur data and only the amplitude component extracted by amplitude extractor out of the phase component and the amplitude component of the coefficient.

A control device includes a processor and a storage medium storing a program that, when executed by the processor, causes the processor to obtain a reference distance of a photographing device that includes a height of the photographing device or a distance from the photographing device to a target object, determine a range of a focus distance of the photographing device according to the reference distance, and control the photographing device to shoot a plurality of images while changing the focus distance within the range.

A system and method for constructing a digital composite image of a three-dimensional biological sample. The system includes an optical system that captures images of cells and tissue presented on a specimen slide. The system systematically acquires a stack of images at different segments across the specimen slide. For each segment, the system dynamically calculates an optimal focal plane. Once an optimal focal plane is determined for each of the stacks of images, the system generates a composite image by copying the sharpest objects from each of the optimal focal planes.

The present disclosure relates to a focus tracking system and method. The system comprises: a primary camera comprising a first focus adjustable lens and a first focus adjusting servo motor driving the first focus adjustable lens to perform focus adjusting; a secondary camera comprising a second focus adjustable lens and a second focus adjusting servo motor driving the second focus adjustable lens to perform focus adjusting, coded aperture is installed inside the second focus adjustable lens, the secondary and primary camera have equivalent optical parameters; a synchronization system performing frame level synchronization between images of the primary and secondary camera to obtain frame-level synchronized primary and secondary camera images; a focus control system calculating out-of-focus offset utilizing coded patterns of the coded aperture and out-of-focus images in the frame-level synchronized secondary camera images, sending focus adjusting signals to the first and second focus adjusting servo motor based on the out-of-focus offset.

A lens main body includes an inner housing, a lens element mounted on the inner housing, an adjustable functional element mounted on the inner housing, and an electrical drive arranged on the inner housing to adjust the functional element, a controller arranged on the inner housing, a securing device configured to reversibly receive an outer housing extending around the inner housing in a tubular fashion, and a first signal interface to receive control signals for the controller, arranged on the inner housing, and configured to reversibly couple to a mating interface of the outer housing. An outer housing for the lens main body, and a lens formed from the lens main body and the outer housing have an altered functional scope vis-à-vis the lens main body. In addition, a lens assembly includes, besides the lens main body, two outer housings having a different functional scope.

A method and apparatus for differentiating focus drift of an imaging system from position changes of an object of interest. The method includes obtaining an image of an object of interest and identifying a region of interest in the image, wherein the region of interest contains an indicia indicative of the object of interest. The processor determines an image quality of the image and analyzes the indicia and determines a pixel measurement of the indicia. The processor then compares the pixel measurement of the indicia to a reference pixel measurement. Based on the comparison, the processor determines that the image quality of the image results either from a difference in a distance of the object from the imaging system or from focusing drift of the imaging system.

The present disclosure generally relates to user interfaces for altering visual media. In some embodiments, user interfaces capturing visual media (e.g., via a synthetic depth-of-field effect), playing back visual media (e.g., via a synthetic depth-of-field effect), editing visual media (e.g., that has a synthetic depth-of-field effect applied), and/or managing media capture.