Abstract: A system for external fish parasites monitoring in aquaculture, the system comprising: —a camera (52) suitable to be submerged in a sea pen suitable for containing comprising fish, the camera being arranged for capturing images of the fish; and—an electronic image processing system (86) configured for identifying external fish parasites on the fish by analyzing the captured images, wherein: —a ranging detector (54) configured for detecting the presence of fish and measuring a distance from the detector to the fish is mounted adjacent to the camera (52); and—an electronic control system (12) is arranged to control a focus of the camera (52) on the basis of the measured distance and to trigger the camera (52) when a fish has been detected within a predetermined distance range.

Abstract: The present disclosure relates to a ranging method and a ranging system, the ranging method includes using a first laser emitting portion of a laser emitting device to emit a vertical laser beam rotating in a vertical plane at a first rotation speed; calculating a time difference between the vertical laser beam passing through a first optical detection component and a second optical detection component by using the first optical detection component and the second optical detection component on a laser receiving device at least partially on the same vertical plane, wherein a distance between the two optical detection components is a first spacing; and calculating a first distance between the laser emitting device and the laser receiving device based on the first rotation speed, the first spacing, and the time difference.

Abstract: An image acquisition unit for obtaining data to generate at least one three-dimensional representation of at least one underwater structure is disclosed. The image acquisition unit includes a unit body, a plurality of cameras, a first laser light device, and a second laser light device. The first laser light device can operate based on a first illumination setting. The second laser light device can operate based a second illumination setting. The first and second cameras can be configured to capture light during the first illumination setting and generate a first set of data representative of the first laser projecting on the at least one underwater structure at a predetermined scan rate. The third and fourth cameras can be configured to capture light during the second illumination setting and generate a second set of data representative of the second laser projecting on the at least one underwater structure at the predetermined scan rate.

Abstract: An apparatus for observing the optical appearance of a surface (2) of a sample (1) of semitransparent material, in particular the surface (2) of a human skin, the apparatus comprising a light source (11,12,13,16,17) for illuminating at least a region of interest of the surface (2) of the sample (1) from a predetermined direction, a camera (14) for observing a response to the illumination of the region of interest and an optical focus device (21,31) for determining if the camera (14) is in focus with the surface (2) of the region of interest. The invention also relates to a method for observing the optical appearance of the surface (2) of a sample (1) of semitransparent material, in particular the surface (2) of a human skin.

Abstract: An image capture system is provided. The image capture system for capturing an image of an object includes a light emitting module, a lens, a base unit and a filter unit. The light emitting module provides a plurality of light beams to form a reference area. The base unit includes a light sensor corresponding to the lens. The filter unit includes at least one visible light passing portion and at least one invisible light passing portion. The filter unit is driven to position one of the visible light passing portion and the invisible light passing portion between the lens and the light sensor. The actual size of the object can be estimated via the reference area.

Abstract: A microscope for focusing by inserting a split prism at a focusing support time. The image of an iris stop is branched into such two images by the angle deflecting action of the split prism as are individually shifted and focused at symmetric positions across the optical axis of the microscope. These two branched images of the iris stop are further focused on an objective lens through a beam splitter by the focusing action of a lens. The operation unit of a vertical motion device is operated to move an optical system up and down so that the images of a focused pattern are viewed to move in opposite directions from each other in the field of view.

Abstract: A lens module includes a frame, a guide bar, a lever, a first lens and a second lens. The frame is for carrying an image sensor with a photosensitive surface. The guide bar is disposed on one side of the frame and parallel to a normal of the photosensitive surface. The lever includes a pivot part coupled with the frame and an extended part capable of rotating around the pivot part. The first lens and the second lens coupled with the guide bar are leaned against the extended part. When the extended part rotates around the pivot part, the extended part drives the first lens and the second lens to slide along the guide bar, for changing a first distance between the first lens and the photosensitive surface and changing a second distance between the second lens and the photosensitive surface.

Abstract: A focus sensor for detecting the focus state of an image forming optical system relative to an object, the optical system having a plane of best imaging focus, includes: a plurality of image detectors located at a corresponding plurality of positions relative to the plane of best imaging focus for producing a respective plurality of image signals; and a signal processor connected to the image detectors for determining a position of best focus by calculating the covariances between respective pairs of the image signals.

Abstract: A reproduced signal processing apparatus for optically reproducing and demodulating modulated data recorded on an optical information recording media, comprises means for integrating the optically reproduced signal for each predetermined section, comparing the integrations of adjacent sections and amplifying or attenuating a portion of the unintegrated reproduced signal corresponding to the predetermined section in accordance with the comparison result.