Abstract: Embodiments of the present disclosure relate to a zooming projection method and a projector. The projector includes a focusing device and a lens movable along an optical axis. The method includes: acquiring a projection distance between the projector and a projection position; adjusting the lens to a target position for projection by the focusing device in response to the projection distance being within an optical zooming range; and scaling a projection image and projecting the scaled projection image in response to the projection distance being not within the optical zooming range.

Abstract: The present application discloses a dynamic projection method for target tracking and a dynamic projection device. A dynamic projection method for target tracking includes: acquiring position information of a target; determining three-dimensional spatial coordinates of the target in a first coordinate system based on the position information of the target; determining three-dimensional spatial coordinates of the target in a second coordinate system based on the three-dimensional spatial coordinates of the target in the first coordinate system; determining a deflection angle of a projection screen based on the three-dimensional spatial coordinates of the target in the second coordinate system; determining a rotation angle of a dynamic control unit based on the deflection angle; controlling the dynamic control unit to rotate by the rotation angle; and controlling a projecting unit to project the projection screen. In this way, dynamic projection for target tracking is implemented.

Abstract: Embodiments of the present disclosure relate to a projection method based on augmented reality technology, and a projection equipment (10). In the projection method applicable to the projection equipment (10) includes, the image information of a real space (20) is captured in advance, the 3D virtual spatial model is constructed based on the image information, the optimal projection region is determined based on the 3D virtual spatial model, and a projection target (30) is projected to the optimal projection region. In this way, seamless integration of information about real world and virtual world is achieved, a user does not need to wear a complicated wearable equipment, and user experience is improved.

Abstract: The present disclosure relates to the technical field of digital projection display, and discloses a projection method and a projection apparatus. The method includes: acquiring a target object image; identifying attribute information of a target object based on the target object image; acquiring preset projection content based on the attribute information of the target object; acquiring a projection path; and projecting a projection screen based on the preset projection content and controlling the projection screen to move along the projection path. In this way, the projection is more flexible and more pertinent.

Abstract: The embodiments of the present disclosure, relating the technical field of projection display, provide a projection apparatus. A projection apparatus includes a projection unit, configured to project a projection image; a support frame, one end of the support frame being fixed to the projection unit; a regulation unit, suspended at the other end of the support frame; and a reflection unit, fixed to the regulation unit, and configured to reflect the projection image. A reflection direction of the reflection unit is regulated by regulating a rotation angle of the reflection unit, such that the reflection unit reflects the projection image to a target projection position.

Abstract: A medium for culturing Balantidium ctenopharyngodoni in vitro, method for preparing the medium and method for culture in vitro are provided, which belongs to technical field of in vitro culture of intestinal protozoa. The formulation of the culture medium includes: 100 ml of Ringer's solution, 0.5 g of yeast extract, 1.0 g of proteose peptone, 3-6 ml of fetal bovine serum, 6-10 ml of horse serum, 300-500 ?l of Bacillus licheniformis suspension, 200-300 mg of aseptic starch. Culture steps include: inoculating collected Balantidium ctenopharyngodoni into a prepared medium, filling with nitrogen and sealing, culturing at 15° C. for 48-72 hours, then transferring to another fresh medium, cycling back and forth, proliferating the Balantidium ctenopharyngodoni continuously. Balantidium ctenopharyngodoni are capable of achieving cell division and proliferation in the culture medium, and lays foundation for the physiological and experimental ecology research of the Balantidium ctenopharyngodoni.

Abstract: Embodiments of the disclosure provide a method for wall surface calibration, a method for edge calibration, a calibration apparatus, and a computer program product. The method for wall surface calibration comprises: acquiring a first rotation parameter and a second rotation parameter when a center of a projection picture of the calibration apparatus directly faces two boundary points on a top edge of the wall surface respectively; acquiring a third rotation parameter and a fourth rotation parameter when the center of the projection picture of the calibration apparatus directly faces two boundary points on a bottom edge of the wall surface respectively; and determining a surface calibration parameter of the wall surface relative to the calibration apparatus according to the first edge calibration parameter, the second edge calibration parameter, the first rotation parameter, the second rotation parameter, the third rotation parameter and the fourth rotation parameter.

Abstract: Embodiments of the present disclosure propose a method for controlling projection of a projection module, a projection system and a storage medium. The method for controlling projection of the projection module includes: obtaining a projection environment where the projection module is located, and determining a position of a target person according to the projection environment; and planning the best projection position in the projection environment according to the projection environment and the position of the target person. The best projection position in the projection environment is planned according to the position of the target person, so that the projection picture projected by the projection module can be adaptively changed along the position of the target person to fit with the current status of the target person to improve the perception experience of the user.

Abstract: Embodiments of the present disclosure relate to the technical field of digital projection display, and disclose a dynamic projection device, a dynamic projection method, and a projector. The device includes: a projection unit configured to output a projection picture according to a projection image; a reflection unit configured to reflect the projection picture to a target projection position; an angle calculation unit connected with the reflection unit and configured to calculate a rotation angle of the reflection unit; and an image correction unit connected with the angle calculation unit and the projection unit, respectively, and configured to correct the projection image according to the rotation angle. The present disclosure adjusts the projection direction by controlling the reflection unit with simple structure and light weight, realizing convenient direction control and high-quality projection display, and covering a wide area of the projection environment.

Abstract: A medium for culturing Balantidium ctenopharyngodoni in vitro, method for preparing the medium and method for culture in vitro are provided, which belongs to technical field of in vitro culture of intestinal protozoa. The formulation of the culture medium includes: 100 ml of Ringer's solution, 0.5 g of yeast extract, 1.0 g of proteose peptone, 3-6 ml of fetal bovine serum, 6-10 ml of horse serum, 300-500 ?l of Bacillus licheniformis suspension, 200-300 mg of aseptic starch. Culture steps include: inoculating collected Balantidium ctenopharyngodoni into a prepared medium, filling with nitrogen and sealing, culturing at 15° C. for 48-72 hours, then transferring to another fresh medium, cycling back and forth, proliferating the Balantidium ctenopharyngodoni continuously. Balantidium ctenopharyngodoni are capable of achieving cell division and proliferation in the culture medium, and lays foundation for the physiological and experimental ecology research of the Balantidium ctenopharyngodoni.