159 results about "Film speed" patented technology

An x-ray diagnostic apparatus and methods performs Real-Time Digital Radiography with particular application in dental x-ray imaging modalities, such as Orthopantomography, Scannography, Linear Tomography and Cephalography, by using a versatile and modular electronic unit, featuring ultra fast computation capability to serve diversified image sensor typology and scanning modality. In Digital Orthopantomography and Scannography, a plurality of tomographic images at different depths of the jaw can be generated, based on the pre-selection made by the user interface. The image processing unit utilizes for the tomo-synthesis of the diagnostic image an accurate and economic digital simulator of the radiographic film speed, including a digital frequency synthesizer fed with film cassette speed digital input and high resolution clock signal, ensuring accurate and reproducible phase continuity of the output frequency signal. It also introduces an automatic adaptation of the frame acquisition rate in frame transfer mode, based on the actual speed of the cassette unit. By this method the dynamic of the exposure signal is reduced, and a better optimization of the signal response of the x-ray detector is achieved.

The invention provides an imaging method and device based on double cameras. The imaging method comprises the steps of: after determining environmental brightness, determining a main camera and an auxiliary camera from double cameras according to the environmental brightness, furthermore, shooting a first shot image by adopting the main camera, shooting a second shot image by adopting the auxiliary camera, generating an imaging image according to the first shot image, furthermore, calculating depth information of the imaging image according to the first shot image and the second shot image, and thus, blurring the imaging image according to the depth information of the imaging image, so that a required target image is obtained. The high-resolution camera is used as the first camera; the high-sensitivity camera is used as the second camera; furthermore, switching of the main and auxiliary cameras on the first camera and the second camera is carried out according to the environmental brightness; therefore, performances of the main and auxiliary cameras can be matched with the current environmental brightness; the imaging effect is ensured; and thus, the technical problem that the imaging effect of the double cameras in a dark light environment is relatively poor in the prior art can be solved.