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.

A color imaging apparatus includes a CCD imaging device having interline transfer charge transfer paths adapted for interlaced reading and a Bayer-arranged color filter. The apparatus can be put in either of normal shooting mode and high-sensitivity shooting mode. In the high-sensitivity mode, pixel signals from two pixels arranged in the vertical direction in each photosensitive CCD array are transferred by a corresponding vertical transfer path at two times the rate in the normal mode to a horizontal transfer path where they are added together. A line of pixel signals from the horizontal transfer path is output to a preprocess circuit where pixel signals separated by one pixel in the horizontal direction are added together. This process produces a line of image signal.

The present invention provides a camera module night scene camera processing method and device, an electronic device and a storage medium, belong to that field of imaging technology. The method comprises the following steps: detecting the current jitter degree of the image pickup module in the night scene shooting mode; determining the number of images to be captured and the reference sensitivitycorresponding to each frame of images to be captured according to the current jitter degree of the image capturing module; according to the illuminance of the current shooting scene and the referencesensitivity corresponding to each frame of the image to be captured, determining the exposure time corresponding to each frame of the image to be captured; according to the corresponding reference sensitivity and exposure time of each frame of the image to be collected, sequentially collecting and synthesizing multiple frames of images to generate target images. Thus, the method not only improvesthe dynamic range and overall brightness of the night scene image pickup, effectively suppresses noise in the image, but also suppresses ghost shadow caused by handheld shake, improves the quality ofthe night scene image pickup, and improves the user experience.

A system wherein already-existing computing and memory resources in an electronic camera are used to process an image for printing. Rather than duplicating, in printers, computing and memory resources that are already in digital cameras, significant computing and memory resources need exist only in the camera. A digital camera can support many different printers, each with its own set of parameters such as for example print size, pixel size, colorimetry, sensitometry, and artifacts compensation. Printer parameters are uploaded from the printer to the camera to provide a basis for image processing specific to the associated printer; whereby compensation may be done for variations in the printer characteristics which may occur as a result of printer manufacturing variations, and further so that compensation may be done for different media types which may be installed in the printer.

The invention relates to a photograph control method and a device thereof. Auto light-receiving environmental data are obtained by a photographing element, initial shutter exposure time and initial photosensitivity are calculated according to the environmental data, and judgement is performed according to a special mode. In the special mode, such as the initial shutter exposure time is shorter than or equal to the preset special time, images are photographed according to the initial shutter exposure time and the initial photosensitivity. If the initial shutter exposure time is longer than the preset special time, images are photographed with the final shutter exposure time and the final photosensitivity according to the preset special rules.

The invention discloses a measurement method of volumes of goods. The method comprises following steps of using a two-dimensional laser scanner to acquire profile angles and distance information of a loaded vehicle and an empty vehicle; determining running direction and position information of the vehicles; carrying out reconstruction processing on the profile angles and distance information of the loaded vehicle and the empty vehicle, angle echo information and the running direction and position information of the vehicles; by use of the point cloud filtering method, processing the acquired cloud point data of the loaded vehicle and the empty vehicle, and extracting three-dimensional point cloud data of a goods carriage; and based on the calculus algorithm, by use of a method for constructing a triangular plane, processing points in the point cloud data of the loaded vehicle and the empty vehicle, ad obtaining the volume information of the loaded vehicle and the empty vehicle. According to the invention, the measurement method is free from harmful effects caused by the resolution, the film speed, the distortion of a lens, the installation position and the environmental factors of a front end image acquisition device; the acquired data serves as the direct measurement data; and the measurement method is advantaged by high result accuracy, timeliness, objectiveness and vividness, and is worthy of promotion.

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.

The invention provides an exposure control method and device, electronic equipment and a computer-readable storage medium. The method comprises the following steps: determining target exposure of theto-be-acquired image of each frame through photometry; according to the target exposure of the to-be-acquired image of each frame and the preset light sensitivity of the to-be-acquired image of each frame, determining the exposure duration of the to-be-acquired image of each frame; if the exposure duration of the to-be-acquired image of one or more frame is less than the lower limit of duration, updating the exposure duration of the to-be-acquired image of one or more frame according to the lower limit of duration; finally, performing exposure control according to the exposure duration and light sensitivity of the to-be-acquired image of each frame. Therefore, the dynamic range and overall brightness of night scene shot images are improved, and noise in the images is inhibited; moreover, ghost and fuzziness caused by hand shake are inhibited, the quality of the night scene shot images is improved, and the user experience is improved.

Low-sensitivity image data and high-sensitivity image data are synthesized at a ratio determined by a dynamic range. A composite image is displayed on a display screen. A histogram of the composite image is generated, and is displayed on the display screen. A user presses a dynamic range change button when he or she considers that the dynamic range of the composite image must be changed by seeing the histogram and the composite image. The dynamic range is changed, to obtain a composite image by the synthesis at the ratio determined by the changed dynamic range. It can be judged by the histogram whether or not the dynamic range must be changed.

Acquired video signals are forwarded to pre-processing block (103) for sampling, gain amplification and A/D conversion, and then forwarded to image buffer (104). Video signals in image buffer (104) are forwarded to noise estimation block (106). On the basis of taking conditions, video signals and a reference noise model, noise estimation block (106) works out the quantity of noise per ISO sensitivity, and per color signal. The calculated noise quantity is forwarded to noise reduction block (105). On the basis of the noise quantity estimated at the noise estimation block (106), the noise reduction block (105) applies noise reduction processing to video signals in image buffer (104), and video signals after noise reduction processing are forwarded to signal processing block (108).

Suppression of a flicker and appreciated AF accuracy are both taken into account in a program diagram for AF for determining shooting conditions for capturing an image for executing an auto-focus detection process in a moving image/still image continuous shooting mode for recording a still image and moving images of a predetermined period just before the still image capturing. Specifically, in a sector of low luminance in which ISO sensitivity is not a minimum value, a shutter speed that can suppress the flicker is set, and then the ISO sensitivity is reduced to the minimum value to allow obtaining a moving image with the suppression of the flicker.

The embodiment of the invention discloses a camera exposure processing method and device and an intelligent terminal, and the method comprises the steps: detecting the brightness of a current environment through a brightness sensor, and obtaining the brightness value of the current environment; obtaining the grade of the current actual environment according to the obtained brightness value of thecurrent environment; when the grade of the current actual environment is a preset environment darkness grade, controlling to search an exposure coefficient sensitivity gain table corresponding to theenvironment darkness grade, and confirming a corresponding exposure parameter; and dynamically adjusting exposure according to the exposure parameters of the lookup table, and controlling to output anexposure picture with corresponding brightness. According to the invention, the current environment state is correctly judged by adding judgment on the brightness of the environment light, and then the current environment state enters the low-illumination exposure system to carry out more appropriate exposure control, so that the brightness in a picture is appropriate under the condition of low illumination, such as weak light or light turn-off; therefore, a user can see a picture with proper brightness under the condition of weak light or light turn-off.

The embodiment of the invention provides a photographing method and device, a storage medium and a terminal. The method comprises: when an ambient brightness value is less than a preset threshold, a light sensitivity value of a camera is determined according to the ambient brightness value; a plurality of frames of images shot by the camera on the light sensitivity condition are obtained; at least two frames of images are selected from the plurality of frames of images to carry out synthesis, thereby obtaining a first image; and according to a preset adjusting parameter, the brightness of the first image is adjusted, so that a second image is obtained. According to the invention, when the terminal is in a dark environment, the light sensitivity value is determined based on the ambient brightness value, so that noisy points in a image can be reduced wile image shooting is carried out; after the synthesis of the shot images, the brightness of the first image is adjusted to enhance the brightness of the first image, so that the image brightness can be guaranteed and the noisy points in the image can be reduced and thus the image quality can be improved.

The embodiment of the invention relates to the field of electronic technology, and discloses an image processing method and a mobile terminal. The method comprises steps: when a brightness value of the current environment is detected to be smaller than a preset brightness threshold, the mobile terminal increases current sensitivity of a camera to target sensitivity, the camera is controlled to use the target sensitivity to carry out image acquisition on a shooting object in a preset shooting view angle, a first image is obtained, saturation of the first image is reduced, a second image is thus obtained, and the second image is outputted on an image preview interface. Through the embodiment of the invention, the mobile terminal automatically increases the sensitivity of the camera in a dark environment, when the increased sensitivity is used for acquiring the image, brightness of color noise points in the image is reduced through reducing the saturation of the image, the color noise points can be effectively reduced, the image is more distinct, and visibility of the image is enhanced.

The invention discloses a method for regulating the light sensitivity of a digital camera. The method comprises the following steps of: acquiring a live view image corresponding to a plurality of suitable targets by utilizing a shooting module; causing a flash lamp to emit preflash, and acquiring a preflah image corresponding to the suitable targets by utilizing the shooting module; calculating a reflected image according to the live view image and the preflash image; judging the presentation positions of the suitable targets in the preflash image by using the reflection information of each position on the reflected image; executing an identification program for the presentation positions to find image information presenting the suitable targets from the preflash image; judging whether the suitable targets belong to more than two depths of field or not according to the image information of the suitable targets; and when the suitable targets belong to more than two depths of field, regulating the current light sensitivity of the shooting module. By the method, relative distances among the suitable targets are judged as references by the images acquired before and after the pre-flashing of the flash lamp, and a relatively better image is acquired in the supplementary lighting state of the flash lamp.