The technical scheme of the invention discloses an exposure control method and device. The exposure control method comprises the following steps: calculating an average brightness of a scene; performing scene recognition according to scene illumination evaluation, a histogram light region ratio and a histogram dark region ratio, so as to obtain a target brightness value of an adaptive scene; and adjusting parameters of an image sensor according to the average brightness of the scene and the target brightness value of the adaptive scene, so as to enhance or reduce the image brightness. The exposure control method and the device provided by the technical scheme of the invention adaptively adjust the complexity and diversity of the scene, and ensure the speed and stability of automatic exposure control.

Exposure control method and device

The invention provides a wearable guide apparatus for totally blind people. The wearable guide apparatus comprises a head-mounted glasses support, a sensor, an image collector, an audio module, an information output device and a data processing center; the head-mounted glasses support is used for mounting and connecting parts of the apparatus and convenient for a user to wear; the sensor is used for detecting the environment around; the image collector is used for recording an image of the surrounding; the audio module is used for audio interaction; the information output device is used for reminding a wearer of related information; the data processing center is used for total control of the apparatus. The apparatus is capable of acquiring a real scene all-dimensionally in real time, the sensor is used to detect the environment around all-dimensionally, analyzed data is wirelessly transmitted to a remote monitoring unit, and blind guidance and remote monitoring are achieved.

Wearable guide apparatus for totally blind people

The invention discloses an image processing method and an image processing device The method comprises the steps of acquiring two heterogeneous sensor images, calculating gradient direction diagrams of the two heterogeneous sensor images, traversing the gradient direction diagrams and calculating mutual information of a matching window as matching cost, and performing calculation to acquire initial parallax images of corresponding pixels according to the matching cost and a preset stereo matching algorithm The problem that stereo matching of infrared and visible-light images is very difficult is solved, and the actual application requirements are met

Image processing method and image processing device

The invention discloses a dual-binocular infrared and visible light fused stereo imaging system and relates to the field of binocular stereo imaging system. The system comprises a left field visible light camera and a right field visible light camera which are arranged symmetrically and align to an object to be measured to guarantee parallel optical axes and co-plane imaging planes. A left field dichroscope and a right field dichroscope are arranged symmetrically and are arranged in front of the left field visible light camera and the right field visible light camera respectively. A left field infrared camera and a right field infrared camera are arranged symmetrically and are arranged on the outsides of the left field visible light camera and the right field visible light camera respectively, and lenses face towards the left field dichroscope and the right field dichroscope respectively. By means of the system, by the design of a dual-binocular infrared and visible light image fusion technology, the defect of the single-wave-band stereo imaging system is compensated, and the problem of accuracy reduction of images obtained due to matching among systems is solved.

Dual-binocular infrared and visible light fused stereo imaging system

The embodiment of the invention discloses a calibration and correction method and device of multiple cameras, electronic equipment, a computer program and a storage medium. The method comprises: respectively carrying out calibration of camera parameters on the multiple cameras, wherein calibration of at least two cameras in the multiple cameras is carried out respectively on the basis of respectively shot images with resolution thereof; and carrying out correction the multiple cameras according to calibrated data, and adjusting images, which are shot by the at least two cameras, to images withthe same resolution in a correction process. The embodiment of the invention can improve precision of calibration and correction of the multiple cameras.

Calibration and correction method and device of multiple cameras, equipment, program and medium

The invention provides a method for acquiring 4D scene information. According to the method, a binocular stereo vision three-dimensional imaging system and an infrared imaging system are combined, through methods of image registration and image fusion, three-dimensional stereo coordinate information and temperature information of a certain position in the real world can be simultaneously acquired, and four-dimensional expression of the real world is realized in a computer. The method mainly comprises steps that: visible light images and infrared images of a left view and a right view of a shooting scene are received and are then pre-processed respectively; characteristic point extraction is then carried out, characteristic point matching is further carried out, and all registration points on the visible light images and the infrared images are established; on the basis of distance and focal length information between two visible light imaging systems, and a depth map of the shooting scene of the two visible light images can be calculated to acquire three dimensional coordinate information of the scene; according to the determined registration points, an interpolation algorithm is employed to realize superposition of the temperature information and the three-dimensional coordinate information, multi-resolution information fusion is realized, and 4D information of the shooting scene can be finally acquired.

Method for acquiring 4D scene information

The invention provides a transient real-time automatic exposure arithmetic method aiming at the problems that a traditional automatic exposure algorithm is only capable of being appropriate for a common scene with less brightness variation, and adjusting time is long and an objective cannot be shot effectively in a highlight scene. The automatic exposure method comprises the following steps that a perfect objective gray level is set after a camera is powered up; a supersaturation judging mechanism is run at a pre-shoot stage; a normal scene is confirmed when a supersaturation state is not detected, and a conventional automatic exposure algorithm is pointed to until data is output; a highlight scene is confirmed when the supersaturation state is detected, an exposure value and a gain value are adjusted to be minimum values directly, then adjustment is conducted according to the conventional automatic exposure algorithm on this basis until the best position is achieved, and the data output is finished.

Transient automatic exposure method appropriate for transient highlight scene

This paper designs a compact apochromatic lens with long focal length, which operates over very-broad spectrum from 400nm to 900nm for high resolution image application. The focal length is 290mm, and F-number is 4.5.In order to match CCD sensor, lens resolution must be higher than 100lp/mm. It is a significant challenge to correct secondary spectrum over very-broad spectrum for this application. The paper firstly pays much attention on dispersion characteristic of optical materials over this very-broad spectrum, and dispersion characteristic of glasses is analyzed. After properly glasses combinations and optimal lens structure selected, this compact apochromatic lens is designed. The lens described in this paper comprises fewer lenses, most of them are ordinary optical materials, and only one special flint type TF3 with anomalous dispersion properties is used for secondary spectrum correction. Finally, the paper shows MTF and aberration curve for performance evaluation. It can be seen that MTF of the designed lens nearly reach diffraction limit at Nyquist frequency 100lp/mm, and residual secondary spectrum is greatly reduced to less than 0.03mm (in the lines 550nm and 787.5nm). The overall length of this compact apochromatic lens is just 0.76 times its focal length, and because of fewer lenses and ordinary optical materials widely used, production cost is also greatly reduced.

Design of compact apochromatic lens with very-broad spectrum and high resolution

We present a field-programmable gate array (FPGA)-based hardware architecture for high-speed camera which have fast
auto-exposure control and colour filter array (CFA) demosaicing. The proposed hardware architecture includes the
design of charge coupled devices (CCD) drive circuits, image processing circuits, and power supply circuits. CCD drive
circuits transfer the TTL (Transistor-Transistor-Logic) level timing Sequences which is produced by image processing
circuits to the timing Sequences under which CCD image sensor can output analog image signals. Image processing
circuits convert the analog signals to digital signals which is processing subsequently, and the TTL timing, auto-exposure
control, CFA demosaicing, and gamma correction is accomplished in this module. Power supply circuits provide the
power for the whole system, which is very important for image quality. Power noises effect image quality directly, and
we reduce power noises by hardware way, which is very effective. In this system, the CCD is KAI-0340 which is can
output 210 full resolution frame-per-second, and our camera can work outstandingly in this mode. The speed of
traditional auto-exposure control algorithms to reach a proper exposure level is so slow that it is necessary to develop a
fast auto-exposure control method. We present a new auto-exposure algorithm which is fit high-speed camera. Color
demosaicing is critical for digital cameras, because it converts a Bayer sensor mosaic output to a full color image, which
determines the output image quality of the camera. Complexity algorithm can acquire high quality but cannot implement
in hardware. An low-complexity demosaicing method is presented which can implement in hardware and satisfy the
demand of quality. The experiment results are given in this paper in last.

Field-programmable gate array-based hardware architecture for high-speed camera with KAI-0340 CCD image sensor

The invention provides a Bell format image broken line eliminating method based on directional interpolation correction. The method comprises the following steps of firstly detecting the gradient information of the component to be interpolated of a point to be interpolated in the 45-degree, 90-degree and 135-degree directions, selecting pixels in the direction orthogonal to the direction with a maximum gradient absolute value for interpolation, and then utilizing the difference of other two component estimation values of the point to be interpolated for correction. The Bell format image broken line eliminating method based on directional interpolation correction is simple in implementation and better in effect, and has wide application and popularization values in the field of photoelectronic imaging.

Bell format image broken line eliminating method based on directional interpolation correction

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