8 results about "Exposure period" patented technology

The invention discloses an image motion compensation method based on a grooved cam, and the method comprises the steps: firstly, determining the target angular velocity of a plane mirror based on the input angular velocity, carrying out the interval division of a compensation period, setting an extension path, a far stop, a return path and a near stop, and carrying out the image motion compensation of an imaging system during the exposure integration period, an equal-acceleration section, a constant-speed section and an equal-deceleration section are arranged in the extending stroke section; then, obtaining a matching relation between the exposure integral time of the camera and a constant-speed extending stroke section according to different internal and external trigger modes; secondly, constructing a lift function to determine a cam profile, generating a cam theoretical pitch curve, and performing normal equidistant correction to obtain an actual groove profile; and finally, obtaining a direct mapping relation between the rotating speed of the plane mirror and the rotating speed of the groove cam through a mechanism motion transmission relation, so that a visual axis which is output in an exposure period and is opposite to an image motion direction is slightly deflected to restrain the image motion. The method is high in real-time performance, does not need complex control, and is good in compensation synchronism and repeatability.

An image capturing apparatus comprises: a plurality of pixels each including a sensor that outputs pulses at a frequency corresponding to a frequency of receiving a photon, and a counter that counts the number of the pulses; a control unit that controls a timing for resetting count values and a timing for reading out the count values; and a generation unit that generates a first signal at a predetermined first frame rate based on the count values read out at a plurality of different timings and the timings at which the count values are read out, and generates a second signal at a second frame rate corresponding to an exposure period longer than each frame period of the first frame rate. Upon resetting the count values, the control unit controls to read out the count values and then reset the count values.

This invention provides an exposure period adjustment device and method, relating to the field of ultra-precision measurement. The device includes a control module and first, second, third, and fourth motorized mirror groups connected to the control module, as well as first and second position detectors and a period measurement module. It also includes first and second beam splitters and first and second decoupling lenses. A first incident beam can pass sequentially through the second motorized mirror group, the first motorized mirror group, and the first beam splitter; a second incident beam can pass sequentially through the fourth motorized mirror group, the third motorized mirror group, and the first beam splitter; the two incident beams have the same incident point at the first beam splitter; the beam split by the first beam splitter has one path that enters the period measurement module, and the other path that passes through the second beam splitter; the beam split by the second beam splitter has one path that passes through the first decoupling lens and reaches the first position detector, and the other path that passes through the second decoupling lens and reaches the second position detector. This device offers high adjustment accuracy and a wide range of applications.

The invention relates to an SPAD ranging method and system based on dynamic histogram storage and multi-frame fusion, and the method comprises the steps: splitting a single-frame measurement period into a plurality of subframes, and configuring corresponding phase delay amounts, so that each subframe corresponds to a different equivalent sampling time reference; for each sub-frame, in each exposure period, screening photon trigger events of a plurality of SPAD in a macro pixel, and outputting effective photon response time, time calibration information and trigger intensity; dynamically tracking the return moment of the echo photons based on the output in the current exposure period, and generating a processing result; integrating the processing results of all the exposure periods in the current sub-frame to generate a candidate histogram; and reconstructing a fusion histogram through data fusion based on the candidate histograms corresponding to all the subframes and the respective phase delay amounts, analyzing the fusion histogram by using a flight time extraction algorithm, and outputting a distance measurement result. According to the method, high-resolution three-dimensional imaging can be realized under the condition of limited hardware resources.

To provide a controller capable of highly accurately correcting minute and high-speed blurring during exposure.SOLUTION: The control device (9) includes an acquirer (9a) configured to acquire information relating to an exposure period, and a controller (9b) configured to control the first blur corrector (13) and the second blur corrector (7) in the exposure period based on the information, the exposure period includes a first period and a second period, the first shake correction means has a smaller stroke and higher responsiveness than the second shake correction means, and the control means drives the first shake correction means in the first period and drives the second shake correction means and does not drive the first shake correction means in the second period.SELECTED DRAWING: Figure 1

While deterioration of image quality accompanying an irradiation period is suppressed, deterioration of image quality accompanying a shortage of exposure time is suppressed to be lower. A photographing apparatus includes a first camera and a second camera having sensitivity to infrared light, a first light projector and a second light projector that respectively irradiate infrared light to photographing ranges of the first camera and the second camera, and a control device that controls the cameras and the light projectors. An irradiation range of infrared light based on the first light projector partially overlaps an irradiation range of infrared light based on the second light projector. A photographing image of the first camera is an image having a higher priority than a photographing image of the second camera. The control device controls so that a first irradiation / exposure period in the first light projector and the first camera and a second irradiation / exposure period in the second light projector and the second camera do not overlap in a unit photographing period, and the first irradiation / exposure period in the unit photographing period is changed according to a value of a dynamic range in the photographing image of the first camera.

This invention provides a storage-saving DTOF ranging method, apparatus, and electronic device. The original laser period is decomposed into two coprime positive integers to obtain a first exposure period and a second exposure period. The target object is exposed during the first exposure period to obtain a first histogram. The target object is then exposed again during the second exposure period to obtain a second histogram. Peak finding processing is performed on both the first and second histograms to obtain the first flight time corresponding to the highest peak in the first histogram and the second flight time corresponding to the highest peak in the second histogram. The distance information of the target object is calculated based on the linear relationship between the first exposure period, the second exposure period, the first flight time, and the second flight time. By decomposing the original laser period into two coprime exposure periods and performing two exposures to obtain the distance of the target object, the maximum laser period is reduced without affecting the ranging, thus effectively saving storage space for histogram statistics.

A photoelectric conversion device includes a photoelectric conversion unit configured to output a pulse signal according to incidence of a photon, a first counter configured to count the pulse signal, an exposure control circuit configured to control a count period of the pulse signal by the first counter according to a result of a plurality of comparisons of a count value of the first counter with a predetermined threshold value during an exposure period of one frame, a second counter configured to count each time it is determined that the count value of the first counter is equal to or less than the threshold value, and a comparison circuit configured to compare a count value of the second counter in a first frame with a count value of the second counter in a second frame before the first frame and output event information according to a comparison result.