CN111273050A - Signal acquisition processing method and device - Google Patents

Abstract

Embodiments of the present disclosure relate to a signal acquisition and processing method and a signal acquisition and processing device. Wherein, the signal collection and processing method includes: performing first processing on the optical signal from the target scene; and collecting the optical signal after the first processing. The method and device of the embodiments of the present disclosure reduce the amount of data, lower the performance requirements of the signal acquisition device, and improve the signal acquisition and processing speed.

Description

Signal acquisition and processing method and device

technical field

The present disclosure belongs to the technical field of signal processing, and relates to a signal acquisition and processing method and device, in particular to a signal acquisition and processing method and a signal acquisition and processing device corresponding to the signal acquisition and processing method.

Background technique

"Images" are one of the most important types of information in today's intelligent age. From industry to entertainment, from autonomous driving to mobile terminals, every segment needs image information to help humans and machines "understand the world".

In some application scenarios, people often do not use the collected images directly, but use the images after further computer algorithm processing. After these processing, the information of the images has higher use value. In the current algorithm processing flow, generally, after image information is collected, the image information is stored in a computer, and then the computer is used to execute an image processing algorithm on the collected image. Since a computer is used to store the collected data and process a large amount of data, the existing method has slow processing speed, poor real-time performance and low efficiency. For example, the speed of current image processing systems is generally within 100 Hz, which is difficult to meet people's needs in certain application scenarios.

SUMMARY OF THE INVENTION

Embodiments of the present disclosure provide a signal acquisition and processing method and a signal acquisition and processing device to solve the above technical problems.

According to at least one embodiment of the present disclosure, there is provided a signal acquisition and processing method, comprising: performing first processing on an optical signal from a target scene; and acquiring the optical signal after the first processing.

The method according to any of the foregoing embodiments of the present disclosure, for example, further includes: obtaining information in the target scene based on the collected data.

According to the method of any of the foregoing embodiments of the present disclosure, for example, the obtaining the information in the target scene based on the collected data includes: performing a second process on the collected data to obtain the information in the target scene; obtaining the information in the target scene; of said information to form an image.

According to the method of any one of the foregoing embodiments of the present disclosure, for example, performing the first processing on the light signal from the target scene includes: determining an encoded signal of the target scene; The signal is encoded, and the encoded signal is an optical signal.

According to the method of any of the foregoing embodiments of the present disclosure, for example, the collecting the first processed optical signal includes: collecting the encoded optical signal, the encoded optical signal Information including the encoded signal and light signal from the target scene is included.

According to the method of any one of the foregoing embodiments of the present disclosure, for example, the encoded optical signal is an integral result of the multiplication of the encoded signal and the optical signal from the target scene.

According to the method of any of the foregoing embodiments of the present disclosure, for example, performing the first processing on the light signal from the target scene further comprises: projecting the light signal from the target scene to a spatial light modulator; the determining the target scene The encoded signal includes: determining the modulation signal of the spatial light modulator; and the encoding processing of the optical signal from the target scene based on the encoded signal includes: pairing the optical signal from the target scene based on the modulation signal of the spatial light modulator The optical signal from the target scene is modulated.

According to the method of any one of the foregoing embodiments of the present disclosure, for example, the modulation signal includes a frequency parameter and a phase parameter, and the determining the modulation signal of the spatial light modulator includes: determining the frequency parameter of the modulation signal; determining the phase parameter of the modulated signal; the modulated signal is determined based on the frequency parameter and the phase parameter.

According to the method of any one of the foregoing embodiments of the present disclosure, for example, determining the frequency parameter of the modulated signal comprises: determining a property and/or type of a pre-collected optical signal, based on the property and/or type of the pre-collected optical signal , and determine the frequency parameter of the modulated signal.

According to the method of any of the foregoing embodiments of the present disclosure, for example, determining the frequency parameter of the modulation signal includes: determining the complexity of the target scene; and determining the frequency parameter of the modulation signal based on the complexity.

According to the method of any of the foregoing embodiments of the present disclosure, for example, the target scene includes a moving object or a brightness-changing object, and determining the frequency parameter of the modulation signal includes: determining a motion parameter or the brightness of the moving object The brightness change parameter of the changing object, and the frequency parameter of the modulation signal is determined based on the motion parameter or the brightness change parameter.

According to the method of any of the foregoing embodiments of the present disclosure, for example, the projecting the optical signal from the target scene to the spatial light modulator includes: passing the optical signal from the target scene through a first optical element; The optical signal of the first optical element is projected onto the spatial light modulator; the spatial light modulator receives and modulates the optical signal projected onto the optical element after passing through the optical element.

According to the method of any of the foregoing embodiments of the present disclosure, for example, the spatial light modulator includes a plurality of sub-modulation units, and the projecting the light signal from the target scene to the spatial light modulator includes: converting the light signal from the target scene to the spatial light modulator. The optical signal of the spatial light modulator is projected onto the sub-modulation unit of the spatial light modulator, and the determining the modulation signal of the spatial light modulator includes: determining the sub-modulation signal of each sub-modulation unit of the spatial light modulator ; the modulating the optical signal from the target scene based on the modulation signal of the spatial light modulator includes: modulating the optical signal from the target scene based on the sub-modulation signal of the sub-modulation unit.

According to the method of any one of the foregoing embodiments of the present disclosure, for example, the sub-modulation signal includes a frequency parameter and a phase parameter, and the determining the sub-modulation signal of each of the sub-modulation units of the spatial light modulator includes: determining each of the sub-modulation units of the spatial light modulator. frequency parameters of the sub-modulation signals; determining phase parameters of each of the sub-modulation signals; determining the sub-modulation signals based on the frequency parameters and phase parameters of the sub-modulation signals.

According to the method of any of the foregoing embodiments of the present disclosure, for example, the determining the frequency parameter of the sub-modulation signal includes: predetermining information to be obtained from the target scene, based on the information to be obtained from the target scene , to determine the frequency quantity and/or frequency value in the frequency parameter of the sub-modulation signal of the sub-modulation unit.

According to the method of any of the foregoing embodiments of the present disclosure, for example, the determining the frequency parameter and the phase parameter of each of the sub-modulation signals further comprises: determining the position of each of the sub-modulation units in the spatial light modulator , and also determine a frequency parameter and/or a phase parameter of each of the sub-modulation units based on the position.

According to the method of any of the foregoing embodiments of the present disclosure, for example, the modulation signal of each sub-modulation unit of the plurality of sub-modulation units adopts the same frequency.

According to the method of any of the foregoing embodiments of the present disclosure, for example, modulation signals of at least two sub-modulation units in the plurality of sub-modulation units use different frequencies.

According to the method of any of the foregoing embodiments of the present disclosure, for example, the frequency value is in a low frequency frequency range.

According to the method of any of the foregoing embodiments of the present disclosure, for example, 0 is included in the plurality of frequency values.

According to the method of any of the foregoing embodiments of the present disclosure, for example, 0 is not included in the plurality of frequency values.

According to the method of any of the foregoing embodiments of the present disclosure, for example, the frequency parameter of the modulation signal of the sub-modulation unit is related to the first time, and the first time is related to the performance parameter of the apparatus for collecting the optical signal.

According to the method of any of the foregoing embodiments of the present disclosure, for example, the frequency of the modulation signal of the sub-modulation unit is less than or equal to the inverse of the first time.

According to the method of any of the preceding embodiments of the present disclosure, the number of frequencies is determined, for example, based on the number of images formed in a first time.

According to the method of any of the foregoing embodiments of the present disclosure, for example, the number of frequencies is proportional to the number of images formed within the first time.

According to the method of any one of the foregoing embodiments of the present disclosure, for example, when the number of frequencies is multiple, the numerical interval between the multiple frequencies is determined based on the first time.

According to the method of any of the foregoing embodiments of the present disclosure, for example, the numerical interval is less than or equal to the reciprocal of the first time.

According to the method of any of the foregoing embodiments of the present disclosure, for example, the phase parameters of at least three sub-modulation units in the plurality of sub-modulation units are different.

According to the method of any of the foregoing embodiments of the present disclosure, for example, the phase distribution of the phase parameter in the modulation signal of the sub-modulation unit is in the range of 0-2π.

According to the method of any of the foregoing embodiments of the present disclosure, for example, determining the sub-modulation signal of each of the sub-modulation units of the spatial light modulator further comprises: dividing the plurality of sub-modulation units into a plurality of groups, each group including at least two sub-modulation units, all sub-modulation units in each group of sub-modulation units are located adjacent to each other in the spatial light modulator; and the sub-modulation signals of the sub-modulation units are determined based on the group.

According to the method of any one of the foregoing embodiments of the present disclosure, for example, the determining the sub-modulation signal of the sub-modulation unit based on the group includes: determining the frequency value of the modulation signal of each group of sub-modulation units, and the frequency value of the sub-modulation signal of each group is determined. If the frequency values are the same, the phase values of the modulation signals of each group of sub-modulation units are determined, and the phase values of the sub-modulation signals of each group are different.

According to the method of any of the foregoing embodiments of the present disclosure, for example, the frequency values of the sub-modulation signals of each group of sub-modulation units are different from the frequency values of the modulation signals of the adjacent groups of sub-modulation units.

According to the method of any of the foregoing embodiments of the present disclosure, for example, the frequency value of the sub-modulation signal of each group of sub-modulation units is the same as the frequency value of the modulation signals of other adjacent groups of sub-modulation units.

According to the method of any one of the foregoing embodiments of the present disclosure, for example, the sub-modulation units include optical mirrors, the optical mirrors have respective central axes as axes, and are performed at frequencies and phases corresponding to the modulation signals of the sub-modulation units swing.

According to the method of any of the foregoing embodiments of the present disclosure, for example, the sub-modulation unit includes a liquid crystal cell, and the liquid crystal cell is turned on and off at a frequency and a phase corresponding to a modulation signal of the sub-modulation unit.

According to the method of any of the foregoing embodiments of the present disclosure, for example, the target scene includes at least one moving object or at least one brightness-changing object, and the performing the first processing on the light signal from the target scene includes: according to the moving object or at least one motion parameter or brightness change parameter of a brightness-changing object, determine at least one frequency parameter and/or at least one phase parameter in the modulation signal; determine the modulation signal based on the at least one frequency parameter and/or at least one phase parameter .

According to the method of any of the foregoing embodiments of the present disclosure, for example, the frequency value range of the frequency parameter of the modulation signal is greater than or equal to the frequency value range of the at least one frequency parameter.

According to the method of any one of the foregoing embodiments of the present disclosure, for example, the motion parameter includes a motion speed, the brightness change parameter includes a brightness change speed, and the at least one motion parameter or at least one of the moving object or the brightness changing object Brightness change parameter, determining at least one frequency value in the modulation signal includes: determining at least one time value of the at least one moving object or the brightness changing object passing through a detection unit of the optical signal collection device according to the moving speed or the brightness changing speed Or the brightness change point of the brightness changing object is at least one time value passing through the detection unit; the at least one frequency value is determined according to the at least one time value.

According to the method of any one of the foregoing embodiments of the present disclosure, for example, the motion parameter further includes acceleration, the brightness change parameter further includes a brightness change acceleration, and determining the at least one according to the movement speed or the brightness change speed At least one time value of a moving object or a brightness-changing object passing through a detection unit of the optical signal acquisition device or at least one time value of the brightness-changing point of the brightness-changing object passing through the detection unit includes: according to the motion acceleration and For the moving speed, respectively determine multiple moving speeds of the moving object; according to the multiple moving speeds, respectively determine multiple time values for the moving object to pass through a detection unit of the optical signal acquisition device; or, according to the brightness Change acceleration and brightness change speed, respectively determine multiple brightness change speeds of the brightness change object; according to the multiple brightness change speeds, respectively determine multiple brightness change points of the brightness change object passing through a detection unit of the optical signal acquisition device. time value.

According to the method of any of the foregoing embodiments of the present disclosure, for example, collecting the first processed optical signal includes: projecting the optical signal modulated by the spatial light modulator to an image detector; the image detection The device collects the modulated optical signal.

According to the method of any of the foregoing embodiments of the present disclosure, for example, the spatial light modulator includes a plurality of sub-modulation units, the image detector includes a plurality of sub-detection units, and one sub-modulation unit corresponds to a sub-unit of one or more image detectors A detection unit; the collection of the modulated optical signal by the image detector includes: the sub-detection unit collects the optical signal modulated by the corresponding sub-modulation unit.

According to the method of any one of the foregoing embodiments of the present disclosure, for example, the acquisition of the modulated optical signal by the image detector includes: within a first time, the image detector performs an operation on the encoded optical signal. acquisition, the first time is related to the performance index of the image detector.

According to the method of any of the foregoing embodiments of the present disclosure, for example, projecting the optical signal modulated by the spatial light modulator to the image detector comprises: passing the optical signal modulated by the spatial light modulator through a second optical element; The light signal passing through the second optical element is projected to the image detector.

According to the method of any of the foregoing embodiments of the present disclosure, for example, the obtaining the information in the target scene based on the collected data includes: obtaining an encoded signal corresponding to an optical signal from the target scene; The collected data obtains information in the target scene.

According to the method of any of the foregoing embodiments of the present disclosure, for example, the acquiring an encoded signal corresponding to the optical signal from the target scene includes: acquiring a frequency parameter in the encoded signal as a first parameter; Obtaining the information in the target scene from the signal and the collected data includes: obtaining a second parameter based on the collected data; and performing a second process on the collected data based on the first and second parameters to obtain information in the target scene.

According to the method of any of the foregoing embodiments of the present disclosure, for example, the collected data includes a plurality of pixel points, each pixel point is associated with a sub-modulation unit of the spatial light modulator performing the first processing, the sub-modulation There are multiple units, which are divided into multiple groups. The obtaining the second parameter based on the collected data includes: taking multiple pixel points corresponding to a group of sub-modulation units as a pixel point group, based on one or more pixel point groups , and determine the second parameter.

According to another embodiment of the present disclosure, a signal acquisition and processing device is further provided, including: a signal processing device configured to perform first processing on an optical signal from a target scene; a signal acquisition device configured to The first processed optical signal is collected.

The apparatus according to any of the foregoing embodiments of the present disclosure, for example, further includes an information obtaining apparatus configured to obtain information in the target scene based on the collected data.

According to the device according to any of the foregoing embodiments of the present disclosure, for example, the information obtaining device is further configured to perform second processing on the collected data to obtain information in the target scene; and form the obtained information into an image .

According to the apparatus according to any of the foregoing embodiments of the present disclosure, for example, the signal processing apparatus is further configured to determine an encoded signal of the target scene; and to encode the optical signal from the target scene based on the encoded signal processing, and the encoded signal is an optical signal.

According to the apparatus according to any of the foregoing embodiments of the present disclosure, for example, the signal collection apparatus is further configured to collect the encoded optical signal, where the encoded optical signal includes information of the encoded signal and the light signal from the target scene.

According to the apparatus according to any of the foregoing embodiments of the present disclosure, for example, the encoded optical signal is an integral result of the multiplication of the encoded signal and the optical signal from the target scene.

The apparatus according to any of the foregoing embodiments of the present disclosure, for example, the signal processing apparatus includes a modulation signal determination unit and a spatial light modulator; the modulation signal determination unit is configured to determine a modulation signal; the spatial light modulator is based on a modulation The signal modulates the light signal from the target scene.

According to the apparatus according to any of the foregoing embodiments of the present disclosure, for example, the modulation signal includes a frequency parameter and a phase parameter, and the modulation signal determining unit is further configured to determine the frequency parameter and the phase parameter, and based on the frequency parameter and the phase parameter The phase parameter determines the modulated signal.

According to the apparatus of any of the foregoing embodiments of the present disclosure, for example, the modulation signal determination unit determines the properties and/or types of pre-collected optical signals, and determines the modulation signals based on the properties and/or types of pre-collected optical signals frequency parameter.

According to the apparatus according to any of the foregoing embodiments of the present disclosure, for example, the modulation signal determination unit determines the complexity of the target scene, and determines the frequency parameter of the modulation signal based on the complexity.

According to the apparatus of any one of the foregoing embodiments of the present disclosure, for example, the target scene includes a moving object or a brightness-changing object, and the modulation signal determining unit determines a motion parameter of the moving object or a brightness-changing parameter of the brightness-changing object , and determine the frequency parameter of the modulated signal based on the motion parameter or the brightness change parameter.

The device according to any of the foregoing embodiments of the present disclosure, for example, further comprises a first optical element, the light signal from the target scene passes through the first optical element; the light signal passing through the first optical element is projected to the space on the light modulator; the spatial light modulator receives and modulates the light signal projected onto the optical element after passing through the optical element.

According to the apparatus according to any of the foregoing embodiments of the present disclosure, for example, the spatial light modulator includes a plurality of sub-modulation units, and the optical signal from the target scene is projected onto the sub-modulation units of the spatial light modulator, so The modulation signal determining unit determines a sub-modulation signal of the sub-modulation unit of each of the spatial light modulators; the spatial light modulator, based on the determined sub-modulation signal of the sub-modulation unit, determines the light from the target scene for the light from the target scene. The signal is modulated.

According to the apparatus of any of the foregoing embodiments of the present disclosure, for example, the sub-modulation signal includes a frequency parameter and a phase parameter, and the modulation signal determining unit determines the frequency parameter and the phase parameter, based on the frequency of the sub-modulation signal The parameters and phase parameters determine the sub-modulated signal.

According to the apparatus according to any of the foregoing embodiments of the present disclosure, for example, the modulated signal determination unit is further configured to pre-determine information to be obtained from the target scene, and based on the information to be obtained from the target scene, determine The frequency quantity and/or frequency value in the frequency parameter of the sub-modulation signal of the sub-modulation unit.

According to the apparatus of any of the foregoing embodiments of the present disclosure, for example, the modulation signal determination unit is further configured to determine a position of each of the sub-modulation units in the spatial light modulator, and to determine each of the sub-modulation units based on the position frequency parameters and/or phase parameters of each of the sub-modulation units.

According to the apparatus of any of the foregoing embodiments of the present disclosure, for example, the modulation signal of each sub-modulation unit of the plurality of sub-modulation units adopts the same frequency.

According to the apparatus of any of the foregoing embodiments of the present disclosure, for example, modulation signals of at least two sub-modulation units in the plurality of sub-modulation units use different frequencies.

According to the apparatus of any of the foregoing embodiments of the present disclosure, for example, the frequency value is in a low frequency frequency range.

According to the apparatus according to any of the foregoing embodiments of the present disclosure, for example, the plurality of frequency values includes 0.

According to the apparatus according to any of the foregoing embodiments of the present disclosure, for example, 0 is not included in the plurality of frequency values.

According to the device according to any of the foregoing embodiments of the present disclosure, for example, the frequency parameter of the modulation signal of the sub-modulation unit is related to the first time, and the first time is related to the performance parameter of the signal acquisition device.

According to the apparatus of any of the foregoing embodiments of the present disclosure, for example, the frequency of the modulation signal of the sub-modulation unit is less than or equal to the inverse of the first time.

The apparatus according to any of the preceding embodiments of the present disclosure, for example, determines the number of frequencies based on the number of images formed within a first time.

According to the apparatus of any of the foregoing embodiments of the present disclosure, for example, the number of frequencies is proportional to the number of images formed within the first time.

According to the apparatus of any of the foregoing embodiments of the present disclosure, for example, when the number of frequencies is multiple, the numerical interval between the multiple frequencies is determined based on the first time.

According to the device of any of the foregoing embodiments of the present disclosure, for example, the numerical interval is less than or equal to the reciprocal of the first time.

According to the apparatus of any of the foregoing embodiments of the present disclosure, for example, at least three sub-modulation units in the plurality of sub-modulation units have different phase parameters.

According to the apparatus of any of the foregoing embodiments of the present disclosure, for example, the phase distribution of the phase parameter in the modulation signal of the sub-modulation unit is in the range of 0-2π.

According to the apparatus of any of the foregoing embodiments of the present disclosure, for example, the plurality of sub-modulation units are divided into a plurality of groups, each group includes at least two sub-modulation units, and all sub-modulation units in each group of sub-modulation units are in the spatial light modulation The spatial positions in the sub-modulation unit are adjacent; the modulation signal determination unit determines the sub-modulation signal of the sub-modulation unit based on the group.

According to the apparatus according to any of the foregoing embodiments of the present disclosure, for example, the frequency values of each group of sub-modulation signals are the same, and the phase values of each group of sub-modulation signals are different.

According to the apparatus of any one of the foregoing embodiments of the present disclosure, for example, the frequency value of the sub-modulation signal of each group of sub-modulation units is different from the frequency value of the modulation signals of other adjacent groups of sub-modulation units.

According to the apparatus of any of the foregoing embodiments of the present disclosure, for example, the frequency value of the sub-modulation signal of each group of sub-modulation units is the same as the frequency value of the modulation signals of other adjacent groups of sub-modulation units.

According to the device according to any one of the foregoing embodiments of the present disclosure, for example, the sub-modulation unit includes an optical lens, the optical lens has a respective central axis as an axis, and performs a frequency and phase corresponding to the modulation signal of the sub-modulation unit. swing.

According to the device of any of the foregoing embodiments of the present disclosure, for example, the sub-modulation unit includes a liquid crystal cell, and the liquid crystal cell is turned on and off at a frequency and phase corresponding to a modulation signal of the sub-modulation unit.

According to the apparatus of any of the foregoing embodiments of the present disclosure, for example, the target scene includes at least one moving object or at least one brightness-changing object, and the modulation signal determining unit is further configured to, according to the moving object or the brightness-changing object at least one motion parameter or brightness change parameter of the modulated signal, determine at least one frequency parameter and/or at least one phase parameter in the modulation signal; determine the modulation signal based on the at least one frequency parameter and/or at least one phase parameter.

According to the apparatus of any of the foregoing embodiments of the present disclosure, for example, the frequency value range of the frequency parameter of the modulation signal is greater than or equal to the frequency value range of the at least one frequency parameter.

According to the apparatus according to any of the foregoing embodiments of the present disclosure, for example, the motion parameter includes a motion speed, the brightness change parameter includes a brightness change speed, and the modulation signal determining unit determines the At least one time value of at least one moving object or brightness-changing object passing through a detection unit of the optical signal acquisition device or at least one time value of the brightness-changing point of the brightness-changing object passing through the detection unit; according to the at least one time value value determines the at least one frequency value.

According to the device according to any one of the foregoing embodiments of the present disclosure, for example, the motion parameter further includes acceleration, the brightness change parameter further includes brightness change acceleration, and the modulation signal determining unit, according to the motion acceleration and the motion speed, respectively Determine a plurality of moving speeds of the moving object; according to the plurality of moving speeds, respectively determine a plurality of time values of the moving object passing through a detection unit of the optical signal acquisition device; or, the modulation signal determining unit according to the brightness Change acceleration and brightness change speed, respectively determine multiple brightness change speeds of the brightness change object; according to the multiple brightness change speeds, respectively determine multiple brightness change points of the brightness change object passing through a detection unit of the optical signal acquisition device. time value.

According to the device of any of the foregoing embodiments of the present disclosure, for example, the signal acquisition device includes an image detector, and the optical signal modulated by the spatial light modulator is projected to the image detector; optical signal is collected.

According to the device of any of the foregoing embodiments of the present disclosure, for example, the spatial light modulator includes a plurality of sub-modulation units, the image detector includes a plurality of sub-detection units, and one sub-modulation unit corresponds to one or more sub-units of the image detector A detection unit; the sub-detection unit collects the optical signal modulated by the corresponding sub-modulation unit.

According to the apparatus of any of the foregoing embodiments of the present disclosure, for example, the image detector collects the encoded optical signal within a first time, and the first time is related to a performance index of the image detector.

The device according to any of the foregoing embodiments of the present disclosure, for example, further includes a second optical element, the optical signal modulated by the spatial light modulator passes through the second optical element; the optical signal passing through the second optical element is projected to the image detection device.

According to the device according to any of the foregoing embodiments of the present disclosure, for example, the information obtaining device is further configured to obtain a coded signal corresponding to an optical signal from the target scene, and obtain the obtained data according to the coded signal and the collected data. describe the information in the target scene.

According to the apparatus according to any of the foregoing embodiments of the present disclosure, for example, the acquiring an encoded signal corresponding to the optical signal from the target scene includes: acquiring a frequency parameter in the encoded signal as a first parameter; Obtaining the information in the target scene from the signal and the collected data includes: obtaining a second parameter based on the collected data; and performing a second process on the collected data based on the first and second parameters to obtain information in the target scene.

According to the device of any of the foregoing embodiments of the present disclosure, for example, the collected data includes a plurality of pixel points, each pixel point is related to a sub-modulation unit of the spatial light modulator performing the first processing, the sub-modulation There are multiple units, which are divided into multiple groups. The obtaining the second parameter based on the collected data includes: taking multiple pixel points corresponding to a group of sub-modulation units as a pixel point group, based on one or more pixel point groups , and determine the second parameter.

Since in the signal acquisition and processing method and the signal acquisition and processing device according to the embodiments of the present disclosure, the collected image is the information that the user wants to obtain after processing, so the amount of data is greatly reduced, and the performance requirements of the signal acquisition device are lowered. , greatly improving the signal acquisition and processing speed.

Description of drawings

FIG. 1 shows a flowchart of a signal acquisition and processing method according to an embodiment of the present disclosure.

FIG. 2 shows a schematic diagram of a signal acquisition and processing apparatus according to an embodiment of the present disclosure.

FIG. 3 shows a schematic structural diagram of a spatial light modulator according to an embodiment of the present disclosure;

FIG. 4 shows a schematic diagram of another signal acquisition and processing apparatus according to an embodiment of the present disclosure;

Figure 5 shows a schematic diagram of the target scene and the collected data.

FIG. 6 is a flowchart of another signal acquisition and processing method according to an embodiment of the present disclosure.

FIG. 7 shows a schematic diagram of a third signal acquisition and processing apparatus according to an embodiment of the present disclosure.

Figure 8 shows a comparison of images obtained by different approaches.

Figure 9 shows a time domain waveform diagram of a pixel during exposure time.

Detailed ways

The target scene described in the embodiments of the present disclosure is, for example, a scene for which a user wishes to perform signal processing and acquisition. The scene may be a still scene, a moving scene, or a scene including both moving objects and stationary objects. The object mentioned in the present disclosure can be a stationary object or a moving object. If it is a moving object, it includes objects that can produce displacement within a period of time, and also includes objects that do not produce displacement during this period, but the brightness changes, such as neon lights.

FIG. 1 shows a signal acquisition and processing method provided according to an embodiment of the present disclosure. The signal acquisition and processing method of the embodiment of the present disclosure will be described below according to FIG. 1 . Referring to FIG. 1, the signal acquisition and processing method 100 includes the following steps S101-S102.

In S101, a first process is performed on the optical signal from the target scene.

In S102, the first processed optical signal is collected.

In this embodiment of the present disclosure, the optical signal from the target scene is first processed, and then the processed optical signal is collected. Since the collected signal is the signal that the user does not want to obtain has been removed, but the information that the user wants to obtain has been processed, compared with the prior art, the data volume is greatly reduced, and the efficiency of signal processing and collection is greatly reduced. A substantial increase.

FIG. 2 shows a schematic diagram of a signal acquisition and processing apparatus 200 according to an embodiment of the present disclosure. The signal acquisition and processing method 100 corresponds to the signal acquisition and processing apparatus 200 . For the brevity of the description, the method and the device are described at the same time, and all the embodiments and examples related to the method are in one-to-one correspondence with the signal acquisition and processing device, and are the same. The above method and device will be further described below according to FIG. 1 and FIG. 2, respectively.

Referring to FIG. 2 , the signal acquisition and processing apparatus 200 includes a signal processing apparatus 210 and a signal acquisition apparatus 220 . The signal processing device 210 performs first processing on the optical signal from the target scene S. The signal collecting device 220 collects the optical signal after the first processing. The signal processing device 210 is, for example, a device that can process a signal, such as a filtering device, an amplifying device, an encoding device, and the like. The signal collecting device may be a device that collects optical signals, such as an imaging device. For example cameras, charge coupled units, image detectors, photodetectors, etc.

In S101, a first process is performed on the optical signal from the target scene. In the signal acquisition device, the signal processing device 210 performs first processing on the optical signal from the target scene S.

In one example, the light signal from the target scene may be, for example, light projected from the target scene in various manners such as reflection, refraction, transmission, diffraction, etc., or any combination of these manners. The first processing includes various processing methods for the optical signal. For example, the optical signal is filtered, selected, processed, and encoded.

In one example, the first process may encode an optical signal from the target scene. For example, first determine the encoded signal of the target scene. Then, according to the encoded signal of the target scene, the first processing is performed on the optical signal from the target scene, for example, the optical signal from the target scene is encoded by using the encoded signal. In one example, the encoded signal may also be an encoded signal of the control optical signal. For example, the optical path of the light signal from the target scene is controlled by the optical lens or the liquid crystal unit, and/or the parameters such as light intensity are controlled. And/or marking light signals projected at different locations, loading information, etc. That is to say, the first processing process is the processing of the optical signal of the target scene by the encoded signal, and the processed signal is still the optical signal. Since the first processing is performed in the optical domain, its processing speed may reach the speed of light level. Compared with the prior art using a computer to process the collected data, the processing speed is greatly improved.

After the first processing, the encoded optical signal includes the information of the encoded signal and the optical signal from the target scene. For example, the encoded optical signal may be an integral result of multiplying the encoded signal and the optical signal from the target scene. If x(t) represents the optical signal from the target scene and y(t) represents the encoded signal, then the encoded optical signal s(t) can be expressed as s(t)=∫x(t)y(t)dt , where t is the time parameter.

According to an example of the present disclosure, the signal processing apparatus that performs the first processing on the optical signal from the target scene may include a spatial light modulator. Spatial light modulator refers to that under active control, a certain parameter of the light field can be modulated through unit devices, including but not limited to micromirror devices, liquid crystal cells, etc., so as to load information into a one-dimensional or two-dimensional light field, To achieve the purpose of light wave modulation. The parameters include: amplitude, phase, polarization state, and incoherent-coherent light conversion. In the embodiment of the present disclosure, the spatial light modulator is used to modulate the optical signal, and the optical signal with different properties can be encoded, so that the acquisition can be selectively performed in the subsequent signal acquisition process.

As such, the first processing may include projecting the light signal from the target scene to a spatial light modulator, which then modulates the light signal from the target scene. Correspondingly, the encoded signal may be the modulation signal of the spatial light modulator. Before modulation, the modulation signal of the spatial light modulator can be determined first, and then the optical signal from the target scene is coded and modulated based on the modulation signal of the spatial light modulator. For example, the signal acquisition and processing apparatus may include a modulation signal determination unit for determining the modulation signal of the spatial light modulator. The modulated signal determination unit may be any one of a central processing unit, a microprocessor, a computer, a single-chip microcomputer, a chip or a chip set, etc., and may be implemented by software, hardware or firmware.

其中，f表示调制信号中的频率参数，

表示调制信号中的相位参数。t表示时间参数，例如在不同时间点上的调制信号。In one example, the modulated signal may include one or more of frequency and phase parameters and other parameters such as amplitude. The present disclosure is described by taking the frequency parameter and the phase parameter as an example. When determining the modulation signal of the spatial light modulator, the frequency parameter and the phase parameter of the modulation signal can be determined respectively, and the modulation signal is determined based on the frequency parameter and the phase parameter. The modulated signal can be represented by a function, such as the cosine function

where f represents the frequency parameter in the modulated signal,

Represents the phase parameter in the modulated signal. t represents a time parameter, such as the modulated signal at different points in time.

In the embodiment of the present disclosure, the frequency parameter and the phase parameter can be determined in various ways and approaches to determine different modulation signals, achieve different modulation effects, and facilitate subsequent collection of optical signals from the target scene.

In one example, when determining the frequency parameter, the complexity of the target scene may be determined first, and the frequency parameter of the modulated signal is determined based on the complexity. The complexity of the target scene can be considered from several aspects, for example, the number of objects in the target scene, the number and/or motion parameters of moving objects, the number and/or motion parameters of moving objects with different motion modes, and so on. The motion parameters of the moving object, such as speed, acceleration, texture information of the object, object size, etc. The frequency parameter is determined according to the complexity of the target scene, and the amount of data can be properly controlled and adjusted to effectively reduce the amount of unnecessary data.

In addition, in another example, the properties and/or types of the pre-collected optical signals may be determined first, and based on the properties and/or types of the pre-collected optical signals, the frequency parameters of the modulated signals are determined. Here, the pre-collected optical signal may be the optical signal that the user wants to collect, and the optical signal that the user does not want to collect is removed. The pre-collected optical signal is related to the information that the user wishes to obtain from the target scene, and the user only wishes to collect the optical signal corresponding to the information he needs. For example, the pre-collected optical signal only includes foreground information of a specific frequency band in the target scene, but does not include background information and the like.

The properties and/or types of the pre-collected optical signal may include, for example, properties such as brightness, frequency band, wavelength, phase, and amplitude of the optical signal. For example, the pre-collected optical signal is an optical signal with a large brightness value. In most real scenarios, the spectral components of the optical signal with a large brightness value are concentrated in the low-frequency region, so the frequency parameters of the modulated signal can be set in the low-frequency region. area. For another example, the pre-collected optical signal is the background signal in the target scene. Since there is no high-frequency component in the spectrum of the background information, and generally only has a value at the DC component, the frequency parameter can be set to 0, and the collected data obtained in this way is background image. Since the modulation signal in the embodiment of the present disclosure can be determined based on the parameters of the pre-collected optical signal, the collected data is the data that the user wants to obtain, and the obtained information is the information that the user wants to obtain from the target scene, thereby effectively reducing the number of The collection of unnecessary information improves the processing and collection efficiency and reduces the amount of data.

According to an embodiment of the present disclosure, the target scene may include moving objects. As mentioned above, moving objects include moving objects, and/or objects that do not move but have brightness changes, for example, the light of a lamp has brightness changes and the like. In an example, when the target scene includes a moving object, the frequency parameter of the modulation signal may also be determined according to the motion parameter of the moving object when determining the frequency parameter. For example, the spectral bandwidth of a high-speed moving object will be much larger than that of a slow-moving object. Therefore, the frequency parameter can be determined according to the speed of the moving object. Since the modulation signal in the embodiment of the present disclosure can be determined based on the motion parameters of the moving object in the target scene, the trajectory of the moving object can be collected in the subsequent acquisition process, and the motion trajectory can be obtained, without the need to, as in the prior art, The trajectory detection is re-implemented from the acquired image sequence frames, which effectively improves the processing speed.

Since the light signal from the target scene includes light from all directions of the scene, in order to modulate the light signal from all directions of the target scene, in this embodiment of the present disclosure, modulation signals can be set for the light signals from all directions of the target scene respectively and modulation, so that the information of all directions in the target scene can be accurately collected in the subsequent collection process. FIG. 3 shows a schematic structural diagram of a spatial light modulator according to an embodiment of the present disclosure. Referring to FIG. 3 , the spatial light modulator 210 includes a plurality of sub-modulation units 211 . For example, it includes dozens, hundreds or thousands or tens of thousands of sub-modulation units. Only 16 sub-modulation units 211 are shown in FIG. 3 as an example, and other sub-modulation units are not shown. These sub-modulation units are independent units. Each sub-modulation unit can be arranged in a one-dimensional or two-dimensional array in space. Each unit can independently receive the control of optical or electrical signals, and change its own optical properties according to the modulation signal. . In the embodiment of the present disclosure, the light signal from the target scene can be projected onto a plurality of sub-modulation units of the spatial light modulator, so as to realize the modulation of the light waves in various directions irradiated on the spatial light modulator, and realize the modulation of the light waves from the spatial light modulator. The modulation of the amplitude or intensity, phase, polarization state, wavelength, and coherence state of the optical signal of the target scene.

According to an embodiment of the present disclosure, the sub-modulation unit may include various optical devices. For example, it includes optical mirrors, such as mirrors, which take their respective central axes as axes and oscillate with parameters corresponding to the modulation signals of the sub-modulation units. For example, parameters corresponding to the modulation signal, such as frequency and phase, can be preset, and the swing frequency and phase of the mirror can be controlled according to the set frequency and phase. According to another example, the sub-modulation unit may further include a liquid crystal unit, and the liquid crystal unit may be turned on and off at the frequency and phase corresponding to the modulation signal of the sub-modulation unit, thereby modulating the optical signal.

When determining the modulation signal of the spatial light modulator, the sub-modulation signal of the sub-modulation unit of each spatial light modulator may be determined separately. For example, the sub-modulation signal of the sub-modulation unit of the spatial light modulator is determined using the modulation signal determination unit. In this way, when the optical signal from the target scene is encoded, the optical signal from the target scene can be encoded and modulated based on the sub-modulation signal of the sub-modulation unit.

Likewise, the sub-modulation signal may include parameters such as frequency parameters and phase parameters. The frequency parameter and the phase parameter of the sub-modulation signal may be determined respectively, and the sub-modulation signal is determined based on the frequency parameter and the phase parameter of the sub-modulation signal.

Similar to or the same as the method for determining the modulation signal of the spatial light modulator in the foregoing embodiments, when determining the sub-modulation signal, in addition to the factors mentioned in all the foregoing embodiments, one or more of the following aspects may also be considered , to determine the frequency parameters and phase parameters of the sub-modulation signal respectively.

In one example, the frequency parameter of the modulated signal may be determined according to the performance parameter of the signal acquisition device. Signal acquisition devices include imaging devices such as cameras, charge-coupled units, image detectors, and the like. The performance parameters of the signal acquisition device may include resolution, exposure time, and the like. For example, in order to use the principles of discrete Fourier transform for data acquisition, the frequency of the modulation signal of the sub-modulation unit may be correlated with the first time. For example, in order to image a moving scene, the minimum time for changing the moving scene is generally less than the first time, so the modulation frequency value can be set to the inverse of the first time or less than the inverse of the first time. Optionally, the frequency of the modulation signal may be an integer multiple of the inverse of the first time, or a non-integral multiple. The first time is related to performance parameters of the signal acquisition device. For example, the first time may be the exposure time of the signal acquisition device.

In one example, when determining the number of different frequency values adopted by the sub-modulation signal, the number of different frequency values adopted by the sub-modulation signal may be determined according to the number of images imaged in the first time. That is, the number of different frequency values is proportional to the number of pre-imaged images. For example, in the compression sampling application, when the user wishes to obtain multiple images in the first time, multiple different frequencies can be set, for example, 4 or more than 4 frequencies. When the user wishes to obtain fewer imaging images in the first time, fewer different frequencies can be set, such as 3 or less than 3.

In addition, in one example, since the positions of the sub-modulation units in the spatial light modulator are different, in one example, when determining the frequency parameter of the sub-modulation signal, it is also possible to first determine that the sub-modulation units are in the spatial light modulator position, the frequency and/or phase of the sub-modulation unit is determined based on the position. Referring to FIG. 3 , a plurality of sub-modulation units 211 in the spatial light modulator 210 are distinguished by X1 - X16 , and they are distributed in different positions of the spatial light modulator 210 .

In one example, the modulation signal of each sub-modulation unit in all the sub-modulation units in the spatial light modulator adopts the same frequency and may have different phases. For example, all sub-modulation signals including X1-X16 have the same frequency. At least two of all sub-modulation signals including X1-X16 are different in phase.

In one example, at least two of the plurality of sub-modulation units in the spatial light modulator employ different frequencies.

For example, a plurality of sub-modulation units of the spatial light modulator may be divided into a plurality of groups, all sub-modulation units in each group of sub-modulation units are located adjacent to each other in the spatial light modulator, and each group includes at least two sub-modulation units. For example, each group includes 2 sub-modulation units, 3 sub-modulation units, 4 sub-modulation units, 9 sub-modulation units, 16 sub-modulation units and so on. Then, each sub-modulation unit in the group of sub-modulation units is determined according to one or more factors of information such as the group of each group, the position of the group in the spatial light modulator, and the position of each sub-modulation unit in the group. The frequency and phase of the cell's modulating signal. For example, the frequency values of each group of sub-modulation signals are the same, and the frequency values of each group of sub-modulation signals are different from the frequency values of other adjacent groups of sub-modulation units. In addition, the phase values of each group of sub-modulation signals may be different. Taking the 16 sub-modulation units X1-X16 in FIG. 3 as an example, referring to FIG. 3, the 16 sub-modulation units X1-X16 can be divided into four groups, namely X1-X4, X5-X8, X9-X12, X13-X16. X1-X4 can use the same frequency f1 and use different phases 0, π, π/2, 3π/2. X5-X8 can use the same frequency f2 and use different phases 0, π, π/2, 3π/2. X9-X12 can use the same frequency f3 and use different phases 0, π, π/2, 3π/2. X13-X16 use the same frequency f4 and use different phases 0, π, π/2, 3π/2. f1, f2, f3 and f4 are different from each other.

Of course, according to the different information the user wants to obtain from the target scene, the frequency value of each group of sub-modulation signals can also be set to be the same as the frequency values of the sub-modulation signals of other adjacent groups of sub-modulation units, and the phase of each group of sub-modulation signals different. Or the frequency values of each group of sub-modulation signals are also different, and so on.

In one example, the information that the user wants to obtain from the target scene, or the type of the pre-collected optical signal, is pre-determined, based on the information that the user wants to obtain from the target scene, or the parameters of the pre-collected optical signal, Determine the frequency quantity and/or frequency value in the frequency parameter of the sub-modulation signal of the sub-modulation unit. Here, the information to be obtained by the user from the target scene may be related to the optical signal pre-collected by the user.

For example, when a user processes and collects a moving target scene, he wishes to compress and sample the moving scene, and he wishes to obtain a continuously changing natural image sequence. That is to say, the acquired intensity value of each pixel point of the target scene is a continuously changing time domain waveform. The time domain waveform is sparse in the frequency domain, only a few spectral components have large non-zero values, while most spectral components have small values close to zero. In order to perform compressive sampling on the target scene, these smaller values can be discarded in signal processing to achieve compressive sampling. In order to discard these spectral components with small brightness values, that is to say, in order to collect only spectral components with large brightness values in the subsequent acquisition process, because in most real scenes, the points with large brightness values correspond to Spectral components are concentrated in the low-frequency region. Therefore, in an example, some frequencies can be selected from the low-frequency region as the frequency parameters of the modulating signal, and the optical signal from the target scene can be modulated, so that only the spectrum in the low-frequency region can be collected to achieve compression. sampling.

In one example, the frequency value of the frequency used by the modulation signal used for the compressed sampling may start from 0 and gradually increase upward. Its frequency interval, that is, the increment step size, may be the reciprocal of the first time, or less than the reciprocal. Additionally, the spacing between all adjacent frequencies may be the same. The first time may be, for example, the exposure time of a camera, an image detector, etc. as a signal acquisition device.

Furthermore, in one example, the number of frequencies may be determined based on the number of images imaged in a first time that is related to or the same as the exposure time of the signal acquisition device. For example, when using the signal acquisition and processing method of the present disclosure to perform near-compressed sampling of the target scene, the number of frequencies used for modulating the signal may be set according to the compression ratio of the signal compression sampling performed by the user. The number of frequencies used determines the compression ratio of the video signal. The smaller the number of frequencies used, the greater the signal compression ratio and the correspondingly fewer images are imaged. The higher the number of frequencies used, the lower the compression ratio of the video signal and the more images are imaged. In addition, different numbers of frequencies can be selected in combination with the complexity of the target scene, the number of moving objects in the target scene, the motion mode, and the motion parameters, which can achieve a better compression ratio trade-off for compressed sampling.

For another example, by processing and collecting the target scene, the user wishes to obtain the motion trajectory of the moving object in the target scene. An image detector as an optical signal acquisition device includes a plurality of detection units, each detection unit corresponds to a pixel point of the collected data. When the object moves in space, when the moving object appears, the brightness value of the pixel point of a certain detection unit of the image detector will change, which is shown as the horizontal axis corresponding to the pixel point is time, vertical axis A pulse signal is generated on the time domain waveform of the pixel brightness value. According to the different times when the moving object appears at different pixel points, the times when the pulse signals appear on the time domain waveform of these pixel points are different, and the corresponding frequency domain is different in phase. Therefore, in this case, the phases of all sub-modulated signals can be different. For example, in order to avoid phase entanglement, in one exposure time, the phase variation range of the frequency of the modulation signal is in the range of 0-2π, and different moments correspond to different phases one-to-one. In addition, the frequency of all sub-modulation signals can be set to be the same, for example, the frequency can also be equal to or less than the reciprocal of the exposure time. You can also set the frequency of each group of sub-modulation signals to be the same, and there are differences between groups. In this way, only the motion trajectory and the phase distribution of the motion trajectory at different time points can be collected in step S102, without collecting other information.

Since the frequency and phase parameters of the modulated signal are set to take values within a certain value or a certain range, the motion trajectory information in the target scene can be directly obtained from the collected data without imaging the target scene as in the prior art. It can obtain multiple image sequences and extract motion trajectories from the image sequences, which greatly improves the processing speed and processing efficiency of trajectory detection.

Also for example, according to the information the user wants to obtain from the target scene, the value of the sub-modulation signal can be set to include 0 or not include 0. For example, when the optical signal the user wants to collect is the background signal in the target scene, since the spectrum of the background information does not have high-frequency components and only has a value at the DC component, the frequency parameter can be set to 0, and the collected data obtained in this way as the background image. When the light signal the user wants to collect is the foreground information after removing the background signal. Similarly, the frequency parameter can also be set to a frequency other than 0, and the acquired data obtained in this way are information from which background information has been removed. If the information that the user wishes to obtain from the target scene may include background information, the frequency parameter of the sub-modulation signal may include 0.

Also, for example, when the target scene includes moving objects (including brightness-changing objects), when the frequency parameter of the sub-modulation signal is determined, in addition to the factors mentioned in the example of determining the modulation signal in the previous embodiment, the motion in the target scene can also be determined. The motion parameter of the object, based on the motion parameter or a combination of the motion parameter and one or more factors mentioned in the foregoing embodiments, respectively determines the frequency parameter of the sub-modulation signal of the sub-modulation unit, such as frequency quantity and/or frequency value. The frequency parameters of all the sub-modulation signals may be the same or different, and some frequency parameters may be the same and some frequency parameters may be different. In one example, the user wishes to perform target recognition on a specific target in the target scene. Since the time-domain waveforms of targets with different textures and moving speeds are often very different, the frequency spectrum is also very different. The spectral distribution is the result of the joint action of various parameters of multiple moving objects. A changing physical quantity results in a change in the spectral composition. For example, there is a surge in intensity at a frequency component that is otherwise weak. Therefore, the modulated signal adopts these frequency values as frequency parameters to realize the detection of the specific moving object. In order to avoid identification errors, the frequency value of the modulated signal can also be adjusted appropriately, for example, it can be a frequency range including the above frequency value.

In one example, the motion parameters of the moving object include motion speed. The brightness change parameter of the brightness change object includes the brightness change speed. In this way, when the frequency value is determined according to the motion parameter, the time value of the moving object passing through a detection unit of the optical signal acquisition device, such as an image detector, can be determined according to the motion speed or the brightness change speed, and then the frequency value is determined according to the time value. The above-mentioned time value may be one time value, or may be multiple time values. Likewise, the above-mentioned frequency value corresponds to the time value, and may be one frequency value or multiple frequency values to form a frequency distribution. The frequency value is related to the time value, eg, the frequency value is, for example, the reciprocal of the time value or less. If the motion parameter also includes motion acceleration, or the brightness change parameter also includes change acceleration, different speeds of the moving object at different times can also be determined according to the acceleration and the initial motion speed.

According to the obtained multiple speeds, multiple time values of the moving object passing through a detection unit of the optical signal acquisition device are determined. Similarly, for a brightness-changing object, multiple brightness-changing speeds of the brightness-changing object can be determined according to the brightness-changing acceleration and initial changing speed, and multiple brightness-changing speeds of the brightness-changing object passing through a detection unit of the optical signal acquisition device can be determined according to the multiple brightness changing speeds. time value. The frequency value is thus determined from the time value. For example, the frequency value is the inverse of the time value.

In addition, according to the embodiment of the present disclosure, the determination of the phase parameter of the sub-modulation signal may be related to the frequency and/or the sub-modulation unit group. For example, according to the grouped sub-modulation units mentioned in the foregoing embodiments, modulation signals of a group of sub-modulation units may be set to have different phase values. In order to avoid the phase winding problem, the phase distribution of the modulation signals of the sub-modulation units is a plurality of different phases, such as 3, 4 or more than 4, which can be in the range of 0-2π. During one exposure time of the image detector, the phase distribution corresponding to a detection unit of the image detector is 0-2π, which can avoid the problem of phase winding, so that the moment when the moving object appears corresponds to the phase in the frequency domain one by one. Ambiguous values will appear.

FIG. 4 shows a schematic diagram of another signal acquisition and processing apparatus according to an embodiment of the present disclosure. In order to project the light signal from the target scene onto the spatial light modulator more accurately, referring to FIG. 4 , in one embodiment, the signal The acquisition and processing device 400 may include a first optical element 430 in addition to the signal processing device in all the foregoing embodiments, such as the spatial light modulator 410 , and the signal acquisition device, such as the image detector 420 . Then, the optical signal from the target scene S can be projected onto the spatial light modulator 410 after passing through the first optical element 430, and the spatial light modulator 410 can receive the optical signal projected onto it after passing through the first optical element 430. modulation. The first optical element may be one optical element or a group of optical elements. For example, one or more of lenses, lens groups, prisms, mirrors, optical fibers, etc. may be included for transmitting the light path or imaging. In one example, the first optical element 430 can project the light signal from the target scene S onto the spatial light modulator 410 , and can also image on the spatial light modulator 410 . The first optical element can adjust the light path so that the light signal from the target scene is more accurately projected onto the spatial light modulator.

The method and method for performing the first processing on the optical signal from the target scene according to the implementation of the present disclosure are described above, and the method for collecting the first processed optical signal is further described below.

In S102, the first processed optical signal is collected. In the signal collection and processing device, the signal collection device collects the first processed optical signal.

Refer to the signal acquisition and processing device 400 in FIG. 4 . In the signal acquisition and processing device 400, the signal acquisition device may be an image detector 420, a charge-coupled unit (CCD), a camera, or other device capable of forming a pixel lattice. When the signal processing device is the spatial light modulator 410, then, in step S102, collecting the first processed optical signal includes: projecting the optical signal modulated by the spatial light modulator 410 to the image detector 420, and then The image detector 420 collects the modulated optical signal.

The data collected by the signal collection device may be a one-dimensional or two-dimensional pixel lattice, for example, a pixel lattice formed by all sub-detection units on the image detector converting the received modulated optical signals into electrical signals. Each pixel has its own pixel value, including luminance and chrominance values and other information. Each pixel contains the information of a certain position, a certain frequency, a certain phase of the modulated optical signal, or a combination of various kinds of information. Figure 5 shows a schematic diagram of the target scene and the collected data. Referring to FIG. 5 , the picture on the left is the target scene, the picture in the middle is the pixel array of the collected data, and the picture on the right is the enlarged view Y1-Y16 of a part of the pixel lattice as an example. These collected pixel value points can be directly used as the information from the target scene, or can be further processed in the follow-up to obtain more information from the target scene.

In this disclosure, an image detector is used as an example for description. Other signal acquisition devices work in the same or similar manner.

The image detector may include a plurality of detection units, and in the embodiment of the present disclosure, each detection unit corresponds to one or more of the sub-modulation units of the spatial light modulator. That is, the modulated optical signal of one sub-modulation unit or a plurality of sub-modulation units is detected by one sub-detector of the image detection unit. Of course, one or more sub-detection units may also correspond to one sub-modulation unit of the spatial light modulator. That is, the relationship between the two is many-to-one or one-to-many. The sub-detection unit of the image detector collects the optical signal modulated by the corresponding sub-modulation unit. In the image collected by the image detector, the corresponding pixel point of each sub-detection unit contains the information of the modulated optical signal at a certain position, a certain frequency, a certain phase, or a combination of various kinds of information. Each sub-detection unit corresponds to a pixel. Referring to the middle diagram of Fig. 5, the collected data includes multiple pixels, Y1-Y16 represent 16 pixels among the multiple pixels, and each pixel may correspond to a sub-modulation unit of the spatial light modulator, for example, Fig. 5 Y1-Y16 in Figure 3 correspond to X1-X16 in Figure 3, respectively.

In one example, the acquisition process may be limited to a certain time, eg, the encoded optical signal is acquired for a first time, the first time being related to the performance of the image detector. An example is the exposure time of the image detector. That is, the acquisition process is completed within the exposure time.

In order to accurately project the modulated optical signal onto the image detector. Referring to FIG. 4 , in one example, a second optical element 440 may be disposed between the spatial light modulator 410 and the image detector 420 . Likewise, the second optical element 440 may also be a single element or a combination of elements. For example, it may be one or more of optical elements including lenses, lens groups, plane mirrors, mirrors, optical fibers, and the like. In this way, the modulated optical signal of the spatial light modulator 410 may first pass through the second optical element 440 and then be further projected onto the image detector 420 for collection. In this way, the modulated light signal can be more accurately gathered on the image detector.

In the embodiment of the present disclosure, since the light signal of the target scene is processed first and then collected, the collected image is the information that the user needs to obtain, so the amount of data is greatly reduced. At the same time, the collected information contains more useful information than the information obtained by directly imaging the target scene. It records the information of the target scene in multiple frequency domains, avoiding the information loss caused by the low performance defect of the collection device. , reducing the performance requirements of the acquisition device, such as camera frame rate, transmission link bandwidth, storage space, etc. In addition, because the processing is performed in the optical domain, the algorithm can reach the speed of light.

The signal acquisition and processing method and apparatus according to the above embodiments of the present disclosure have been described above, and the signal acquisition and processing method and apparatus according to another embodiment of the present disclosure will be further described below.

FIG. 6 shows another signal acquisition and processing method according to an embodiment of the present disclosure. Referring to FIG. 6 , on the basis of all the foregoing embodiments and examples, the signal acquisition and processing method further includes step S103 , in which information in the target scene is obtained based on the acquired data. That is, in the signal acquisition and processing method shown in FIG. 6 , in S101 , the first processing is performed on the optical signal from the target scene. In S102, the first processed optical signal is collected. In S103, information in the target scene is obtained based on the collected data.

FIG. 7 shows a schematic diagram of a third signal acquisition and processing apparatus according to an embodiment of the present disclosure. The signal acquisition and processing method 600 in FIG. 6 corresponds to the signal acquisition and processing apparatus 700 shown in FIG. 7 . Referring to FIG. 7 , the signal acquisition and processing device 700 includes a signal processing device 710 , such as a spatial light modulator, a signal acquisition device 720 , such as an image detector, and an information obtaining device 730 . The information obtaining device 730 can be, for example, a computer, a microprocessor, a central processing unit, etc., which can be implemented in any one of three implementation manners of software, hardware, and firmware.

Then, the signal acquisition and processing method shown in FIG. 6 may be, for example, the signal processing device 710 performs first processing on the optical signal from the target scene S, the signal acquisition device 720 acquires the optical signal after the first processing, and the information is obtained The device 730 obtains the information in the target scene based on the collected data.

That is to say, after the processed optical signal is collected, information in the target scene is also obtained based on the collected data. The obtained information in the target scene may include, for example, an imaging image of the entire target scene, an image of a part of the target scene, an image of one or more objects, an image at a certain point in time, an image of the target scene after other processing, and an image of an object. Motion trajectory, information of a certain point or multiple points, background information, foreground information, etc.

In one example, a second process is performed on the collected data to obtain information in the target scene, and the obtained information is formed into an image. Images include one image or multiple images, such as pictures and video sequences. In addition, the information in the target scene can also be displayed in other ways. For example, the form of waveform, pixel value distribution, etc.

It can be known from the foregoing embodiments that the data collected in step S102 is that all sub-detection units on the image detector convert the received optical signals into electrical signals, and form pixels, each of which has its own pixel. value, i.e. luminance value and/or chrominance value, etc. Each pixel contains the information of a certain position, a certain frequency, a certain phase of the modulated optical signal or a combination of these information.

Since the process of acquiring the modulated optical signal by the image detector is completed within a period of time, for example, within the exposure time of the image detector, different image detectors have different exposure times T, such as T=0.01 second. Each of the above-mentioned pixel points includes a combination of multiple pieces of information of the modulated optical signal at multiple time points within the exposure time period. Since the optical signal from the target scene is modulated before, the embodiment of the present disclosure can recover the information of the target scene at a certain time point in the exposure time from the collected combined information.

Figure 8 shows a comparison of images obtained by different approaches. That is, a contrast map of the imaged image of the image detector during the exposure time and the imaged image at a certain point in time recovered by an embodiment of the present disclosure. Referring to Figure 8, the upper left image, that is, Figure 8-1, is the target scene, the lower left image, that is, Figure 8-2, is the imaging image of the image detector during the exposure time, and the 3 images on the right, that is, Figure 8- 3, Figures 8-4, and Figures 8-5 are imaging images of three different time points t=6ms, t=60ms, and t=100ms in the exposure time recovered by the embodiment of the present disclosure. It can be clearly seen that the image recovered by the embodiment of the present disclosure is clearer than the image obtained by the normal photographing of the image detector, and the detailed information of the image can be obtained.

In one example, a time-domain waveform diagram of each pixel in the acquired data during the exposure time is obtained separately, so as to obtain information in the target scene. The following description takes one pixel as an example. Figure 9 shows a time domain waveform diagram of a pixel during exposure time. The time domain waveform diagram of the pixel point is random, for example, it can be a sine waveform, a cosine waveform or other waveforms and so on. The waveform diagram in FIG. 9 is only a schematic diagram, wherein the abscissa represents the time parameter t, whose value range is 0-T, and T is the exposure time of the image detector; the ordinate represents the pixel value of the pixel at different times, such as brightness value. Since the target scene may include moving objects or objects with changes in brightness, such as people blinking their eyes when taking pictures, or scenes of cars driving fast, the brightness value of the same pixel at each time point may be different. Obtain the change of the brightness value of a pixel in the exposure time.

In the same way, the time domain waveform corresponding to each other pixel point in the data collected by the image detector is obtained. Similarly, the pixel values of all the pixels at a certain time point can also be obtained, so that the scene information of the time point can be recovered according to the pixel values of all the pixel points.

In order to obtain the time-domain waveform of one pixel in the collected data, according to an embodiment of the present disclosure, scene information can be recovered in units of image detector sub-detection units corresponding to multiple sub-modulation units of the spatial light modulator. For example, the sub-modulation units are divided into multiple groups, and the scene information is restored by taking the pixel points of the sub-detection units corresponding to each group of sub-modulation units as a unit. For another example, the restoration may also be performed in units of pixel points of sub-detection units corresponding to multiple groups of sub-modulation units. The more groups in the group of sub-modulation units in the unit, the smaller the resolution of the recovered image. The fewer the groups of sub-modulation units in the unit, the greater the resolution of the recovered image. The following description will be given by taking each pixel Y1-Y16 of the sub-detection unit corresponding to the sub-modulation units X1-X16 in FIG. 3 as an example.

As shown in Figure 5, the Y1-Y16 pixel point group is close in space and approximately corresponds to the same position of the object. Therefore, the information of the corresponding position in the target scene can be obtained in units of Y1-Y16, such as obtaining the corresponding position in the target scene. The brightness value P1. In addition, the chromaticity value of the pixel can be obtained by a color image sensor. In an example, since the target scene position corresponding to Y1-Y16 may include multiple pixel points, the luminance values of the multiple pixel points at the position may all be set to the luminance value P1. In another example, it is also possible to set the brightness values of multiple pixels at this position of the target scene to be related to P1 according to prior data. For example, it is a value obtained by performing various processes such as filtering and smoothing by P1. In this way, by performing the above operations on the pixel point groups of the sub-detection units corresponding to each group of sub-modulation units, information of each position corresponding to the target scene can be obtained to form an image.

The following is an example of obtaining the luminance value P1 from Y1-Y16.

In an example, in order to obtain the information in the target scene from the collected data Y1-Y16, such as the brightness value P1, the coded signal corresponding to the position of the target scene can be obtained first, and then the collected data can be analyzed according to the coded signal . For example, the modulation signals of the sub-modulation units X1-X16 corresponding to Y1-Y16 are acquired. The frequency parameter in each sub-modulation signal is obtained as the first parameter of data analysis. In addition, the second parameter can also be obtained based on the collected data Y1-Y16. After that, based on the above-mentioned first and second parameters, information in the target scene is obtained.

In one example, the first parameter may be acquired in units of, for example, a group of a plurality of sub-modulation units of the aforementioned spatial light modulator. For example, as described in the foregoing embodiments, the sub-modulation units X1-X16 can also be divided into four groups, such as X1-X4, X5-X8, X9-X12, X13-X16. The frequency parameters of the modulation signals of the sub-modulation units in each group are the same, for example, X1-X4 can use the same frequency f1. X5-X8 can use the same frequency f2. X9-X12 can use the same frequency f3. X13-X16 use the same frequency f4, and one or more of the frequency parameters fl, f2, f3 and f4 of each group may be used as the first parameter.

In one example, the collected data includes a plurality of pixel points, eg, Y1-Y16. The brightness information of the pixel can be obtained from each pixel. The plurality of pixel points collected by the detection unit corresponding to a group of sub-modulation units may be regarded as a pixel point group, and the second parameter may be determined based on each group of pixel points. For example, sub-modulation units X1-X16 are divided into four groups, X1-X4, X5-X8, X9-X12, X13-X16, Y1-Y16 can be divided into four groups Y1-Y4, Y5-Y8, Y9-Y12 , Y13-Y16. The second parameter is then determined based on the pixel values of each pixel point group.

In one example, the second parameter may be calculated according to pixel values of all pixels in each pixel group. For example, for the pixel values of all pixel points in each pixel point group, the second parameter is obtained by adopting a four-phase shift recovery algorithm. The second parameter can be one or more.

In one example, a third parameter may also be obtained, and the third parameter may be a phase parameter in each sub-modulation signal. The second parameter is determined based on the third parameter and a plurality of pixel points collected by the detection unit corresponding to a group of sub-modulation units. For example, a quadrature phase shift recovery algorithm is performed based on the third parameter to obtain the second parameter.

According to the second parameter obtained from each pixel point group and the first parameter obtained from the encoded information, the frequency spectrum of the target scene at the position corresponding to the above-mentioned pixel point group can be obtained.

In an example, the first parameter and the second parameter may be used as parameters, and inverse Fourier transform may be performed on a certain part of the collected data to obtain the time domain waveform of the target scene at the corresponding position. For example, as shown in the time domain waveform shown in FIG. 9 , in the time domain waveform, the luminance value L of the pixel point at the corresponding position in the target scene at different times t in the corresponding exposure time is displayed. In this way, the luminance value of each position of the target scene at each time point is obtained in the same way, and an image can be formed.

In one example, if the target scene includes moving objects (including objects with changes in brightness), then a plurality of images with changes can be recovered from the collected data. For example, when the user wishes to acquire information about the target scene within a predetermined time, for example, within one exposure of the image detector, that is, within one shooting time, then a single image obtained by the image detector during normal photography can be obtained. Multiple images of moving objects in the target scene recovered from exposure time change.

Because in the prior art, limited by the performance index of the shooting camera, such as the exposure time of the camera, when shooting a moving object, a virtual image is often shot within the exposure time, and the details of the scene cannot be seen clearly. According to the embodiments of the present disclosure, since the light signal from the target scene is effectively processed before it is collected, multiple detailed images within the camera exposure time can be obtained. As shown in Figure 8, 8-1 on the left is the target scene, and 8-2 is a single image obtained by the image detector during normal photography, that is to say, the image detector does not perform any processing on the pre-collected data. The captured images, Figures 8-3, 8-4, and 8-5 on the right are three pieces of image information of the target scene at different time points obtained by the signal acquisition device after the first processing by the signal processing device. It can be seen from the comparison that with the method of the embodiment of the present disclosure, when an ordinary camera is imaging, generally only a blurred virtual image can be obtained for a fast-moving object, while the image recovered by the embodiment of the present disclosure is especially for the imaging of a fast-moving object. , the detailed information at different time points can be recovered. Therefore, the embodiment of the present disclosure can improve the imaging quality and obtain the detailed information of the object in the target scene without changing the existing image acquisition device. And because the processing process is optical signal processing, the processing speed is super fast and can reach the standard of the speed of light.

In this embodiment of the present disclosure, according to different information that the user wants to acquire from the target scene, in step S101 , the frequency parameters and phase parameters of the modulation signals of each group of sub-modulation units are preset. In this way, in step S103, the user can obtain different information in the target scene from the collected data. Alternatively, in the signal acquisition and processing device, the signal processing device presets the frequency parameters and phase parameters of the modulated signals of each group of sub-modulation units; then, the signal information obtaining device can obtain different information in the target scene from the collected data. That is, the embodiments of the present disclosure can be applied to different technical fields according to user requirements.

In one example, the user wishes to compress sample the target scene. The target scene may include moving objects, such as a moving car as shown in the upper left image in Figure 8 . After the target scene is compressed and sampled in this way, in the multiple sampled images obtained at different time points, the intensity value of the pixel point corresponding to the same position of the target scene is a continuous time domain waveform within a certain time T, such as The time domain waveform shown in Figure 9. In FIG. 9, the abscissa represents time t, the ordinate represents the intensity value L of the pixel point, and the waveform represents the change of the luminance value of a certain pixel point at different times t. In this way, the image formed by all the pixel points is a continuously changing natural image sequence formed at different time points within the above-mentioned time T.

Since the above-mentioned time domain waveform is sparse in the frequency domain, that is, only a few spectral components have large non-zero values, while most spectral components are small values close to zero, therefore, in S101, the signal processing device When the light signal of the scene is subjected to the first processing, these smaller values can be discarded to implement compressed sampling (video compression). For example, by setting the frequency parameter and the phase parameter of the encoded signal according to the above analysis during the first processing in step S101, in S102, the signal acquisition device only collects spectral components with a larger luminance value. In S103, the information obtaining device can directly obtain the compressed data. For example, in step S101 , the signal processing apparatus selects some frequencies from the low-frequency region as frequency parameters of the modulated signal, and modulates the optical signal from the target scene. For another example, when using the signal acquisition and processing method of the present disclosure to perform near-compressed sampling of the target scene, the number of frequencies used for modulating the signal may also be set according to the compression ratio of the signal compression sampling performed by the user. The number of frequencies used determines the compression ratio of the video signal. The smaller the number of frequencies used, the higher the signal compression ratio; the higher the number of frequencies used, the lower the video signal compression ratio.

In one example, the user wishes to detect the trajectories of moving objects in the target scene. When an object moves in space, the time when the object passes through different sub-detection units of the image detector is different, so different sub-detection units of the image detector can capture the object at different times. Each sub-detection unit has different brightness values corresponding to the pixel points at different time points, so that for each pixel point, a time domain waveform can be generated according to the time point and the pixel point brightness value. These pixels appear at different times in the time domain waveform of the pulse signal, which correspond to different phases in the frequency domain. In the present disclosure, in step S101, the signal processing device may perform first processing on the light signal from the target scene through the spatial light modulator, for example, the pixel point corresponding to the sub-detection unit of the image detector, and the encoded signal is of the same frequency. A cosine signal whose frequency is the reciprocal of the image detector exposure time or greater. In addition, in one exposure time, the phase distribution of the same pixel is 0-2π. In this way, in step S103, the information obtaining device may obtain the moments when the moving objects appear at different positions in the target scene according to the collected data. Thus, the motion trajectory of the moving object can be directly obtained. The embodiments of the present disclosure can directly obtain trajectory information from the target scene, without the need to collect multiple image sequences of the target scene as in the prior art, and then perform trajectory detection from the multiple image sequences. That is to say, according to the data collected by the signal collecting device in step S102, in step S103, the information obtaining device can directly obtain the image information in the target scene as long as the inverse Fourier transform is performed once, avoiding the need for the prior art. The process of reconstructing the video image and then processing it is simpler and easier, and the image forming efficiency is significantly improved.

In one embodiment, the user wishes to remove the background in the target scene. In general, stationary objects, environments, etc. can be considered as backgrounds. The user is interested in the portraits and objects in the front section, including moving objects. The background is often used as an interference item, and the user hopes to remove it through the background removal algorithm. In the embodiment of the present disclosure, considering that the time domain waveform of the background information is stable, it can be regarded as a constant that does not change with time. After the Fourier transform of the background time-domain waveform, there is no high-frequency component in the spectrum, and only has a value at the DC component. Therefore, in the disclosure, the direct current component is not collected in the encoded signal of the signal processing device in step S101. For example, in the encoded signal, the frequency of f=0 is not used as the modulation signal, and the modulation signals of all sub-modulation units are cosine functions of f≠0. In this way, in step S102, no DC component is collected. Since the DC component is not acquired, the background information is not captured by the image detector. In step S103, according to the collected data, the information obtaining device may directly obtain an image or image sequence from which the background has been removed.

In one example, the user wishes to perform object recognition on the target scene. The target mentioned here can be a moving object or an object that does not move but changes in brightness, such as a neon light. The time-domain waveforms of targets with different textures and moving speeds are often very different, resulting in large differences in their frequency spectra. The spectral distribution is the result of the combined action of the above-mentioned physical quantities. A changing physical quantity results in a change in the spectral composition. For example, there is a surge in intensity at a frequency component that is otherwise weak. Therefore, the frequency related to these moving objects or brightness-changing objects is used in encoding, and the detection of the specific moving object can be realized. For example, the spectral bandwidth of a high-speed moving object will be much larger than that of a slow-moving object. In order to detect a specific target (for example, a specific moving object) in the target scene of the present disclosure, a specific frequency parameter can be used when setting the modulation signal, so as to obtain only the target image from the target scene and realize the target recognition function.

For example, the motion law of the object of interest can be analyzed in advance to obtain the frequency spectrum of the object of interest. The motion law may include, for example, texture information, velocity information, and acceleration information of the object. These physical quantities can be reflected in the distribution of time-domain waveforms in the frequency spectrum of different pixel points corresponding to the image detector.

In an example, the target scene includes a moving object or a brightness-changing object, then in step S101, the signal processing apparatus may determine the modulation signal according to at least one motion parameter of the moving object, or according to the brightness-changing parameter of the brightness-changing object. at least one frequency parameter, and then determining the modulation signal based on the at least one frequency parameter.

For example, the frequency value of the frequency parameter of the modulation signal may be one or more frequency values determined according to the above-mentioned motion parameter or brightness change parameter. In order to avoid identification errors, the frequency value of the modulation signal can also be adjusted appropriately, for example, it can be a frequency range including the above-determined frequency value.

In one example, the motion parameters of the moving object include motion speed. The brightness change parameter of the brightness change object includes the brightness change speed. In this way, when the frequency value is determined according to the motion parameter, the time value of the moving object passing through a detection unit of the optical signal acquisition device can be determined according to the motion speed or the brightness change speed, and then the frequency is determined according to the time value. If the motion parameter also includes motion acceleration, or the brightness change parameter also includes change acceleration, different speeds of the moving object at different times can also be determined according to the acceleration and the initial motion speed. According to the obtained multiple speeds, multiple time values of the moving object passing through a detection unit of the optical signal acquisition device are determined. Similarly, for a brightness-changing object, multiple brightness-changing speeds of the brightness-changing object can be determined according to the brightness-changing acceleration and initial changing speed, and multiple brightness-changing speeds of the brightness-changing object passing through a detection unit of the optical signal acquisition device can be determined according to the multiple brightness changing speeds. time value. For example, the above time value may be one or more non-zero time values, and the corresponding frequency value may have only one non-zero value, or may have multiple non-zero values.

In this way, after the frequency parameter of the modulated signal is determined according to the property of the moving object, the signal processing apparatus may set the encoded signal in step S101, and encode the optical signal from the target scene according to the set encoded signal. In this way, in step S102, non-target data in the target scene will not be collected into the image detector. In step S103, the information obtained by the information obtaining device according to the collected data only includes the image information of the specific target desired by the user, thereby realizing target recognition.

Similarly, in the embodiment of the present disclosure, by modulating the optical signal of the target scene, the collection and detection of a specific target in the target scene can be realized, which improves the processing speed and effectively reduces the amount of calculation.

The specific embodiments described above further describe the purpose, technical solutions and beneficial effects of the present disclosure in detail. It should be understood that the above-mentioned specific embodiments are only specific embodiments of the present disclosure, and are not intended to limit the present disclosure. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure should be included within the protection scope of the present disclosure.

Claims (10)

1. A signal acquisition and processing method, comprising: performing first processing on the optical signal from the target scene; Collecting the optical signal after the first processing. 2. The method of claim 1, further comprising: obtaining information in the target scene based on the collected data. 3. The method according to claim 2, wherein the obtaining the information in the target scene based on the collected data comprises: performing second processing on the collected data to obtain information in the target scene; The obtained information is formed into an image. 4. The method according to any one of claims 1-3, wherein, The first processing of the optical signal from the target scene includes: determining the encoded signal of the target scene; The optical signal from the target scene is encoded based on the encoded signal, and the encoded signal is an optical signal. 5. The method of claim 4, wherein the collecting the first processed optical signal comprises: Collecting the encoded optical signal, where the encoded optical signal includes information of the encoded signal and an optical signal from the target scene. 6 . The method according to claim 5 , wherein the encoded optical signal is an integration result of multiplying the encoded signal and the optical signal from the target scene. 7 . 7. The method of claim 4, wherein performing the first processing on the optical signal from the target scene further comprises: projecting the light signal from the target scene to a spatial light modulator; The encoding signal for determining the target scene includes: determining the modulation signal of the spatial light modulator; The encoding processing on the optical signal from the target scene based on the encoded signal includes: The optical signal from the target scene is modulated based on the modulation signal of the spatial light modulator. 8. The method of claim 7, wherein the modulation signal includes a frequency parameter and a phase parameter, and the determining the modulation signal of the spatial light modulator comprises: determining the frequency parameter of the modulated signal; determining the phase parameter of the modulated signal; The modulation signal is determined based on the frequency parameter and the phase parameter. 9. The method of claim 8, wherein determining the frequency parameter of the modulated signal comprises: determining the properties and/or types of pre-acquired optical signals, Based on properties and/or types of pre-collected optical signals, frequency parameters of the modulated signal are determined. 10. The method of claim 8 or 9, wherein determining the frequency parameter of the modulated signal comprises: determining the complexity of the target scene; A frequency parameter of the modulated signal is determined based on the complexity.

Images