CN114302081A - Motion detection circuit - Google Patents
Motion detection circuit Download PDFInfo
- Publication number
- CN114302081A CN114302081A CN202111678542.0A CN202111678542A CN114302081A CN 114302081 A CN114302081 A CN 114302081A CN 202111678542 A CN202111678542 A CN 202111678542A CN 114302081 A CN114302081 A CN 114302081A
- Authority
- CN
- China
- Prior art keywords
- difference
- switch
- signal
- pixel
- capacitor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Compression Or Coding Systems Of Tv Signals (AREA)
- Image Analysis (AREA)
Abstract
The invention provides a motion detection circuit, which comprises a pixel output module, a difference extraction module, a difference index amplification module and a difference comparison module, wherein the pixel output module is used for sequentially transmitting pixel signals of adjacent frames to the difference extraction module; the difference extraction module is used for extracting the difference of pixel signals of adjacent frames to obtain the signal difference of the pixels; the difference exponential amplification module is used for carrying out exponential amplification operation on the signal difference to obtain a pixel difference signal; the difference comparison module is used for comparing the pixel difference signal with the first common-mode signal to output a comparison result, and judging whether a target pixel corresponding to the pixel difference signal is in a motion state or not according to the comparison result. The fine difference signal can be amplified to facilitate the capture of fine moving object change signals, and the precision of motion detection is increased; the difference signal of any two frame signals can be obtained, and the precision of motion detection is further improved; the motion detection efficiency is improved, and the detection cost is saved.
Description
Technical Field
The invention relates to the technical field of integrated circuits, in particular to a motion detection circuit.
Background
With the development of CMOS integrated circuit technology, electronic products are applied more and more widely in daily life, and become an indispensable part of various fields. Along with the rapid development of the artificial intelligence algorithm, the intelligent application of the current electronic products is rapidly popularized and realized, and the use requirements of the intelligent image sensor are more and more extensive. In an intelligent image sensor, an important application requirement is to detect the motion state of an image, so as to perform a series of intelligent applications such as motion model analysis, moving object behavior prejudgment, corresponding emergency measures and the like.
In the technical field of the current image sensor, the detection of a moving object compares two frames of image data of the image sensor, detects whether the two frames of data have difference, and judges whether the object is in a moving state. In the current image sensor motion detection method, digital signals output by two frames of images are compared, but all pixel data of each frame of image must be processed by analog-to-digital conversion of an analog-to-digital converter each time, the reading time of a circuit is limited by the conversion time of the analog-to-digital converter, the achievable maximum frame rate of the image sensor is reduced, and the time required by motion detection is longer. Meanwhile, in the current method for comparing digital signals by motion detection, no matter the method is realized in a chip or is realized by adding an Image Signal Processing (ISP) outside the chip, extra area and power consumption resource overhead are needed, and the system cost is increased.
Chinese patent publication CN 110870297 a discloses on-die motion detection for CMOS image sensors using a grid relationship between pixels, comprising a plurality of analog comparators and a two-dimensional pixel array comprising a plurality of rows of pixels and a plurality of columns of pixels. Each pixel is configured to convert an optical signal on the pixel to an analog signal. The two-dimensional array of pixels is organized into a plurality of groups of pixels, each group of pixels being associated with a combined group signal determined based on the analog signals from pixels in the group of pixels. Each analog comparator includes two inputs and is operable to compare combined group signals generated by two groups of pixels of the plurality of groups of pixels during a same time period to generate a one-bit inter-pixel digital signal, wherein each of the two groups of pixels is coupled to a corresponding one of the two inputs of the each analog comparator. This patent has used a plurality of analog comparator, and area occupied is great, has increased image sensor's manufacturing cost.
Therefore, it is necessary to provide a motion detection circuit to solve the above-mentioned problems in the prior art.
Disclosure of Invention
The invention aims to provide a motion detection circuit, which aims to solve the problems that the motion detection time of an image sensor in the prior art is long and the cost is increased.
In order to achieve the above object, the motion detection circuit of the present invention includes a pixel output module, a difference processing module, and a difference comparison module, where the difference extraction module includes a difference extraction module and a difference index amplification module, an input end of the difference extraction module is connected to an output end of the pixel output module, an output end of the difference extraction module is connected to an input end of the difference index amplification module, an output end of the difference index amplification module is connected to a first input end of the difference comparison module, and a second input end of the difference comparison module is configured to receive a first common-mode signal;
the pixel output module is used for sequentially transmitting a plurality of continuous adjacent frame pixel signals to the difference extraction module;
the difference extraction module is used for extracting the difference of the pixel signals of the adjacent frames to obtain the signal difference of the pixels;
the difference exponential amplification module is used for carrying out exponential amplification operation on the signal difference to obtain a pixel difference signal;
the difference comparison module is used for comparing the pixel difference signal with the first common-mode signal to output a comparison result, and judging whether a target pixel corresponding to the pixel difference signal is in a motion state or not according to the comparison result.
The motion detection circuit has the beneficial effects that:
the difference of the pixel signals of the adjacent frames is extracted through the difference extraction module to obtain the signal difference of the pixels, the difference index amplification module is used for carrying out exponential amplification operation on the signal difference to obtain pixel difference signals, and due to the difference signals, through exponential amplification, the fine difference signals can be amplified so as to be convenient for capturing fine moving object change signals, the signal difference between the pixels of the two adjacent frames of images can be more accurately acquired, and the precision of motion detection is increased; meanwhile, through the differential amplification of the two adjacent frame signals by exponential amplification, even if the signal of the previous frame is smaller than the signal of the next frame, the signal of the previous frame cannot be cut off, the differential signal of any two frame signals can be obtained, and the precision of motion detection is further improved; the difference comparison module is used for comparing the pixel difference signal with the first common-mode signal to output a comparison result, and judging whether a target pixel corresponding to the pixel difference signal is in a motion state or not according to the comparison result; because each pixel does not need to be subjected to analog-to-digital conversion, the analog-to-digital conversion time is saved, the motion detection efficiency is improved, the detection cost is saved, and the problems that the motion detection time of the image sensor in the prior art is long and the cost is increased are solved.
Optionally, the difference extraction module includes a first extraction unit and a second extraction unit, an input end of the first extraction unit and an input end of the second extraction unit are both connected to an output end of the pixel output module, and an output end of the first extraction unit and an output end of the second extraction unit are both connected to an input end of the difference exponential amplification module;
the first extraction unit collects continuous pixel signals from the Nth frame to the (N + M) th frame, wherein both N and M are positive integers, and the second extraction unit collects continuous pixel signals from the (N + 1) th frame to the (N + M) th frame;
the first extraction unit and the second extraction unit alternately acquire the difference of pixel signals of adjacent frames according to the continuous pixel signals from the Nth frame to the (N + M) th frame to obtain a first signal difference to an Mth signal difference, and respectively output the first signal difference to the Mth signal difference to the difference index amplification module. The image sensor has the advantages that the first extraction unit and the second extraction unit respectively extract pixel signals which are continuous according to the Nth frame to the (N + M) th frame, the difference of the pixel signals of adjacent frames is alternately obtained, so that the difference from the first signal difference to the M signal difference is obtained, the order of motion detection is embodied, the first extraction unit and the second extraction unit work in an alternate difference acquisition mode, the comparison of the difference signals of all continuous frames is realized, and the continuous motion detection of the whole image sensor is realized.
Optionally, the first extraction unit includes a first capacitor and a first switch control unit, and the first capacitor is connected to the first switch control unit;
the first switch control unit is used for controlling the first capacitor to be close to a second end of the difference exponential amplification module to output a difference value between the (N + 1) th frame pixel signal and the N frames pixel signal so as to obtain the first signal difference.
Optionally, the first switch control unit comprises a first switch, a second switch and a third switch;
the first end of the second switch close to the pixel output module is connected with the output end of the pixel output module, and the second end of the second switch is connected with the first end of the first capacitor;
the second end of the first capacitor is connected with the input end of the difference exponential amplification module;
two ends of the first switch are respectively grounded and connected with a node between the second end of the second switch and the first end of the first capacitor;
and two ends of the third switch are respectively connected with the first end of the second switch and the second end of the first capacitor.
Optionally, the second extraction unit includes a second capacitor and a second switch control unit, and the second switch control unit is connected to the second capacitor;
the second switch control unit is used for controlling the second capacitor to be close to a second end of the difference exponential amplification module to output a difference value between the (N + 2) th frame pixel signal and the (N + 1) th frame pixel signal so as to obtain a second signal difference.
Optionally, the second switch control unit comprises a fourth switch, a fifth switch and a sixth switch;
the first end of the fifth switch close to the pixel output module is connected with the output end of the pixel output module, and the second end of the fifth switch is connected with the first end of the first capacitor;
the second end of the second capacitor is connected with the input end of the difference exponential amplification module;
two ends of the sixth switch are respectively connected with the first end of the fifth switch and the second end of the second capacitor;
and two ends of the fourth switch are respectively grounded and connected with a node between the second end of the fifth switch and the first end of the second capacitor.
Optionally, when the pixel output module outputs an nth frame pixel signal, the second switch is closed, the first switch, the third switch, the fourth switch, the fifth switch and the sixth switch are all opened, and the first end of the first capacitor stores the nth frame pixel signal;
when the pixel output module outputs a pixel signal of an (N + 1) th frame, the third switch and the fifth switch are closed, the first switch, the second switch, the fourth switch and the sixth switch are opened, and the second end of the first capacitor and the first end of the second capacitor both store the pixel signal of the (N + 1) th frame;
and closing the first switch, and opening the second switch and the third switch, so that the second end signal of the first capacitor is converted into the difference value between the N +1 th frame pixel signal and the N frame pixel signal under the coupling action of the first capacitor. The pixel signal extraction method has the advantages that the first end of the first capacitor stores the pixel signal of the Nth frame, the second end of the first capacitor and the first end of the second capacitor store the pixel signal of the (N + 1) th frame, the second end of the first capacitor is converted into the difference value between the pixel signal of the (N + 1) th frame and the pixel signal of the N frame by controlling the switching states of the first switch, the second switch, the third switch, the fourth switch, the fifth switch and the sixth switch, and therefore the first extraction unit obtains the first signal difference.
Optionally, when the pixel output module outputs a pixel signal of an N +2 th frame, the second switch and the sixth switch are closed, the first switch, the third switch, the fourth switch and the fifth switch are all opened, the first end of the second capacitor stores the pixel signal of the N +1 th frame, and the second end of the second capacitor and the first end of the first capacitor store the pixel signal of the N +2 th frame;
and closing the fourth switch, and turning off the fifth switch and the sixth switch, so that a second end signal of the second capacitor is converted into a difference value between the pixel signal of the (N + 2) th frame and the pixel signal of the (N + 1) th frame under the capacitive coupling action of the second capacitor. The pixel signal extraction method has the advantages that the first end of the second capacitor stores the (N + 1) th frame pixel signal, the second end of the second capacitor and the first end of the first capacitor store the (N + 2) th frame pixel signal, and the second end of the second capacitor is converted into the difference value between the (N + 2) th frame pixel signal and the (N + 1) th frame pixel signal by controlling the switching states of the first switch, the second switch, the third switch, the fourth switch, the fifth switch and the sixth switch, so that the second extraction unit obtains the second signal difference.
Optionally, the difference exponent amplifying module includes a triode, an amplifier, and a resistor, a collector of the triode is connected to the second end of the first capacitor and the second end of the second capacitor, a base of the triode is shorted with the collector, and an emitter of the triode is connected to the inverting input terminal of the amplifier;
the output end of the amplifier is connected with the first input end of the difference comparison module, the non-inverting input end of the amplifier is used for receiving a second common-mode signal, and the second common-mode signal is used for participating in exponential amplification operation of the signal difference to obtain a pixel difference signal;
and two ends of the resistor are respectively connected with a node between the emitter of the triode and the inverting input end of the amplifier and a node between the output end of the amplifier and the first input end of the difference comparator.
Optionally, when the comparison result is that the pixel difference signal is equal to the first common-mode signal, determining that a target pixel corresponding to the pixel difference signal is in a static state;
and when the comparison result shows that the pixel difference signal is not equal to the first common-mode signal, determining that the target pixel corresponding to the pixel difference signal is in a motion state. The method has the advantages that the comparison result is obtained through the difference comparison module, whether the target pixel is in the motion state or not is judged according to the comparison result, the judgment method is simple, the steps are few, the circuit complexity is low, and the motion detection speed is improved.
Drawings
Fig. 1 is a block diagram of the motion detection circuit according to the embodiment of the present invention;
FIG. 2 is a flow chart of the motion detection steps of the motion detection circuit according to the embodiment of the present invention;
FIG. 3 is a flowchart illustrating the steps of the first extraction unit and the second extraction unit operating alternately according to an embodiment of the present invention;
FIG. 4 is a schematic circuit diagram of a motion detection circuit according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a first circuit connection of the difference extraction module of FIG. 4;
FIG. 6 is a schematic diagram of a second circuit connection of the difference extraction module of FIG. 4;
FIG. 7 is a third circuit connection diagram of the difference extraction module of FIG. 4;
FIG. 8 is a fourth circuit connection schematic of the difference extraction module of FIG. 4;
FIG. 9 is a fifth circuit connection diagram of the difference extraction module of FIG. 4.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. As used herein, the word "comprising" and similar words are intended to mean that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items.
To solve the problems in the prior art, an embodiment of the present invention provides a motion detection circuit, and fig. 1 is a block diagram of the motion detection circuit according to the embodiment of the present invention.
Referring to fig. 1, the motion detection circuit of the present invention includes a pixel output module 1, a difference processing module and a difference comparison module 4, where the difference processing module includes a difference extraction module 2 and a difference index amplification module 3, an input end of the difference extraction module 2 is connected to an output end of the pixel output module 1, an output end of the difference extraction module 2 is connected to an input end of the difference index amplification module 3, an output end of the difference index amplification module 3 is connected to a first input end of the difference comparison module 4, and a second input end of the difference comparison module 4 is configured to receive a first common-mode signal;
the pixel output module 1 is configured to sequentially transmit a plurality of consecutive adjacent frame pixel signals to the difference extraction module 2;
the difference extraction module 2 is configured to extract a difference between the pixel signals of the adjacent frames to obtain a signal difference of a pixel;
the difference exponential amplification module 3 is configured to perform an exponential amplification operation on the signal difference to obtain a pixel difference signal;
the difference comparing module 4 is configured to compare the pixel difference signal with the first common mode signal to output a comparison result, and determine whether a target pixel corresponding to the pixel difference signal is in a motion state according to the comparison result.
The motion detection circuit has the advantages that: the difference index amplification module 3 is used for carrying out index amplification operation on the signal difference to obtain a pixel difference signal, namely a difference signal, through index amplification, a slight difference signal can be amplified to be convenient for capturing a fine moving object change signal, the signal difference between two adjacent frames of image pixels can be more accurately acquired, and the precision of motion detection is improved; meanwhile, through the differential amplification of the two adjacent frame signals by exponential amplification, even if the signal of the previous frame is smaller than the signal of the next frame, the signal of the previous frame cannot be cut off, the differential signal of any two frame signals can be obtained, and the precision of motion detection is further improved; because each pixel does not need to be subjected to analog-to-digital conversion, the analog-to-digital conversion time is saved, the motion detection efficiency is improved, the detection cost is saved, and the problems that the motion detection time of the image sensor in the prior art is long and the cost is increased are solved.
In some embodiments, the pixel output module 1 may implement the functions of extracting pixels in multiple frames of images and sequentially transmitting a plurality of consecutive pixel signals of adjacent frames to the difference extraction module 2 through a conventional circuit module in the art, which is not described herein again.
In some embodiments, the pixel output module 1 extracts the features of the pixels, acquires a target pixel to be detected in a multi-frame image and having the same features of the pixels according to the features of the pixels, then acquires a signal difference and a pixel difference signal of the target pixel in different frame images, compares the pixel difference signal with the first common mode signal to output a comparison result, and determines whether the target pixel corresponding to the pixel difference signal is in a motion state according to the comparison result to detect the motion state of the target pixel in different frame images.
In some embodiments, by detecting the pixel difference signal between moving objects in multiple frames of images, the motion contour and the motion direction of the objects can be reflected, so that the method can be further applied to motion trajectory prediction and intelligent application scenes of the moving objects.
As an alternative embodiment of the present invention, referring to fig. 1, the difference extraction module 2 includes a first extraction unit 21 and a second extraction unit 22, an input end of the first extraction unit 21 and an input end of the second extraction unit 22 are both connected to an output end of the pixel output module 1, and an output end of the first extraction unit 21 and an output end of the second extraction unit 22 are both connected to an input end of the difference index amplification module 3;
the first extraction unit 21 collects continuous pixel signals of an Nth frame to an (N + M) th frame, wherein N and M are positive integers, and the second extraction unit 22 collects continuous pixel signals of an (N + 1) th frame to an (N + M) th frame; wherein N is more than or equal to 1, and M is more than or equal to 2;
the first extraction unit 21 and the second extraction unit 22 alternately obtain differences between pixel signals of adjacent frames according to the consecutive pixel signals from the nth frame to the N + mth frame to obtain first signal differences to mth signal differences, and respectively output the first signal differences to the mth signal differences to the difference exponential amplification module 3. The image sensor has the advantages that the first extraction unit 21 and the second extraction unit 22 are used for respectively acquiring the continuous pixel signals from the Nth frame to the (N + M) th frame and alternately acquiring the difference of the pixel signals of the adjacent frames to obtain the difference from the first signal difference to the M-th signal difference, the detection order is embodied, the difference signal comparison of all the continuous frames is realized by the alternate difference acquisition mode of the first extraction unit 21 and the second extraction unit 22, and the continuous motion detection of the whole image sensor is realized.
Fig. 2 is a flow chart of the motion detection steps of the motion detection circuit according to the embodiment of the invention.
In some embodiments, referring to fig. 2, the motion detection step of the motion detection circuit of the present invention comprises:
s1: acquiring an Nth frame of pixel signals and an (N + 1) th frame of pixel signals through a difference extraction module, wherein N is a positive integer, and extracting the difference between the Nth frame of pixel signals and the (N + 1) th frame of pixel signals to obtain an Nth frame of signal difference;
s2: performing exponential amplification operation on the signal difference of the Nth frame through a difference exponential amplification module to obtain a pixel difference signal;
s3: and comparing the pixel difference signal with the first common-mode signal through the difference comparison module to output a comparison result, and judging whether a target pixel corresponding to the pixel difference signal is in a motion state or not according to the comparison result.
In some embodiments, in the step S1, the step of acquiring the nth frame pixel signal and the (N + 1) th frame pixel signal may be performed simultaneously to increase the motion detection speed.
In some embodiments, in the above steps S1 to S3, after the pixel signal of the nth frame and the pixel signal of the (N + 1) th frame are collected, the signal difference of the nth frame is obtained, the adjacent signal difference of the nth frame is exponentially amplified to obtain a pixel difference signal, the pixel difference signal is compared with the first common mode signal to output a comparison result, and after whether the target pixel corresponding to the pixel difference signal is in a motion state is determined according to the comparison result, the pixel signal of the (N + 2) th frame is collected;
in an actual working process, the process of comparing the pixel difference signal with the first common-mode signal may be performed simultaneously with the process of acquiring the pixel signal of the (N + 2) th frame, that is, the process of comparing the pixel difference signal and the process of acquiring the pixel of the next frame to be detected may be performed simultaneously, so as to further improve the motion detection speed.
Fig. 3 is a flowchart illustrating steps of the first extraction unit and the second extraction unit working alternately according to an embodiment of the present invention, and in some embodiments, referring to fig. 3, taking an example of acquiring adjacent four frames of pixel signals to implement two times of motion detection, the steps of the first extraction unit and the second extraction unit working include:
s201: collecting an Nth frame of pixel signals through the first extraction unit; wherein N is a positive integer and is more than or equal to 1;
s202: acquiring an N +1 th frame of pixel signals through the first extraction unit and the second extraction unit;
s203: extracting the difference between the pixel signal of the Nth frame and the pixel signal of the (N + 1) th frame through a first extraction unit to obtain the pixel difference of a first adjacent frame;
performing exponential amplification on the pixel difference of the first adjacent frame to obtain a first pixel difference signal, comparing the first pixel difference signal with a first common-mode signal to output a comparison result, and obtaining a motion state according to the comparison result to realize motion detection on pixels corresponding to the first pixel difference signal, wherein the step is performed by a non-first extraction unit and a non-second extraction unit;
s204: acquiring an N +2 th frame pixel signal through the first extraction unit and the second extraction unit;
s205: extracting the difference between the pixel signal of the (N + 2) th frame and the pixel signal of the (N + 1) th frame through a second extraction unit to obtain the pixel difference of a second adjacent frame;
performing exponential amplification on the pixel difference of the second adjacent frame to obtain a second pixel difference signal, comparing the second pixel difference signal with the first common-mode signal to output a comparison result, and obtaining a motion state according to the comparison result to realize motion detection on pixels corresponding to the second pixel difference signal, wherein the step is performed by a non-first extraction unit and a non-second extraction unit;
s206: acquiring pixel signals of the (N + 3) th frame through the first extraction unit and the second extraction unit;
the first extraction unit and the second extraction unit work according to the steps of alternately collecting the pixel signals and acquiring the pixel difference signals, so that the pixel difference signals of all continuous frames are compared, and the continuous motion detection of the target pixel of the whole image sensor is realized.
In the above step S206, the pixel signals of the (N + 3) th frame are collected to illustrate that the whole motion detection process can continue to operate alternately according to the previous motion detection step, and the specific details, that is, the following steps, are not described.
In the application, when N is 1, only the first extraction unit collects the 1 st frame pixel signal; signals subsequent to the 1 st frame of pixel signals are collected by the first extraction unit and the second extraction unit together; except the 1 st frame pixel signal, the first extraction unit and the second extraction unit collect the pixel signal together;
when N >1, if the motion detection is performed on the pixel corresponding to the first pixel difference signal from the nth frame pixel signal and the N +1 th frame pixel signal, the pixel signal before the nth frame is not subjected to the motion detection, but the pixel signal before the nth frame is still acquired by the first extraction unit and the second extraction unit, but the processing or non-processing of the pixel signal before the nth frame is out of the consideration of the present invention.
In some embodiments, in an actual operation process, in addition to the step of acquiring the pixel signal of the nth frame by the first extraction unit, when the first extraction unit operates, the second extraction units may simultaneously operate in parallel to improve the motion detection speed. Fig. 3 is a schematic diagram, and for clarity of description of the alternate operation, the second extraction unit is not shown in operation while the first extraction unit is in operation.
In some embodiments, the step of acquiring the nth frame pixel signal and the step of acquiring the (N + 1) th frame pixel signal of the step S201 and the step S202 may be performed simultaneously to increase the motion detection speed;
the step of extracting the difference between the nth frame and the (N + 1) th frame in step S203 and the step of acquiring the pixel signal of the (N + 2) th frame in step S204 may also be performed at the same time to further increase the motion detection speed.
Fig. 4 is a schematic circuit structure diagram of a motion detection circuit according to an embodiment of the invention.
As an alternative embodiment of the present invention, referring to fig. 4, the first extraction unit 21 includes a first capacitor 210 and a first switch control unit, and the first capacitor 210 is connected to the first switch control unit;
the first switch control unit is configured to control the first capacitor 210 to approach a second end of the difference exponential amplification module 3 to output a difference value between the N +1 th frame pixel signal and the N frame pixel signal, so as to obtain the first signal difference. The first circuit extraction unit has the advantages that the second end of the first capacitor 210 is controlled by the first switch control unit to output the difference value between the (N + 1) th frame pixel signal and the N frame pixel signal so as to obtain the first signal difference, and the first circuit extraction unit is simple in circuit structure, easy to realize and small in area requirement on the image sensor.
As an alternative embodiment of the present invention, referring to fig. 4, the first switch control unit includes a first switch 211, a second switch 212, and a third switch 213;
the second switch 212 is connected to the output end of the pixel output module 1 near the first end of the pixel output module 1, and the second end of the second switch 212 is connected to the first end of the first capacitor 210;
the second end of the first capacitor 210 is connected to the input end of the difference exponential amplification module 3;
two ends of the first switch 211 are respectively grounded and connected to a node between the second end of the second switch 212 and the first end of the first capacitor 210;
two ends of the third switch 213 are respectively connected to the first end of the second switch 212 and the second end of the first capacitor 210.
As an alternative embodiment of the present invention, referring to fig. 4, the second extraction unit 22 includes a second capacitor 220 and a second switch control unit, and the second switch control unit is connected to the second capacitor 220;
the second switch control unit is configured to control the second capacitor 220 to output a difference value between the N +2 th frame pixel signal and the N +1 th frame pixel signal near the second end of the difference exponential amplification module 3, so as to obtain a second signal difference. The advantage is that the second switch control unit controls the second end of the second capacitor 220 to output the difference value between the N +1 th frame pixel signal and the N frame pixel signal, so as to obtain the second signal difference, and the second extraction unit 22 has a simple circuit structure, is easy to implement, and has a small area requirement on the image sensor.
As an alternative embodiment of the present invention, referring to fig. 4, the second switch control unit includes a fourth switch 221, a fifth switch 222, and a sixth switch 223;
the fifth switch 222 is connected to the output end of the pixel output module 1 near the first end of the pixel output module 1, and the second end of the fifth switch 222 is connected to the first end of the first capacitor 210;
the second end of the second capacitor 220 is connected to the input end of the difference exponential amplification module 3;
two ends of the sixth switch 223 are respectively connected to the first end of the fifth switch 222 and the second end of the second capacitor 220;
two ends of the fourth switch 221 are respectively connected to ground and a node between the second end of the fifth switch 222 and the first end of the second capacitor 220.
As an optional embodiment of the present invention, when the pixel output module 1 outputs the pixel signal of the nth frame, the second switch 212 is closed, the first switch 211, the third switch 213, the fourth switch 221, the fifth switch 222, and the sixth switch 223 are all opened, and the first end of the first capacitor 210 stores the pixel signal of the nth frame;
when the pixel output module 1 outputs the N +1 th frame pixel signal, the third switch 213 and the fifth switch 222 are closed, the first switch 211, the second switch 212, the fourth switch 221 and the sixth switch 223 are opened, and the second end of the first capacitor 210 and the first end of the second capacitor 220 both store the N +1 th frame pixel signal;
the first switch 211 is closed, the second switch 212 and the third switch 213 are opened, and the second end signal of the first capacitor 210 is converted into the difference value between the N +1 th frame pixel signal and the N frame pixel signal under the coupling effect of the first capacitor 210. The first extraction unit 21 obtains the first signal difference by controlling the switch states of the first switch 211, the second switch 212, the third switch 213, the fourth switch 221, the fifth switch 222, and the sixth switch 223, so that the first end of the first capacitor 210 stores the nth frame pixel signal, the second end of the first capacitor 210 and the first end of the second capacitor 220 both store the (N + 1) th frame pixel signal, and the second end signal of the first capacitor 210 is converted into the difference between the (N + 1) th frame pixel signal and the N frame pixel signal.
In some embodiments, the difference extraction module 2 supports two extraction units to arbitrarily collect pixel signals, the first extraction unit 21 and the second extraction unit 22 sequentially extract pixel signals, for example, the first extraction unit 21 extracts an nth frame pixel signal and an N +1 th frame pixel signal, the second extraction unit 22 extracts an N +1 frame pixel signal and an N +2 frame pixel signal, then the first extraction unit 21 extracts an N +2 frame pixel signal and an N +3 frame pixel signal, the second extraction unit 22 extracts an N +3 frame pixel signal to an N +4 frame pixel signal, and sequentially collects pixel signals according to the above rules.
In other embodiments, when only the first extraction unit 21 extracts the pixel signal, after the first extraction unit 21 extracts the pixel signal of the nth frame and the pixel signal of the N +1 frame, the fourth switch 221 is opened, and the fifth switch 222 and the sixth switch 223 are closed again to store the pixel signal of the N +1 th frame across the second capacitor 220 again. This manner of acquiring the pixel signals corresponds to transmitting the N +1 th frame of pixel signals to the difference extraction module 2 times, and the frame rate of this manner of acquiring the pixel signals is reduced relative to the frame rate of sequentially extracting the pixel signals by the first extraction unit 21 and the second extraction unit 22.
As an optional embodiment of the present invention, when the pixel output module 1 outputs a pixel signal of an N +2 th frame, the second switch 212 and the sixth switch 223 are closed, the first switch 211, the third switch 213, the fourth switch 221 and the fifth switch 222 are all opened, the first end of the second capacitor 220 stores the pixel signal of the N +1 th frame, and the second end of the second capacitor 220 and the first end of the first capacitor 210 store the pixel signal of the N +2 th frame;
the fourth switch 221 is turned on, the fifth switch 222 and the sixth switch 223 are turned off, and the second end signal of the second capacitor 220 is converted into the difference value between the N +2 frame pixel signal and the N +1 frame pixel signal under the capacitive coupling effect of the second capacitor 220. The advantage is that by controlling the switch states of the first switch 211, the second switch 212, the third switch 213, the fourth switch 221, the fifth switch 222 and the sixth switch 223, the first end of the second capacitor 220 stores the (N + 1) th frame pixel signal, the second end of the second capacitor 220 and the first end of the first capacitor 210 store the (N + 2) th frame pixel signal, and the second end signal of the second capacitor 220 is converted into the difference value between the (N + 2) th frame pixel signal and the (N + 1) th frame pixel signal, so that the second extracting unit 22 obtains the second signal difference.
As an alternative embodiment of the present invention, referring to fig. 4, the difference exponent amplifying module 3 includes a transistor 31, an amplifier 32, and a resistor 33, wherein a collector of the transistor 31 is connected to the second terminal of the first capacitor 210 and the second terminal of the second capacitor 220, a base of the transistor 31 is shorted with the collector, and an emitter of the transistor 31 is connected to the inverting input terminal of the amplifier 32;
the output end of the amplifier 32 is connected to the first input end of the difference comparing module 4, the non-inverting input end of the amplifier 32 is configured to receive a second common mode signal, and the second common mode signal is configured to participate in an exponential amplification operation of the signal difference to obtain a pixel difference signal;
two ends of the resistor 33 are respectively connected to a node between the emitter of the triode 31 and the inverting input terminal of the amplifier 32, and a node between the output terminal of the amplifier 32 and the first input terminal of the difference comparator.
As an optional implementation manner of the present invention, when the comparison result is that the pixel difference signal is equal to the first common-mode signal, it is determined that a target pixel corresponding to the pixel difference signal is in a static state;
and when the comparison result shows that the pixel difference signal is not equal to the first common-mode signal, determining that the target pixel corresponding to the pixel difference signal is in a motion state. The method has the advantages that the comparison result is obtained through the difference comparison module 4, whether the target pixel is in the motion state or not is judged according to the comparison result, the judgment method is simple, the steps are few, the circuit complexity is low, and the motion detection speed is improved.
In some embodiments, the difference comparison module 4 may be implemented by a comparison circuit or a comparator of the prior art; the comparison method of the difference comparison module 4 is not limited to the comparison between the pixel difference signal and the first common-mode signal, and all methods that achieve the comparison between the pixel difference signal and the reference signal to obtain the comparison result are within the protection scope of the present invention according to whether the huge target pixel is in the motion state or not.
FIG. 5 is a schematic diagram of a first circuit connection of the difference extraction module of FIG. 4; FIG. 6 is a schematic diagram of a second circuit connection of the difference extraction module of FIG. 4; FIG. 7 is a third circuit connection diagram of the difference extraction module of FIG. 4; FIG. 8 is a fourth circuit connection schematic of the difference extraction module of FIG. 4; FIG. 9 is a fifth circuit connection diagram of the difference extraction module of FIG. 4.
In some embodiments, the specific motion detection steps of the motion detection circuit of the present invention, described with reference to fig. 2-7, include the following four steps:
step (1): acquiring a first signal difference, which comprises the following specific steps:
when the pixel output module 1 outputs the N-th frame pixel signal VPNWhen N is a positive integer, referring to fig. 5, the second switch 212 is turned on, the first switch 211, the third switch 213, the fourth switch 221, the fifth switch 222, and the sixth switch 223 are all turned off, the first extraction unit 21 operates, and the first end of the first capacitor 210 stores the nth frame pixel signal VPNI.e. the first terminal signal V1 ═ VP of the first capacitor 210N；
When the pixel output module 1 outputs the (N + 1) th frame pixel signal VPN+1Referring to fig. 6, the third switch 213 and the fifth switch 222 are closed, the first switch 211, the second switch 212, the fourth switch 221, and the sixth switch 223 are opened, the first extraction unit 21 and the second extraction unit 22 are both operated, and the first end signal of the first capacitor 210 is maintained as V1 VPNThe second end of the first capacitor 210 and the first end of the second capacitor 220 both store the N +1 th frame pixel signal VPN+1That is, the second end signal V2 of the first capacitor 210 and the first end signal V3 of the second capacitor 220 are both VPN+1I.e. V2 ═ V3 ═ VPN+1At this time, the two ends of the first capacitor 210 respectively store the nth frame pixel signal VPNAnd the N +1 th frame pixel signal VPN+1；
Referring to fig. 7, the first switch 211 is closed, the second switch 212 and the third switch 213 are opened, the first extraction unit 21 is operated, the second extraction unit 22 maintains the previous state, the first end signal V1 of the first capacitor 210 is grounded, the second end signal V2 of the first capacitor 210 is in a floating state, the second end signal V2 of the first capacitor 210 is also dropped simultaneously under the coupling effect of the first capacitor 210, the voltage amplitude of the dropped V2 is the same as that of V1, that is, V2 is dropped to V21, and the calculation formula of V21 is:
V21＝VPN+1-VPN
wherein V21 is the first signal difference;
the difference extraction of the nth frame pixel signal and the N +1 th frame pixel signal is realized, and the first signal difference V21 is obtained.
Step (2): acquiring a second signal difference, which comprises the following specific steps:
when the pixel output module 1 outputs the pixel signal VP of the (N + 2) th frameN+2In time, referring to fig. 8, the second switch 212 and the sixth switch 223 are closed, the first switch 211, the third switch 213, the fourth switch 221 and the fifth switch 222 are all opened, and the first extraction unit 21 and the second extraction unit 22 are all operated; the first end of the second capacitor 220 stores the (N + 1) th frame pixel signal VPN+1The second end of the second capacitor 220 and the first end of the first capacitor 210 store the N +2 th frame pixel signal VPN+2I.e. V3 ═ VPN+1The second end signal of the second capacitor 220 is V4, V1 ═ V4 ═ VPN+2(ii) a At this time, the two ends of the second capacitor 220 respectively store the (N + 1) th frame pixel signal VPN+1And the N +2 th frame pixel signal VPN+2；
Referring to fig. 9, the fourth switch 221 is turned on, the fifth switch 222 and the sixth switch 223 are turned off, the second extraction unit 22 is operated, the first extraction unit 21 maintains the previous state, and the first end signal V3 of the second capacitor 220 is grounded, and the second end signal V3 of the second capacitor 220 is floating, so that the second end signal of the second capacitor 220 is converted into the (N + 2) th frame under the capacitive coupling effect of the second capacitor 220Pixel signal VPN+2And the N +1 th frame pixel signal VPN+1The voltage amplitude of the drop of V4 is the same as that of V3, i.e. V4 drops to V43, and the calculation formula of V43 is:
V43＝VPN+2-VPN+1，
wherein V43 is the second signal difference;
completing the N +2 frame pixel signal VPN+2And the N +1 th frame pixel signal VPN+1The second signal difference V43 is obtained.
And (3): the calculation formula for calculating the pixel difference signal output by the output end of the difference index amplification module comprises the following specific steps:
the extracted difference signal is input to the difference exponent amplifying module 3, i.e. the first signal difference V21 and the second signal difference V43 are input to the difference exponent amplifying module 3. Since the two input terminals of the amplifier 32 are "virtual off", the current flowing into the two input terminals of the amplifier 32 is approximately 0, and therefore the current Id flowing through the transistor 31 is equal to the current Ir flowing through the resistor 33; since the two input terminals of the amplifier 32 are "virtual short" and the non-inverting input terminal and the inverting input terminal of the amplifier 32 are regarded as equipotential, the current Ir flowing through the resistor 33 satisfies the calculation formula (1):
Ir×R1＝Vx-V5
wherein Vx is the second common mode signal that the positive phase input end of the amplifier inputs, R1 is the resistance value of the resistance, V5 is the pixel difference signal that the difference exponent amplification module 3 output;
it can be said that "virtual disconnection" means that when the amplifier operates in a linear state, the currents at the two input terminals are both approximately 0, that is, the connection between the inverting input terminal and the non-inverting input terminal of the amplifier is equivalent to disconnection, which is called as false disconnection, and is referred to as "virtual disconnection" for short;
the "virtual short" means that when the amplifier operates in a linear state, the positive input terminal and the negative input terminal can be considered to be applied with the same voltage, so that the two input terminals can be considered as equipotential, that is, a short circuit is formed between the negative input terminal and the positive input terminal of the amplifier, which is called a virtual short for short, but the two input terminals of the amplifier are not in a short circuit state;
therefore, the current flowing through the transistor 31 satisfies the calculation formula (2):
the Id is a current flowing through the triode, specifically a current flowing from a collector to a base of the triode; is the reverse saturation current of the PN junction of the triode, and Ut Is the equivalent of temperature and voltage;
according to the above formula (1) and formula (2), the calculation formula (3) for obtaining the pixel difference signal V5 output by the difference exponent amplifying module 3 is:
after the difference extraction module 2 finishes collecting the pixel signals of two frames and extracts the pixel signal difference, V21 is obtained as VPN+1-VPNIn this case, the calculation formula (4) of V5 is:
according to the above formula, the pixel difference signal V5 output by the difference exponent amplifying module 3 is in a one-to-one correspondence with the first signal difference V21.
And (4): setting a second common mode signal, and judging whether the pixel is in a motion state, wherein the specific steps are as follows:
the voltage of the second common-mode signal input to the second input terminal of the difference comparator is Vy, and a calculation formula (5) of the preset Vy is as follows:
wherein Vy is a first common-mode signal;
v5 and Vy are compared by equation (4) and equation (5) to determine whether the pixel is in motion:
when V5 is Vy, V is describedPN+1＝VPNIf the two frames of images of N and N +1 have no difference, determining that the target pixel corresponding to the pixel difference signal is in a static state, namely determining that the object corresponding to the target pixel is in a static and motionless state;
when V5 ≠ Vy, it is demonstrated that V5 ≠ Vy, and the difference exists between the two frame images N and N +1, and it is determined that the target pixel corresponding to the pixel difference signal is in a motion state, that is, it is determined that the object corresponding to the target pixel is in a motion state.
The above-mentioned motion detection step is an embodiment of the motion detection structure of the present invention, and the embodiment of the present invention is only to illustrate the whole motion detection working mode, and the signal acquisition process, the difference signal acquisition process and the difference comparison process do not work simultaneously, but a motion detection mode in which any two processes work simultaneously and concurrently is also within the scope of protection of the present invention. Meanwhile, the invention only provides a circuit schematic diagram of the difference extraction module comprising two extraction units, and the structure of the difference extraction module comprising two or more extraction units is also within the protection scope of the invention.
Although the embodiments of the present invention have been described in detail hereinabove, it is apparent to those skilled in the art that various modifications and variations can be made to these embodiments. However, it is to be understood that such modifications and variations are within the scope and spirit of the present invention as set forth in the following claims. Moreover, the invention as described herein is capable of other embodiments and of being practiced or of being carried out in various ways.
Claims (10)
1. A motion detection circuit is characterized by comprising a pixel output module, a difference processing module and a difference comparison module, wherein the difference extraction module comprises a difference extraction module and a difference index amplification module, the input end of the difference extraction module is connected with the output end of the pixel output module, the output end of the difference extraction module is connected with the input end of the difference index amplification module, the output end of the difference index amplification module is connected with the first input end of the difference comparison module, and the second input end of the difference comparison module is used for receiving a first common-mode signal;
the pixel output module is used for sequentially transmitting a plurality of continuous adjacent frame pixel signals to the difference extraction module;
the difference extraction module is used for extracting the difference of the pixel signals of the adjacent frames to obtain the signal difference of the pixels;
the difference exponential amplification module is used for carrying out exponential amplification operation on the signal difference to obtain a pixel difference signal;
the difference comparison module is used for comparing the pixel difference signal with the first common-mode signal to output a comparison result, and judging whether a target pixel corresponding to the pixel difference signal is in a motion state or not according to the comparison result.
2. The motion detection circuit of claim 1, wherein the difference extraction module comprises a first extraction unit and a second extraction unit, an input terminal of the first extraction unit and an input terminal of the second extraction unit are both connected to an output terminal of the pixel output module, and an output terminal of the first extraction unit and an output terminal of the second extraction unit are both connected to an input terminal of the difference exponent amplification module;
the first extraction unit collects continuous pixel signals from the Nth frame to the (N + M) th frame, wherein both N and M are positive integers, and the second extraction unit collects continuous pixel signals from the (N + 1) th frame to the (N + M) th frame;
the first extraction unit and the second extraction unit alternately acquire the difference of pixel signals of adjacent frames according to the continuous pixel signals from the Nth frame to the (N + M) th frame to obtain a first signal difference to an Mth signal difference, and respectively output the first signal difference to the Mth signal difference to the difference index amplification module.
3. The motion detection circuit according to claim 2, wherein the first extraction unit includes a first capacitor and a first switch control unit, the first capacitor being connected to the first switch control unit;
the first switch control unit is used for controlling the first capacitor to be close to a second end of the difference exponential amplification module to output a difference value between the (N + 1) th frame pixel signal and the N frames pixel signal so as to obtain the first signal difference.
4. The motion detection circuit according to claim 3, wherein the first switch control unit includes a first switch, a second switch, and a third switch;
the first end of the second switch close to the pixel output module is connected with the output end of the pixel output module, and the second end of the second switch is connected with the first end of the first capacitor;
the second end of the first capacitor is connected with the input end of the difference exponential amplification module;
two ends of the first switch are respectively grounded and connected with a node between the second end of the second switch and the first end of the first capacitor;
and two ends of the third switch are respectively connected with the first end of the second switch and the second end of the first capacitor.
5. The motion detection circuit according to claim 4, wherein the second extraction unit includes a second capacitor and a second switch control unit, the second switch control unit being connected to the second capacitor;
the second switch control unit is used for controlling the second capacitor to be close to a second end of the difference exponential amplification module to output a difference value between the (N + 2) th frame pixel signal and the (N + 1) th frame pixel signal so as to obtain a second signal difference.
6. The motion detection circuit according to claim 5, wherein the second switch control unit includes a fourth switch, a fifth switch, and a sixth switch;
the first end of the fifth switch close to the pixel output module is connected with the output end of the pixel output module, and the second end of the fifth switch is connected with the first end of the first capacitor;
the second end of the second capacitor is connected with the input end of the difference exponential amplification module;
two ends of the sixth switch are respectively connected with the first end of the fifth switch and the second end of the second capacitor;
and two ends of the fourth switch are respectively grounded and connected with a node between the second end of the fifth switch and the first end of the second capacitor.
7. The motion detection circuit according to claim 6, wherein when the pixel output module outputs an nth frame pixel signal, the second switch is closed, the first switch, the third switch, the fourth switch, the fifth switch, and the sixth switch are all open, and the first end of the first capacitor stores the nth frame pixel signal;
when the pixel output module outputs a pixel signal of an (N + 1) th frame, the third switch and the fifth switch are closed, the first switch, the second switch, the fourth switch and the sixth switch are opened, and the second end of the first capacitor and the first end of the second capacitor both store the pixel signal of the (N + 1) th frame;
and closing the first switch, and opening the second switch and the third switch, so that the second end signal of the first capacitor is converted into the difference value between the N +1 th frame pixel signal and the N frame pixel signal under the coupling action of the first capacitor.
8. The motion detection circuit according to claim 6, wherein when the pixel output module outputs a pixel signal of an N +2 th frame, the second switch and the sixth switch are closed, the first switch, the third switch, the fourth switch, and the fifth switch are all open, a first terminal of the second capacitor stores a pixel signal of an N +1 th frame, a second terminal of the second capacitor and a first terminal of the first capacitor store a pixel signal of an N +2 th frame;
and closing the fourth switch, and turning off the fifth switch and the sixth switch, so that a second end signal of the second capacitor is converted into a difference value between the pixel signal of the (N + 2) th frame and the pixel signal of the (N + 1) th frame under the capacitive coupling action of the second capacitor.
9. The motion detection circuit of claim 6, wherein the difference exponent amplifying module comprises a transistor, an amplifier and a resistor, wherein a collector of the transistor is connected to the second terminal of the first capacitor and the second terminal of the second capacitor, a base of the transistor is shorted to the collector, and an emitter of the transistor is connected to the inverting input of the amplifier;
the output end of the amplifier is connected with the first input end of the difference comparison module, the non-inverting input end of the amplifier is used for receiving a second common-mode signal, and the second common-mode signal is used for participating in exponential amplification operation of the signal difference to obtain a pixel difference signal;
and two ends of the resistor are respectively connected with a node between the emitter of the triode and the inverting input end of the amplifier and a node between the output end of the amplifier and the first input end of the difference comparator.
10. The motion detection circuit of claim 1, wherein when the comparison result is that the pixel difference signal is equal to the first common-mode signal, it is determined that a target pixel corresponding to the pixel difference signal is in a static state;
and when the comparison result shows that the pixel difference signal is not equal to the first common-mode signal, determining that the target pixel corresponding to the pixel difference signal is in a motion state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111678542.0A CN114302081B (en) | 2021-12-31 | 2021-12-31 | Motion detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111678542.0A CN114302081B (en) | 2021-12-31 | 2021-12-31 | Motion detection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114302081A true CN114302081A (en) | 2022-04-08 |
| CN114302081B CN114302081B (en) | 2023-07-28 |
Family
ID=80975994
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111678542.0A Active CN114302081B (en) | 2021-12-31 | 2021-12-31 | Motion detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114302081B (en) |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8625892D0 (en) * | 1985-11-01 | 1986-12-03 | Rca Corp | Image motion detector |
| JPH06165129A (en) * | 1992-11-18 | 1994-06-10 | Matsushita Electric Ind Co Ltd | Motion detecting circuit |
| US6590611B1 (en) * | 1997-11-28 | 2003-07-08 | Nikon Corporation | Solid-state image-pickup devices and methods for motion detection |
| US20030189548A1 (en) * | 2002-04-09 | 2003-10-09 | Fabrizio Rovati | Process and device for global motion estimation in a sequence of images and a computer program product therefor |
| JP2013074384A (en) * | 2011-09-27 | 2013-04-22 | Jvc Kenwood Corp | Image processing apparatus and image processing method |
| US20140204250A1 (en) * | 2013-01-24 | 2014-07-24 | Moo Young Kim | Image sensor, operating method thereof, and system including same |
| CN108600579A (en) * | 2018-05-16 | 2018-09-28 | 上海集成电路研发中心有限公司 | A kind of motion detection circuit and method for testing motion applied to CIS |
| CN108712621A (en) * | 2018-06-29 | 2018-10-26 | 华中科技大学 | A kind of moving object detection circuit based on memristor and CMOS |
| JP2019193150A (en) * | 2018-04-26 | 2019-10-31 | キヤノン株式会社 | Imaging element and method for controlling the same, and imaging device |
| GB2577353A (en) * | 2018-09-19 | 2020-03-25 | Univ Guangdong Technology | A pixel unit, image sensor and camera |
| US20200389616A1 (en) * | 2019-06-07 | 2020-12-10 | Pacific Biosciences Of California, Inc. | Temporal differential active pixel sensor |
| CN112788262A (en) * | 2020-12-30 | 2021-05-11 | 上海集成电路研发中心有限公司 | Image signal detection circuit, control method, and motion detection method |
-
2021
- 2021-12-31 CN CN202111678542.0A patent/CN114302081B/en active Active
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8625892D0 (en) * | 1985-11-01 | 1986-12-03 | Rca Corp | Image motion detector |
| US4661853A (en) * | 1985-11-01 | 1987-04-28 | Rca Corporation | Interfield image motion detector for video signals |
| JPS62109490A (en) * | 1985-11-01 | 1987-05-20 | アールシーエー トムソン ライセンシング コーポレーシヨン | Movement detecting circuit |
| JPH06165129A (en) * | 1992-11-18 | 1994-06-10 | Matsushita Electric Ind Co Ltd | Motion detecting circuit |
| US6590611B1 (en) * | 1997-11-28 | 2003-07-08 | Nikon Corporation | Solid-state image-pickup devices and methods for motion detection |
| US20030189548A1 (en) * | 2002-04-09 | 2003-10-09 | Fabrizio Rovati | Process and device for global motion estimation in a sequence of images and a computer program product therefor |
| JP2013074384A (en) * | 2011-09-27 | 2013-04-22 | Jvc Kenwood Corp | Image processing apparatus and image processing method |
| US20140204250A1 (en) * | 2013-01-24 | 2014-07-24 | Moo Young Kim | Image sensor, operating method thereof, and system including same |
| JP2019193150A (en) * | 2018-04-26 | 2019-10-31 | キヤノン株式会社 | Imaging element and method for controlling the same, and imaging device |
| CN108600579A (en) * | 2018-05-16 | 2018-09-28 | 上海集成电路研发中心有限公司 | A kind of motion detection circuit and method for testing motion applied to CIS |
| CN108712621A (en) * | 2018-06-29 | 2018-10-26 | 华中科技大学 | A kind of moving object detection circuit based on memristor and CMOS |
| GB2577353A (en) * | 2018-09-19 | 2020-03-25 | Univ Guangdong Technology | A pixel unit, image sensor and camera |
| US20200389616A1 (en) * | 2019-06-07 | 2020-12-10 | Pacific Biosciences Of California, Inc. | Temporal differential active pixel sensor |
| CN112788262A (en) * | 2020-12-30 | 2021-05-11 | 上海集成电路研发中心有限公司 | Image signal detection circuit, control method, and motion detection method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114302081B (en) | 2023-07-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Kramer | Compact integrated motion sensor with three-pixel interaction | |
| Ji et al. | A CMOS contact imager for locating individual cells | |
| US12001945B2 (en) | Event driven mathematical engine and method | |
| JP2003510727A (en) | High-speed on-chip windowing centroiding using photodiode-based CMOS imagers | |
| KR102640070B1 (en) | Pixel size reduction method for event-driven sensors | |
| CN108712621B (en) | Moving object detection circuit based on memristor and CMOS | |
| US5917960A (en) | Image correlator, an image processing apparatus using the same, and a signal adder used in the image correlator | |
| CN112788262B (en) | Image signal detection circuit, control method, and motion detection method | |
| Liu et al. | A low-power multifunctional CMOS sensor node for an electronic facade | |
| CN114302081B (en) | Motion detection circuit | |
| EP3267678B1 (en) | Pixel acquisition circuit, image sensor and image acquisition system | |
| Mehta et al. | Normal optical flow measurement on a CMOS APS imager | |
| CN109584278B (en) | Target identification device and method | |
| US5373295A (en) | Digital interface circuit for high dynamic range analog sensors | |
| CN209748512U (en) | Active load circuit based on fingerprint sensor acquisition array output stage | |
| KR20220143027A (en) | AI fused pixel sensor using memristors | |
| CN116918344A (en) | sensor device | |
| US20210058580A1 (en) | Imaging systems and methods for performing floating gate readout via distributed pixel interconnects for analog domain regional feature extraction | |
| CN114092503A (en) | Detection circuit, chip and electronic equipment | |
| CN108198204B (en) | Zero-threshold nuclear density estimation moving target detection method | |
| Li et al. | Human Action Recognition Based on State Detection in Low-resolution Infrared Video | |
| CN115471917B (en) | Gesture detection and recognition system and method | |
| CN206042184U (en) | High dynamic biCMOS image sensor and pixel thereof | |
| Rangkuti et al. | Reliable Batik Image Classification: Mulwin-LBP Algorithm and Deep Neural Network | |
| CN106791509A (en) | Snowslide image focal plane sensor with high voltage protective |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |