CN113452939A - Imaging effect evaluation method under TDICMOS rolling line period - Google Patents

Imaging effect evaluation method under TDICMOS rolling line period Download PDF

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CN113452939A
CN113452939A CN202110727790.3A CN202110727790A CN113452939A CN 113452939 A CN113452939 A CN 113452939A CN 202110727790 A CN202110727790 A CN 202110727790A CN 113452939 A CN113452939 A CN 113452939A
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CN113452939B (en
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余达
薛栋林
薛旭成
李国宁
于善猛
赵宇宸
张择书
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Changchun Institute of Optics Fine Mechanics and Physics of CAS
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    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
    • H04N25/70—SSIS architectures; Circuits associated therewith
    • H04N25/76—Addressed sensors, e.g. MOS or CMOS sensors
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    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
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Abstract

A method for evaluating imaging effect under a TDICMOS rolling line period relates to the technical field of TDICMOS imaging effect evaluation, and comprises the steps of firstly counting high level starting and ending positions of each driving signal and the times of rising edges or falling edges of the same driving signal in one line period according to jump edge positions of charge transfer signals obtained under different line periods; then comparing the rising edge position with the falling edge position one by one according to the charge transfer signals, and recalculating the rising edge position; then calculating the position of the mass center of each charge transfer to be equal to the sum of the positions of the rising edge and the falling edge; calculating the distance between the centroids in each step; and finally, calculating to obtain a current dynamic transfer function value according to the phase number of the charge transfer and the distance of each mass center under the corresponding line period. According to the method, the centroid position can be conveniently calculated by judging the relative positions of the rising edge and the falling edge, and errors caused by redundant conversion are avoided.

Description

Imaging effect evaluation method under TDICMOS rolling line period
Technical Field
The invention relates to a TDICMOS imaging effect evaluation method, in particular to a TDICMOS rolling line period imaging effect evaluation method.
Background
When a multispectral TDICMOS detector is used for imaging, in order to obtain high-dynamic transfer function imaging, the charge transfer process needs to be evenly divided equally as much as possible. For imaging application of multi-spectral TDICMOS, in order to avoid mutual interference among spectral bands, sensitive areas among the spectral bands are avoided, so that the whole charge transfer process is not equally divided, and in the process of rail rolling line period imaging, the on-rail dynamic transfer function is changed due to different equally divided degrees of charge transfer in each step.
Disclosure of Invention
The invention provides an imaging effect evaluation method under a TDICMOS rolling line period, aiming at solving the problem that in the prior art, in the process of imaging the rolling line period on a rail, the dynamic transfer function of the rail is changed due to different charge transfer equipartition degrees.
The imaging effect evaluation method under the TDICMOS rolling line period is realized by the following steps:
step one, according to the jump edge positions of charge transfer signals obtained under different line periods, counting the high level starting position and the high level ending position of each driving signal and the times of rising edges or falling edges of the same driving signal in one line period; comparing the positions of rising edges and falling edges of the charge transfer signals one by one, and recalculating the position of the rising edge; the method specifically comprises the following steps:
when the number of rising edges or falling edges occurring in one line period is 1;
position pos at which charge transfer signal takes a rising edgerisingAnd falling edge position posfallingIf the rising edge position is less than the falling edge position, pos is determinedrising＜posfalilnNew rising edge position posnew_risingComprises the following steps: posnew_rising＝posrisin(ii) a Pos if the rising edge position is greater than the falling edge positionrising＞posfallingThen the new rising edge position is adjusted to: posnew_rising＝nfreq-posrisingIn the formula, nfreqIs the current line period length;
when the number of rising edges or falling edges occurring in one row period is more than 1;
when the charge transfer signal is low at the start of one line period, the rising edge position posrisingWithout change, i.e. posnew_rising＝posrising；
When the charge transfer signal is at high level at the initial position of a line period, a high level area combination is formed by adopting a first falling edge position and an nth rising edge position; the high level in the combination corresponds to the first new rising edge position posnew_rising_first＝nfreq-posrising_nIn the formula, posrising_nFor the rising edge position that occurs last in one row period, i.e.: the nth rising edge position;
the first rising edge position and the second falling edge position form a high level area combination, the second rising edge position and the third falling edge position form a high level area combination, and the combination is not changed until the n-1 th rising edge position and the n-th falling edge position form a high level area combination; the rising edge and falling edge positions of the new combination are unchanged;
step two, calculating the centroid position of each charge transfer, namely: the high level center of the charge transfer signal is equal to half of the sum of the rising edge and the falling edge; then calculating the distance between the mass center positions of each charge transfer;
obtaining a dynamic transfer function value corresponding to the current line period according to the phase number of the charge transfer and the distance between the mass center positions of the charge transfer under the corresponding line period, and evaluating the change range of the transfer function applied in the track according to the change ranges of the dynamic transfer function values under all the line periods; the on-orbit imaging effect, i.e. the sharpness of the acquired image, can be evaluated by calculating the average of the dynamic transfer function values for all line periods.
The invention has the beneficial effects that:
1. according to the method, the centroid position can be conveniently calculated by judging the relative positions of the rising edge and the falling edge, and errors caused by redundant conversion are avoided;
2. the invention can learn the maximum dynamic transfer function and the variation range of the dynamic transfer function which can be obtained by the charge transfer algorithm in advance by calculating the dynamic transfer function under the full period.
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Fig. 1 is a schematic block diagram of an imaging effect evaluation method under a TDICMOS rolling line period according to the present invention.
Detailed Description
With reference to fig. 1, the method for evaluating imaging effect in a rolling line period of a TDICMOS according to the embodiment of the present invention first calculates the high level start and end positions of each driving signal and the number of times that a rising edge or a falling edge occurs in the same driving signal in a line period according to the jump edge positions of charge transfer signals obtained in different line periods; then comparing the rising edge position with the falling edge position one by one according to the charge transfer signals, and recalculating the rising edge position; then calculating the position of the mass center of each charge transfer to be equal to the sum of the positions of the rising edge and the falling edge; then calculating the distance between the centroids in each step; and finally, calculating to obtain a current dynamic transfer function value according to the phase number of the charge transfer and the distance of each mass center under the corresponding line period.
The method is realized by the following steps based on the method:
step one, according to the jump edge positions of charge transfer signals obtained under different line periods, counting the high level starting position and the high level ending position of each driving signal and the times of rising edges or falling edges of the same driving signal in one line period; comparing the positions of rising edges and falling edges of the charge transfer signals one by one, and recalculating the position of the rising edge; the method specifically comprises the following steps:
when the number of rising edges or falling edges occurring in one line period is 1;
position pos at which charge transfer signal takes a rising edgerisingAnd falling edge position posfallingIf the rising edge position is less than the falling edge position, pos is determinedrising＜posfalilnNew rising edge position posnew_risingComprises the following steps: posnew_rising＝posrisin(ii) a Pos if the rising edge position is greater than the falling edge positionrising＞posfallingThen the new rising edge position is adjusted to: posnew_rising＝nfreq-posrisingIn the formula, nfreqIs the current line period length;
when the number of rising edges or falling edges occurring in one row period is more than 1;
when the charge transfer signal is low at the start of one line period, the rising edge position posrisingWithout change, i.e. posnew_rising＝posrising；
When the charge transfer signal is at high level at the initial position of a line period, a high level area combination is formed by adopting a first falling edge position and an nth rising edge position; the high level in the combination corresponds to the first new rising edge position posnew_rising_first＝nfreq-posrising_nIn the formula, posrising_nFor the rising edge position that occurs last in one row period, i.e.: the nth rising edge position;
the first rising edge position and the second falling edge position form a high level area combination, the second rising edge position and the third falling edge position form a high level area combination, and the combination is not changed until the n-1 th rising edge position and the n-th falling edge position form a high level area combination; the rising edge and falling edge positions of the new combination are unchanged;
step two, calculating the centroid position of each charge transfer, namely: the high level center of the charge transfer signal is equal to half of the sum of the rising edge and the falling edge; then calculating the distance between the mass center positions of each charge transfer;
the position formula of the centroid is:
Figure BDA0003138167060000041
distance between centroids li＝poscentroid_i-poscentroid_i-1(ii) a Middle poscentroid_iIs the high level center of the ith charge transfer signal, i.e.: the centroid position of the ith charge transfer.
Obtaining a dynamic transfer function value corresponding to the current line period according to the phase number of the charge transfer and the distance between the mass center positions of the charge transfer under the corresponding line period, and evaluating the change range of the transfer function applied in the track according to the change ranges of the dynamic transfer function values under all the line periods; the on-orbit imaging effect, i.e. the sharpness of the acquired image, can be evaluated by calculating the average of the dynamic transfer function values for all line periods.
In this embodiment, the number of phases q of the charge transfer is mr/p, where m is the number of charge transfers, r is the number of times that each charge transfer signal has a rising edge or a falling edge in one line period, and p is the number of groups in which each charge transfer signal has the same number.
According to the phase number q of charge transfer and the distance l of each centroid under the corresponding line periodiCalculating to obtain the dynamic transfer function value under the current line period
Figure BDA0003138167060000042
In this embodiment, the imaging system that implements the imaging effect evaluation method is further included, and the imaging system includes an imaging controller and a camera imaging unit; the camera imaging unit comprises a driving and level conversion circuit, a detector, a 2711 module and an imaging FPGA; the imaging FPGA in the camera imaging unit comprises a line period processing module, a time sequence driving module and a data training and integrating module; an asynchronous system is arranged between the imaging controller and the camera imaging unit;
the imaging controller outputs a main backup line periodic signal, a backup line periodic signal and a main backup identification signal to a camera imaging unit; the line period processing module selects and uses the main backup line period signal or the backup line period signal to generate a panchromatic line starting pulse, a multispectral line starting pulse, panchromatic line period length data and multispectral line period length data required by the time sequence driving module according to the received main backup identification signal;
setting the cycle length of the panchromatic row starting pulse to be the same as the panchromatic row cycle signal length, setting the panchromatic row cycle signal length to be the same as the main backup row cycle signal length or the backup row cycle signal length selected according to the main backup identification signal, setting the width of the panchromatic row starting pulse to be equal to or more than 1 pixel clock cycle, and setting the rising edge position time of the panchromatic row starting pulse to lag the panchromatic row cycle length data updating time;
the multispectral row starting pulse has the same period length as the multispectral row periodic signal length, and the multispectral row periodic signal length is the same as the accumulated value of the four adjacent main backup row periodic signal lengths or the accumulated value of the four adjacent backup row periodic signal lengths selected according to the main backup identification signals;
the width of the multispectral row starting pulse is equal to or more than 1 pixel clock period, and the rising edge position time lags behind the multispectral row period length data updating time;
the lag time is greater than or equal to 1 pixel clock cycle and less than 20 pixel clock cycles;
the transfer and control level signal output by the time sequence driving module is converted into a transfer and control driving signal through a driving and level conversion circuit and then is sent to a detector;
the serial image data output by the detector is output to the 2711 module through the data training and integrating module and is finally output through the data transmission interface.
In this embodiment, the multispectral line-period signal length B1There are two values; when the length of the panchromatic line periodic signal is a constant value, the length of the multispectral line periodic signal is B14 p; multispectral line period signal length B when panchromatic line period is of different values1＝p1+p2+p3+p4；p1、p2、p3、p4Four panchromatic colors adjacent to each otherThe line period signal length, p, is a constant panchromatic line period signal length.
In this embodiment, the panchromatic row start pulse and the multispectral row start pulse respectively reset a panchromatic time sequence counter and a multispectral time sequence counter in the time sequence driving module; the jumping edge updating time of each panchromatic driving control signal is the time when the count value of the panchromatic time sequence counter is 0; and the updating time of the jumping edge of each multispectral driving control signal is the time when the counting value of the multispectral time sequence counter is 0.
In this embodiment, the position of the transition edge of each transition and control driving signal output by the driving and level converting circuit is determined according to the currently input panchromatic line period length p and the multispectral line period length B1The calculation is carried out, the region of the position of the transition edge available for the panchromatic transfer and control drive signals is (3, p), and the region of the position of the transition edge available for the multispectral transfer and control drive signals is (3, B)1-3); when the jump edge position of the panchromatic image obtained through calculation is 0-3, setting the jump edge position to be 3; when the jump edge position of the panchromatic image obtained through calculation is in the range from p-3 to p-1, setting the jump edge position as p-3;
when the hopping edge position of the multispectral transfer and control driving signal obtained through calculation is 0-3, setting the hopping edge position to be 3; when the jump edge position of the multispectral transfer and control drive signal obtained by calculation is in B1-3～B1When the position of the jump edge is 1, the position of the jump edge is set to be B1-3。
In the embodiment, the detector adopts a TDICMOS detector of a long-light-core company; the 2711 module adopts a TLK2711 chip; the driving and level conversion circuit is mainly based on a level conversion chip ISL 7457; the imaging controller mainly adopts an FPGA and a refreshing chip of Shanghai Compound denier microelectronics company; the imaging FPGA uses XilInx XQ5VFX 100T.

Claims (9)

  1. The method for evaluating the imaging effect under the TDICMOS rolling line period is characterized by comprising the following steps: the method is realized by the following steps:
    step one, according to the jump edge positions of charge transfer signals obtained under different line periods, counting the high level starting position and the high level ending position of each driving signal and the times of rising edges or falling edges of the same driving signal in one line period; comparing the positions of rising edges and falling edges of the charge transfer signals one by one, and recalculating the position of the rising edge; the method specifically comprises the following steps:
    when the number of rising edges or falling edges occurring in one line period is 1;
    position pos at which charge transfer signal takes a rising edgerisingAnd falling edge position posfallingIf the rising edge position is less than the falling edge position, pos is determinedrising＜posfalilnNew rising edge position posnew_risingComprises the following steps: posnew_rising＝posrising(ii) a Pos if the rising edge position is greater than the falling edge positionrising＞posfallingThen the new rising edge position is adjusted to: posnew_rising＝nfreq-posrisingIn the formula, nfreqIs the current line period length;
    when the number of rising edges or falling edges occurring in one row period is more than 1;
    when the charge transfer signal is low at the start of one line period, the rising edge position posrisingWithout change, i.e. posnew_rising＝posrising；
    When the charge transfer signal is at high level at the initial position of a line period, a high level area combination is formed by adopting a first falling edge position and an nth rising edge position; the high level in the combination corresponds to the first new rising edge position posnew_rising_first＝nfreq-posrising_nIn the formula, posrising_nFor the rising edge position that occurs last in one row period, i.e.: the nth rising edge position;
    the first rising edge position and the second falling edge position form a high level area combination, the second rising edge position and the third falling edge position form a high level area combination, and the combination is not changed until the n-1 th rising edge position and the n-th falling edge position form a high level area combination; the rising edge and falling edge positions of the new combination are unchanged;
    step two, calculating the centroid position of each charge transfer, namely: the high level center of the charge transfer signal is equal to half of the sum of the rising edge and the falling edge; then calculating the distance between the mass center positions of each charge transfer;
    obtaining a dynamic transfer function value corresponding to the current line period according to the phase number of the charge transfer and the distance between the mass center positions of the charge transfer under the corresponding line period, and evaluating the change range of the transfer function applied in the track according to the change ranges of the dynamic transfer function values under all the line periods; the on-orbit imaging effect, i.e. the sharpness of the acquired image, can be evaluated by calculating the average of the dynamic transfer function values for all line periods.
  2. 2. The method for evaluating imaging effect under rolling line period of TDICMOS according to claim 1, wherein: in step two, the position of the center of mass
    Figure FDA0003138167050000021
  3. 3. The method for evaluating imaging effect under rolling line period of TDICMOS according to claim 1, wherein: distance between centroids li＝poscentroid_i-poscentroid_i-1(ii) a Middle poscentroid_iIs the high level center of the ith charge transfer signal, i.e.: the centroid position of the ith charge transfer.
  4. 4. The method for evaluating imaging effect under rolling line period of TDICMOS according to claim 1, wherein: in the third step, the phase number q of the charge transfer is mr/p, where m is the number of charge transfers, r is the number of times that each charge transfer signal has a rising edge or a falling edge in one line period, and p is the same group number of the charge transfer signals.
  5. 5. The method for evaluating imaging effect under rolling line period of TDICMOS according to claim 1, wherein:
    according to the phase number q of charge transfer and the distance l of each centroid under the corresponding line periodiCalculating to obtain the dynamic transfer function value under the current line period
    Figure FDA0003138167050000022
  6. 6. The imaging system of the TDICMOS rolling line period imaging effect evaluation method according to claim 1, wherein:
    the imaging system includes an imaging controller and a camera imaging unit; the camera imaging unit comprises a driving and level conversion circuit, a detector, a 2711 module and an imaging FPGA; the imaging FPGA in the camera imaging unit comprises a line period processing module, a time sequence driving module and a data training and integrating module; an asynchronous system is arranged between the imaging controller and the camera imaging unit;
    the imaging controller outputs a main backup line periodic signal, a backup line periodic signal and a main backup identification signal to a camera imaging unit; the line period processing module selects and uses the main backup line period signal or the backup line period signal to generate a panchromatic line starting pulse, a multispectral line starting pulse, panchromatic line period length data and multispectral line period length data required by the time sequence driving module according to the received main backup identification signal;
    setting the cycle length of the panchromatic row starting pulse to be the same as the panchromatic row cycle signal length, setting the panchromatic row cycle signal length to be the same as the main backup row cycle signal length or the backup row cycle signal length selected according to the main backup identification signal, setting the width of the panchromatic row starting pulse to be equal to or more than 1 pixel clock cycle, and setting the rising edge position time of the panchromatic row starting pulse to lag the panchromatic row cycle length data updating time;
    the multispectral row starting pulse has the same period length as the multispectral row periodic signal length, and the multispectral row periodic signal length is the same as the accumulated value of the four adjacent main backup row periodic signal lengths or the accumulated value of the four adjacent backup row periodic signal lengths selected according to the main backup identification signals;
    the width of the multispectral row starting pulse is equal to or more than 1 pixel clock period, and the rising edge position time lags behind the multispectral row period length data updating time;
    the lag time is greater than or equal to 1 pixel clock cycle and less than 20 pixel clock cycles;
    the transfer and control level signal output by the time sequence driving module is converted into a transfer and control driving signal through a driving and level conversion circuit and then is sent to a detector;
    the serial image data output by the detector is output to the 2711 module through the data training and integrating module and is finally output through the data transmission interface.
  7. 7. The imaging system of claim 6, wherein:
    multispectral line-periodic signal length B1There are two values; when the length of the panchromatic line periodic signal is a constant value, the length of the multispectral line periodic signal is B14 p; multispectral line period signal length B when panchromatic line period is of different values1＝p1+p2+p3+p4；
    p1、p2、p3、p4Respectively, the lengths of the four adjacent panchromatic line periodic signals, and p is the length of the constant panchromatic line periodic signal.
  8. 8. The imaging system of claim 6, wherein:
    the panchromatic row starting pulse and the multispectral row starting pulse respectively reset a panchromatic time sequence counter and a multispectral time sequence counter in the time sequence driving module; the jumping edge updating time of each panchromatic driving control signal is the time when the count value of the panchromatic time sequence counter is 0; and the updating time of the jumping edge of each multispectral driving control signal is the time when the counting value of the multispectral time sequence counter is 0.
  9. 9. The imaging system of claim 6, wherein:
    the jump edge position of each transfer and control drive signal output by the drive and level conversion circuit is determined according to the currently input panchromatic row period length p and multispectral row period length B1The calculation is carried out, the region of the position of the transition edge available for the panchromatic transfer and control drive signals is (3, p), and the region of the position of the transition edge available for the multispectral transfer and control drive signals is (3, B)1-3); when the jump edge position of the panchromatic image obtained through calculation is 0-3, setting the jump edge position to be 3; when the jump edge position of the panchromatic image obtained through calculation is in the range from p-3 to p-1, setting the jump edge position as p-3;
    when the hopping edge position of the multispectral transfer and control driving signal obtained through calculation is 0-3, setting the hopping edge position to be 3; when the jump edge position of the multispectral transfer and control drive signal obtained by calculation is in B1-3～B1When the position of the jump edge is 1, the position of the jump edge is set to be B1-3。
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