CN116233630B - Method, equipment and storage medium for removing ripple noise of CMOS sensor power supply - Google Patents
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Abstract
The invention provides a method for removing ripple noise of a CMOS sensor power supply, which comprises the steps of obtaining a first RAW image matrix and converting the first RAW image matrix into a first frequency domain matrix after calibrating dark current of any matrix under the multiplication benefit of 1~S shot in a dark environment of a laboratory; further converting into a first spectrum matrix and a first phase spectrum matrix; establishing a fast filter matrix and denoising the first frequency spectrum matrix to obtain a second frequency spectrum matrix; sequentially executing the steps on the RAW image matrix under the 1~S multiplication benefit to obtain a rapid filter matrix set; regenerating a second RAW image matrix, converting the second RAW image matrix into a second frequency domain matrix, generating a third frequency spectrum matrix and a second phase spectrum matrix, acquiring a fast filter matrix, generating a fourth frequency spectrum matrix, and calculating with the second phase spectrum matrix to obtain the third frequency domain matrix; and restoring the third frequency domain matrix into a spatial domain matrix, thereby obtaining the RAW image after removing the power supply ripple noise. According to the method, the power supply ripple wave under the corresponding analog gain is removed, and the RAW image with higher quality is obtained.
Description
Technical Field
The invention relates to the field of electronic information, in particular to a method, equipment and storage medium for removing power supply ripple noise of a CMOS sensor.
Background
When the CMOS sensor is used for carrying out row exposure, the exposure intensity of each row is caused to have deviation by a power supply ripple wave, so that stripe noise exists in an obtained image, the stripe noise is particularly obvious under higher precision or high analog gain, the image quality is reduced in subsequent processing, and the accuracy in the fields of positioning, identification and the like requiring high precision images is further affected.
The technical scheme of the method is mainly to manually touch two ends of an output pin of a single board power supply module by using an oscilloscope probe, so that the power supply ripple noise can not be accurately measured due to instability of the oscilloscope probe, and the problems of labor and time consumption and low efficiency are solved.
Therefore, an effective elimination scheme is necessary to be provided for the ripple noise of the power supply, so that the long-standing technical barriers in the prior art are solved, the power supply conversion efficiency and the voltage stability are improved, and the safety of various application scenes is further improved.
Disclosure of Invention
In order to solve the technical barriers for a long time in the prior art, the invention provides a method, equipment and a storage medium for removing power supply ripple noise of a CMOS sensor, which have the following specific technical scheme:
in a first aspect, the present invention provides a method for removing ripple noise of a CMOS sensor power supply, comprising the steps of:
step 101: shooting 1~S S matrixes under multiplication under a dark environment of a laboratory, and acquiring a first RAW image matrix under any gain after calibrating dark current according to a universal ISP (Internet service provider) debugging method for the matrix under the gain;
step 102: converting the first RAW image matrix into a first frequency domain matrix;
step 103: converting the first frequency domain matrix into a first frequency spectrum matrix and a first phase spectrum matrix;
step 104: establishing and obtaining a fast filter matrix, and denoising the first frequency spectrum matrix to obtain a second frequency spectrum matrix;
step 105: sequentially executing steps 102-104 on RAW image matrixes after dark current calibration according to a general ISP (Internet service provider) debugging method under the multiplication of 1~S to obtain a rapid filter matrix set;
step 106: regenerating a second RAW image matrix after dark current is calibrated according to a general ISP debugging method under a gain Q, converting the second RAW image matrix into a second frequency domain matrix, and obtaining a third frequency spectrum matrix and a second phase spectrum matrix, wherein the gain;
step 107: acquiring a fast filter matrix under the gain Q in the step 105, and generating a fourth spectrum matrix;
step 108: calculating the fourth frequency spectrum matrix and the second phase spectrum matrix to obtain a third frequency domain matrix;
step 109: and restoring the third frequency domain matrix into a spatial domain matrix, thereby obtaining the RAW image after removing the power supply ripple noise.
Further, the RAW image matrix has the following format under the i multiplication benefit:
wherein x and y are coordinate axes of a space domainThe element of (2) is->The RAW image resolution is +.>。
Wherein u, v is the frequency domain coordinate axis, j is the imaginary unit, and the coordinateThe element of (2) is->。
Further, the first spectrum matrixAnd a first phase spectrum matrix->The conversion is carried out by adopting the following modes: the first frequency domain matrix->Is>Is converted according to the following formula to generate a first spectrum matrixAnd a first phase spectrum matrix->:
Wherein,,for the first frequency domain matrix->At->The real part of complex element, < >>For the first frequency domain matrix->At->Is the imaginary part of the complex element.
Further, the filter is constructed in the following manner: for the first spectrum matrixSequentially traversing the v axis +.>All points of the interval->Define a spectral threshold +.>,/>If the point is on the v-axisThere is->If true, define->For the first frequency domain matrix->Obtaining a coordinate set satisfying the electric noise frequency:
the fast filter is applied to a first frequency spectrum matrix to achieve the purpose of removing noise, and specifically comprises the following steps: will beAnd->Two matrices are associated with each other +.>Element multiplication at coordinates, this operation is for the first spectral matrix +.>Setting the amplitude value belonging to the noise source frequency coordinate set to zero, thereby generating a second spectrum matrix for removing noise>。
Further, the fast filter matrix set is obtained by: RAW image matrix set with 1~S times gainSteps 102-104 are executed to obtain a fast filter matrix set for removing the frequency domain noise frequency points under the corresponding gain:
further, the third spectrum matrix and the second spectrum matrix are obtained by the following method: with analog gainExposing to generate a RAW image matrix, and performing dark current calibration to obtain a second RAW image matrix +.>The resolution of the image is +.>Converting the second RAW image matrix into a second frequency domain matrix to further obtain a second phase spectrum matrix +.>And a third spectral matrix->From i=q value, get +.>Concentrate corresponding +.>Generating a fourth spectral matrix with noise removed>;
The third frequency domain matrix is obtained in the following manner: for the fourth spectrum matrixAnd a second phase spectrum matrix->Every coordinate +.>The elements of (2) are converted according to the following formula to generate a denoised third frequency domain matrix +.>:
Further, the RAW image matrix after removing the power supply ripple is obtained by the following method: for the third frequency domain matrixEvery coordinate +.>Is converted to each coordinate +.>Is used for generating a spatial domain matrix after removing power supply ripple noise>:
In a second aspect, the present invention provides a computer readable storage medium storing a computer program which when executed by a processor implements the steps of the method of CMOS sensor power supply ripple noise removal of any one of the first aspects.
In a third aspect, the present invention provides a CMOS sensor power supply ripple noise removal device comprising:
one or more processors;
a memory; and
one or more computer programs, wherein the one or more computer programs are stored in the memory and configured to be executed by the one or more processors, which when executing the computer programs, implement the steps of the method of CMOS sensor power supply ripple noise removal of any one of the first aspect.
According to the technical scheme, based on the laboratory environment calibration step, the space domain is converted into the frequency domain, the noise frequency point is determined by using the threshold value, the fast filter matrix is further generated, the filtered frequency domain is rebuilt and restored to the space domain, the power supply ripple removal under the corresponding analog gain is realized, and the RAW image with higher quality is obtained.
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Fig. 1: the invention relates to a flow chart of a power supply ripple noise removing method of a CMOS sensor.
Fig. 2: the invention relates to a schematic diagram of a power supply ripple noise removing device of a CMOS sensor.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments.
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1, a flow chart of a method for removing ripple noise of a power supply of a CMOS sensor according to the present invention includes the following steps:
step 101: shooting 1~S under the dark environment of a laboratory, wherein S matrixes under the multiplication benefit, for example S=16, and acquiring a first RAW image matrix under any gain after calibrating dark current of the matrix under the gain according to a universal ISP (Internet service provider) debugging method; the resolution of the image is:
The matrix format of any one RAW image under the benefit of i multiplication is as follows:
Step 102: the first RAW image matrix is converted into a first frequency domain matrix, specifically: mathematical formulas based on the following discrete fourier transforms:
and applies a general fast Fourier transform algorithm to generate a corresponding first frequency domain matrix:
Wherein u, v is the frequency domain coordinate axis, j is the imaginary unit, and the coordinateThe element of (2) is->;
Step 103: converting the first frequency domain matrix into a first frequency spectrum matrix and a first phase spectrum matrix, in particular: matrix the frequency domainIs>The elements of (2) are transformed according to the following formula to generate a first spectral matrix +.>And a first phase spectrum matrix->:
Wherein,,for the first frequency domain matrix->At->The real part of complex element, < >>For the first frequency domain matrix->At->An imaginary part of the complex element;
step 104: establishing and obtaining a fast filter matrix, denoising the first frequency spectrum matrix to obtain a second frequency spectrum matrix, wherein when a CMOS image is subjected to line exposure, analog voltage ripple causes deviation of exposure intensity of each line due to electric appliances or process problems, and each line has inconsistent brightness under a pure dark environment, so that an electric noise signal which is represented as transverse stripes on an obtained RAW image corresponds to a certain point on a v axis (u=0) of a frequency domain, the frequency spectrum data value of the electric noise signal is obviously higher than the values of other positions, namely noise frequency points, and the noise frequency points need to be extracted and eliminated, and the method comprises the following steps:
for the first spectrum matrixSequentially traversing the v axis +.>All points of the interval->Define a spectral threshold +.>For example +.>If a certain point on the v-axis +.>Has the following componentsIf true, define->For the first frequency domain matrix->And then obtaining a coordinate set meeting the electric noise frequency:
the fast filter is applied to the first frequency spectrum matrix to achieve the purpose of removing noise, and specifically comprises the following steps: will beAnd->Two matrices are associated with each other +.>Element multiplication at coordinates, this operation is for the first spectral matrix +.>Setting the amplitude value belonging to the noise source frequency coordinate set to zero, thereby generating a second spectrum matrix for removing noise>;
Step 105: step 102-104 is executed on RAW image matrix after dark current calibration according to general ISP debugging method under 1~S multiplication in sequence, and a rapid filter matrix set is obtained, specifically: RAW image matrix set with 1~S times gainThe fast filter filtering is carried out, so that a fast filter matrix set for removing the frequency domain noise frequency points under the corresponding gain is obtained:
step 106: regenerating a second RAW image matrix after dark current calibration according to a general ISP debugging method under the gain Q, converting the second RAW image matrix into a second frequency domain matrix, and obtaining a third frequency spectrum matrixAnd a second phase spectrum matrix->The method specifically comprises the following steps: in the application fieldUnder the scene, with a certain analog gain +.>Exposing to generate a RAW image matrix, and performing dark current calibration to obtain a second RAW image matrix +.>The resolution of the image is +.>Converting the second RAW image matrix into a second frequency domain matrix, e.g., q=12;
step 107: the fast filter matrix under the gain Q in step 105 is obtained, and a fourth spectrum matrix is generated, specifically: from the i=q value, we obtainConcentrate corresponding +.>Generating a fourth spectral matrix with noise removed>;
Step 108: the third frequency domain matrix is obtained by calculating the fourth frequency spectrum matrix and the second phase spectrum matrix, specifically:
for the fourth spectrum matrixAnd a second phase spectrum matrix->Every coordinate +.>The elements of (2) are transformed according to the following mathematical formula to generate a denoised third frequency domain matrix +.>:
Step 109: restoring the third frequency domain matrix into a spatial domain matrix, thereby obtaining a RAW image after removing power supply ripple noise, specifically comprising the following steps: for the third frequency domain matrixEvery coordinate +.>Is converted to each coordinate +.>Is used for generating a spatial domain matrix after removing power supply ripple noise>:
Wherein,,and the RAW image matrix after the power supply ripple is removed is used for removing the power supply ripple under the corresponding analog gain, so that a RAW image with higher quality is obtained.
With further reference to fig. 2, a schematic diagram of a CMOS sensor power supply ripple noise removal device of the present invention, the CMOS sensor power supply ripple noise removal device 10 of the present invention further comprises one or more memories 20 and one or more processors 30, wherein the one or more computer programs are stored in the memories 20 and configured to be executed by the one or more processors 30, the processor 30 implementing the steps of the CMOS sensor power supply ripple noise removal method when executing the computer programs.
Those of ordinary skill in the art will appreciate that all or part of the steps in the various methods of the above embodiments may be implemented by a program to instruct related hardware, the program may be stored in a computer readable storage medium, and the storage medium may include: read Only Memory (ROM), random access Memory (RAM, random Access Memory), magnetic or optical disk, and the like.
For the foregoing method embodiments, for simplicity of explanation, the methodologies are shown as a series of acts, it is to be understood and appreciated by one of ordinary skill in the art that the claimed subject matter is not limited by the order of acts, as some steps may, in accordance with the present subject matter, occur in other orders and concurrently, and that the embodiments described herein are presented to a person of ordinary skill in the art with reference to the preferred embodiments, and that the acts and modules are not necessarily required by the present subject matter.
The steps in the method of each embodiment of the application can be sequentially adjusted, combined and deleted according to actual needs, and the technical features described in the embodiments can be replaced or combined.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (10)
1. A method for removing ripple noise of a power supply of a CMOS sensor, comprising the steps of:
step 101: shooting S matrixes under 1-S multiplication benefit in a dark environment of a laboratory, and acquiring a first RAW image matrix under any gain after calibrating dark current of the matrix under the gain according to a universal ISP (Internet service provider) debugging method;
step 102: converting the first RAW image matrix into a first frequency domain matrix;
step 103: converting the first frequency domain matrix into a first frequency spectrum matrix and a first phase spectrum matrix;
step 104: establishing and obtaining a fast filter matrix, and denoising the first spectrum matrix to obtain a second spectrum matrix, wherein the filter is constructed in the following way: for the first spectrum matrix F i (u, v) traversing sequentially on the v-axis [0, N-1 ]]Interval ofAll points { v 0 ,v 1 ,...v N-1 -defining a spectral threshold delta i ,δ i ∈[32,255]If the point on the v-axis (0, v mi ),v mi ∈{v 0 ,v 1 ,...v N-1 Has F i (0,v mi )>δ i If true, define (0, v mi ) For the first frequency domain matrix P i The electrical noise frequency coordinates of (u, v) resulting in a set of coordinates that satisfy the electrical noise frequency:
{(0,v m0 ),(0,v m1 ),…(0,v mk )},mk<N-1;
a fast filter is then constructed:where i=1,..s, u, v are frequency domain coordinate axes, the RAW image resolution is n×m;
step 105: 102-104 steps are sequentially executed on RAW image matrixes after dark current is calibrated according to a general ISP (Internet service provider) debugging method under the multiplication benefit of 1-S, and a rapid filter matrix set is obtained;
step 106: regenerating a second RAW image matrix after dark current is calibrated according to a general ISP debugging method under a gain Q, converting the second RAW image matrix into a second frequency domain matrix, and obtaining a third frequency spectrum matrix and a second phase spectrum matrix, wherein the gain Q is E [1, S ];
step 107: acquiring a fast filter matrix under the gain Q in the step 105, and generating a fourth spectrum matrix;
step 108: calculating the fourth frequency spectrum matrix and the second phase spectrum matrix to obtain a third frequency domain matrix;
step 109: and restoring the third frequency domain matrix into a spatial domain matrix, thereby obtaining the RAW image after removing the power supply ripple noise.
4. A method for removing ripple noise of a CMOS sensor power supply according to claim 3, wherein the first spectral matrix F i (u, v) and a first phase spectrum matrix phi i (u, v) is converted in the following manner: matrix P of the first frequency domain i The element of each coordinate (u, v) of (u, v) is transformed according to the following formula to generate a first spectral matrix F i (u, v) and a first phase spectrum matrix phi i (u,v):
Wherein Re [ P ] i (u,v)]For the first frequency domain matrix P i (u, v) the real part of the complex element at (u, v), im [ P ] i (u,v)]For the first frequency domain matrix P i (u, v) the imaginary part of the complex element at (u, v).
5. As set forth in claim 4The method for removing the ripple noise of the power supply of the CMOS sensor is characterized in that the rapid filter is further applied to a first frequency spectrum matrix to achieve the purpose of removing the noise, and specifically comprises the following steps: will H i (u, v) and F i The elements of the (u, v) two matrices at each corresponding (u, v) coordinate are multiplied, this operation being for a first spectral matrix F i (u, v) zeroing amplitude values belonging to the noise source frequency coordinate set, thereby generating a noise-removed second spectrum matrix
6. The method of CMOS sensor power supply ripple noise removal of claim 5, wherein the set of fast filter matrices is obtained by: RAW image matrix set p with 1-S times gain 1 (x,y),p 2 (x,y),...p S (x, y) all execute steps 102-104 to obtain a fast filter matrix set for removing frequency domain noise frequency points under the corresponding gain:
{H i (u,v)};i=1,2,...,S。
7. the method of CMOS sensor power supply ripple noise removal of claim 6, wherein the third spectral matrix and the second spectral matrix are obtained by: with analog gain Q.epsilon.1, S]Exposing to generate a RAW image matrix, and calibrating dark current to obtain a second RAW image matrix p Q (x, y) converting the second RAW image matrix to a second frequency domain matrix with an image resolution of N×M, further obtaining a second phase spectrum matrix phi Q (u, v) and a third spectral matrix F Q (u, v) obtaining { H } from the i=Q value i (u, v) } sets of corresponding H Q Generating a fourth spectral matrix with noise removed
The third frequency domain matrix is obtained in the following manner: for the fourth spectrum matrixAnd a second phase spectrum matrix phi Q (u, v) the elements of each coordinate (u, v) are transformed according to the following formula to generate a denoised third frequency domain matrix +.>
8. The method for removing power supply ripple noise of the CMOS sensor according to claim 7, wherein the RAW image after removing the power supply ripple noise is obtained by: for the third frequency domain matrixThe element of each coordinate (u, v) is converted into the element of each coordinate (x, y) according to the following mathematical formula to generate a space domain matrix after removing the power supply ripple noise
9. A computer readable storage medium storing a computer program, characterized in that the computer program when executed by a processor implements the steps of the method of CMOS sensor power supply ripple noise removal according to any one of claims 1 to 8.
10. A CMOS sensor power supply ripple noise removal device, comprising:
one or more processors;
a memory; and
one or more computer programs, wherein the one or more computer programs are stored in the memory and configured to be executed by the one or more processors, characterized in that the steps of the method of CMOS sensor power supply ripple noise removal according to any one of claims 1 to 8 are implemented when the computer programs are executed by the processors.
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