CN110533686A - Line-scan digital camera line frequency and the whether matched judgment method of speed of moving body and system - Google Patents
Line-scan digital camera line frequency and the whether matched judgment method of speed of moving body and system Download PDFInfo
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Abstract
This application discloses a kind of line-scan digital camera line frequencies and the whether matched judgment method of speed of moving body and system, which comprises ajusts gridiron pattern target figure and is fixed on testee, the line frequency of line-scan digital camera and the movement velocity of object is arranged；Acquire the chessboard table images of line-scan digital camera shooting；Slant correction is carried out to chessboard table images；Detection obtains the Gray Level Jump area in chessboard table images, records the flag bit in Gray Level Jump area；The index value of all Gray Level Jumps is recorded according to the flag bit in Gray Level Jump area；The lateral side length and vertical edge length of chessboard table images are calculated according to index value；According to the matching degree of tessellated lateral side length and vertical edge length computation line-scan digital camera line frequency and speed of moving body.Judgment method provided by the present application carries out adopting figure as target using gridiron pattern, judges whether the line frequency of line-scan digital camera matches with the movement velocity of object by calculating the side length of target in shooting image, not only easy to operate, but also can obtain objective and accurate judgement.
Description
Technical field
This application involves line-scan digital camera technical field more particularly to a kind of line-scan digital camera line frequency and speed of moving body whether
Matched judgment method and system.
Background technique
Line-scan digital camera is the camera using line array sensor, acquires a line image every time, and the image of shooting is in " line " shape,
Several rows are spliced into piece image by the length with several k, must be requested that subject (or line-scan digital camera) is along picture altitude
Direction movement, has very high resolution ratio, is usually used in the detection neck of the elongated tested visual field, the very big visual field of needs or very high degree of precision
Domain.
Line-scan digital camera just necessarily requires to have between line-scan digital camera and object due to its characteristic, to continuously shot images opposite
Movement, usually line-scan digital camera is fixed, object of which movement, if the line frequency of the movement velocity of object and line-scan digital camera mismatches, is clapped
Object can deform in the image taken the photograph.Speed of moving body is if more than the line frequency of line-scan digital camera, then object is compressed, instead
It, if the movement velocity of object is less than the line frequency of line-scan digital camera, object is stretched.Only speed of moving body and linear array phase
The line frequency of machine matches, and just can guarantee that the object shot and does not have deformation.
But current one side major applications require not the matching of the line frequency of line-scan digital camera and the movement velocity of object
It is too stringent, even if on the other hand requiring the two matching, and by human eye subjective judgement, conclusion is not objective, is unable to judge accurately
Whether the line frequency of line-scan digital camera matches with the movement velocity of object.
Summary of the invention
This application provides a kind of line-scan digital camera line frequency and the whether matched judgment method of speed of moving body and system, with
Whether the line frequency of accurate judgement line-scan digital camera matches with the movement velocity of object.
In order to solve the above-mentioned technical problem, the embodiment of the present application discloses following technical solution:
In a first aspect, the embodiment of the present application discloses a kind of line-scan digital camera line frequency and whether speed of moving body is matched sentences
Disconnected method and system, which comprises
Gridiron pattern target figure is ajusted and is fixed on testee, the line frequency of line-scan digital camera and the movement speed of object are set
Degree；
Acquire the chessboard table images of the line-scan digital camera shooting；
Slant correction is carried out to the chessboard table images；
Detection obtains the Gray Level Jump area in the chessboard table images, records the flag bit in the Gray Level Jump area；
The index value of all Gray Level Jumps is recorded according to the flag bit in the Gray Level Jump area；
The lateral side length and vertical edge length of the chessboard table images are calculated according to the index value；
According to line-scan digital camera line frequency and speed of moving body described in the tessellated lateral side length and vertical edge length computation
Matching degree.
Optionally, the chessboard table images of the line-scan digital camera shooting, including one width gridiron pattern of acquisition are acquired in line-scan digital camera
The image in visual field center, or one width gridiron pattern of acquisition are full of the image of line-scan digital camera visual field.
Optionally, slant correction is carried out to the chessboard table images, comprising:
Detection obtains the tilt angle theta of the chessboard table images；
Obtain the coordinate (x of target point in the chessboard table images0,y0), x0And y0The target point is respectively indicated described
Line index and column index in chessboard table images；
The coordinate of ground point (x, y) after correction is calculated according to formula (1)；
Wherein, x and y respectively indicates the line index of target point and column index after slant correction.
Optionally, detection obtains the Gray Level Jump area in the chessboard table images, records the mark in the Gray Level Jump area
Position, comprising:
Obtain the gray value of current pixel location point；
Calculate the absolute value of the difference of the gray value of the current pixel location point and the gray value of adjacent position pixel；
Judge whether the absolute value is greater than the threshold value of setting；
If the absolute value is greater than the threshold value of the setting, then it is assumed that current location is Gray Level Jump area；
According to the size of the gray value of the current pixel location point and the gray value of adjacent position pixel, described in record
The flag bit in Gray Level Jump area.
Optionally, according to the size of the gray value of the current pixel location point and the gray value of adjacent position pixel,
Record the flag bit in the Gray Level Jump area, comprising:
Judge whether the gray value of the current pixel location point is greater than the gray value of adjacent position pixel；
If the gray value of the current pixel location point is greater than the gray value of adjacent position pixel, the gray scale is recorded
The flag bit for jumping area is the first flag bit；
If the gray value of the current pixel location point is less than the gray value of adjacent position pixel, the gray scale is recorded
The flag bit for jumping area is the second flag bit.
Optionally, the index value of all Gray Level Jumps is recorded according to the flag bit in the Gray Level Jump area, comprising:
Whether the flag bit of the flag bit and lastrow that judge target line is consistent；
If the flag bit of the target line and the flag bit of lastrow are inconsistent, the line index of the target line is recorded,
And it is successively stored in line index matrix；
If the flag bit of the target line is consistent with the flag bit of lastrow, leaps to next line and continue to sentence
It is disconnected.
Optionally, the index value of all Gray Level Jumps is recorded according to the flag bit in the Gray Level Jump area, comprising:
Whether the flag bit of the flag bit and previous column that judge target column is consistent；
If the flag bit of the target column and the flag bit of previous column are inconsistent, the column index of the target column is recorded,
And it is stored in column index matrix with this；
If the flag bit of the target column is consistent with the flag bit of previous column, leaps to next column and continue to sentence
It is disconnected.
Optionally, the lateral side length and vertical edge length of the chessboard table images are calculated according to the index value, comprising:
The difference for calculating adjacent row index values in the line index matrix line by line obtains tessellated lateral side length matrix；
The difference for calculating adjacent column index value in the column index matrix by column obtains tessellated vertical edge length matrix.
Optionally, line-scan digital camera line frequency is obtained according to the tessellated lateral side length and vertical edge length computation and object is transported
The matching degree of dynamic speed, comprising:
The tessellated lateral side length matrix and the data in the tessellated vertical edge length matrix are successively substituted into
In formula (2), each tessellated matching error is calculated；
Wherein, length_h indicates that gridiron pattern lateral side length, length_v indicate gridiron pattern vertical edge length；
Using the mean value of all matching errors as the matching error of the line-scan digital camera line frequency and speed of moving body；
The matching degree of the line-scan digital camera line frequency and speed of moving body is judged according to the matching error.
Second aspect, the embodiment of the present application also provides whether a kind of line-scan digital camera line frequency and speed of moving body are matched
Simply judge system, comprising:
Setup module is fixed on testee for ajusting gridiron pattern target figure, be arranged the line frequency of line-scan digital camera with
The movement velocity of object；
Acquisition module, for acquiring the chessboard table images of the line-scan digital camera shooting；
Correction module, for carrying out slant correction to the chessboard table images；
Detection module records the Gray Level Jump area for detecting the Gray Level Jump area obtained in the chessboard table images
Flag bit；
Logging modle, for recording the index value of the Gray Level Jump according to the flag bit in the Gray Level Jump area；
First computing module, for the lateral side length and vertical edge of the chessboard table images to be calculated according to the index value
Length；
Second computing module, for the line-scan digital camera row according to the tessellated lateral side length and vertical edge length computation
The matching degree of frequency and speed of moving body.
Compared with prior art, the application has the beneficial effect that
Line-scan digital camera line frequency provided by the embodiments of the present application and the whether matched judgment method of speed of moving body include: by
Gridiron pattern target figure, which is ajusted, to be fixed on testee, and the line frequency of line-scan digital camera and the movement velocity of object is arranged, and acquires linear array
The chessboard table images of camera shooting carry out slant correction to chessboard table images, and detection obtains the Gray Level Jump in chessboard table images
Area records the flag bit in Gray Level Jump area, the index value of all Gray Level Jumps is recorded according to the flag bit in Gray Level Jump area, according to
The lateral side length and vertical edge length of chessboard table images is calculated in index value, according to tessellated lateral side length and vertical edge length gauge
Calculate the matching degree of line-scan digital camera line frequency and speed of moving body.The present invention is using shooting gridiron pattern target figure and to acquisition image
The method analyzed carrys out the matching degree of quantitative description line-scan digital camera line frequency and speed of moving body, because gridiron pattern is just
Rectangular, convenient for judging whether image deforms, in addition, gridiron pattern only has black-and-white two color, image contrast is very big, convenient for positioning
The length of tessellated horizontal edge and vertical edge is detected respectively, passes through the two by acquiring chessboard table images in tessellated line of demarcation
Length judges whether line-scan digital camera line frequency and speed of moving body match, not only easy to operate, but also can obtain objective and accurate sentencing
It is disconnected.
It should be understood that above general description and following detailed description be only it is exemplary and explanatory, not
The application can be limited.
Detailed description of the invention
In order to illustrate more clearly of the technical solution of the application, letter will be made to attached drawing needed in the embodiment below
Singly introduce, it should be apparent that, for those of ordinary skills, without creative efforts, also
Other drawings may be obtained according to these drawings without any creative labor.
Fig. 1 is a kind of line-scan digital camera line frequency provided by the embodiments of the present application and the whether matched judgement side of speed of moving body
The flow chart of method；
The schematic diagram of gridiron pattern target figure is illustrated in Fig. 2；
The schematic diagram of gridiron pattern horizontal edge and vertical edge is illustrated in Fig. 3；
Fig. 4 is that a kind of whether matched judgement of line-scan digital camera line frequency and speed of moving body provided by the embodiments of the present application is
The schematic diagram of system.
Specific embodiment
In order to make those skilled in the art better understand the technical solutions in the application, below in conjunction with the application reality
The attached drawing in example is applied, the technical scheme in the embodiment of the application is clearly and completely described, it is clear that described implementation
Example is only some embodiments of the present application, rather than whole embodiments.Based on the embodiment in the application, the common skill in this field
The application protection all should belong in art personnel every other embodiment obtained without making creative work
Range.
It is whether a kind of line-scan digital camera line frequency and speed of moving body provided by the embodiments of the present application are matched referring to Fig. 1
The flow chart of judgment method.
As shown in Figure 1, line-scan digital camera line frequency provided by the embodiments of the present application and the whether matched judgement of speed of moving body
Method includes:
S100: gridiron pattern target figure is ajusted and is fixed on testee, the line frequency of line-scan digital camera and the fortune of object are set
Dynamic speed.
Target uses chessboard trrellis diagram, gridiron pattern as shown in Fig. 2, because gridiron pattern be it is square, convenient for judging that image is
No to deform, in addition, gridiron pattern only has black-and-white two color, image contrast is very big, convenient for positioning tessellated line of demarcation.First will
The line frequency of line-scan digital camera and the movement velocity of object are set, then by gridiron pattern target figure ajust it is fixed on a moving belt or
On testee, line-scan digital camera is enabled to take the chessboard table images moved with testee.
S200: the chessboard table images of acquisition line-scan digital camera shooting.
After line-scan digital camera takes chessboard table images, a width gridiron pattern is acquired in the image in line-scan digital camera visual field center, or
Person's gridiron pattern is full of the image of line-scan digital camera visual field.
S300: slant correction is carried out to chessboard table images.
If shooting chessboard table images be it is inclined, for the ease of subsequent analysis, need to carry out slant correction to it.Inclination
There are many method of correction, and herein with no restrictions, this example is illustrated by taking Hough transform+projection correction method as an example.
Hough transform can detecte out the tilt angle of straight line in image, and the tilt angle of chessboard table images can be obtained.Assuming that chessboard
The tilt angle of table images is θ, and the coordinate of target point is (x in original image0,y0), x0And y0The target point is respectively indicated in institute
The line index in chessboard table images and column index are stated, after correction can be calculated by formula (1) according to projection correction's method
Coordinate of ground point (x, y), x and y respectively indicate the line index of target point and column index after slant correction.
S400: detection obtains the Gray Level Jump area in chessboard table images, records the flag bit in Gray Level Jump area.
Tessellated horizontal edge and vertical edge are available every respectively as shown in figure 3, the gridiron pattern full figure to acquisition detects
The lateral side length and vertical edge length of a grid.Specifically, when detecting lateral side length, the ash of the first row current pixel location point is obtained
Angle value calculates the absolute value of the difference of the gray value of the first row current pixel location point and the gray value of adjacent position pixel, sentences
Whether disconnected absolute value is greater than the threshold value (preferred given threshold as 50) set, if absolute value is greater than the threshold value of setting, then it is assumed that
The position is Gray Level Jump area, i.e., the line index of the position is recorded and stored, is stored in line index matrix by tessellated boundary
The first row.
Meet the position of condition for first, also needs the gray value for judging current pixel location point and adjacent position pixel
The size of the gray value of point is at this if the gray value of current pixel location point is greater than the gray value of adjacent position pixel
White arrives the boundary of black, and the flag bit of the row is recorded as the first flag bit (preferably the first flag bit is 1)；If current location
The gray value of pixel is less than the gray value of adjacent position pixel, then is black at this to the boundary of white, by the mark of the row
Will position is recorded as the second flag bit (preferably the second flag bit is 0).Above-mentioned processing, all gray scales of recording full are successively carried out line by line
Jump the flag bit in area.
S500: the index value of all Gray Level Jumps is recorded according to the flag bit in Gray Level Jump area.
After record obtains the flag bit in all Gray Level Jump areas of full figure, the flag bit of target line and the mark of lastrow are judged
Whether position is consistent, if the flag bit of target line and the flag bit of lastrow are inconsistent, records the line index of target line, and successively
It is stored in line index matrix；If the flag bit of target line is consistent with the flag bit of lastrow, next line continuation is leapt to
Judged.Each tessellated grid can account for the multiple lines and multiple rows of image, it is assumed that the 1st row of image to the 10th row belongs to
One white grid only enters next black lattice, flag bit just meeting then the flag bit of this 10 row is the same
It changes.That is, flag bit be used for distinguish grid intersection where.
S600: the lateral side length and vertical edge length of chessboard table images are calculated according to index value.
After having traversed all row data, complete line index matrix is obtained, has recorded all Gray Level Jumps in the matrix
Index value, to obtain the length of horizontal edge, it is also necessary to line by line calculate adjacent data difference, i.e., subtract same a line with current line index
Previous line index, finally obtain a whole completely tessellated lateral side length matrix.Assuming that complete gridiron pattern in figure
There are M row N column, then the size of lateral side length matrix is M × N.
When detecting vertical edge length, it is current to obtain first row as horizontal edge for the detection of gridiron pattern vertical edge and the method calculated
The gray value of position pixel, the gray value of the gray value and adjacent position pixel of calculating first row current pixel location point
Absolute value of the difference, judges whether absolute value is greater than the threshold value (preferred given threshold as 50) set, if absolute value is greater than setting
Threshold value, then it is assumed that the position be Gray Level Jump area, i.e., the column index of the position is recorded and stored, is deposited by tessellated boundary
Store up the first row in column index matrix.
Meet the position of condition for first, also needs the gray value for judging current pixel location point and adjacent position pixel
The size of the gray value of point is at this if the gray value of current pixel location point is greater than the gray value of adjacent position pixel
White arrives the boundary of black, and the flag bit of the column is recorded as the first flag bit (preferably the first flag bit is 1)；If current location
The gray value of pixel is less than the gray value of adjacent position pixel, then is black at this to the boundary of white, by the mark of the column
Will position is recorded as the second flag bit (preferably the second flag bit is 0).Above-mentioned processing, all gray scales of recording full are successively carried out by column
Jump the flag bit in area.
After record obtains the flag bit in all Gray Level Jump areas of full figure, the flag bit of target column and the mark of previous column are judged
Whether position is consistent, if the flag bit of target column and the flag bit of previous column are inconsistent, records the column index of target column, and successively
It is stored in column index matrix；If the flag bit of target column is consistent with the flag bit of previous column, next column continuation is leapt to
Judged.
After having traversed all column datas, complete column index matrix is obtained, has recorded all Gray Level Jumps in the matrix
Index value, to obtain the length of vertical edge, it is also necessary to by column calculate adjacent data difference, i.e., subtract same row with current column index
Previous column index, finally obtain a whole completely tessellated vertical edge length matrix, the size of vertical edge length matrix with
The size of lateral side length matrix is the same, is also M × N, and in two length matrixes same position data indicate be same
Tessellated lateral side length and vertical edge length.
S700: according to of tessellated lateral side length and vertical edge length computation line-scan digital camera line frequency and speed of moving body
With degree.
It is the build-in attribute of camera in view of the horizontal resolution of image is the resolution ratio of line-scan digital camera, and image
Vertical resolution is then related with the matching degree of line-scan digital camera line frequency and speed of moving body, is variable, therefore can pass through
The variation of gridiron pattern vertical edge opposed lateral edges is calculated to judge the matching degree of line-scan digital camera and speed of moving body.Definition matching misses
Poor α, calculation formula are shown in formula (2):
Wherein, length_h indicates that gridiron pattern lateral side length, length_v indicate gridiron pattern vertical edge length.If line-scan digital camera
Line frequency and the movement velocity of object strictly match, then matching error α is 0；If the line frequency of line-scan digital camera is higher than the movement of object
Speed, then matching error is negative, and numerical value is bigger, and image is stretched more serious；If the line frequency of line-scan digital camera is lower than object
Movement velocity, then matching error is integer, and numerical value is bigger, and image is compressed more serious.
The gridiron pattern lateral side length matrix that step S600 is calculated is with the data in vertical edge length matrix according to corresponding
Position successively substitutes into formula (2), and each tessellated matching error can be obtained, retouched with the mean value of all matching errors
The line frequency of current line-scan digital camera and the matching error of speed of moving body are stated, to judge the matching degree of the two.
Line-scan digital camera line frequency provided by the embodiments of the present application and the whether matched judgment method of speed of moving body are using bat
It takes the photograph target figure and the method analyzed acquisition image carrys out quantitative for describing line-scan digital camera line frequency and speed of moving body
With degree, target uses chessboard trrellis diagram, by acquiring chessboard table images, detects the length of tessellated lateral side length and vertical edge respectively
Degree judges whether the line frequency of line-scan digital camera matches with the movement velocity of object by calculating the side length of target in shooting image,
Not only easy to operate in this way, but also objective and accurate judgement can be obtained.
The line-scan digital camera line frequency and the whether matched judgment method of speed of moving body based on the above embodiment, this Shen
Please embodiment additionally provide a kind of line-scan digital camera line frequency and the whether matched judgement system of speed of moving body, as shown in figure 4, this
Application embodiment provide line-scan digital camera line frequency include: with the whether matched judgement system of speed of moving body
Setup module 100 is fixed on testee for ajusting gridiron pattern target figure, the line frequency of line-scan digital camera is arranged
With the movement velocity of object.
Acquisition module 200, for acquiring the chessboard table images of the line-scan digital camera shooting.
Correction module 300, for carrying out slant correction to the chessboard table images.
Detection module 400 records the Gray Level Jump for detecting the Gray Level Jump area obtained in the chessboard table images
The flag bit in area.
Logging modle 500, for recording the index value of the Gray Level Jump according to the flag bit in the Gray Level Jump area.
First computing module 600, for be calculated according to the index value lateral side lengths of the chessboard table images with
Vertical edge length.
Second computing module 700, for according to the tessellated lateral side length and linear array phase described in vertical edge length computation
The matching degree of machine line frequency and speed of moving body.
It should be noted that in the present specification, the relational terms of such as " first " and " second " or the like are used merely to
It distinguishes one entity or operation from another entity or operation, and not necessarily requires or imply these entities or operation
Between there are any this actual relationship or sequences.
Those skilled in the art will readily occur to its of the application after considering specification and practicing the disclosure invented here
His embodiment.This application is intended to cover any variations, uses, or adaptations of the invention, these modifications, purposes or
Person's adaptive change follows the general principle of the application and including the undocumented common knowledge in the art of the application
Or conventional techniques.The description and examples are only to be considered as illustrative, and the true scope and spirit of the application are wanted by right
The content asked is pointed out.
Above-described the application embodiment does not constitute the restriction to the application protection scope.
Claims (10)
1. a kind of line-scan digital camera line frequency and the whether matched judgment method of speed of moving body, which is characterized in that the method packet
It includes:
Gridiron pattern target figure is ajusted and is fixed on testee, the line frequency of line-scan digital camera and the movement velocity of object are set；
Acquire the chessboard table images of the line-scan digital camera shooting；
Slant correction is carried out to the chessboard table images；
Detection obtains the Gray Level Jump area in the chessboard table images, records the flag bit in the Gray Level Jump area；
The index value of all Gray Level Jumps is recorded according to the flag bit in the Gray Level Jump area；
The lateral side length and vertical edge length of the chessboard table images are calculated according to the index value；
According to of line-scan digital camera line frequency and speed of moving body described in the tessellated lateral side length and vertical edge length computation
With degree.
2. the method according to claim 1, wherein acquiring the chessboard table images of the line-scan digital camera shooting, packet
One width gridiron pattern of acquisition is included in the image in line-scan digital camera visual field center, or one width gridiron pattern of acquisition is full of line-scan digital camera visual field
Image.
3. the method according to claim 1, wherein carrying out slant correction to the chessboard table images, comprising:
Detection obtains the tilt angle theta of the chessboard table images；
Obtain the coordinate (x of target point in the chessboard table images0,y0), x0And y0The target point is respectively indicated in the chessboard
Line index and column index in table images；
The coordinate of ground point (x, y) after correction is calculated according to formula (1)；
Wherein, x and y respectively indicates the line index of target point and column index after slant correction.
4. the method according to claim 1, wherein detection obtains the Gray Level Jump in the chessboard table images
Area records the flag bit in the Gray Level Jump area, comprising:
Obtain the gray value of current pixel location point；
Calculate the absolute value of the difference of the gray value of the current pixel location point and the gray value of adjacent position pixel；
Judge whether the absolute value is greater than the threshold value of setting；
If the absolute value is greater than the threshold value of the setting, then it is assumed that current location is Gray Level Jump area；
According to the size of the gray value of the current pixel location point and the gray value of adjacent position pixel, the gray scale is recorded
Jump the flag bit in area.
5. according to the method described in claim 4, it is characterized in that, according to the gray value of the current pixel location point with it is adjacent
The size of the gray value of position pixel records the flag bit in the Gray Level Jump area, comprising:
Judge whether the gray value of the current pixel location point is greater than the gray value of adjacent position pixel；
If the gray value of the current pixel location point is greater than the gray value of adjacent position pixel, the Gray Level Jump is recorded
The flag bit in area is the first flag bit；
If the gray value of the current pixel location point is less than the gray value of adjacent position pixel, the Gray Level Jump is recorded
The flag bit in area is the second flag bit.
6. the method according to claim 1, wherein recording all ashes according to the flag bit in the Gray Level Jump area
Spend the index value of jump, comprising:
Whether the flag bit of the flag bit and lastrow that judge target line is consistent；
If the flag bit of the target line and the flag bit of lastrow are inconsistent, the line index of the target line is recorded, and according to
It is secondary to be stored in line index matrix；
If the flag bit of the target line is consistent with the flag bit of lastrow, leaps to next line and continue to judge.
7. the method according to claim 1, wherein recording all ashes according to the flag bit in the Gray Level Jump area
Spend the index value of jump, comprising:
Whether the flag bit of the flag bit and previous column that judge target column is consistent；
If the flag bit of the target column and the flag bit of previous column are inconsistent, the column index of the target column is recorded, and with
This is stored in column index matrix；
If the flag bit of the target column is consistent with the flag bit of previous column, leaps to next column and continue to judge.
8. according to method described in claim 6,7, which is characterized in that the chessboard trrellis diagram is calculated according to the index value
The lateral side length and vertical edge length of picture, comprising:
The difference for calculating adjacent row index values in the line index matrix line by line obtains tessellated lateral side length matrix；
The difference for calculating adjacent column index value in the column index matrix by column obtains tessellated vertical edge length matrix.
9. according to the method described in claim 8, it is characterized in that, according to the tessellated lateral side length and vertical edge length gauge
Calculation obtains the matching degree of line-scan digital camera line frequency and speed of moving body, comprising:
Data in the tessellated lateral side length matrix and the tessellated vertical edge length matrix are successively substituted into formula
(2) in, each tessellated matching error is calculated；
Wherein, length_h indicates that gridiron pattern lateral side length, length_v indicate gridiron pattern vertical edge length；
Using the mean value of all matching errors as the matching error of the line-scan digital camera line frequency and speed of moving body；
The matching degree of the line-scan digital camera line frequency and speed of moving body is judged according to the matching error.
10. a kind of line-scan digital camera line frequency and the whether matched judgement system of speed of moving body characterized by comprising
Setup module is fixed on testee for ajusting gridiron pattern target figure, the line frequency and object of line-scan digital camera is arranged
Movement velocity；
Acquisition module, for acquiring the chessboard table images of the line-scan digital camera shooting；
Correction module, for carrying out slant correction to the chessboard table images；
Detection module records the mark in the Gray Level Jump area for detecting the Gray Level Jump area obtained in the chessboard table images
Will position；
Logging modle, for recording the index value of the Gray Level Jump according to the flag bit in the Gray Level Jump area；
First computing module, the lateral side length and vertical edge for the chessboard table images to be calculated according to the index value are long
Degree；
Second computing module, for the line-scan digital camera line frequency according to the tessellated lateral side length and vertical edge length computation with
The matching degree of speed of moving body.
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