CN109523601A - A method of test paper color cast correction effect is improved using partial correction - Google Patents
A method of test paper color cast correction effect is improved using partial correction Download PDFInfo
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- CN109523601A CN109523601A CN201811357901.0A CN201811357901A CN109523601A CN 109523601 A CN109523601 A CN 109523601A CN 201811357901 A CN201811357901 A CN 201811357901A CN 109523601 A CN109523601 A CN 109523601A
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- 238000012360 testing method Methods 0.000 title claims abstract description 45
- 238000012937 correction Methods 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000000694 effects Effects 0.000 title claims abstract description 13
- 239000003153 chemical reaction reagent Substances 0.000 claims abstract description 24
- 238000013507 mapping Methods 0.000 claims abstract description 18
- 238000012545 processing Methods 0.000 claims abstract description 7
- 230000000007 visual effect Effects 0.000 claims abstract description 4
- 238000004364 calculation method Methods 0.000 claims description 6
- 238000001914 filtration Methods 0.000 abstract description 3
- 210000002700 urine Anatomy 0.000 description 4
- 238000005286 illumination Methods 0.000 description 3
- 238000007323 disproportionation reaction Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000012552 review Methods 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/90—Determination of colour characteristics
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T5/00—Image enhancement or restoration
- G06T5/77—Retouching; Inpainting; Scratch removal
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/10—Segmentation; Edge detection
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/10—Image acquisition modality
- G06T2207/10024—Color image
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/20—Special algorithmic details
- G06T2207/20021—Dividing image into blocks, subimages or windows
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Abstract
The invention discloses a kind of methods for improving test paper color cast correction effect using partial correction, it is comprised the following steps: one, acquiring test strips image by camera；Two, image is carried out by cutting by visual pattern processing module；Three, the white space that removal test strips periphery may be affected, the small figure after cutting to image region to be checked carry out gaussian filtering process and mark；Four, the average colour cast mapping ratio and value of chromatism of white three color lumps in periphery are calculated；Five, using white blocks be averaged colour cast mapping ratio and value of chromatism reduction calculate reagent block color value；Six, the reagent block color value after correcting is matched with the comparison of default color value, obtains testing result；Calibration result is more accurate, closer to legitimate reading.
Description
Technical field
The present invention relates to test paper color cast correction technical fields, and in particular to a kind of to improve test paper colour cast school using partial correction
The method of plus effect.
Background technique
Urine examination is carried out compared to going to hospital to do urine examination using test paper, is reduced check cost, is saved the review time, is in i.e.
It can operate, it is convenient, time saving, laborsaving, economical.The main method of urine examination at present is the examination on test paper after dripping leaching urine by test paper
Agent block, which reacts, causes color change, and corresponding symptom is judged by the color after variation.According to pass through camera, mobile phone pair
Test paper take pictures the method for comparison, precise calibration cannot be carried out to colour cast problem, so that color detection result inaccuracy；If adopting
Global shooting is carried out with to test paper, the method for color cast correction is carried out by single standard color block, can not rule out due to brightness disproportionation
The factors such as even cause the problem of color cast correction inaccuracy.；To sum up, reagent can just be made by only carrying out effective color cast correction to image
Block has reference value, just can guarantee the accuracy of testing result, it is therefore necessary to which color cast correction can be effectively improved by finding one kind
The method of effect.
The method of traditional color cast correction is: within the scope of full figure, carrying out color cast correction for standard color block, then by colour cast
Coefficient is applied to other reagent blocks of full figure；The shortcomings that full figure corrects is cannot to cope with the fact that uneven illumination is even well；When
When illumination brightness disproportionation, the colour cast phenomenon of each regional area is inconsistent, therefore uses unified colour cast coefficient, can be made
The accuracy of full figure correction reduces, and influences testing result.
Summary of the invention
In view of the defects and deficiencies of the prior art, the present invention intends to provide a kind of simple structure and reasonable design, make
With the convenient method for improving test paper color cast correction effect using partial correction, calibration result is accurate, closer to legitimate reading.
To achieve the above object, the technical solution adopted by the present invention is that: it is comprised the following steps:
One, test strips image is acquired by camera；
Two, image is carried out by cutting by visual pattern processing module；
Three, the white space that removal test strips periphery may be affected, the small figure after cutting to image region to be checked carry out high
This filtering processing and mark；
Four, the average colour cast mapping ratio and value of chromatism of white three color lumps in periphery are calculated；
Five, using white blocks be averaged colour cast mapping ratio and value of chromatism reduction calculate reagent block color value；
Six, the reagent block color value after correcting is matched with the comparison of default color value, obtains testing result.
Further, the test strips are equipped with to be checked piece, reagent block, reference block；Reference block is located to be checked piece of week
It encloses；Reagent block is located on to be checked piece of diagonal line；
Further, in step 2 image cutting rule are as follows: setting fixed range to test strips image carry out gridding
Cutting；
Further, the average colour cast mapping ratio of three color lumps is calculated in step 4 and value of chromatism comprises the following steps:
A, it chooses and needs white three color lumps in the periphery of the color lump A of color cast correction, respectively color lump B, color lump C, color lump D；
B, 5 points are chosen in color lump B and are used as sample point, selection rule for point at color lump cornerwise 1/4 and two it is right
The intersection point of linea angulata；
C, the RGB color value of 5 points is calculated into average, that is, is defined as the representative RGB color value of color lump B；
D, it similarly calculates the representative RGB color value of color lump C and color lump D, then calculates color lump B, color lump C, color lump D and be averaged
RGB color value
E, in average RGB color valueThe maximum channel of middle selection numerical value, defining the value is
Maxval；IfFor largest passages value Maxval, by setting parameter beta,Make the number ratios (1:1:1) in three channels,
I.e.Be calculated β,Parameter value, then the RGB color value of white base stock is reflected
Penetrate ratio be (1: β:)；IfOrLargest passages value Maxval, calculation method withWhen for largest passages value Maxval
It is identical；
F, since the RGB standard value of white is (255.255.255), value of chromatism Δ f=Maxval-255 can be calculated；By
In color lump B, color lump C, color lump D, the symbolic animal of the birth year neighbouring region in test strips color lump A, these three whites of color lump B, color lump C, color lump D can be used
Color lump mapping ratio (1: β:) and value of chromatism Δ f be applied to color lump A color cast correction；
Further, in step 5, using white blocks be averaged colour cast mapping ratio and value of chromatism reduction calculate reagent block color
Value comprises the following steps:
A, 5 sample points are chosen in color lump A and calculate RGB average value
B, value is (Ra, Ga, Ba) after defining the triple channel RGB color value correction of color lump A, then calculation formula is as follows:
After adopting the above scheme, a kind of side for improving test paper color cast correction effect using partial correction of the present invention
Method has the advantage that
1, it around each reagent block, arranges multiple with reference to color lump；By the reference color lump first to reagent block periphery into
The calculating of row mapping coefficient reapplies on the color cast correction of reagent block, keeps mapping coefficient more acurrate；
2, each reagent block only needs to use the reference color lump of subrange, even if global illumination is uneven, also without interruption；
3, the calibration result of each reagent block is more accurate, closer to legitimate reading.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention without any creative labor, may be used also for those of ordinary skill in the art
To obtain other drawings based on these drawings.
Fig. 1 is the structural schematic diagram of test strips of the present invention.
Specific embodiment
With reference to the accompanying drawing, the present invention is further illustrated.
Embodiment: referring to shown in Fig. 1, white space 1 is equipped with around the test strips；Test strips are equipped with to be checked
Block, reagent block, reference block；Reference block is located at around to be checked piece；Reagent block is located on to be checked piece of diagonal line；Color lump a, color lump
C, color lump g, color lump i, color lump m, color lump o, color lump s, color lump u are reagent block；Color lump b, color lump d, color lump f, color lump h, color lump
J, color lump l, color lump n, color lump p, color lump r, color lump t, color lump v, color lump x are reference block；Color lump e, color lump k, color lump q, color lump w
It is to be checked piece；
A method of test paper color cast correction effect being improved using partial correction, it is comprised the following steps:
One, test strips image is acquired by camera；
Two, image is carried out by cutting by visual pattern processing module；Since the size of test strips is known fixed, bottom
The positions and dimensions of slot test paper rest area are also known fixed, can carry out grid to test strips image by setting fixed range
Change cutting；
Three, the white space 1 that removal test strips periphery may be affected, the small figure after cutting to image region to be checked carry out high
This filtering processing and mark；
Four, the average colour cast mapping ratio and value of chromatism of white three color lumps in periphery are calculated:
1, tri- color lump b, color lump d, color lump e color lumps are taken respectively；
2,5 points are chosen in color lump b and are used as sample point, selection rule for point at color lump cornerwise 1/4 and two it is right
The intersection point of linea angulata；
3, the RGB color value of 5 points is calculated into average, that is, is defined as the representative RGB color value of b color lump；
4, it similarly calculates the representative RGB color value of color lump d and color lump e, then calculates color lump b, color lump d, color lump e and be averaged
RGB color value
5, in average RGB color valueThe maximum channel of middle selection numerical value, defining the value is
Maxval；If R1 be largest passages value Maxval, by setting parameter beta,Make the number ratios (1:1:1) in three channels,
I.e.Be calculated β,Parameter value, then the RGB color value of white base stock is reflected
Penetrate ratio be (1: β:)；IfOrWhen largest passages value Maxval, calculation method withFor largest passages value Maxval
Shi Xiangtong；
6, since the RGB standard value of white is (255.255.255), value of chromatism Δ f=Maxval-255 can be calculated；By
In color lump a, color lump b, color lump d, the symbolic animal of the birth year neighbouring region in test strips color lump e, the mapping ratio of b, d, e tri- white color lumps can be used
(1: β:) and value of chromatism Δ f be applied to color lump a color cast correction；
Five, using white blocks be averaged colour cast mapping ratio and value of chromatism reduction calculate reagent block color value:
1,5 sample points are chosen in color lump a and calculate RGB average value
2, value is (Ra, Ga, Ba) after defining the triple channel RGB color value correction of color lump a, then calculation formula is as follows:
3, the color of color lump c, color lump g, color lump i, color lump m, color lump o, color lump s, color lump u be may also correct for according to above step
Inclined RGB color value；
Six, the reagent block color value after correcting is matched with the comparison of default color value, obtains testing result.
The above is merely illustrative of the technical solution of the present invention, rather than limits those of ordinary skill in the art to this hair
The other modifications or equivalent replacement that bright technical solution is made, as long as it does not depart from the spirit and scope of the technical scheme of the present invention,
It is intended to be within the scope of the claims of the invention.
Claims (5)
1. a kind of method for improving test paper color cast correction effect using partial correction, it is characterised in that it is comprised the following steps:
One, test strips image is acquired by camera；
Two, image is carried out by cutting by visual pattern processing module；
Three, the white space that removal test strips periphery may be affected, the small figure after cutting to image region to be checked carry out Gauss filter
Wave processing and mark；
Four, the average colour cast mapping ratio and value of chromatism of white three color lumps in periphery are calculated；
Five, using white blocks be averaged colour cast mapping ratio and value of chromatism reduction calculate reagent block color value；
Six, the reagent block color value after correcting is matched with the comparison of default color value, obtains testing result.
2. a kind of method for improving test paper color cast correction effect using partial correction according to claim 1, feature exist
To be checked piece, reagent block, reference block are equipped in the test strips；Reference block is located at around to be checked piece；Reagent block be located to
On the diagonal line for examining block.
3. a kind of method for improving test paper color cast correction effect using partial correction according to claim 1 or 2, feature
It is the rule of image cutting in step 2 are as follows: setting fixed range carries out gridding cutting to test strips image.
4. a kind of method for improving test paper color cast correction effect using partial correction according to claim 1, feature exist
The average colour cast mapping ratio of three color lumps is calculated in step 4 and value of chromatism comprises the following steps:
A, it chooses and needs white three color lumps in the periphery of the color lump A of color cast correction, respectively color lump B, color lump C, color lump D；
B, 5 points are chosen in color lump B as sample point, selection rule is point and two diagonal lines at color lump cornerwise 1/4
Intersection point；
C, the RGB color value of 5 points is calculated into average, that is, is defined as the representative RGB color value of color lump B；
D, the representative RGB color value of color lump C and color lump D is similarly calculated, the average RGB of color lump B, color lump C, color lump D are then calculated
Color value
E, in average RGB color valueThe maximum channel of middle selection numerical value, defining the value is Maxval；IfFor largest passages value Maxval, by setting parameter beta,Make the number ratios (1:1:1) in three channels, i.e.,Be calculated β,Parameter value, then the mapping of the RGB color value of white base stock
Ratio isIfOrLargest passages value Maxval, calculation method withFor largest passages value Maxval
Shi Xiangtong；
F, since the RGB standard value of white is (255.255.255), value of chromatism Δ f=Maxval-255 can be calculated；Due to color
Block B, color lump C, color lump D, the symbolic animal of the birth year neighbouring region in test strips color lump A can use these three white color lumps of color lump B, color lump C, color lump D
Mapping ratioIt is applied to the color cast correction of color lump A with value of chromatism Δ f.
5. a kind of method for improving test paper color cast correction effect using partial correction according to claim 1 or 4, feature
Be in step 5, be averaged colour cast mapping ratio using white blocks and value of chromatism reduction to calculate reagent block color value include following step
It is rapid:
A, 5 sample points are chosen in color lump A and calculate RGB average value
B, value is (Ra, Ga, Ba) after defining the triple channel RGB color value correction of color lump A, then calculation formula is as follows:
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102196274A (en) * | 2011-05-10 | 2011-09-21 | 西安理工大学 | Automatic white balance method based on color mapping |
| CN105223196A (en) * | 2015-10-16 | 2016-01-06 | 长春孚宗科技股份有限公司 | A kind of urinalysis method based on intelligent terminal |
| CN105388147A (en) * | 2015-10-21 | 2016-03-09 | 深圳市宝凯仑生物科技有限公司 | Detection method for body fluid based on special test paper |
| CN105812762A (en) * | 2016-03-23 | 2016-07-27 | 武汉鸿瑞达信息技术有限公司 | Automatic white balance method for processing image color cast |
| CN106546581A (en) * | 2016-11-02 | 2017-03-29 | 长沙云知检信息科技有限公司 | Detection paper card intelligent checking system and detection paper card intelligent analysis method |
| DE202017106020U1 (en) * | 2017-10-04 | 2018-01-01 | Hangzhou Alltest Biotech Co., Ltd. | A test device for liquid |
-
2018
- 2018-11-15 CN CN201811357901.0A patent/CN109523601A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102196274A (en) * | 2011-05-10 | 2011-09-21 | 西安理工大学 | Automatic white balance method based on color mapping |
| CN105223196A (en) * | 2015-10-16 | 2016-01-06 | 长春孚宗科技股份有限公司 | A kind of urinalysis method based on intelligent terminal |
| CN105388147A (en) * | 2015-10-21 | 2016-03-09 | 深圳市宝凯仑生物科技有限公司 | Detection method for body fluid based on special test paper |
| CN105812762A (en) * | 2016-03-23 | 2016-07-27 | 武汉鸿瑞达信息技术有限公司 | Automatic white balance method for processing image color cast |
| CN106546581A (en) * | 2016-11-02 | 2017-03-29 | 长沙云知检信息科技有限公司 | Detection paper card intelligent checking system and detection paper card intelligent analysis method |
| DE202017106020U1 (en) * | 2017-10-04 | 2018-01-01 | Hangzhou Alltest Biotech Co., Ltd. | A test device for liquid |
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