CN110418128A - Measurement and analysis method based on imaging colorimeter measurement three-dimensional color space display - Google Patents
Measurement and analysis method based on imaging colorimeter measurement three-dimensional color space display Download PDFInfo
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Abstract
Measurement and analysis method based on imaging colorimeter measurement three-dimensional color space display, by the way that colorimeter is imaged, the whole measurement of the display result of the image in subjective testing in the display is got off, is then statisticallyd analyze, it obtains in actual displayed scene, the quantifiable optical property of display.As a result be easy to correspond to the subjective experience of user, be also easy to the application scenarios once and compare, it is as a result with uniformity it is high, repeatability is high, accuracy is high, it is intuitive, can quantify, easy lateral comparison the advantages that.
Description
Technical field
The present invention relates to image analysis technology fields.
Background technique
The optical measurement of display, there is a methods and apparatus of many professions, and measurement includes coloration, luminance viewing angle, when response
Between etc. various aspects, but all contents covered of these objective examinations often can not intuitively reflect human eye for show image
User experience.User can say that so-and-so screen is not beautiful enough, so-and-so screen, which is compared always to compare, obscures dim, so-and-so screen colour cast etc., this
A little evaluations are subjective feelings, and the method and result with objective examination mentioned above can not be corresponded to directly, such as beautiful possibility
Just cover all various factors such as brightness, contrast, clarity, color saturation.
The objective examination of traditional monitor generally requires to show specific image, such as pure color, grayscale etc., uses coloration
Meter measures single display optical property, such as the colour gamut range of display, brightness, gamma etc., and it is objective that this measurement has
Property, but when actual use, user will not encounter such display scene.
And in subjective testing, then it is the various images of display or video, judges that superiority and inferiority, weakness are can not to quantify by human eye,
And each one hobby is different, is also not easy to correspond to each performance in objective examination.
Summary of the invention
In order to solve the above problem existing for traditional monitor test method, the present invention provides one kind based on imaging coloration
The measurement and analysis method of meter measurement three-dimensional color space display.
Present invention technical solution used for the above purpose is: aobvious based on imaging colorimeter measurement three-dimensional color space
Show the measurement and analysis method of device, comprising the following steps:
Display or standard indicator are compared to target with display to be measured 1. selecting；
2. selecting picture according to the demand of test；
3. testing same picture, human eye subjective judgement superiority and inferiority using display to be measured and comparison display display, and remember
Human eye impression is recorded, the display for more meeting human eye opinion score is picked out；
4. shoot the image that each display show using imaging colorimeter, obtain the coloration of the result whole picture figure of display with
Lightness dimension；
5. according to display meet colour space standard, calculate original picture the ideal colour space it is substandard display as a result,
Coloration and lightness dimension including each pixel；
6. providing the coloration and brightness of coloration and brightness and original image that imaging colorimeter obtains, just under the same coordinate system
Under normal state, its chrominance space of the better display of quality and the distribution consistency of original image chrominance space are higher；
7. exporting statistic analysis result.
It is further comprising the steps of:
8., if objective results are consistent with subjective results, being recognized in conjunction with actual objective results based on subjective perception result
With subjective opinion be under conditions of the test chart for objective results it is identical, if inconsistent, screening and subjective consistent item,
If there is no consistent item, then it is assumed that objective parameter can not cover subjective opinion, increase evaluation and test item by linking up with observer,
It is consistent if there is at least one as a result, then can choose out the content that people focuses more under the width test chart；
9. repeating step 2~8 by increasing comparison display or adjustment display, until all test images
It is completed.
In the step 6, consistency can be analyzed by following statistic:
6-1. brightness histogram counts the pixel distribution that each display data is captured with original image under brightness and colorimeter,
If display captures data and with the distribution results of original image differ bigger, represents display and be distorted higher, quality is poorer；
6-2. chroma histogram counts the pixel distribution that each display data is captured with original image under coloration and colorimeter,
If display captures data and with the distribution results of original image differ bigger, represents display and be distorted higher, quality is poorer；
6-3. colour gamut saturation degree compares, and under identical colour gamut, calculates original image and colorimeter captures each display data
Color Range, display color range and the intersection of original image range are bigger, it is believed that the distortion of display is smaller, and quality is higher；
6-4. colour space three-dimensional compares, under conditions of given original image, according to original image color space distribution, with color
It adjusts, the angle of saturation degree and brightness provides it in the distribution sample of three-dimensional space, similarly, the case where colorimeter provides data
Under, the distribution of each comfortable three-dimensional space is provided, since the presentation mode of three-dimensional space is closed polyhedron, each polyhedron exists
The model used when comparing will have a direct impact on the superiority and inferiority of final comparison result, and model is more complicated, and precision is higher, and comparison model is such as
Under:
6-4.1. calculates all threedimensional models in the minimax range of certain plane, takes the range comprising all threedimensional models
As benchmark section；
6-4.2. equably generates sample coordinate in each section direction of range, then according to practical three-dimensional coordinate and sampling
All models are calculated in the value of uniform sampling coordinate corresponding position in coordinate by the way of interpolation；
Three-dimensional data to be compared is converted to two dimensional image by 6-4.3., and the row, column coordinate of image is sample coordinate, is inserted
Value result is defined as gray value, then does numerical value normalizing to the two dimensional image gray scale of each generation；
6-4.4. calculates each colorimeter and obtains image and the similarity with reference to figure, and using SSIM algorithm, similarity is bigger,
Display reduction degree is higher, and quality is better.
Measurement and analysis method based on imaging colorimeter measurement three-dimensional color space display of the invention, by the way that color is imaged
Degree meter, the whole measurement of the display result of the image in subjective testing in the display is got off, then statisticallys analyze, obtains
In actual displayed scene, the quantifiable optical property of display.This result is easy to correspond to the subjective experience of user,
Be easy to the application scenarios once to compare, it is as a result with uniformity it is high, repeatability is high, accuracy is high, it is intuitive, can quantify,
The advantages that easy lateral comparison.
Detailed description of the invention
Fig. 1 is that the present invention is based on the measurement of imaging colorimeter measurement three-dimensional color space display and analysis method flow charts.
Specific embodiment
The display that picture to be measured is shown using imaging colorimeter shooting, is analyzed, histogram analysis, colour gamut using the colour space
Statistical methods, the calculated results by result with original image in numeric field such as analysis compare, and can investigate the reduction or increasing of display
Strong ability.The display difference that two displays can also be compared, evaluates the superiority and inferiority of display.
Imaging colorimeter is often used for the homogeneity measurement or the measurement of Mura of screen, can be used for here for whole picture
The colour space of image takes statistics measurement, and benefit is:
A) display once can be shown that all the elements of picture are taken completely.
B) the use high-precision CCD that colorimeter is imaged is imaged, and each pixel passes through brightness calibration, measured result
It is relatively accurate.
C) imaging colorimeter can obtain the XYZ chromaticity coordinates of the accurate CIE-1931 of each pixel by calibration.
D) calibrating as a result, can be with lateral comparison for the result of different display measurements.
E) consistent with the principle of eyes imaging system using camera system, therefore, human eye viewing display can be simulated
User experience.
F) since brightness and chromaticity coordinates can obtain, the different displays of acquisition that can be quantified are in display is same
Difference when appearance, and it is associated with impression of the human eye for different displays.These give the objective amounts of display field subjective feeling
Change method.
G) objectively result is easier to be associated with the individual event of actual display or multinomial optical property, it is easier to help manufacturer
The shortcomings that obtaining display and weakness, and make and being correspondingly improved.This method verifying can be used in same improved performance.
Measurement and analysis method of the invention based on imaging colorimeter measurement three-dimensional color space display of the invention, such as
Shown in Fig. 1, comprising the following steps:
Display or standard indicator are compared to target with display to be measured 1. selecting；
2. select picture appropriate, such as the emphasis tested that can be divided into according to the demand of test, luminance contrast, color
Saturation degree, colored, grayscale, HDR etc.；
3. testing same picture, human eye subjective judgement superiority and inferiority using to be measured and comparison display display, and record human eye
Impression, picks out the display for more meeting human eye opinion score；
4. shooting the image that each display is shown using imaging colorimeter (equipment PM I16 can be used), shown
Result whole picture figure coloration and lightness dimension；
5. according to the colour space standard that display meets, such as sRGB, DCI-P3 etc. calculate original picture in ideal colour space mark
Display under quasi- is as a result, include the coloration and lightness dimension of each pixel.The ideal substandard display of the colour space is the result is that public
The color space conversion model known, RGB to sRGB, CIELab etc.；
6. providing the coloration and brightness of coloration and brightness and original image that imaging colorimeter obtains, just under the same coordinate system
Under normal state, its chrominance space of the better display of quality and the distribution consistency of original image chrominance space are higher, here consistent
Property can be analyzed by following statistic:
6-1. brightness histogram counts the pixel distribution that each display data is captured with original image under brightness and colorimeter,
If display captures data and with the distribution results of original image differ bigger, represents display and be distorted higher, quality is poorer；
6-2. chroma histogram counts the pixel distribution that each display data is captured with original image under coloration and colorimeter,
If display captures data and with the distribution results of original image differ bigger, represents display and be distorted higher, quality is poorer；
6-3. colour gamut saturation degree compares, and under identical colour gamut, calculates original image and colorimeter captures each display data
Color Range, display color range and the intersection of original image range are bigger, it is believed that the distortion of display is smaller, and quality is higher；This
In Color Range be according to mentioning corresponding coordinate range after each color gamut space transformation model converts data in step
It provides, such as the space xyz, it be 5~20, z is 3~15 that x coordinate range, which is 1~10, y, then in corresponding space coordinates
It is interior, form a range distribution；
6-4. colour space three-dimensional compares,, can be with according to original image in the distribution of color space under conditions of given original image
Tone, saturation degree and the angle of brightness provide it in the distribution sample of three-dimensional space, similarly, provide the feelings of data in colorimeter
Under condition, the distribution of each comfortable three-dimensional space can be provided, since the presentation mode of three-dimensional space is closed polyhedron, Ge Geduo
The model that face body uses when relatively will have a direct impact on the superiority and inferiority of final comparison result, and model is more complicated, and precision is higher, give here
A simple comparison model out:
6-4.1. calculates all threedimensional models in the minimax range of certain plane, takes the range comprising all threedimensional models
As benchmark section；The data that acquisition obtains are usually rgb color space or other standards space, are converted through color gamut space,
Coordinate range is counted after converting；
6-4.2. equably generates sample coordinate in each section direction of range, then according to practical three-dimensional coordinate and sampling
All models are calculated in the value of uniform sampling coordinate corresponding position in coordinate by the way of interpolation；
6-4.3. is converted to two dimensional image here, by three-dimensional data to be compared, and the row, column coordinate of image is that sampling is sat
Mark, interpolation result are defined as gray value, then do numerical value normalizing to the two dimensional image gray scale of each generation；Two dimensional image is also
Three-dimensional data, three data coding methods are (x, y, z), and image is z (x, y), by two color gamut value reasons of certain in three-dimensional data
Solution is space coordinate, another is interpreted as the function of space coordinate.Numerical value normalizing representative mean z (x, y)=z (x, y)/
Max (abs (z (x, y))), i.e., to the whole numerical value of certain colour gamut divided by maximum absolute value value, the value of this colour gamut in this way is up to
1, minimum -1.
6-4.4. calculates each colorimeter and obtains image and the similarity with reference to figure, can use SSIM algorithm, similarity
It is bigger, it is believed that display reduction degree is higher, and quality is better.
7. objective parameter comparison result is embodied in the form reported, available each display is in different ginsengs
Superiority and inferiority comparison result under amount；
8., if objective results are consistent with subjective results, being recognized in conjunction with actual objective results based on subjective perception result
With subjective opinion be under conditions of the test chart for objective results it is identical, if inconsistent, screening and subjective consistent item,
If there is no consistent item, then it is assumed that objective parameter can not cover subjective opinion, increase evaluation and test item by linking up with observer,
It is consistent if there is at least one as a result, then can choose out the content that people focuses more under the width test chart；
9. repeating 2~8 by increasing comparison display or adjustment display, until all test images are tested
It finishes.
The present invention, can be by the image in subjective testing in the display display result whole by imaging colorimeter
Measurement is got off, and is then statisticallyd analyze, and is obtained in actual displayed scene, the quantifiable optical property of display.This result
It is easy to correspond to the subjective experience of user, is also easy to the application scenarios once and compares: a) display and original image, b) it is different
Display shows same sampled images, c) the various enhancing functions front and backs of monitor switch.Method of the invention can neatly test aobvious
Show the imaging difference before and after device shows the various enhancing functions of same sampled images, monitor switch from original image, different displays, makes result
It is more intuitive, it is easy to do lateral comparison；Objective examination's parameter and subjective testing process are connected, can be given for different figures
Different subjective emphasis out optimizes objective examination's process with this, improves the relevance of index and image, increase objective examination
As a result robustness；It can do display equipment in conjunction with subjective observation emphasis by the test result of different figures and adjust targeted specifically
Excellent (the especially display equipment of special occasions).As a result with uniformity it is high, repeatability is high, accuracy is high, it is intuitive, can measure
The advantages that change, easy lateral comparison.
The present invention is described by embodiment, and those skilled in the art know, is not departing from spirit of the invention
In the case where range, various changes or equivalence replacement can be carried out to these features and embodiment.In addition, in religion of the invention
It leads down, can modify to these features and embodiment to adapt to particular situation and material without departing from essence of the invention
Mind and range.Therefore, the present invention is not limited to the particular embodiment disclosed, fallen with claims hereof
Embodiment in range belongs to protection scope of the present invention.
Claims (3)
1. measurement and analysis method based on imaging colorimeter measurement three-dimensional color space display, it is characterised in that: including following
Step:
(1), which is selected, compares display or standard indicator to target with display to be measured；
(2) selects picture according to the demand of test；
(3) tests same picture, human eye subjective judgement superiority and inferiority using display to be measured and comparison display display, and records
Human eye impression, picks out the display for more meeting human eye opinion score；
(4) shoots the image that each display shows using imaging colorimeter, obtains the coloration of the result whole picture figure of display and bright
Spend coordinate；
(5) colour space standard that meets according to display calculates original picture in the substandard display of the ideal colour space as a result, packet
Include the coloration and lightness dimension of each pixel；
(6) provides the coloration and brightness of coloration and brightness and original image that imaging colorimeter obtains, normally under the same coordinate system
Under state, its chrominance space of the better display of quality and the distribution consistency of original image chrominance space are higher；
(7) exports statistic analysis result.
2. the measurement and analysis method according to claim 1 based on imaging colorimeter measurement three-dimensional color space display,
It is characterized by also including following steps:
8. based on subjective perception result in conjunction with actual objective results, if objective results are consistent with subjective results, it is believed that visitor
See result and subjective opinion be under conditions of the test chart it is identical, if inconsistent, screening and the consistent item of subjectivity, if
There is no consistent items, then it is assumed that and objective parameter can not cover subjective opinion, increase evaluation and test item by linking up with observer, if
It is consistent there are at least one as a result, then can choose out the content that people focuses more under the width test chart；
9. repeating step 2~8 by increasing comparison display or adjustment display, until all test images are tested
It finishes.
3. the measurement and analysis method according to claim 1 based on imaging colorimeter measurement three-dimensional color space display,
It is characterized by: consistency can be analyzed by following statistic in the step (6):
(6-1) brightness histogram counts the pixel distribution that each display data is captured with original image under brightness and colorimeter, if
Display captures data and with the distribution results of original image differ bigger, represents display and is distorted higher, quality is poorer；
(6-2) chroma histogram counts the pixel distribution that each display data is captured with original image under coloration and colorimeter, if
Display captures data and with the distribution results of original image differ bigger, represents display and is distorted higher, quality is poorer；
(6-3) colour gamut saturation degree compares, and under identical colour gamut, calculates original image and colorimeter captures the color of each display data
Color range, display color range and the intersection of original image range are bigger, it is believed that the distortion of display is smaller, and quality is higher；
(6-4) colour space three-dimensional compares, under conditions of given original image, according to original image color space distribution, with tone,
Saturation degree and the angle of brightness provide it in the distribution sample of three-dimensional space, similarly, in the case where colorimeter provides data,
The distribution for providing each comfortable three-dimensional space, since the presentation mode of three-dimensional space is closed polyhedron, each polyhedron than
Compared with when the model that uses will have a direct impact on the superiority and inferiority of final comparison result, model is more complicated, and precision is higher, and comparison model is as follows:
(6-4.1) calculates all threedimensional models in the minimax range of certain plane, and the range comprising all threedimensional models is taken to make
For benchmark section；
(6-4.2) equably generates sample coordinate in each section direction of range, is then sat according to practical three-dimensional coordinate and sampling
Mark, is calculated all models in the value of uniform sampling coordinate corresponding position by the way of interpolation；
Three-dimensional data to be compared is converted to two dimensional image by (6-4.3), and the row, column coordinate of image is sample coordinate, interpolation
As a result it is defined as gray value, numerical value normalizing then is done to the two dimensional image gray scale of each generation；
(6-4.4) calculates each colorimeter and obtains image and the similarity with reference to figure, and using SSIM algorithm, similarity is bigger, shows
Show that device reduction degree is higher, quality is better.
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Application publication date: 20191105 |