WO1991011075A1 - Procede et dispositif de correction automatique de geometrie, de superposition de couleurs et d'uniformite d'image pour camera de television - Google Patents
Procede et dispositif de correction automatique de geometrie, de superposition de couleurs et d'uniformite d'image pour camera de television Download PDFInfo
- Publication number
- WO1991011075A1 WO1991011075A1 PCT/FR1991/000022 FR9100022W WO9111075A1 WO 1991011075 A1 WO1991011075 A1 WO 1991011075A1 FR 9100022 W FR9100022 W FR 9100022W WO 9111075 A1 WO9111075 A1 WO 9111075A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- patterns
- camera
- pattern
- correction
- image
- Prior art date
Links
- 238000012937 correction Methods 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000003086 colorant Substances 0.000 title claims description 3
- 230000008569 process Effects 0.000 title abstract description 3
- 238000012360 testing method Methods 0.000 claims abstract description 24
- 230000003287 optical effect Effects 0.000 claims abstract description 18
- 238000005259 measurement Methods 0.000 claims description 51
- 238000004364 calculation method Methods 0.000 claims description 14
- 230000006870 function Effects 0.000 claims description 9
- 230000000295 complement effect Effects 0.000 claims description 3
- 239000011159 matrix material Substances 0.000 claims description 3
- 230000001960 triggered effect Effects 0.000 claims description 3
- 238000009432 framing Methods 0.000 claims description 2
- 230000008520 organization Effects 0.000 claims description 2
- 241001080526 Vertica Species 0.000 claims 1
- 238000011156 evaluation Methods 0.000 abstract description 2
- 241000519995 Stachys sylvatica Species 0.000 description 5
- 239000013256 coordination polymer Substances 0.000 description 5
- 230000008901 benefit Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000009499 grossing Methods 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 201000009310 astigmatism Diseases 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 101100459896 Caenorhabditis elegans ncl-1 gene Proteins 0.000 description 1
- 206010027146 Melanoderma Diseases 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000012888 cubic function Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 238000013213 extrapolation Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000012886 linear function Methods 0.000 description 1
- DTPSXFMGMQOVTG-ISJGIBHGSA-N n-[(2r)-4-[3-[(1s,2r)-2-aminocyclopropyl]phenoxy]-1-(benzylamino)-1-oxobutan-2-yl]benzamide Chemical compound N[C@@H]1C[C@H]1C1=CC=CC(OCC[C@@H](NC(=O)C=2C=CC=CC=2)C(=O)NCC=2C=CC=CC=2)=C1 DTPSXFMGMQOVTG-ISJGIBHGSA-N 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
- H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
- H04N3/16—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
- H04N3/22—Circuits for controlling dimensions, shape or centering of picture on screen
- H04N3/23—Distortion correction, e.g. for pincushion distortion correction, S-correction
- H04N3/233—Distortion correction, e.g. for pincushion distortion correction, S-correction using active elements
- H04N3/2335—Distortion correction, e.g. for pincushion distortion correction, S-correction using active elements with calculating means
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/10—Cameras or camera modules comprising electronic image sensors; Control thereof for generating image signals from different wavelengths
- H04N23/13—Cameras or camera modules comprising electronic image sensors; Control thereof for generating image signals from different wavelengths with multiple sensors
- H04N23/15—Image signal generation with circuitry for avoiding or correcting image misregistration
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/80—Camera processing pipelines; Components thereof
- H04N23/81—Camera processing pipelines; Components thereof for suppressing or minimising disturbance in the image signal generation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
- H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
- H04N3/16—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
- H04N3/22—Circuits for controlling dimensions, shape or centering of picture on screen
- H04N3/23—Distortion correction, e.g. for pincushion distortion correction, S-correction
Definitions
- the present invention relates to a method and a device for automatic correction of geometry, color overlay and image uniformity for a television camera.
- the shooting optics mainly bring distortions at the edge of the image, in the cushion or barrel.
- the analysis tube and its associated electronics do not make it possible to obtain (and measure) perfectly linear high-voltage ramps, all the more so since the reduction of the scanning noise makes it necessary to reduce the bandwidth as much as possible.
- amplifiers and that obtaining a faithful color image requires in addition to respecting the linearity between the time variable and the position of each point of the scene analyzed that the three electron beams of the three tubes R, G, B actually analyze simultaneously the three pieces of information from each same point in the source image.
- the optical system naturally participates in this distortion by the very fact that the magnification is dependent on the wavelength. Also the tube positioning deviations, the differential astigmatism between the tubes and the electronics by the dispersion of the characteristics of the components participate in these distortions.
- the presentation of a uniformly white scene to a tri-tube camera generally provides video signals at the output of each tube which present variations in level as a function of the positions of the points analyzed. This is due to the phenomenon of vignetting of the objective, to the phenomenon of diffusion of the charges in the shooting tubes at the periphery of the screen areas not scanned and to the variations in the scanning speed in particular along the vertical direction. of the image . All of these phenomena contribute to the appearance of white spots in the white parts of the image.
- One known method for solving this problem is to generate standard predistortion functions.
- This method is based on the assumption that if distortions appearing in the image the corrections to be made must be able to be expressed in the form of polynomials.
- the subject of the invention is a method of automatic correction of geometry, superposition of colors and uniformity of image for television camera by means of an optical test pattern placed in front of the camera composed of patterns of predetermined shape whose barycentres are located in a matrix organization at the intersection of regularly spaced rows and columns and by means of an electronic test pattern, image of the optical pattern, each homologous pattern of the optical pattern and the reference pattern being analyzed during the line scan of the camera by scanning means to supply two video signals characterized in that it consists in measuring the position error of the barycenters of the patterns restored by the camera relative to their positions respective on the electronic reference target, to calculate a first set of correction values to cancel the position errors of the ba rycentres, to be calculated for each pattern to be corrected, a second set of correction values for the position of the points of the patterns located in the middle of the line segments placed on either side of the barycentres by a cubic interpolation calculation taking into account for each pattern
- FIGS. 5A and 5B a representation of offsets between fronts corresponding to square symbols of two superimposed optical and electronic targets
- the method according to the invention consists in evaluating an error function at a large number of points N of the image supplied. by a television camera, to calculate the corresponding correction values from information provided by a standard test pattern comprising alternating lines of patterns in the shape of a rectangle or parallelogram, and to store these results in a coupled memory to a digital-analog converter injecting a correction signal either additive (scanning corrections or black spots) or multiplicative (correction of white spots). Perfect compensation for faults on the entire image requires: - exact compensation for faults measured at the N measurement points
- NCI NCL x NL - Q x P (1) in which:
- NCL designates the number of corrections per line (visible and non-visible area) NL is the number of measures per line and P is the number of measure lines for a type of pattern
- the set of errors measured during a first measurement pass on the N points is noted ⁇ _. , rk, i ⁇ ,
- - k is an integer such as O -f k - $ P-l corresponding to the number of the measurement line
- CP_. , rk, i is a "primary" correction corresponding to the error £. _, rk, i measured during the 1st pass
- THIS_. , l, c is a correction applied to the intersection of row 1 and column c and interpolated from the 4 closest primary corrections as will be described later. 1 and c verify the relations: 0 ⁇ 1 ⁇ NL-1 and 0 v ⁇ c ⁇ NCL-1
- the function f chosen is a cubic spline function chosen for its continuity and derivative properties, it ensures the most "natural" evolution possible between the corrections obtained on the measurement points of the same column.
- the chosen function is again a cubic function.
- a correction device according to the invention making it possible to obtain these results is shown in FIG. 1 inside a line formed in dotted lines.
- a processor 2 It comprises, organized around a processor 2, the following elements: a random access memory 3, a digital-to-analog converter 4, a filter 5, an analog adding circuit 6, a multiplexer 7, a counter for reading 8 and a measurement circuit 9.
- the memory 3 is addressed, through the multiplexer 7, in writing by an address line 10 connected to the processor 2 and in reading by the reading counter 8.
- the content of the counter of reading 8 is initialized by processor 2 by means of an initialization line 11.
- a data line 12 common to processor 2, to memory 3 and to digital-analog converter 4 carries the correction values calculated by processor 2 between processor 2, memory 3 and analog digital converter 4.
- a line 13 provides control of the measuring circuit 9 by the processor 2.
- Connections 14 and 15 make it possible to apply to the measuring circuit 9 video signals supplied on the one hand, by a standard test pattern and output on the other hand, by the camera to be corrected.
- the filter 5 filters the analog signal supplied by the digital-analog converter 4.
- the filtered voltage obtained is added in the adder circuit 6 to the sawtooth scanning signal supplied by the scanning circuit 11 of the analysis tube d camera image to be corrected. This arrangement makes it possible to re-read the correction values recorded in the memory 3 in synchronism with the video scanning signal of the camera.
- each intermediate correction interpolated between two adjacent primary corrections in the vertical direction of the image is calculated in deferred time by the processor 2 and then stored in the memory 3 instead of being calculated in real time by a. wired interpolator.
- the analog filter 5 performs the necessary smoothing between two successive corrections (line interpolation).
- the correction device which has just been described can be easily adapted to each scanning circuit of each of the green, blue and red image analyzer tubes, a single processor 2 taking charge calculations necessary for the correction of the three analysis tubes from a single measurement circuit that can optionally receive the three red, green and blue video signals in addition to the signal delivered by the standard test pattern.
- the correction values are produced by means of a high precision optical test pattern 12 shown in FIG. 2 and a measurement chain shown in FIG. 3.
- the measurement chain is formed by a television camera 20 to be corrected coupled to an electronic test pattern generator 21 coupled through the correction device 1 of FIG. 1.
- the optical test pattern 17 is placed in the measurement chain opposite the camera 20. In this way, each pattern analyzed during the line scan of the camera can be considered as formed by the juxtaposition of parallel straight segments of the same luminance and / or chrominance extending in the vertical direction of the crosshair. and other from its bary center.
- the electronic test pattern generator 21 produces a synthetic video signal which would be that provided by the camera 20 if the camera signal analysis chain were perfect.
- the evaluation of the error provided by the analysis chain is then obtained by measuring the time difference between the real video signal and the synthesized video signal applied to the links 14 and 15 of the measurement circuit 9 in FIG. 1. Examples of the appearance of these errors are given in FIGS. 4A to 4H.
- ⁇ v a distortion
- 6 personally 0
- the corresponding measured time offset ⁇ tMD shown in FIG. 4D is the result of a linear combination of the spatial offsets in horizontal and vertical.
- the alternation of rectangular and parallelogram patterns along the vertical axis makes it possible to estimate the horizontal spatial error on a parallelogram-shaped pattern as a function of the horizontal errors measured on the two surrounding rectangular patterns; and makes it possible to obtain patterns in the form of parallelograms informing only vertical distortion.
- the processor 2 of FIG. 1 can be programmed to not retain than the average values of the errors between the front and rear edges evaluated on the lines corresponding to the barycenters of the patterns of the electronic test pattern and on a frame only.
- This calculation also makes it possible to obtain a correct superposition of the red and blue signals with respect to the green signal.
- the differences in rise and fall times of the three signals due to the phenomena of attraction and astigmatism also lead to differences in the duration of the signals measured at 50% of their maximum amplitude.
- the calculation of the average value of the position of the fronts therefore distributes the colored border between two fronts and thus reduces its visibility.
- the set of coefficients which is chosen for the interpolation is formed by the coefficients of a third order polynomial function.
- the processor 2 locally calculates between each pair of consecutive vertical measurement points (M QJ ML), such as those represented in FIG. 6, a polynomial of the form:
- M. represents a measurement carried out on the middle of the pattern preceding the measurement point M-, that is to say, in the example described, that which is located 64 spaces above.
- M represents the measurement on the middle of the pattern following the measurement point M fl, ie in the case of the test pattern in FIG. 2, the one located 64 spaced below.
- the corrections of the columns for which there are no measurements are also calculated using a cubic polynomial.
- the corrections taken into account for the calculation of the coefficients a, b, c, d are on the columns where measurements were made the last and penultimate corrections of line n and the first and seconds of line n + 1.
- the smoothing between two adjacent measurement points in line is carried out by the low-pass analog filter 5.
- an additional 4 points calculated by a set of 4x4 coefficients are added to the 20 measured (or interpolated) points.
- the 12 most significant bits are applied to the digital-analog converter 4.
- the correction voltages obtained after filtering are added by the adder circuit 5 according to all known means not shown to the deflection voltages of the plates of the camera 20.
- the principle remains the same, but the correction is made on the video signal.
- the white spot corrections can be obtained in a similar way by modulating the control voltage of a variable gain amplifier to modify the amplitude of the video signal.
- the measurement circuit 9 is replaced by a detector which measures the amplitude of the video signal at different points of the image.
- the measurement points only those corresponding to the barycenters of the patterns of the electronic test pattern are retained and for each of them the relative amplitude difference is deduced from the central measurement points considered to have the reference level. We therefore try to ensure that all the measurement points have the same video level as the points located in the center of the image.
- the measurement of the time differences between fronts of homologous patterns of the optical test pattern 17 reproduced by the camera 20 and the electronic test pattern provided by the electronic test pattern generator 21 is based on the determination of the point of intersection of two ramps VL (t) and Vêt(t) of different slopes representable by linear relations of the form
- V 2 (t) & 1 (t- ⁇ t) (9) and triggered at the instants of appearance of each pattern to be compared.
- the first ramp VL (t) of slope ⁇ 'a .. (with ⁇ ' ⁇ 1) and of initial value V is triggered at the instant of appearance of the first of the two signals S and S, representing each homologous pattern to be compared.
- the second ramp VL (t) of slope equal to a., Begins at the instant of appearance of the second signal S or S, representing the second homologous pattern of the previous one to be compared.
- the quantity "" T o TTTT represents a time threshold value dependent on the initial value V of the first ramp V .. (t).
- This initial value has the advantage that it allows, when it is chosen to be large enough, to move the point of intersection of the two ramps away from their triggering instants to make the influence of the non-linearities present at the origin of the ramps negligible. , on the measurement of time t. Thanks to this arrangement, the time difference M between two consecutive edges of the signals S and S can be expanded and multiplied at will by the factor _. _ cooperate, This factor becoming very important as ⁇ 'approaches unity.
- the signals representing the two V- ramps. (t) and V furnish(t) are produced inside the measurement circuit 9.
- This circuit comprises, as shown in FIG. 8, an" OR “circuit 22, an” AND “circuit 23, a first circuit integrator 24, a second integrator circuit 25, a comparator circuit 26 and an analog-digital converter 27 whose input is connected to the output of the integrator V_, (t).
- the first integrator circuit 24 is initialized at the value V and is controlled by the output of the "OR” circuit 22 on the appearance of the first of the rising edges of the signals S or S, which occurs at the inputs of the "OR” circuit 22.
- the second integrator circuit 25 is controlled by the output of the "AND” circuit 23 when simultaneously the signals S,. and S., ..
- the first and second outings integrator circuits 24 and 25 are applied respectively to a first and second input of comparator circuit 26, the output of which is connected to a sampling control input of the analog-digital converter, the value of V_ (t) sampled at time t_ such as
- VL (fc) V pursue(t :) is a linear function of the difference ⁇ t separating these two events
- the digital values thus obtained are applied successively to the data bus 12 to allow the calculation by processor 2 of the average values of the measurement deviations between the rising and falling edges of each of the patterns analyzed.
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
- Color Television Image Signal Generators (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9000426A FR2657208B1 (fr) | 1990-01-16 | 1990-01-16 | Procede et dispositif de correction automatique de geometrie, de superposition de couleurs et d'uniformite d'image pour camera de television. |
FR90/00426 | 1990-01-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1991011075A1 true WO1991011075A1 (fr) | 1991-07-25 |
Family
ID=9392792
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR1991/000022 WO1991011075A1 (fr) | 1990-01-16 | 1991-01-14 | Procede et dispositif de correction automatique de geometrie, de superposition de couleurs et d'uniformite d'image pour camera de television |
Country Status (6)
Country | Link |
---|---|
US (1) | US5181098A (fr) |
EP (1) | EP0463149A1 (fr) |
JP (1) | JPH04505087A (fr) |
CA (1) | CA2047687A1 (fr) |
FR (1) | FR2657208B1 (fr) |
WO (1) | WO1991011075A1 (fr) |
Families Citing this family (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3165861B2 (ja) * | 1990-06-12 | 2001-05-14 | セイコープレシジョン株式会社 | カメラの特性誤差補正装置 |
US5345262A (en) * | 1992-07-31 | 1994-09-06 | Hughes-Jvc Technology Corporation | Automatic convergence system for color video projector |
US5581638A (en) * | 1993-07-26 | 1996-12-03 | E-Systems, Inc. | Method for autonomous image registration |
US5463429A (en) * | 1993-11-15 | 1995-10-31 | Eastman Kodak Company | Surface inspection optical geometry alignment system |
US5684498A (en) * | 1995-06-26 | 1997-11-04 | Cae Electronics Ltd. | Field sequential color head mounted display with suppressed color break-up |
WO1997041680A2 (fr) * | 1996-04-26 | 1997-11-06 | Philips Electronics N.V. | Generation de formes d'ondes spline |
US6542185B1 (en) * | 1998-01-07 | 2003-04-01 | Intel Corporation | Method and apparatus for automated optimization of white and color balance on video camera |
US6721694B1 (en) * | 1998-10-13 | 2004-04-13 | Raytheon Company | Method and system for representing the depths of the floors of the oceans |
US7023472B1 (en) * | 1999-04-23 | 2006-04-04 | Hewlett-Packard Development Company, L.P. | Camera calibration using off-axis illumination and vignetting effects |
US7119923B1 (en) * | 1999-07-23 | 2006-10-10 | Fuji Photo Film Co., Ltd. | Apparatus and method for image processing |
EP1176557A1 (fr) * | 2000-07-24 | 2002-01-30 | Setrix AG | Méthode et arrangement pour le calibrage de caméras |
US7151560B2 (en) * | 2002-06-20 | 2006-12-19 | Hewlett-Packard Development Company, L.P. | Method and apparatus for producing calibration data for a digital camera |
US7391450B2 (en) | 2002-08-16 | 2008-06-24 | Zoran Corporation | Techniques for modifying image field data |
US7388610B2 (en) | 2002-08-16 | 2008-06-17 | Zoran Corporation | Techniques of modifying image field data by extrapolation |
US7408576B2 (en) * | 2002-08-16 | 2008-08-05 | Zoran Corporation | Techniques for modifying image field data as a function of radius across the image field |
US6809330B2 (en) * | 2002-12-18 | 2004-10-26 | Lockheed Martin Corporation | Automatic calibration and built-in diagnostic procedures for line scan cameras |
EP1447977A1 (fr) * | 2003-02-12 | 2004-08-18 | Dialog Semiconductor GmbH | Compensation du vignettage |
US8149338B2 (en) * | 2004-09-29 | 2012-04-03 | Thomson Licensing | Method and apparatus for color decision metadata generation |
JP4977556B2 (ja) * | 2006-10-11 | 2012-07-18 | ルネサスエレクトロニクス株式会社 | 半導体集積回路装置および描画処理表示システム |
US9380297B1 (en) * | 2014-12-04 | 2016-06-28 | Spirent Communications, Inc. | Video streaming and video telephony uplink performance analysis system |
US11405695B2 (en) | 2019-04-08 | 2022-08-02 | Spirent Communications, Inc. | Training an encrypted video stream network scoring system with non-reference video scores |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0077239A1 (fr) * | 1981-10-02 | 1983-04-20 | Thomson-Csf | Dispositif de correction spatiale pour analyseur d'images |
EP0096600A1 (fr) * | 1982-05-14 | 1983-12-21 | Thomson-Csf | Mire optique pour la correction des défauts de convergence d'une caméra couleurs |
EP0176406A1 (fr) * | 1984-09-07 | 1986-04-02 | Thomson Video Equipement | Dispositif de correction des défauts d'uniformité induits dans les signaux issus d'une caméra de télévision par les variations de vitesse d'analyse |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4326219A (en) * | 1980-04-11 | 1982-04-20 | Ampex Corporation | Digital error measuring circuit for shading and registration errors in television cameras |
JPS587991A (ja) * | 1981-07-08 | 1983-01-17 | Sony Corp | 多管式カラ−カメラのレジストレ−シヨン調整回路 |
FR2525843B1 (fr) * | 1982-04-23 | 1986-06-27 | Thomson Csf | Dispositif de commande de correction et systeme d'etablissement automatique de donnees de correction d'une camera de television |
-
1990
- 1990-01-16 FR FR9000426A patent/FR2657208B1/fr not_active Expired - Lifetime
-
1991
- 1991-01-14 WO PCT/FR1991/000022 patent/WO1991011075A1/fr not_active Application Discontinuation
- 1991-01-14 JP JP3503122A patent/JPH04505087A/ja active Pending
- 1991-01-14 US US07/761,866 patent/US5181098A/en not_active Expired - Fee Related
- 1991-01-14 EP EP91903071A patent/EP0463149A1/fr not_active Ceased
- 1991-01-14 CA CA002047687A patent/CA2047687A1/fr not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0077239A1 (fr) * | 1981-10-02 | 1983-04-20 | Thomson-Csf | Dispositif de correction spatiale pour analyseur d'images |
EP0096600A1 (fr) * | 1982-05-14 | 1983-12-21 | Thomson-Csf | Mire optique pour la correction des défauts de convergence d'une caméra couleurs |
EP0176406A1 (fr) * | 1984-09-07 | 1986-04-02 | Thomson Video Equipement | Dispositif de correction des défauts d'uniformité induits dans les signaux issus d'une caméra de télévision par les variations de vitesse d'analyse |
Also Published As
Publication number | Publication date |
---|---|
US5181098A (en) | 1993-01-19 |
JPH04505087A (ja) | 1992-09-03 |
CA2047687A1 (fr) | 1991-07-17 |
FR2657208A1 (fr) | 1991-07-19 |
FR2657208B1 (fr) | 1992-04-10 |
EP0463149A1 (fr) | 1992-01-02 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO1991011075A1 (fr) | Procede et dispositif de correction automatique de geometrie, de superposition de couleurs et d'uniformite d'image pour camera de television | |
KR100202343B1 (ko) | 셰이딩 보정 장치 | |
EP0720125B1 (fr) | Dispositif de formation d'image et procédé pour effectuer des corrections de distorsions optiques géométriques dans une image | |
FR2652695A1 (fr) | Procede et dispositif de visualisation d'images, a correction automatique de defauts par contre-reaction. | |
JP4002504B2 (ja) | 校正投射表示システムおよび投射ディスプレイを校正する方法 | |
FR2524744A1 (fr) | Appareil de traitement d'images | |
FR2541842A1 (fr) | Reglage de l'image pour camera de television a circuits integres | |
EP3114831B1 (fr) | Débruitage vidéo optimisé pour système multicapteur hétérogène | |
FR2630282A1 (fr) | Recepteur de television et procede de reglage automatique de l'equilibre des blancs | |
FR2461414A1 (fr) | Procede d'accentuation de la nettete d'une image de reproduction | |
KR20040085366A (ko) | 베이어 패턴 컬러 신호에 대한 적응형 필터로 보간을수행하여 해상도를 높이는 보간기, 이를 구비한 디지털영상 신호 처리 장치, 및 그 방법 | |
US6072603A (en) | Multiple output CCD image block balancing | |
FR2543776A1 (fr) | Agencement de correction de distorsion de la trame dans un systeme de traitement video numerique | |
EP1249133B1 (fr) | Procede et dispositif de restitution d'un signal lumineux | |
FR2614488A1 (fr) | Camera de television en couleur a plusieurs tubes possedant un systeme de reglage automatique de la coincidence | |
KR20020088429A (ko) | 윤곽 필터 및 윤곽 필터로부터 윤곽 정보를 제공하는 방법 | |
EP0176406B1 (fr) | Dispositif de correction des défauts d'uniformité induits dans les signaux issus d'une caméra de télévision par les variations de vitesse d'analyse | |
US7916188B2 (en) | Correction approximating straight line group information generating method of multi-divided reading CCD, and correction processing device manufacturing method of multi-divided reading CCD | |
FR2536941A1 (fr) | Procede pour le filtrage en peigne, d'une image a l'autre, d'un signal composite de television et filtre en peigne a y utiliser | |
FR2818483A1 (fr) | Dispositif et procede de correction de convergence | |
JP2000115791A (ja) | カラ―画像記録装置における色値計算方法 | |
JPH0541867A (ja) | 固体撮像装置 | |
JPH077736A (ja) | 固体撮像装置 | |
EP0161948A1 (fr) | Dispositif de correction de tache au noir, et caméra de télévision équipée d'un tel dispositif | |
Martin | High-resolution color ccd camera |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): CA JP US |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): AT BE CH DE DK ES FR GB GR IT LU NL SE |
|
WWE | Wipo information: entry into national phase |
Ref document number: 1991903071 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2047687 Country of ref document: CA |
|
WWP | Wipo information: published in national office |
Ref document number: 1991903071 Country of ref document: EP |
|
WWR | Wipo information: refused in national office |
Ref document number: 1991903071 Country of ref document: EP |
|
WWW | Wipo information: withdrawn in national office |
Ref document number: 1991903071 Country of ref document: EP |