DK147954B - METHOD AND APPARATUS TO CONTROL THE CONTRAST BY REPRODUCTION - Google Patents
METHOD AND APPARATUS TO CONTROL THE CONTRAST BY REPRODUCTION Download PDFInfo
- Publication number
- DK147954B DK147954B DK146381A DK146381A DK147954B DK 147954 B DK147954 B DK 147954B DK 146381 A DK146381 A DK 146381A DK 146381 A DK146381 A DK 146381A DK 147954 B DK147954 B DK 147954B
- Authority
- DK
- Denmark
- Prior art keywords
- contrast
- densitometer
- reproduction
- raster
- image
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 9
- 238000005286 illumination Methods 0.000 claims description 19
- 238000000926 separation method Methods 0.000 claims description 2
- 239000003990 capacitor Substances 0.000 claims 1
- 238000005259 measurement Methods 0.000 description 3
- 238000004806 packaging method and process Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 208000010415 Low Vision Diseases 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004303 low vision Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/4209—Photoelectric exposure meters for determining the exposure time in recording or reproducing
- G01J1/4219—Photoelectric exposure meters for determining the exposure time in recording or reproducing specially adapted for enlargers
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Control Of Exposure In Printing And Copying (AREA)
- Facsimile Image Signal Circuits (AREA)
- Lasers (AREA)
Description
i 147954in 147954
Opfindelsen angår en fremgangsmåde til styring af kontrasten ved reproduktion, såsom rasterreproduktion, eksempelvis rasterreproduktion af halvtonebilleder ved hjælp af en hovedbelysning og en hjælpebelysning, idet man først ved hjælp af et densitometer udmåler sværtningen i såvel billedets lyseste område som billedets mørkeste område og dermed halvtonebilledets kontrastomfang, hvorefter man måler forholdet mellem den valgte baggrunds lyseste sted og originalens lyseste sted og korrigerer hovedbelysningen i overensstemmelse hermed og foretager en eksponering af en farvetoneskala med rasteret indlagt og aflæser det maksimale kontrastomfang (det omfang man vælger at arbejde med) og indstiller hjælpebelysningen i afhængighed af halvtonebilledets kontrastomfang og rasteromfanget, idet hjælpebelysningens procentdel af hovedbelysningen afhænger af halvtonebilledets kontrastomfang B og rasteromfanget R på énentydig måde, eventuelt efter formlenThe invention relates to a method for controlling the contrast by reproduction, such as raster reproduction, for example raster reproduction of halftone images by means of a main illumination and auxiliary illumination, first measuring by means of a densitometer the illumination in both the brightest area of the image and the darkest area of the image and thus the halftone image. , then measures the ratio of the brightest spot of the selected background to the brightest spot of the original, and corrects the main lighting accordingly, and exposes a color tone scale with the grid inlaid and reads the maximum contrast range (the scope you choose to work with) and sets the auxiliary lighting in dependency of the contrast tone of the halftone image and the raster extent, the percentage of auxiliary illumination of the main illumination depends on the contrast scope B of the halftone image and the raster extent R in a unambiguous manner, possibly according to the formula
. -io"B + io_R. -io "B + io_R
hjælpebelysning = -=- x 100% -10"B + 1 hvorefter halvtonebilledet eller den pågældende original vil kunne eksponeres, idet dog hovedbelysningen korrigeres, således at summen af hovedbelysningen og hjelpebelysningen i hovedsagen forbliver uændret, hvorhos udmålingen af sværtningen i såvel halvtonebilledets lyseste område som halvtonebilledets mørkeste område foretages ved at føre densitometeret hen til udvalgte punkter af halvtonebilledet, hvor aflæsningen foretages, hvorefter hjælpebelysningsprocenten beregnes på basis af sværtningen i henholdsvis lyseste og mørkeste område.auxiliary illumination = - = - x 100% -10 "B + 1 after which the halftone image or the original may be exposed, although the main illumination is corrected so that the sum of the main illumination and auxiliary illumination remains essentially unchanged, whereby the measurement of the blackness in both the brightest area of the halftone image remains unchanged. as the darkest area of the halftone image is made by passing the densitometer to selected points of the halftone image where the reading is performed, after which the auxiliary illumination percentage is calculated on the basis of the diffraction in the lightest and darkest areas, respectively.
Oprindeligt gjorde man brug af store og dyre densitometre til en pris af ca. 10.000-20.000 kr. Ved disse densitometre skulle man huske positionen af såvel lyseste som mørkeste sted. Efter beregning af flashprocenten kunne indtastning i det pågældende reproduktionskamera ske manuelt.Originally, large and expensive densitometers were used at a cost of approx. With these densitometers one should remember the position of both the brightest and darkest place. After calculating the flash percentage, entry into that reproduction camera could be done manually.
147954 2 Næste trin i udviklingen var et densitometer anvendt i forbindelse med en tabel, der angav flashprocenten i afhængighed af billedomfang og rasteromfang. Dette densitometer kunne fremstilles væsentligt billigere, idet man sparede regneenheden. Man skulle dog stadig huske lyseste og mørkeste sted.The next step in the evolution was a densitometer used in conjunction with a table that indicated the flash percentage depending on the image size and raster size. This densitometer could be made significantly cheaper, saving the calculator. However, one should still remember the brightest and darkest place.
Næste trin i udviklingen var, at man indbyggede en tabel i densitometeret - jvf. tysk offentliggørelsesskrift nr. 3.114.684. Man skulle dog stadig huske værdierne for lyseste og mørkeste sted, og der skulle stadig ske en indtastning af flashprocenten i reproduktionskameraet.The next step in the development was to incorporate a table in the densitometer - cf. German Publication No. 3,144,684. However, the values of the brightest and darkest places still had to be remembered, and the flash percentage had to be entered in the reproduction camera.
Næste trin i udviklingen er, at man ved hjælp af en direkte tilslutning til reproduktionskameraet foretager en on-line-måling og samtidigt lader en regneenhed i reproduktionskameraet foretage den ønskede beregning af flashprocenten. Derved udnytter man regneenheden i reproduktionskameraet. Man skal dog stadig huske værdierne for såvel lyseste som mørkeste sted.The next step in the development is that by means of a direct connection to the reproduction camera, an on-line measurement is made and at the same time a calculator in the reproduction camera allows the desired percentage of the flash percentage to be calculated. This utilizes the calculator in the reproduction camera. However, one must still remember the values for both the brightest and darkest places.
Ifølge opfindelsen er det anvist, hvorledes man ikke længere behøver at huske værdierne for lyseste og mørkeste sted, og détte formål er ifølge opfindelsen opnået ved, at den største henholdsvis den mindste værdi af sværtningen løbende registreres i et lager med stor hastighed, idet de beregninger af forskellige belysningsparametre, såsom hjælpebelysningsparametre, som er tidskrævende, og som skal foretages på basis af sværtningen i henholdsvis lyseste og mørkeste område, først foretages efter afslutningen af densitometerets bevægelse hen over billedet. Derved vil densitometeret samtidigt kunne bevæges hurtigere end hidtil kendt uden risiko for fejl, samtidigt med at densitometeret billiggøres, idet man sparer et display (med dertil hørende styrekredsløb).According to the invention, it has been disclosed how one no longer needs to remember the values for the brightest and darkest places, and according to the invention, this object is achieved by continuously recording the largest and the least value of the blackening in a high speed storage, since the calculations of various illumination parameters, such as auxiliary illumination parameters which are time consuming and which must be made on the basis of the illumination in the brightest and darkest areas respectively, are only made after the completion of the densitometer's movement across the image. This allows the densitometer to move at the same time faster than previously known without the risk of error, while at the same time lowering the densitometer by saving a display (with associated control circuits).
Opfindelsen angår også et apparat til udøvelse af fremgangsmåden ifølge opfindelsen omfattende en fotodiode og mindst 147954 3 én forstærker, som står i forbindelse med en A/D-omsætter. Apparatet er ejendommelig ved, at det har et lager til registrering af sværtningen i henholdsvis lyseste og mørkeste område, idet de beregninger af forskellige belysningsparametre, såsom hjælpebelysningsprocenten, som er tidskrævende, og som skal foretages på basis af sværtningen i henholdsvis lyseste og mørkeste område, først foretages efter afslutningen af densitometerets bevægelse hen over billedet. Derved opnås et særligt enkelt densitometer.The invention also relates to an apparatus for practicing the method according to the invention comprising a photodiode and at least one amplifier connected to an A / D converter. The apparatus is peculiar in that it has a store for recording the blackout in the lightest and darkest areas respectively, the calculations of various lighting parameters, such as the auxiliary lighting percentage, which are time consuming and which must be made on the basis of the blacking in the lightest and darkest areas respectively. is made only after the completion of the densitometer movement across the image. Thereby a particularly simple densitometer is obtained.
Den omstændighed, at densitometeret kan foretage en løbende registrering, kan udnyttes til aflæsning af en kode, eventuelt en stregkode,på det pågældende lysfølsomme materiales emballage og afgive information derom til den pågældende regneenhed, idet et gråtonefelt tjener som adskillelsesindikation i koden.The fact that the densitometer can make a continuous record can be utilized to read a code, possibly a bar code, on the packaging of the photosensitive material in question and to provide information thereon to the unit of calculation, a grayscale field serving as a separation indication in the code.
Opfindelsen skal nærmere forklares i det følgende under henvisning til tegningen, hvor fig. 1 viser et diagram over et densitometer til udøvelse af fremgangsmåden ifølge opfindelsen, fig. 2 et eksempel på en stregkode til emballagen af det lysfølsomme materiale.The invention will be explained in more detail below with reference to the drawing, in which 1 is a diagram of a densitometer for carrying out the method according to the invention; FIG. 2 shows an example of a barcode for the packaging of the photosensitive material.
Fremgangsmåden ifølge opfindelsen en videreudvikling af den i dansk patentansøgning nr. 1592/80 omtalte fremgangsmåde.The method according to the invention further develops the method mentioned in Danish Patent Application No. 1592/80.
Ifølge dette skrift aflæser man det maksimale kontrastomfang R (det rasteromfang man vælger at arbejde med, afhængigt af trykketeknikken) og indstiller hjælpebelysningen (flashprocenten) i afhængighed af det pågældende halvtonebilledes kontrastomfang B, idet hjælpebelysningens procentdel af hovedbelysningen afhænger af halvtonebilledets kontrastomfang B og rasteromfanget R efter formlen procent flash = ^ — x 100% -10"B + 1According to this writing, you read the maximum contrast scope R (the screen size you choose to work with depending on the printing technique) and set the auxiliary lighting (flash percentage) depending on the contrast scope B of the halftone image, since the auxiliary lighting percentage of the main illumination depends on the contrast scope B of the halftone image by the formula percent flash = ^ - x 100% -10 "B + 1
Derved kan man på enkel måde fastlægge hjælpebelysningen i afhængighed af filmens følsomhed og rasterens udformning, således at man udnytter hele det kontrastomfang, der er til 147954 4 rådighed og alligevel får al information med ved reproduktionen. Endvidere måler man forholdet mellem den valgte baggrunds lyseste sted og korrigerer såvel hoved- som hjælpebelysnin-gen i overensstemmelse hermed. Ifølge opfindelsen er det anvist, hvorledes denne procedure vil kunne foretages automatisk. Ved hjælp af et densitometer måles såvel højlys- som skygge-værdien (enten ved reflektion eller transmission), idet man eventuelt udlæser en spænding svarende til differensen (eksempelvis ved at man foretager en nulstilling ved hjælp af højlyset). Udmålingen af sværtningen i såvel halvtonebilledets lyseste område som i halvtonebilledets mørkeste område foretages ved at bevæge densitometeret hen over halvtonebilledet, idet et lager ΙΑ, IB husker såvel den største som den mindste værdi af reflektionen (transmissionen), og flashprocenten vil kunne beregnes af en regneenhed efter afslutningen af densitometerets bevægelse hen over billedet. En fordel ved denne fremgangsmåde er, at den er hurtigere og eventuelt vil kunne foretages af en svagtsynet operatør. Densitomete-ret vil kunne bevæges med en hastighed på 20-200 cm/sek. En af årsagerne til, at bevægelsen vil kunne foretages så hurtigt, er, at minimums- og maksimumsværdierne først indlæses i regneenheden, efter at densitometerets bevægelse er afsluttet.In this way, one can easily determine the auxiliary illumination depending on the sensitivity of the film and the layout of the screen, so that the full amount of contrast available for 147954 4 is obtained and yet all information is included in the reproduction. Furthermore, one measures the ratio of the brightest location of the selected background and corrects both the main and auxiliary lighting accordingly. According to the invention, it has been disclosed how this procedure can be performed automatically. Using a densitometer, both the highlight and shadow values (either by reflection or transmission) are measured, possibly reading a voltage corresponding to the difference (for example, by performing a reset using the highlight). The measurement of the diffraction in both the brightest area of the halftone image and in the darkest area of the halftone image is made by moving the densitometer over the halftone image, where a memory ΙΑ, IB remembers both the largest and the smallest value of the reflection (transmission) and the flash percentage can be calculated by a unit of calculation upon completion of the densitometer movement across the image. An advantage of this approach is that it is faster and possibly can be performed by a low-vision operator. The densitometer can be moved at a speed of 20-200 cm / sec. One of the reasons why the movement can be made so quickly is that the minimum and maximum values are only entered into the calculator after the movement of the densitometer is completed.
Selve densitometeret udgøres af en fotodiode, hvorfra signalet via en eller flere forstærkere går til en A/D-omsætter. De digitaliserede værdier for lyseste og mørkeste sted går til hver sit lager ΙΑ, IB, idet signalerne herfra først videreføres, når densitometerets bevægelse hen over billedet som før nævnt er afsluttet.The densitometer itself consists of a photodiode from which the signal goes to an A / D converter via one or more amplifiers. The digitized values for the brightest and darkest places go to each store ΙΑ, IB, the signals thereof being transmitted only when the movement of the densitometer across the image as previously mentioned is completed.
Densitometerets registrering starter selvsagt først,når det respektive belysningsorgan er nået op på fuld styrke. Densitorneteret kan desuden være indrettet til at foretage en aflæsning af en kode, eventuelt en stregkode på det pågældende lysfølsomme materiales emballage og afgive information til regneenheden.Of course, the registration of the densitometer starts only when the respective lighting device has reached full strength. In addition, the density meter may be arranged to read a code, possibly a bar code on the packaging of the photosensitive material in question and to provide information to the calculator.
Claims (2)
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DK146381A DK147954B (en) | 1981-03-31 | 1981-03-31 | METHOD AND APPARATUS TO CONTROL THE CONTRAST BY REPRODUCTION |
| GB8208111A GB2096336B (en) | 1981-03-31 | 1982-03-19 | Controlling contrast |
| NL8201204A NL8201204A (en) | 1981-03-31 | 1982-03-23 | METHOD AND APPARATUS FOR CONTROLLING THE CONTRAST IN REPRODUCTION |
| DE19823211059 DE3211059A1 (en) | 1981-03-31 | 1982-03-25 | METHOD AND DEVICE FOR CONTROLLING THE CONTRAST IN REPRODUCTION |
| JP5222282A JPS5816238A (en) | 1981-03-31 | 1982-03-30 | Control of duplicated concentration and optical densitometer used for executing same |
| JP7663390U JPH0318540U (en) | 1981-03-31 | 1990-07-20 |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DK146381 | 1981-03-31 | ||
| DK146381A DK147954B (en) | 1981-03-31 | 1981-03-31 | METHOD AND APPARATUS TO CONTROL THE CONTRAST BY REPRODUCTION |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DK146381A DK146381A (en) | 1982-10-01 |
| DK147954B true DK147954B (en) | 1985-01-14 |
Family
ID=8105110
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DK146381A DK147954B (en) | 1981-03-31 | 1981-03-31 | METHOD AND APPARATUS TO CONTROL THE CONTRAST BY REPRODUCTION |
Country Status (5)
| Country | Link |
|---|---|
| JP (2) | JPS5816238A (en) |
| DE (1) | DE3211059A1 (en) |
| DK (1) | DK147954B (en) |
| GB (1) | GB2096336B (en) |
| NL (1) | NL8201204A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0095201B1 (en) * | 1982-05-26 | 1986-08-27 | Helioprint A/S | Reproduction camera |
| NL8301858A (en) * | 1983-05-26 | 1984-12-17 | Oce Helioprint As | REPRODUCTION CAMERA. |
| US4812882A (en) * | 1986-10-14 | 1989-03-14 | Ciba-Geigy Ag | Contrast monitor |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1186317B (en) * | 1963-08-06 | 1965-01-28 | Buescher & Jahn | Method and device for measuring the exposure for the production of halftone and halftone films from halftone negatives or color extracts in reproduction photography |
| JPS5913011B2 (en) * | 1974-06-21 | 1984-03-27 | 富士写真フイルム株式会社 | Photographic printing exposure control method |
| DK153426B (en) * | 1977-04-12 | 1988-07-11 | Eskofot As | PROCEDURE FOR MANAGING CONTRAST BY RASTER EPRODUCTION |
-
1981
- 1981-03-31 DK DK146381A patent/DK147954B/en not_active Application Discontinuation
-
1982
- 1982-03-19 GB GB8208111A patent/GB2096336B/en not_active Expired
- 1982-03-23 NL NL8201204A patent/NL8201204A/en not_active Application Discontinuation
- 1982-03-25 DE DE19823211059 patent/DE3211059A1/en active Granted
- 1982-03-30 JP JP5222282A patent/JPS5816238A/en active Pending
-
1990
- 1990-07-20 JP JP7663390U patent/JPH0318540U/ja active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| GB2096336A (en) | 1982-10-13 |
| DE3211059A1 (en) | 1982-11-11 |
| NL8201204A (en) | 1982-10-18 |
| DE3211059C2 (en) | 1993-01-07 |
| JPS5816238A (en) | 1983-01-29 |
| DK146381A (en) | 1982-10-01 |
| JPH0318540U (en) | 1991-02-22 |
| GB2096336B (en) | 1986-02-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPS6339908B2 (en) | ||
| US4636845A (en) | Digital image processing method for over and under exposed photographic images | |
| GB2065903A (en) | Exposure time control | |
| US3734630A (en) | Copy density reading and exposure control system | |
| JPS63184483A (en) | Apparatus for correcting color at the time of platemaking | |
| JPS62500747A (en) | Method for detecting and printing color photographic images exposed with narrowband illumination light | |
| UA58539C2 (en) | Method for automatically monitoring quality of printing by an adjustable template | |
| DK147954B (en) | METHOD AND APPARATUS TO CONTROL THE CONTRAST BY REPRODUCTION | |
| JPH084318B2 (en) | Color original image reproduction method and apparatus | |
| US5084727A (en) | Method and apparatus for photographic exposure using an LCD pad | |
| CA1230291A (en) | Automatic color analysis based on minimum/maximum video level | |
| JPS61123985A (en) | Picture processor | |
| US4651199A (en) | Method for detecting blank frames in a photographic color printer | |
| US3542470A (en) | Automatic computing density range coupled light integrator | |
| US4420384A (en) | Method for determining boundary points on electrophoretic patterns and means therefor | |
| JP3179874B2 (en) | Teaching method and teaching device for image inspection device | |
| US3796491A (en) | Copy density reading and exposure control system | |
| JPS6129275A (en) | Method of correcting half tone picture | |
| US4378157A (en) | Method of controlling the contrast by reproduction such as screen reproduction | |
| JPH0679862A (en) | Method for inspecting quality of printing paper surface and apparatus therefor | |
| JPS58153328A (en) | Photodetecting sensitivity irregularity correcting system for image sensor | |
| EP0261407A3 (en) | Method and device for the automatic focussing in a photographic enlarging or copying apparatus with a variable enlargement scale | |
| JPS6112175A (en) | Sensor output correcting circuit | |
| JP2902899B2 (en) | Automatic density correction method when reading radiation transmission test film | |
| JPH011576A (en) | Print inspection method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PBP | Patent lapsed | ||
| PRF | Application refused |