Color image reproduction of scenes with preferential tone mapping

US 5,447,811 A
Filed: 03/23/1994
Issued: 09/05/1995
Est. Priority Date: 09/24/1992
Status: Expired due to Term

First Claim

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1. A method of presenting a reproduction of an original scene in color with a preferential tone mapping, the method including the steps of capturing original scene parameters and creating a visual reproduction of the scene, the method additionally comprising:

performing a transformation of said captured scene parameters, said transformation being such that, taken in conjunction with untransformed characteristics of the capturing and creating steps, it results in a reproduced tone mapping having instantaneous gamma values of viewed reproduction density relative to density of the original scene which are greater than a minimum value of A and less than A plus 0.35 times scene exposure density over a scene exposure density range of from 0.60 to 1.45 as measured relative to a zero density, 100% diffuse reflector in the original scene, the instantaneous gamma values within scene exposure density range further lying entirely within a range of values subtended by an angle of 14°

measured from a reference point at 0.0 scene exposure density and a viewed reproduction density gradient of A, wherein A is 1.0 in the case of direct view reflection media reproduction, 1.1 in the case of self-illuminated reproduction for viewing with ambient surround, and 1.3 in the case of a reproduction for viewing with dark surround.

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Abstract

A system and method of image reproduction in color with preferential tone mapping are provided in which the method includes the steps of capturing original scene parameters and creating a visual reproduction of the scene, the method additionally comprising:

performing a transformation of said captured scene parameters, said transformation being such that, taken in conjunction with untransformed characteristics of the capturing and creating steps, it results in a reproduced tone mapping having instantaneous gamma values of viewed reproduction density relative to density of the original scene which are greater than a minimum value of A and less than A plus 0.35 times scene exposure density over a scene exposure density range of from 0.60 to 1.45 as measured relative to a zero density, 100% diffuse reflector in the original scene, the instantaneous gamma values within scene exposure density range further lying entirely within a range of values subtended by an angle of 14° measured from a reference point at 0.0 scene exposure density and a viewed reproduction density gradient of A, wherein A is 1.0 in the case of direct view reflection media reproduction, 1.1 in the case of self-illuminated reproduction for viewing with ambient surround, and 1.3 in the case of a reproduction for viewing with dark surround.

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121 Claims

1. A method of presenting a reproduction of an original scene in color with a preferential tone mapping, the method including the steps of capturing original scene parameters and creating a visual reproduction of the scene, the method additionally comprising:
- performing a transformation of said captured scene parameters, said transformation being such that, taken in conjunction with untransformed characteristics of the capturing and creating steps, it results in a reproduced tone mapping having instantaneous gamma values of viewed reproduction density relative to density of the original scene which are greater than a minimum value of A and less than A plus 0.35 times scene exposure density over a scene exposure density range of from 0.60 to 1.45 as measured relative to a zero density, 100% diffuse reflector in the original scene, the instantaneous gamma values within scene exposure density range further lying entirely within a range of values subtended by an angle of 14°
  
  measured from a reference point at 0.0 scene exposure density and a viewed reproduction density gradient of A, wherein A is 1.0 in the case of direct view reflection media reproduction, 1.1 in the case of self-illuminated reproduction for viewing with ambient surround, and 1.3 in the case of a reproduction for viewing with dark surround.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121)
- - 2. The method of claim 1 wherein said capturing step comprises exposing said original scene parameters onto photographic positive or negative film having said scene parameters transformation embodied in the film.
  - 3. The method of claim 1 wherein said creating step comprises reproducing said scene on positive or negative media to be viewed, said media having said scene parameters transformation embodied therein.
  - 4. The method of claim 3 in which said media is to be viewed by reflection.
  - 5. The method of claim 4 in which said media consists of silver halide based photographic print paper.
  - 6. The method of claim 1 in which said capturing step comprises exposing original scene parameters onto photographic film and wherein said method further comprises the steps of (a) optoelectronically scanning said film to produce image pixel density-representative signals and (b) adjusting the amplitudes of said pixel signals in accordance with said scene parameter transformation.
  - 7. The method of claim 6 wherein said pixel signals after transformation are applied to one or more types of viewable output media for creation of said visual reproduction, said output media types comprising (a) non-silver-halide-based photographic reflection print paper, (b) silver-halide-based photographic reflection print paper, (c) self-illuminated image reproduction device and (d) transparent or semi-transparent transmission media.
  - 8. The method of claim 1 wherein different regions of preferential tone mapping of said instantaneous gamma values subtended by said angle exist between said minimum and maximum values and said creating step includes a step of classifying said scene to be reproduced and a step of selecting a region of said instantaneous gamma according to the classification of said scene to be reproduced.
  - 9. The method of any one of claims 1 through 8 wherein the visual reproduction is a self illuminated image to be viewed with ambient surround and A=1.1.
  - 10. The method of any one of claims 1 through 8 wherein the visual reproduction is to be viewed with a dark surround and A=1.3.
  - 11. The method of claim 1 wherein said capturing step comprises exposing the original scene parameters onto photographic film.
  - 12. The method of claim 11 wherein the film contains a light-sensitive silver halide emulsion.
  - 13. The method of claim 12 wherein the film is negative or positive working.
  - 14. The method of claim 12 wherein the film is semi-reflective film or reflective paper.
  - 15. The method of claim 11 wherein the film is a scan-only film not designed for viewing.
  - 16. The method of claim 11 wherein the film is instant film designed for instant development.
  - 17. The method of claim 11 wherein the film contains at least one non-photo sensitive information carrying layer.
  - 18. The method of claim 17 wherein said information carrying layer is a magnetic layer.
  - 19. The method of claim 1 wherein the image is captured by a two- or three-dimensional camera.
  - 20. The method of claim 12 wherein the image captured is subjected to development.
  - 21. The method of claim 11 wherein the image formed on said film is subsequently scanned to read out the image.
  - 22. The method of claim 11 wherein the film is a reversal film.
  - 23. The method of claim 1 wherein said capturing step comprises exposing the original scene parameters to electronic sensors, photomultiplier tubes or storage phosphors.
  - 24. The method of claim 23 wherein said sensors comprise electronic sensors.
  - 25. The method of claim 24 wherein said sensors are charge coupled device (CCD) sensors.
  - 26. The method of claim 1 wherein the captured scene parameters are magnetically, optically, electronically, chemically, or biologically stored, before or after transformation.
  - 27. The method of claim 23 wherein the scene parameters are captured by a two- or three-dimensional camera.
  - 28. The method of claim 1 wherein the capturing step includes forming a representation of the original scene and thereafter obtaining information related to the scene parameters from the representation rather than from the original scene.
  - 29. The method of claim 28 wherein said representation is a negative photographic element of the original scene.
  - 30. The method of claim 28 wherein said representation is a self-illuminated display.
  - 31. The method of claim 28 wherein said representation is a computer simulation.
  - 32. The method of claim 28 wherein the representation is a photographic intermediate.
  - 33. The method of claim 28 wherein the representation is a photographic internegative.
  - 34. The method of claim 28 wherein the representation is a photographic interpositive.
  - 35. The method of claim 28 wherein the representation is a on a reflective media.
  - 36. The method of claim 1 wherein the capturing step includes the step of classifying said original scene based on a scene parameter or capture condition.
  - 37. The method of claim 36 wherein said classifying is based on the scene parameter of contrast range.
  - 38. The method of claim 36 wherein said classifying is based on the capture condition of light source.
  - 39. The method of claim 36 wherein said classifying is based on the capture condition of exposure time.
  - 40. The method of claim 36 wherein said classifying is based on the capture condition of a zoom lens status.
  - 41. The method of claim 36 wherein said classifying is based on optically scanning a representation of the original scene.
  - 42. The method of claim 28 wherein the capturing step includes imagewise exposing a photographic film having a magnetic layer thereon, on which is recorded capture condition information.
  - 43. The method of claim 1 wherein the captured scene parameters are stored, before or after transformation.
  - 44. The method of claim 43 wherein the captured parameters are stored in analog form.
  - 45. The method of claim 43 wherein the captured parameters are stored in digital form.
  - 46. The method of claim 45 wherein the captured parameters are stored by optically reading a nonelectronic representation of the original scene and converting the resulting signal to electronic form.
  - 47. The method of claim 43 wherein the captured parameters are stored in an optically readable form, either before or after the transforming step.
  - 48. The method of claim 47 wherein the captured parameters are stored on a compact disc.
  - 49. The method of claim 43 wherein the parameters are stored in magnetically readable form.
  - 50. The method of claim 49 wherein the parameters are stored on a memory card.
  - 51. The method of claim 49 wherein the parameters are stored on a magnetic hard drive.
  - 52. The method of claim 49 wherein the parameters are stored on a magneto-optical drive.
  - 53. The method of claim 1 wherein analog or digital electronic signals are used to capture and/or store the original scene parameters.
  - 54. The method of claim 53 wherein said signals are converted between analog and digital form or vice versa.
  - 55. The method of claim 54 wherein said signals are converted by sigma-delta modulation, parallel comparator, integrating converters, successive approximation, dual slope, or binary counting with error feedback.
  - 56. The method of claim 53 wherein the digital levels are sufficient to distinguish at least 256 levels of gray.
  - 57. The method of claim 1 wherein the transformation step comprises a chemical alteration of the original scene parameters.
  - 58. The method of claim 57 wherein the transformation step comprises a chemical alteration of the original scene parameters during the processing of photographic film used to capture the original scene parameters.
  - 59. The method of claim 57 wherein the transformation step comprises the formation of an internegative, interpositive, or other intermediate representation in combination with chemical alteration of the original scene parameters or those of a representation of the original scene parameters.
  - 60. The method of claim 57 wherein the transformation step comprises an instant developer chemical which alters the parameters of the scene as originally captured.
  - 61. The method of claim 57 wherein the transformation step is performed digitally in a camera employed in the capturing step.
  - 62. The method of claim 1 wherein the transformation step comprises optical processing.
  - 63. The method of claim 62 wherein the transformation step comprises modification of digital or analog signals.
  - 64. The method of claim 1 wherein the transforming step is performed in a camera.
  - 65. The method of claim 1 wherein the transforming step is performed as part of the process of creating a direct view visual reproduction.
  - 66. The method of claim 65 wherein the process of creating said direct view visual reproduction comprises an optical printing step.
  - 67. The method of claim 63 wherein the transforming is performed in a camera either before or after storage in the camera.
  - 68. The method of claim 63 wherein the transforming step is performed either before or after storage by a computer.
  - 69. The method of claim 1 wherein the transformation step comprises a classification step which determines the desired tone mapping boundaries for a particular scene within the overall boundaries of the invention.
  - 70. The method of claim 69 wherein said classification is made on the basis of the range of exposures in the captured scene parameters in the original scene.
  - 71. The method of claim 69 wherein said classification is made on the basis of the distribution of exposures in the captured scene parameters in the original scene.
  - 72. The method of claim 71 wherein said classification is made on the basis of a frequency distribution of pixel exposure values in the captured scene parameters in the original scene.
  - 73. The method of claim 69 wherein said classification is accomplished by a predetermined algorithm which affects the manner in which the tone scale parameters are altered.
  - 74. The method of claim 69 wherein said classification is accomplished by a predetermined algorithm which chooses between two or more visual reproduction print media having different densitometric characteristics.
  - 75. The method of claim 74 wherein said classification is accomplished by a predetermined algorithm which alters the densitometric characteristics of a visual reproduction media.
  - 76. The method of claim 69 wherein said classification is based on a capture condition.
  - 77. The method of claim 69 wherein said classification is based on the results of scanning a representation of the original scene.
  - 78. The method of claim 69 wherein said classification is based on digitally captured scene parameters.
  - 79. The method of claim 1 wherein rendering is performed to modify the original scene parameters to take into account the manipulative characteristics of a particular device for producing a viewable reproduction.
  - 80. The method of claim 79 wherein said rendering is suitable for the production of a conventional optically printed reflective color print.
  - 81. The method of claim 79 wherein said rendering is suitable for the production of a thermal dye-transfer hardcopy print.
  - 82. The method of claim 79 wherein said rendering is suitable for the production of an ink jet produced hardcopy print.
  - 83. The method of claim 79 wherein said rendering is suitable for the production of a wax hardcopy print.
  - 84. The method of claim 79 wherein said rendering is suitable for the production of an electrophotographic hardcopy print.
  - 85. The method of claim 1 wherein the visual reproduction is created in using at least one process selected from the group consisting of optical reproduction, thermal dye-transfer, ink jet, wax, and electrophotographic printing.
  - 86. The method of claim 1 wherein the visual reproduction created is a reflective color print.
  - 87. The method of claim 1 wherein the visual reproduction created is a thermal dye-transfer print.
  - 88. The method of claim 1 wherein the visual reproduction created is a self-illuminated image to be viewed with ambient surround.
  - 89. The method of claim 1 wherein the visual reproduction created is to be viewed with a dark surround.
  - 90. The method of claim 1 wherein the visual reproduction is a transparent or semitransparent film.
  - 91. The method of claim 1 wherein the visual reproduction is a reflective color print produced by dye diffusion.
  - 92. The method of claim 1 wherein the visual reproduction is an LCD image.
  - 93. The method of claim 1 wherein the method of image formation in the visual reproduction is half-tone, continuous tone, or complete material transfer.
  - 94. The method of claim 1 wherein the visual reproduction is an LED image.
  - 95. The method of claim 1 wherein the visual reproduction is a CRT image.
  - 96. The method of claim 1 wherein the original scene is captured as an image on a photographic film, the film image is optically scanned to produce electronic signals, either before or after development, the resulting electronic signals processed to transform the signals to the desired parameter for preferential tone scale, and the resulting signals used to create a visual reproduction which is (1) for direct view, (2) self illuminated for viewing with ambient surround or (3) for viewing with dark surround.
  - 97. The method of claim 96 wherein the film on which the original scene parameters are captured is subjected to color negative processing.
  - 98. The method of claim 96 wherein the film on which the original scene parameters are captured is subjected to color reversal processing.
  - 99. The method of claim 96 wherein the signals represent a digitized version of the scene parameters.
  - 100. The method of claim 1 wherein the original scene is captured as an image on a photographic film which is developed and then optically printed on a photographic media for direct viewing which media includes chemicals for transforming the tone mapping into the preferential tone mapping for creating the preferred reproduction.
  - 101. The method of claim 97 or 98 wherein the visual reproduction is one for direct viewing.
  - 102. The method of claim 97 or 98 wherein the visual reproduction is self illuminated for viewing with ambient surround.
  - 103. The method of claim 97 or 98 wherein the visual reproduction is for viewing with dark surround.
  - 104. The method of claim 103 wherein the capture, transformation, and reproduction steps are conducted in rapid sequence to provide an instant reproduction.
  - 105. The method of claim 104 wherein the transformation is accomplished by chemical reaction.
  - 106. The method of claim 104 wherein the transformation is accomplished electronically.
  - 107. The method of claim 1 wherein the capture, transformation, and reproduction steps are conducted in rapid sequence to provide an instant reproduction.
  - 108. The method of claim 1 wherein the original scene is captured by exposing the original scene parameters to electronic sensors, the resulting electronic signal processed to transform the signals to the desired parameters for preferential tone scale, and the resulting signals used to create a reproduction which is (1) for direct view, (2) self illuminated for viewing with ambient surround or (3) for viewing with dark surround.
  - 109. The method of claim 96 wherein the scene is captured on photographic film which is then subjected to negative processing.
  - 110. The method of claim 109 wherein the reproduction created is one for direct view.
  - 111. The method of claim 109 wherein the reproduction created is a self-illuminated for viewing with ambient surround.
  - 112. The method of claim 110 wherein the reproduction created is for viewing with dark surround.
  - 113. The method of claim 96 wherein the scene is captured on photographic film which is then subjected to reversal processing.
  - 114. The method of claim 113 wherein the reproduction created is one for direct view.
  - 115. The method of claim 113 wherein the reproduction created is a self-illuminated for viewing with ambient surround.
  - 116. The method of claim 113 wherein the reproduction created is for viewing with dark surround.
  - 117. The method of claim 1 wherein the transformation is performed as part of the capturing step.
  - 118. The method of claim 1 wherein the transformation is performed after the capturing step and before a step of storing scene parameters.
  - 119. The method of claim 1 wherein the transformation step is performed after a step of storing scene parameters and before creating the reproduction.
  - 120. The method of claim 1 wherein the transformation step is performed as part of the step of creating the reproduction.
  - 121. The method of claim 1 wherein the transformation step is a separate step performed between the step of capturing the original scene parameters and the step of creating the visual reproduction.

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Current Assignee
Eastman Kodak Company
Original Assignee
Eastman Kodak Company
Inventors
Buhr, John D., Franchino, Harry D.
Primary Examiner(s)
SCHILLING, RICHARD L

Application Number

US08/219,042
Time in Patent Office

531 Days
Field of Search

430/20, 430/30, 430/370, 430/43, 430/359, 430/363, 346/75, 503/227, 355/32, 355/40, 355/35, 355/77, 358/78, 358/80, 358/332, 358/333
US Class Current

430/20
CPC Class Codes

G03B 27/735 in dependence upon automati...

H04N 1/407 Control or modification of ...

Color image reproduction of scenes with preferential tone mapping

First Claim

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Abstract

157 Citations

121 Claims

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Color image reproduction of scenes with preferential tone mapping

First Claim

2 Assignments

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Abstract

157 Citations

121 Claims

Specification

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