Abstract: According to this method, for the formulation and recording of the retrieval data, each of the images (2) taking the form of a two-dimensional array of rows and columns of pixels, the image is divided into blocks (4) of pixels, each block (4) comprising pixels of at least two rows and two columns, retrieval data are calculated for each block (4) on the basis of at least the image data contained in the pixels of this block (4) and the retrieval data calculated is recorded in the form of at least one pixel (5) exhibiting a value dependent on the retrieval data.

Abstract: According to this method, there is recorded on the same recording medium (1): a) an encoded recording (A) of the data allowing them to be read automatically, b) a recording (B), intended for intuitive visual reading, of the knowledge necessary for using means for decoding (MD) the data in order to read them automatically.

Abstract: According to this method, for the formulation and recording of the retrieval data, each of the images (2) taking the form of a two-dimensional array of rows and columns of pixels, the image is divided into blocks (4) of pixels, each block (4) comprising pixels of at least two rows and two columns, retrieval data are calculated for each block (4) on the basis of at least the image data contained in the pixels of this block (4) and the retrieval data calculated is recorded in the form of at least one pixel (5) exhibiting a value dependent on the retrieval data.

Abstract: Examples consistent with the invention include a reusable device for writing, displaying and deleting information with an electronic device on a support device having bistable liquid crystals. The reusable device includes a substrate onto which are successively applied and from the substrate: an electricity conducting coating; an optical coating that can absorb all or part of the surrounding light; a coating of a transparent substance in which a plurality of bistable liquid crystals are emulsioned; at least one electricity conducting element being electrically connected to the electricity conducting coating via an electrical voltage generator to form an electric circuit.

Abstract: A method of simulation of a recording support rendering called target rendering is provided.

Abstract: Exposure device for writing mixed data onto a photosensitive support comprising: a light source (10), supplying an exposure light; a first two-dimension pixel matrix modulator (50), and a neutral optical filter means (12) having at least two different optical densities, the modulator and the filter being arranged in series on an optical path of the exposure light coming from the source (10). Application to motion picture cameras.

Abstract: A method of digital exposure modification of shot images of a photographic support (10) comprising the shot images (12) and at least one sensitometry control (16), includes the digitization (20), in more or less the same conditions, of the images and the sensitometry control, in order to link at least one digital code to the image pixels and the sensitometry control pixels; the establishment of at least one sensitometry relationship (22) from the various exposure values of the sensitometry control and the digital codes linked to the pixels corresponding to these values; the shift of at least one part of the digital codes of the image pixels, each code being shifted by a value established according to a required modification amplitude of the exposure and, with respect for the sensitometry relationship.

Abstract: The invention relates to a method of recording data on a photographic support (10), comprising the formation on the support of many encoding marks (14a, 14b), linked to many data items to be recorded, each encoding mark being formed with an exsposure energy that is preset function of a data value to be recorded linked to the mark, and the information, on the same support, of at least one sensitometry control (16) the sensitometry control covering a range of exposure energies used to form the marks.

Abstract: A method of simulation of a recording support rendering called target rendering is provided.

Abstract: Exposure device for writing mixed data onto a photosensitive support comprising: a light source (10), supplying an exposure light; a first two-dimension pixel matrix modulator (50), and a neutral optical filter means (12) having at least two different optical densities, the modulator and the filter being arranged in series on an optical path of the exposure light coming from the source (10). Application to motion picture cameras.

Abstract: The invention relates to a method of recording of digital data on a photographic support, comprising the conversion of the data into color and/or density values and the writing, for each data item, of at least one writing range, whose color and/or density correspond to the data, characterized in the fact that the ranges are arranged in a plurality of uniform blocks of writing ranges uniformly covering a writing zone of the photographic support, the blocks each being formed of at least one writing range and being associated with at least one position mark fixed to the support respectively.

Abstract: A method of writing preservation data onto a photographic medium (10) wherein the preservation data are converted into color and/or exposure energy values and wherein, for each preservation data item, at least one writing range (15) of the medium is exposed with the energy and/or color corresponding to said preservation data item, characterized in that the writing ranges (15) are arranged in rows (16) and columns (18), such as in a matrix (12), and in that each row and column of the matrix is linked to at least one control range (24, 26) exposed with an energy and/or color corresponding to at least one control data item created from the preservation data linked to the writing ranges, of the row and column, respectively.

Abstract: The present invention is in the technical field of image digitizers or scanners. It relates to a method and device that enables the automatic calibration of digitizing equipment. The method and device of the invention enable the auto-calibration of a digitizing device by taking into account sensitometric data specific to a film strip to be digitized, to automatically adjust the digitizing parameters of the digitizing device, according to these sensitometric data and without operator intervention. The application field of the invention more especially relates to the users of digitizing equipment dedicated to motion picture films.

Abstract: The present invention is in the field of photography and is used to measure the sensitometric characteristics of a photographic element, such as a photographic film strip. The present invention relates more particularly to an exposure system that enables the production of a sensitometric control patch and the measurement of the sensitometric characteristics of the photographic element. The exposure system comprises a light energy source servo connected to a management module of the exposure parameters. The exposure system enables the production on the exposed film strip of the unique sensitometric control patch, so that this sensitometric control patch includes gradient of exposure areas that enables all the sensitometric characteristics of the photographic film to be obtained.

Abstract: The present invention is in the photographic field, and is used to measure sensitometric characteristics of a photographic element. The present invention relates more particularly to a method that enables the production of a sensitometric control patch with exposure gradient, placed on a photographic element, and enables the measurement of the sensitometric characteristics of the photographic element. The sensitometric control patch is produced so as to obtain on the exposed photographic film strip, a single sensitometric control comprising a gradient of exposure areas, and enables all the sensitometric characteristics of the film to be obtained. The sensitometric control patch is produced from the nominal sensitometric characteristics of the film, and the instantaneous speed of relative movement of the film in front of the light energy source. The present invention has its application in the photography field and in particular the motion picture field.

Abstract: The invention relates to a method to establish a sensitometry curve for a photographic medium, including the following steps: the formation on the medium of at least one sensitometry control by exposing many ranges of the medium with various exposure energies; the capture of the optical density values of the sensitometry control in each range; the formation from the captured values of sensitometry curve sections; and the energy offset of the curve section to obtain a partial overlap of sections corresponding to neighboring exposure energies.

Abstract: The invention relates to a method to establish a sensitometry curve for a photographic medium, including the following steps: the formation on the medium of at least one sensitometry control by exposing many ranges of the medium with various exposure energies; the capture of the optical density values of the sensitometry control in each range; the formation from the captured values of sensitometry curve sections; and the energy offset of the curve section to obtain a partial overlap of sections corresponding to neighboring exposure energies.

Abstract: The present invention is in the field of photography and is used to measure the sensitometric characteristics of a photographic element, such as a photographic film strip. The present invention relates more particularly to an exposure system that enables the production of a sensitometric control patch and the measurement of the sensitometric characteristics of the photographic element. The exposure system comprises a light energy source servo connected to a management module of the exposure parameters. The exposure system enables the production on the exposed film strip of the unique sensitometric control patch, so that this sensitometric control patch includes gradient of exposure areas that enables all the sensitometric characteristics of the photographic film to be obtained.

Abstract: The present invention is in the photographic field, and is used to measure sensitometric characteristics of a photographic element. The present invention relates more particularly to a method that enables the production of a sensitometric control patch with exposure gradient, placed on a photographic element, and enables the measurement of the sensitometric characteristics of the photographic element. The sensitometric control patch is produced so as to obtain on the exposed photographic film strip, a single sensitometric control comprising a gradient of exposure areas, and enables all the sensitometric characteristics of the film to be obtained. The sensitometric control patch is produced from the nominal sensitometric characteristics of the film, and the instantaneous speed of relative movement of the film in front of the light energy source. The present invention has its application in the photography field and in particular the motion picture field.

Abstract: The present invention is in the technical field of image digitizers or scanners. It relates to a method and device that enables the automatic calibration of digitizing equipment. The method and device of the invention enable the auto-calibration of a digitizing device by taking into account sensitometric data specific to a film strip to be digitized, to automatically adjust the digitizing parameters of the digitizing device, according to these sensitometric data and without operator intervention. The application field of the invention more especially relates to the users of digitizing equipment dedicated to motion picture films.