Reducing ghosting in holographic stereograms
AssigneesSony Electronics (Singapore) Pte, Ltd., Sony Corporation
InventorsChao Hsu Lee, Akira Shirakura
Life of this patent
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Abstract
A plurality of source data frames is input into a processor. The plurality of source data frames is sectioned into a plurality of sections which are mapped to form a plurality of pre-distort images. The plurality of pre-distort images is compensated for variations in the degree of saturation (Diffraction Efficiency) to reduce ghosting and compressed to form a plurality of holographic elements, which are recorded onto a holographic recording medium to form a holographic stereogram.
Claims37
A method for forming a holographic stereogram from a plurality of source data frames, the method comprising:
- sectioning a plurality of source data frames into a plurality of sections;
- mapping the plurality of sections to form a plurality of pre-distort images;
- compensating the plurality of pre-distort images for variations in saturation;
- compressing the plurality of pre-distort images to form a plurality of holographic elements;
- and
- recording the plurality of holographic elements onto a holographic recording medium to form the holographic stereogram.
A method of generating a reference relationship between an averaged pixel value in a pre-distort image of a plurality of pre-distort images and the predicted brightness of pixels in an image generated from a holographic stereogram generated from the plurality of pre-distort images, the method comprising:
- (a) generating a series of reference source data frames having colour gradation;
- (b) sectioning and mapping each of the series of reference source data frames to form a set of reference pre-distort images;
- (c) compressing the set of reference pre-distort images to form a set of reference holographic elements;
- (d) recording the set of reference holographic elements onto a holographic recording medium to form a reference holographic stereogram;
- (e) measuring the brightness of an image reproduced from the reference holographic stereogram;
- and
- (f) plotting a graph of an averaged pixel value of a pixel in the set of reference pre-distort images against the brightness of the image reproduced from the reference holographic stereogram.
A method of establishing a weighting factor relationship between a weighting factor of one colour component in a pixel against an averaged pixel value of colour components for the pixel in a pre-distort image, the method comprising:
- generating, using a processor, a first set of weighting factor reference source data frames
- obtaining an image from a stereographic hologram derived from the weighting factor reference source data frames;
- generating a reference ratio from a reference section in the image;
- generating further ratios for other sections in the image;
- dividing each of the further ratios by the reference ratio to obtain a co-ordinate along a weighting factor axis;
- and
- plotting a plurality of points, each represented by one co-ordinate along the weighting factor axis and one co-ordinate along each averaged pixel value axis of the other colour components in the pixel used to generate the relevant further ratio, to form the graph.
A method of establishing a weighting factor relationship between a weighting factor of one colour component in a pixel against an averaged pixel value of colour components for the pixel in a pre-distort image, the method comprising:
- (a) generating a first set of weighting factor reference source data frames of different colour components;
- (b) obtaining an image from a stereographic hologram derived from the first set of weighting factor reference source data frames;
- (c) generating a reference ratio from a reference section in the image;
- (d) generating a further ratio for another sections in the image;
- (e) dividing the further ratio by the reference ratio to obtain a co-ordinate along a weighting factor axis;
- (f) plotting a point, represented by one co-ordinate along the weighting factor axis and one co-ordinate along each averaged pixel value axis of the other colour components in the pixel;
- and
- (g) repeating steps (a), (b) and (d) to (f) for one or more further sets of reference source data frames.
A method for use in reducing ghosting in holographic stereograms, wherein a plurality of source data frames are sectioned and the resulting sections mapped to form a plurality of pre-distort images, the method comprising:
- compensating the plurality of pre-distort images for variations in saturation.
A method of altering pre-distort images for forming a holographic stereogram from a plurality of source data frames, the pre-distort images having been provided by sectioning the source data frames into a plurality of sections and mapping the plurality of sections to form a plurality of pre-distort images, the method comprising:
- compensating the plurality of pre-distort images for variations in saturation.
A method for use in producing a holographic stereogram on a recording medium with reduced ghosting, comprising pre-compensating for non-linear characteristics of the recording medium.
Apparatus for forming a holographic stereogram from a plurality of source data frames, comprising:
- means for sectioning a plurality of source data frames into a plurality of sections;
- means for mapping the plurality of sections to form a plurality of pre-distort images;
- and
- means for applying a compensation algorithm to one or more pixels in the plurality of pre-distort images to compensate for variations in saturation.
A computer system for forming a holographic stereogram from a plurality of source data frames, the computer system comprising:
- an external device interface for receiving the plurality of source data frames;
- a processor coupled to the external device interface, operable to section and map the plurality of source data frames to form a plurality of pre-distort images;
- and
- a memory coupled to the processor, wherein the memory stores a compensation algorithm for applying to one or more pixels in the plurality of pre-distort images to compensate for variations in saturation.
A computer-readable medium for storing a computer readable program for forming a holographic stereogram from a plurality of source data frames, said program comprising:
- sectioning and mapping the plurality of source data frames to form a plurality of pre-distort images;
- and
- applying a compensation algorithm to one or more pixels in the plurality of pre-distort images to compensate for variations in saturation.
Dependencies are inferred from the claim text.