Methods and apparatus for displaying images using holograms

A method of generating data for displaying an image defined by displayed image data using a plurality of holographically generated temporal subframes, said temporal subframes being displayed sequentially in time such that they are perceived as a single noise-reduced image, the method comprising generating from said displayed image data holographic data for each subframe of said set of subframes such that successive replay of holograms defined by said holographic data for said subframes gives the appearance of said image, and wherein the method further comprises, when generating said holographic data for a subframe, compensating for noise in said displayed image arising from one or more previous subframes of said sequence of holographically generated subframes;

• wherein generating of said holographic data from said displayed image data for each subframe of said set of subframes comprises:
• substantially randomising a phase component of data derived from said displayed image data from which said holographic subframe data is to be generated;
• transforming said randomised data from a spatial domain into a frequency domain;
• and
• quantising said transformed data.

A hardware image display system for displaying an image defined by displayed image data using a plurality of holographically generated temporal subframes, said temporal subframes being displayed sequentially in time such that they are perceived as a single noise-reduced image, by generating from said displayed image data holographic data for each subframe of said set of subframes such that successive replay of holograms defined by said holographic data for said subframes gives the appearance of said image, the system comprising:

• an input for said displayed image data;
• a space-frequency transform system having an input coupled to said displayed image data input and having an output, for performing a 2D space-frequency transform of data derived from said displayed image data;
• a holographic image data output coupled to said space-frequency transform system output;
• and
• a frequency-space transform system having an input coupled to said holographic image data output, and having an output, for performing a 2D frequency-space transform of data derived from said holographic subframe data;
• and
• a noise reduction system coupled between said displayed image data input and said space-frequency transform system input and to said frequency-space transform system output for adjusting said displayed image data using holographic subframe data for a subframe prior to generation of subframe data for a subsequent subframe.

A hardware image display system for displaying an image defined by displayed image data using a plurality of holographically generated temporal subframes, said temporal subframes being displayed sequentially in time such that they are perceived as a single noise-reduced image, by generating from said displayed image data holographic data for each subframe of said set of subframes such that successive replay of holograms defined by said holographic data for said subframes gives the appearance of said image, the system comprising:

• an input for said displayed image data;
• space-frequency transform circuitry having an input coupled to said displayed image data input and having an output, for performing a 2D space-frequency transform of data derived from said displayed image data;
• a holographic image data output coupled to said space-frequency transform circuitry output;
• and
• frequency-space transform circuitry having an input coupled to said holographic image data output, and having an output, for performing a 2D frequency-space transform of data derived from said holographic subframe data;
• and
• noise reduction circuitry coupled between said displayed image data input and said space-frequency transform circuitry input and to said frequency-space transform circuitry output for adjusting said displayed image data using holographic subframe data for a subframe prior to generation of subframe data for a subsequent subframe.

A hardware image display system for displaying an image defined by displayed image data using a plurality of holographically generated temporal subframes, said temporal subframes being displayed sequentially in time such that they are perceived as a single noise-reduced image, by generating from said displayed image data holographic data for each subframe of said set of subframes such that successive replay of holograms defined by said holographic data for said subframes gives the appearance of said image, the system comprising:

• an input for said displayed image data;
• space-frequency transform code having an input coupled to said displayed image data input and having an output, for performing a 2D space-frequency transform of data derived from said displayed image data;
• a holographic image data output coupled to said space-frequency transform code output;
• and
• frequency-space transform code having an input coupled to said holographic image data output, and having an output, for performing a 2D frequency-space transform of data derived from said holographic subframe data;
• noise reduction code coupled between said displayed image data input and said space-frequency transform code input and to said frequency-space transform code output for adjusting said displayed image data using holographic subframe data for a subframe prior to generation of subframe data for a subsequent subframe;
• a program memory storing the space-frequency transform code, the frequency-space transform code, and the noise reduction code;
• and
• a processor coupled to the program memory and configured to execute the space-frequency transform code, the frequency-space transform code, and the noise reduction code.