Multi-half-tone imaging and dual modulation projection/dual modulation laser projection
AssigneeDolby Laboratories Licensing Corporation
InventorsMartin J. Richards, Jerome Shields
Life of this patent
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Abstract
Smaller halftone tiles are implemented on a first modulator of a dual modulation projection system. This techniques uses multiple halftones per frame in the pre-modulator synchronized with a modified bit sequence in the primary modulator to effectively increase the number of levels provided by a given tile size in the halftone modulator. It addresses the issue of reduced contrast ratio at low light levels for small tile sizes and allows the use of smaller PSFs which reduce halo artifacts in the projected image and may be utilized in 3D projecting and viewing.
Claims7
A method for dual-modulation display, comprising:
- identifying a Point Spread Function (PSF) of a set of relay optics, the PSF encoding non-uniformities in light transmitted through the relay optics from a pre-modulator to a primary modulator;
- generating a Fourier Transform of the PSF of the relay optics;
- determining a desired PSF and a Fourier Transform of the desired PSF for the primary modulator;
- calculating a correction factor as a function of the Fourier Transforms of both the desired PSF and the PSF of the relay optics;
- generating an inverse Fourier Transform of the correction factor;
- applying the inverse Fourier Transform of the correction factor to input image data to the pre-modulator.
Dependencies are inferred from the claim text.