Invention Grant
- Patent Title: System and method for improving graphics and other signal results through signal transformation and application of dithering
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Application No.: US15275011Application Date: 2016-09-23
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Publication No.: US10321164B2Publication Date: 2019-06-11
- Inventor: Kenneth I. Greenebaum , Eric L. Dacquay , Ian C. Hendry
- Applicant: Apple Inc.
- Applicant Address: US CA Cupertino
- Assignee: Apple Inc.
- Current Assignee: Apple Inc.
- Current Assignee Address: US CA Cupertino
- Agency: Blank Rome LLP
- Main IPC: H03M13/25
- IPC: H03M13/25 ; H03M13/00 ; H04N19/895 ; G09G3/20 ; H04N19/60 ; H04N19/12 ; H04N19/18 ; H04N19/85 ; G11B20/10 ; G10L19/26 ; G10L19/005 ; H04N1/56 ; G06T3/40 ; G06T3/20 ; H04B1/7085 ; H04N1/58 ; H04N19/124 ; H04N19/36

Abstract:
Systems, methods, and computer readable media are described for effectively using dither techniques upon signals having a predicted quantization error that varies across the range of the signal. In some embodiments, predicted error is used to shape a precision input signal so that the newly-shaped signal yields a uniform or relatively uniform predicted quantization error. A dither is applied to the re-shaped signal, and the shaping is reversed, after which the signal may be slope limited and/or quantized, taking full and efficient advantage of the dithering technique.
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