公开(公告)号：US12080033B1

公开(公告)日：2024-09-03

申请号：US17509775

申请日：2021-10-25

Applicant: Apple Inc.

Inventor： Sebastian Fluegel

IPC: G06T9/00 ,  H03M7/30 ,  H03M7/40 ,  H04N23/60 ,  H04N23/80 ,  H04N25/47

CPC classification number: G06T9/00 ,  H03M7/3064 ,  H03M7/40 ,  H03M7/6011 ,  H04N23/665 ,  H04N23/80 ,  H04N25/47

Abstract: Systems and methods are disclosed for a hybrid image compression technique. The technique may be used to reduce the size of sparse binary images in a lossless fashion for transmission over a low-bandwidth channel and using less power. In embodiments, a received image is partitioned into pixel blocks. Sequences of empty blocks are encoded as a skip counter that indicates the length of the sequence. Non-empty blocks are encoded using one of several block encoding techniques selected based on the length of the resulting block encoding. In embodiments, a loss report may be included in the compressed data stream if blocks are lost due to buffer overflow. In embodiments, the block skip counter is encoded using a variable length code that maps more common skip values to shorter bit widths. In embodiments, the variable length code may be changed periodically to adapt to the characteristics of recent images.

公开(公告)号：US10908361B2

公开(公告)日：2021-02-02

申请号：US16221523

申请日：2018-12-16

Applicant: APPLE INC.

Inventor： Sebastian Fluegel ,  Andrew J. Sutton ,  Bryce T Bradford ,  Yuval Gerson

IPC: G02B6/35 ,  G02B26/08 ,  G01P15/125

Abstract: An apparatus for driving and position sensing in a comb-drive actuator includes a generator, a driver circuit, sensing circuitry, and signal processing circuitry. The generator is configured to apply a sensing-voltage to a first electrode of the comb-drive actuator. The driver circuit is configured to apply a drive-voltage to a second electrode of the comb-drive actuator, having an opposite polarity relative to the first electrode. The sensing circuitry is configured to measure at the second electrode a sensed-waveform resulting from the sensing-voltage applied to the first electrode. The signal processing circuitry is configured to estimate a position of the first electrode relative to the second electrode based on the sensed-waveform.