5 papers · 1 filter
Transport of Event Equation: Phase Retrieval from Defocus Events
Kaito Hori, Chihiro Tsutake, Keita Takahashi +1
To time-efficiently and stably acquire the intensity information for phase retrieval under a coherent illumination, we leverage an event-based vision sensor (EVS) that can detect c…
Events Meet Phase-Shifting Digital Holography: Practical Acquisition, Theory, and Algorithms
Ittetsu Uchiyama, Chihiro Tsutake, Keita Takahashi +1
We introduce a novel phase-shifting digital holography (PSDH) method leveraging a hybrid event-based vision sensor (EVS). The key idea of our method is the phase shift during a sin…
Fast Sign Retrieval via Sub-band Convolution: An Elementary Extension of Binary Classification
Fuma Ito, Chihiro Tsutake, Keita Takahashi +1
To efficiently compress the sign information of images, we address a sign retrieval problem for the block-wise discrete cosine transformation (DCT): reconstruction of the signs of…
An Efficient Compression Method for Sign Information of DCT Coefficients via Sign Retrieval
Chihiro Tsutake, Keita Takahashi, Toshiaki Fujii
Compression of the sign information of discrete cosine transform coefficients is an intractable problem in image compression schemes due to the equiprobable occurrence of the sign…
Holographic Phase Retrieval via Wirtinger Flow: Cartesian Form with Auxiliary Amplitude
Ittetsu Uchiyama, Chihiro Tsutake, Keita Takahashi +1
We propose a new gradient method for holography, where a phase-only hologram is parameterized by not only the phase but also amplitude. The key idea of our approach is the formulat…