Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

Commissariat a L'energie Atomique

Trixell

Arnaud Verdant

William Guicquero

Antoine Dupret

Gilles Sicard

Timothé Laforest

Camille Dupoiron

Marc Arques

Dominique Morche

Jean-Pierre Rostaing

Pierre Joly

Sylvain Gigan

Gilles Tessier

Michael Tchagaspanian

Laurent Millet

Benoît Racine

Mohammed-Saad Boutayeb

François Ramaz

Mohammed Saad Boutayeb

Michaël Tchgaspanian

A multichannel transmit and/or receive system, each channel includes a DAC and a sigma-delta modulator the transfer function of which is expressed thus:OUT()=IN()·()+()·(),where OUT is the output signal of the sigma-delta modulator, IN is the input signal of the sigma-delta modulator, FTS is the transfer function of the input signal, Q is the quantization noise and FTB is the transfer function of the quantization noise, the second terms of the transfer function of the sigma-delta modulator only being distinct from one another for two channels Vi, Vj, in order to decorrelate the quantization noise of distinct channels, the first term of said transfer function for channel Vi being equal to the first term of said transfer function for channel Vj.

Multichannel transmit and/or receive system comprising at least N parallel processing channels and method for decorrelating quantization noise in such a system

The present disclosure relates to a method of performing, by an image processing circuit, an inference operation comprising: capturing first and second images using first and second values respectively of an image capture parameter; generating, for a first region of the first and second images, first and second estimates respectively of an image quality metric, wherein the image quality metric is dependent on the value of the image capture parameter; calculating first and second distances between the first and second estimates respectively and first and second target levels respectively; and supplying a result of the inference operation performed on the first region of either the first or second image selected based on the first and second distances.

Image processing for on-chip inference

A device for modulating the phase of a light beam includes a matrix of elementary cells, called pixels, coupled to a circuit for addressing the pixels, the device further comprising a set of so-called lateral electrodes extending in a so-called vertical direction (Y) at right angles to the alignment direction (Xa) and configured to apply, for each pixel and via at least two lateral electrodes, a so-called acceleration voltage generating a lateral electrical field (Era) substantially parallel to the alignment direction, in a vector allowing an accelerated return of the liquid crystal molecules to their orientation of rest, the acceleration voltage being configured to be applied in a phase called acceleration relaxation phase, when the activation voltage is no longer applied.

Liquid crystal phase modulation device

The present description relates to a comparator () comprising a ring of gates (A,B,A',B&#x2032;,) in series, wherein: each gate implements an inverting function between a first input () and an output () of the gate; at least one (A&#x2032;,B&#x2032;) gate is controllable and is associated with another gate; each controllable gate (A&#x2032;,B&#x2032;) comprises a control input () coupled with the output () of said associated gate, and prevents switching of its output () to a high state if its control input () is in the high state, and to a low state otherwise; and the control input () of each controllable gate (A&#x2032;,B&#x2032;) receives the output () of said associated gate if an even number of gates separates these two gates, and receives the complement of said output if not.

Dynamic comparator

The present invention relates to a scene descriptor generation system, including an image sensor including a plurality of pixels, successively supplying S binary image planes, each including a single binary value per pixel; and a processing circuit configured to, for each binary image plane supplied by the sensor (), to implement the successive steps of: a) calculating N convolutions of the binary image plane with respectively N distinct convolution kernels, to provide N convolved images; b) generating at least one meta-image from the N convolved images supplied at step a); and c) for each of the N convolved images supplied at step a), generating a binary descriptor from said convolved image and from said at least one meta-image.

Scene descriptor generation system and method

The present description concerns a comparator () of a first voltage (V+) and of a second voltage (V&#x2212;), comprising first () and second () branches each comprising a same succession of alternated first () and second () gates in series between a node () and an output () of the branch (), wherein: each branch starts with a first gate (), each gate () has a second node () receiving a bias voltage, the second node () of each first gate () of the first branch () and of each second gate () of the second branch () receives the first voltage (V+), the second node of the other gates receiving the second voltage (V&#x2212;), and an order of arrival of the edges on the outputs () of the branches determines a result of a comparison.

The present invention relates to an imaging system, including: a coherent light source delivering an object beam and a reference beam; a device of modulation of the object beam with a modulation signal; an image sensor arranged to receive an interference pattern resulting from a combination of the object beam and of the reference beam; and a demodulation device, the system being configured to, during a measurement phase: apply to the modulation signal a first pseudo-random sequence of jumps of a parameter selected among the phase, the frequency, and the amplitude; and simultaneously apply to the modulated portion of the object beam a second pseudo-random sequence of jumps of said parameter, wherein the first and second sequences of jumps of said parameter are non-correlated.

Acoustic-optical imaging system

The present disclosure concerns a sensor for the acquisition of an optical signal modulated at an acoustic frequency, including a plurality of pixels, each including: a photodiode; an integration circuit configured to, at each period of the modulated optical signal, integrate a photocurrent delivered by the photodiode successively into K capacitors, K being an integer greater than or equal to 2; and a phase detection circuit configured to detect an order in the crossing of a predetermined voltage threshold by the K capacitors and to generate, according to the detected order, a signal representative of the phase of the modulated optical signal.

Sensor for the acquisition of an optical signal modulated at an acoustic frequency

A method of processing an image including pixels distributed in cells and in blocks is disclosed, the method including the steps of: a) for each cell, generating n first intensity values of gradients having different orientations, each first value being a weighted sum of the values of the pixels of the cell; b) for each cell, determining a main gradient orientation of the cell and a second value representative of the intensity of the gradient in the main orientation; c) for each block, generating a descriptor of n values respectively corresponding, for each of the n gradient orientations, to the sum of the second values of the cells of the block having the gradient orientation considered as the main gradient orientation.

Image processing method

The invention concerns a method of performing intra-frame and inter-frame image processing comprising: alternating first and second image capture operations, the first image capture operation comprises capturing one or more first images (IA) based on a first set of image capture parameters (PA) and the second image capture operation comprises capturing one or more second images (IB) based on a second set of image capture parameters (PB), the values of the parameters of the first set being modified between each of the first image capture operations and the values of the parameters of the second set remaining constant between each of the second image capture operations or varying by less than a significant amount.

Method of inter-frame and intra-frame image processing

An image sensor including: a plurality of pixels, each pixel being capable of supplying an output signal representative of a quantity of light energy received from a time of beginning of a pixel integration phase; and a control circuit configured to, during a phase of acquisition of an image, successively select each pixel a number n of times during a same pixel integration phase, without resetting the pixel between the first and the last selection of the pixel and, for each selection of a pixel, compare the output signal of the pixel with a quantization threshold and read a binary signal representative of the result of the comparison.

Synchronous time code image sensor

A compensated comparator is provided, including a decision stage and a differential stage provided with two transistors connected by their sources, the differential stage being provided with compensation means to compensate the effects of a dispersion of the threshold voltages of the transistors forming the differential stage, the compensation means including first and second capacitors each connected to a gate of one of the two transistors, and being configured to memorize a voltage that is a function of a threshold voltage of the considered transistors.

Compensated comparator

An electronic system including: a sensor () capable of successively supplying n vectors Leach including k values L(j); and an electronic device () for processing on the fly the values measured by the sensor, including: a first stage () capable, each time a vector Lhas been supplied by the sensor, of multiplying the k values L(j) of vector Lby respectively k coefficients b(j), and of supplying a vector Tof k values T(j); a second stage () capable, each time a vector Thas been supplied, of multiplying vector Tby a matrix &#xc3; of k*p coefficients, and of supplying a vector Tof p values T(l); and a third stage () capable of digitally integrating the n vectors Tand of supplying an output vector IT of p values IT(l).

On-the-fly processing of data in an acquisition system

A matrix-array sensor comprises a matrix of detection elements arranged in rows and columns and a readout circuit for each column, the elements of one and the same column linked to the corresponding readout circuit via a bus, each element comprising a sensor, a charge integrator configured to accumulate charge generated by the sensor, a comparator configured to generate a trigger signal when a voltage level across the terminals of this comparator reaches a threshold level, and a bus access logic circuit which is configured to receive, as input, the trigger signal and to attempt to transmit, over the bus, an address of the element in the column, wherein the elements of one and the same column have predetermined bus access priority levels, and wherein the bus access logic circuit of each element is configured: to abandon transmission of the address and reset the charge integrator of the detection element if the bus is pre-empted by an element having a higher priority level; to count the number of attempts made before being able to transmit the address; and to communicate the number to the readout circuit along with the address of the element.

Matrix-array sensor with temporal coding without arbitration

The invention relates to an electronic device for analyzing a scene, including a plurality of pixels () connected to a readout circuit () by a same first conductive track (), wherein: each pixel () is capable of detecting an occurrence of a first event characteristic of the scene and of transmitting an event indication signal on the first conductive track () when it detects an occurrence of the first event; and the readout circuit () is capable of reading from the first conductive track () the event indication signals transmitted by the pixels () and of deducing therefrom characteristics of the scene, without transmitting event acknowledgement signals to the pixels ().

Growing community of inventors

Saint Nazaire les Eymes, France

Arnaud Verdant