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La Poste

Laboratoire Central Des Ponts Et Chaussees

L'institut De Recherche Et D'enseignement Superieur Aux Techniques De

Dominique Barba

Olivier Le Meur

Patrick Le Callet

Dominique Thoreau

Alexandre Ninassi

Christian Viard-Gaudin

Edouard Francois

Philippe Salmon

Philippe Delagnes

Oiry Herve

Nicotra Herve

Elisabeth Capitaine

Herve Oiry

Herve Nicotra

Oliver Le Meur

A method for assessing the quality of a distorted version of a frame sequence includes the steps of determining a last spatial distortion by comparing a block of a last frame (I) of the sequence with a corresponding block of the distorted version of the last frame, determining, in a last-but-one frame, a best-matching block matching said block of the last frame best, determining a last-but-one spatial distortion by comparing the determined best-matching block of the last-but-one frame with a corresponding block of the distorted version of the last-but-one frame, determining a spatio-temporal perceptual distortion value associated with said block using said determined distortions and using the determined spatio-temporal perceptual distortion value for assessing the quality.

Method for assessing the quality of a distorted version of a frame sequence

Detection of the salient points in an image enable the improvement of further steps such as coding or image indexing, watermarking, video quality estimation. The methods rely on the fact that a model is fully based on the human visual system (HVS) such as the computation of early visual features, and the methods compute a saliency map for video images taking into account motion and the velocity of the eye.

Device and method for creating a saliency map of an image

A method of obtaining a saliency map from a plurality of saliency maps created from different visual quantities. Initially the saliency maps are normalized based on a theoretical maximum of each visual quantity. An intra-competition step selects the main saliency areas in each saliency map. An inter-competition step is then performed based on a sum of the intra-map competition with an inter-map redundancy term that is a function of the product of the intra-map competitions and of the probability of a site appearing on the saliency maps.

Method of obtaining a saliency map from a plurality of saliency maps created from visual quantities

A method for assessing image quality between a reference image and an impaired image is disclosed. The method comprises the steps of The subband decomposition is based on a wavelet transform adapted to decompose each of the luminance components into L levels of decomposition, with L a positive integer determined as a function of the image height and of the distance of visualization.

Method for assessing image quality

The invention is a method for assessing image quality value of a distorted image with respect to a reference image. The method comprises the following steps:

The invention concerns a device and a method for creating a saliency map of an image. It comprises the steps of:

A process for detecting defects in a textured suface, particularly on a highway. The process consists in displacing with respect to the surface a camera presenting an inclination and in processing by processing systems the successive images taken by the camera. A mathematical processing is effected on sub-images, corresponding to the same spatial portion of the surface, taken at different consecutive instants.

Process for detecting surface defects on a textured surface

Device for controlling and regulating the spacing of parcels, packages or similar objects and, more particularly, of postal parcels, mounted at the outlet of a separation apparatus that includes a truncated cone-shaped rotating drum with its axis inclined towards the horizontal and having internal helical fins designed to deliver the packages one by one to the outlet of the drum. The device further includes a conveyor belt driven at constant speed and onto which the packages are tipped at the outlet of the drum, a barrier of detection cells, the beam of which extends in perpendicular to the line of travel of the conveyor in order to identify the moment of each package's passage into this beam and to measure, between two successive interruptions of the cells, the relative spacing of two consecutive packages intersecting, each in turn, the beam of the cells. The device further includes at least one instantaneous photographic camera to obtain an image illustrating the distribution in real time of the packages on the conveyor, a digital-processing circuit to process the image supplied by the camera to identify any superimposition or juxtaposition of two packages which have escaped detection by the cells, and a deviator mechanism actuated by the processing circuit to remove from the conveyor those packages which are not suitably spaced.

Device for controlling and regularizing the spacing objects such as

Control device for a flow of objects in continuous file and, more particularly, of postal parcels or packages, prior to their introduction into a separator mechanism which imposes at its oulet a suitable spacing between one object and the next, which comprises a first conveyor belt on which the objects are disposed in bulk, this conveyor travelling at a variable linear speed (V1), a second conveyor belt, disposed following the first and driven at a similarly variable linear speed (V2), a photographic camera for the acquisition in real time of an image of the second conveyor and of the packages transported by it, presenting according to the length of the conveyor a given longitudinal dimension (L), a processing circuit for the image received from the camera in order to discern within this image the number of packages (Nc) which it contains, a computer for controlling the instantaneous speeds (V1 and V2) of the two conveyors during the transfer of the packages disposed on the second conveyor according to the dimension (L), this speed (V2) being chosen such that the throughput of the packages delivered by the second conveyor to the entrance of the separator mechanism is constantly equal to a predetermined target value (D), and an incremental coder for triggering the acquisitions of images by the camea.

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Carquefou, France

Dominique Barba