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US 7,003,037 B1Granted
Process, device and use for evaluating coded images
AssigneeThomson Licensing
InventorsPhilippe Bordes, Philippe Guillotel
Life of this patent
Estimating the term…
Abstract
A process for evaluating the quality of coded images (e.g., two video sequences) uses a homogeneous motion vector field and psychovisual filtering to take into account Human Visual System (HVS) characteristics to calculate the error between the two video sequences.
Claims32
A method for evaluating the quality of coded images, the method comprising:
- a) processing a signal representative of an image so as to obtain a processed signal,
- b) constructing, a motion vector field by estimating motion between image sequences in the signal representative of the image to get velocity vectors,
- c) segmenting the motion vector field according to a motion value of the velocity vectors to get regions,
- d) determining a psychovisual human filter to be applied as a function of an estimated velocity of each region,
- e) psychovisual filtering the processed signal, and
- f) constructing a map of disparities between the signals representative of the image which are obtained after the psychovisual filtering step and signals representative of a decoded image which are obtained after the psychovisual filtering step.
3 more elements
A device for evaluating the quality of coded images, the device comprising:
- means for processing a signal representative of a source image and of a decoded image so as to obtain a processed source image signal and a processed decoded image signal,
- means for constructing on the basis of the signal representative of each of the images, a signal representative of the estimating of the field of motion on the basis of each of the images of the source and decoded sequences,
- means for building a signal representative of the segmenting of the field of motion and of storing the image pixels representative of each region Ri having a different field of motion at an address defined with respect to the velocity vectors estimated in the step of constructing the field of motion making it possible to determine for each of the source and decoded images those having different velocity vectors,
- a means for determining a psychovisual human filter to be applied as a function of the estimated velocity of the region,
- means for psychovisual filtering applied to each of the processed source images and processed decoded images and
- means for constructing a map of disparities between the signals representative of the processed source image which are obtained after the filtering and the signals representative of the processed decoded image which are obtained after the filtering.
3 more elements
Dependencies are inferred from the claim text.