Device and method for creating a saliency map of an image
View Patent ↗The invention concerns a device and a method for creating a saliency map of an image. It comprises the steps of: Projection of said image according to the luminance component and if said image is a color image, according to the luminance component and according to the chrominance components, Perceptual sub-bands decomposition of said components according to the visibility threshold of a human eye, Extraction of the salient elements of the sub-bands related to the luminance component, Contour enhancement of said salient elements in each sub-band related to the luminance component, Calculation of a saliency map from the contour enhancement, for each sub-band related to the luminance component. Creation of the saliency map as a function of the saliency maps obtained for each sub-band.
1. In a computer device, a method for creating a saliency map of an image wherein it comprises the steps of:
Projection of said image according to the luminance component and if said image is a color image, according to the luminance component and according to the chrominance components,
Perceptual sub-bands decomposition, by the computer device, of said components according to the visibility threshold of a human eye,
Extraction of the salient elements of the sub-bands related to the luminance component,
Contour enhancement of said salient elements in each sub-band related to the luminance component,
Calculation, by the computer device, of a saliency map from the contour enhancement, for each sub-band related to the luminance component,
Creation of the saliency map as a function of the saliency maps obtained for each sub-band.
2. Method according to claim 1 wherein it comprises, further to the perceptual sub-bands decomposition by the computer device,
a step of achromatic contrast sensitivity function for the luminance component and if said image is a color image,
a step of chromatic sensitivity function for the chromatic components.
3. Method according to claim 2 wherein it comprises a step of visual masking, further to the step of contrast sensitivity function, for each sub-band of the luminance component and of the chromatic components.
4. Method according to claim 3 wherein, when said image is a color image, it comprises a step of chromatic reinforcement of the luminance sub-bands.
5. Method according to claim 1 wherein the perceptual sub-bands decomposition, by the computer, is obtained by carving-up the frequency domain both in spatial radial frequency and orientation.
6. Method according to claim 5 wherein the perceptual decomposition of the luminance component leads to 17 psycho visual sub-bands distributed on four crowns.
7. Method according to claim 5 wherein the perceptual decomposition of the chromatic components leads to 5 psycho visual sub-bands distributed on two crowns for each chromatic component.
8. Method according to claim 4 wherein the chromatic reinforcement of the luminance component is done on the sub-bands of the second crown and based on the sub-bands of the first crown of the chromatic components.
9. A computer readable medium encoded with a computer program, that when executed by a computer devices comprises the steps of:
Projection of said image according to the luminance component and if said image is a color image, according to the luminance component and according to the chrominance components,
Perceptual sub-bands decomposition, by the computer device of said components according to the visibility threshold of a human eye,
Extraction of the salient elements of the sub-bands related to the luminance component,
Contour enhancement of said salient elements in each sub-band related to the luminance component,
Calculation, by the computer device, of a saliency map from the contour enhancement, for each sub-band related to the luminance component,
Creation of the saliency map as a function of the saliency maps obtained for each sub-band.