Illusion analyzing apparatus, apparatus for generating illusion-considered image for which illusion is taken into consideration to allow perception according to original image, illusion analyzing method, method of generating illusion-considered image for which illusion is taken into consideration to allow perception according to original image, and program

An illusion-considered image generating apparatus comprising at least a storage unit and a control unit,

• the storage unit comprising:
• a filter storage unit that stores a wavelet frame with orientation selectivity or a filter bank with orientation selectivity that is a set of an approximate filter with no orientation and a plurality of detail filters with respective orientations;
• and
• an image data storage unit that stores image data;
• and the control unit comprising:
• a decomposing unit that performs multiresolution decomposition on the image data by using the wavelet frame with orientation selectivity or the filter bank with orientation selectivity and obtains subband signals;
• and
• a reconstructing unit that reconstructs an image by summing the subband signals that are obtained by the decomposing unit and obtains reconstructed image data;
• and
• the decomposing unit further including a coefficient processing unit that performs, between a decomposition phase and a synthesis phase in the multiresolution decomposition, coefficient processing on decomposition detail coefficients that are output from the decomposition phase such that the larger the energy of the decomposition detail coefficients is, the more small values are increased, and the smaller the energy of the decomposition detail coefficients is, the more small values are further reduced.

An illusion analyzing method performed by an illusion analyzing apparatus comprising at least a storage unit and a control unit,

• the storage unit comprising:
• a filter storage unit that stores a wavelet frame with orientation selectivity or a filter bank with orientation selectivity that is a set of an approximate filter with no orientation and a plurality of detail filters with respective orientations;
• and
• an image data storage unit that stores image data;
• and
• the illusion analyzing method being performed by the control unit, the illusion analyzing method comprising:
• a decomposing step of performing multiresolution decomposition on a color component of the image data by using the wavelet frame with orientation selectivity or the filter bank with orientation selectivity and obtaining subband signals;
• a reconstructing step of reconstructing an image by summing the subband signals that are obtained at the decomposing step and obtaining reconstructed image data;
• and
• an illusion quantifying step of quantifying an amount of illusion by calculating a ratio or difference in the color component between the image data and the reconstructed image data;
• and
• the decomposing step further including a coefficient processing step of performing, between a decomposition phase and a synthesis phase in the multiresolution decomposition, coefficient processing on decomposition detail coefficients that are output from the decomposition phase such that the larger the energy of the decomposition detail coefficients is, the more small values are further reduced, and the smaller the energy of the decomposition detail coefficients is, the more small values are increased, wherein
• the coefficient processing step includes performing, in a color space including lightness and color like human color-perception, for color components of color of the image data, the coefficient processing that is corrected such that the larger the energy that is determined from the decomposition detail coefficients of color and the decomposition detail coefficients of lightness is, the more small values are further reduced, and the smaller the energy is, the more small values are increased.

An illusion-considered image generating method performed by an illusion-considered image generating apparatus comprising at least a storage unit and a control unit,

• the storage unit comprising:
• a filter storage unit that stores a wavelet frame with orientation selectivity or a filter bank with orientation selectivity that is a set of an approximate filter with no orientation and a plurality of detail filters with respective orientations;
• and
• an image data storage unit that stores image data;
• and
• the illusion-considered image generating method being performed by the control unit, the illusion-considered image generating method comprising:
• a decomposing step of performing multiresolution decomposition on the image data by using the wavelet frame with orientation selectivity or the filter bank with orientation selectivity and obtaining subband signals;
• and
• a reconstructing step of reconstructing an image by summing the subband signals that are obtained at the decomposing step and obtaining reconstructed image data;
• and
• the decomposing step further including a coefficient processing step of performing, between a decomposition phase and a synthesis phase in the multiresolution decomposition, coefficient processing on decomposition detail coefficients that are output from the decomposition phase such that the larger the energy of the decomposition detail coefficients is, the more small values are increased, and the smaller the energy of the decomposition detail coefficients is, the more small values are further reduced.

A non-transitory computer-readable medium comprising computer-readable program codes, performed by an illusion analyzing apparatus comprising at least a storage unit and a control unit,

• the storage unit comprising:
• a filter storage unit that stores a wavelet frame with orientation selectivity or a filter bank with orientation selectivity that is a set of an approximate filter with no orientation and a plurality of detail filters with respective orientations;
• and
• an image data storage unit that stores image data;
• and
• the program codes when executed causing the control unit to execute:
• a decomposing step of performing multiresolution decomposition on a color component of the image data by using the wavelet frame with orientation selectivity or the filter bank with orientation selectivity and obtaining subband signals;
• a reconstructing step of reconstructing an image by summing the subband signals that are obtained at the decomposing step and obtaining reconstructed image data;
• and
• an illusion quantifying step of quantifying an amount of illusion by calculating a ratio or difference in the color component between the image data and the reconstructed image data;
• and
• the decomposing step further including a coefficient processing step of performing, between a decomposition phase and a synthesis phase in the multiresolution decomposition, coefficient processing on decomposition detail coefficients that are output from the decomposition phase such that the larger the energy of the decomposition detail coefficients is, the more small values are further reduced, and the smaller the energy of the decomposition detail coefficients is, the more small values are increased, wherein
• the coefficient processing step includes performing, in a color space including lightness and color like human color-perception, for color components of color of the image data, the coefficient processing that is corrected such that the larger the energy that is determined from the decomposition detail coefficients of color and the decomposition detail coefficients of lightness is, the more small values are further reduced, and the smaller the energy is, the more small values are increased.

A non-transitory computer-readable medium comprising computer-readable program codes, performed by an illusion-considered image generating apparatus comprising at least a storage unit and a control unit,

• the storage unit comprising:
• a filter storage unit that stores a wavelet frame with orientation selectivity or a filter bank with orientation selectivity that is a set of an approximate filter with no orientation and a plurality of detail filters with respective orientations;
• and
• an image data storage unit that stores image data;
• and
• the program codes when executed causing the control unit to execute:
• a decomposing step of performing multiresolution decomposition on the image data by using the wavelet frame with orientation selectivity or the filter bank with orientation selectivity and obtaining subband signals;
• and
• a reconstructing step of reconstructing an image by summing the subband signals that are obtained at the decomposing step and obtaining reconstructed image data;
• and
• the decomposing step further including a coefficient processing step of performing, between a decomposition phase and a synthesis phase in the multiresolution decomposition, coefficient processing on decomposition detail coefficients that are output from the decomposition phase such that the larger the energy of the decomposition detail coefficients is, the more small values are increased, and the smaller the energy of the decomposition detail coefficients is, the more small values are further reduced.