Image processing apparatus
US6701024B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 1, 2000 |
| Grant date | Mar 2, 2004 |
| Priority date | — |
| Expiry date | Mar 25, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T5/73
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image processing apparatus for calculating a new luminance value of a central pixel to adjust the spatial frequency characteristics of an input image includes a plurality of subfilters, totalizer, and adder. The subfilters are arranged in parallel with each other for a plurality of pixel groups each made up of one or more pixels in a submatrix. The subfilters multiply the sums of the luminance values of pixels included in corresponding pixel groups by predetermined coefficients corresponding to desired spatial frequency adjustment filter characteristics, and output the products for each submatrix made up of M×M (M is an odd number of 3 or more) pixels centered on pixels constituting an input image for a two-dimensional input image made up of many pixels that are arrayed in a matrix and represent luminance values at positions. The totalizer totals outputs from the subfilters, and outputs the sum as the adjustment amount of the spatial frequency characteristics. The adder adds the adjustment amount obtained by the totalizer to the original luminance value of the central pixel, and outputs the sum as a new luminance value of the central pixel for each matrix.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.