US 7,627,169 B2 · Image processing apparatus and method

Abstract

Processing for improving the contrast of an image of interest is executed by an image processing circuit in an X-ray photography apparatus. The image is decomposed into coefficient values of a plurality of frequency bands by a frequency-component decomposition circuit to obtain coefficients of each and every frequency band. A coefficient conversion circuit converts coefficient values with regard to at least one frequency band of the plurality of frequency bands in such a manner that a frequency distribution of coefficient values of every frequency band will become a prescribed frequency distribution. A restoration circuit generates an image using the coefficient values obtained by the conversion performed by the coefficient conversion circuit.

Claims3

Dependent claims

An image processing apparatus comprising:

decomposing means for decomposing image data into component values of a plurality of frequency bands;
converting means for converting the component values in at least one of the plurality of frequency bands;
and
generating means for generating an image based on the component values converted by said converting means,
wherein said converting means converts the component values so that frequency of appearance of the component values comes close to a predetermined constant value within a range where the component values are lower than a predetermined value, by using an odd function polynomial that approximates the appearance of the component values, and distribution of frequency of appearance of component values is substantially flat.

2 more elements

Dependencies are inferred from the claim text.

Image processing apparatus and method

Life of this patent

Image processing apparatus and method

Life of this patent

Abstract

Claims3