Image Contrast and Sharpness Enhancement

Image enhancing device with

• first filter means arranged for splitting an image into at least three sub-images, wherein each of the sub-images represents a corresponding spatial frequency range of the image,
• first combination means arranged for calculating a pixel detail signal for at least one of the sub-images, depending on at least a pixel detail signal of another frequency range,
• second combination means arranged for calculating a pixel change value for pixels within the sub-images depending on the corresponding pixel detail signal,
• calculation means arranged for calculating changed sub-images by changing pixel values within the sub-images depending on the corresponding pixel change value, and
• third combination means arranged for combining the changed sub-images into an output image.

A computer program product tangibly embodied in an information carrier, the computer program product comprising instructions that, when executed, cause at least one processor to perform operations comprising:

• splitting an image into at least three sub-images, wherein each of the sub-images represents a corresponding spatial frequency range of the image,
• calculating a pixel detail signal for at least one of the sub-images, depending on at least a pixel detail signal of another frequency range,
• calculating a pixel change value for pixels within the sub-images depending on the corresponding pixel detail signal,
• calculating changed sub-images by changing pixel values within the sub-images depending on the corresponding pixel change value, and
• combining the changed sub-images into an output image.