Look up table (LUT) inverse halftoning

Look-up table (LUT) method for inverse halftoning

In this paper we propose look-up table (LUT) based methods for inverse halftoning of images. The LUT for inverse halftoning is obtained from the histogram gathered from a few sample halftone images and corresponding original images. The method is extremely fast (no filtering is required) and the PSNR and visual image quality achieved is comparable to the best methods known for inverse halftonin...

Look up Table (LUT) Method for Image Halftoning

Recently we have applied Look Up Table (LUT) Method for inverse halftoning. We also proposed tree-structure LUT inverse halftoning in order to reduce memory requirements of the LUT method. In this paper we introduce LUT based halftoning method. Pixels from a causal neighborhood and the contone value of the current pixel will be included in the LUT. The LUT halftoning will require no arithmetic ...

Recent Advances in Digital Halftoning and Inverse Halftoning Methods

Halftoning is the rendition of continuous-tone pictures on displays, paper or other media that are capable of producing only two levels. In digital halftoning, we perform the gray scale to bilevel conversion digitally using software or hardware. In the last 3 decades, several algorithms have evolved for halftoning. Examples of algorithms include ordered dither, error diffusion, blue noise masks...

Template selection for LUT inverse halftoning and application to color halftones

In a recent paper we have proposed a method for inverse halftoning of monochrome images. It is a Look Up Table (LUT) based method, obtained from the histogram gathered from a few sample halftone images and corresponding original images. The method is extremely fast (no ltering is required) and the image quality achieved is comparable to the best methods known for inverse halftoning. The method ...

A Method to Parallelize Lookup Table ( LUT ) Method for Inverse Halftoning and its Hardware Implementation