Tone-mapping method for reducing memory requirements

Abstract

A tone-mapping method for reducing memory requirements is provided. If an input address is smaller than a first critical address, it is directly looked up in a tone-mapping table to correspond the input address to an actual output. If the input address is larger than the first critical address, it is then determined whether the input address is larger than a second critical address or not. If it is not larger than the second critical address, two adjacent sample addresses are taken to correspond the input address to an actual output. If the input address is larger than the second critical address, four adjacent sample addresses are taken to correspond the input address to an actual output.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will become more fully understood from the detailed description given herein below for illustration only, and which thus is not limitative of the present invention, and wherein:

FIG. 1 is a tone-mapping table calculating by using an Interpolation calculation;

FIG. 2 is a schematic view of curvature characteristics of a Gamma curve adopted by a conventional Gamma correction;

FIG. 3 is a tone-mapping table for reducing memory requirements according to the present invention; and

FIG. 4 is a flow chart of the tone-mapping method for reducing memory requirements according to the present invention.

Claims

1. A tone-mapping method for reducing memory requirements, comprising: looking up a tone-mapping table directly when an input address is smaller than a first critical address to correspond the input address to an actual output;determining whether the input address is larger than a second critical address or not when the input address is larger than the first critical address;taking two adjacent sample addresses to correspond to the actual output if the input address is not larger than the second critical address; andtaking four adjacent sample addresses to correspond to the actual output if the input address is larger than the second critical address.

2. The tone-mapping method for reducing memory requirements as claimed in claim 1, wherein the tone-mapping table is applicable for a search table converting a 10˜16-bit input to an 8-bit output.

3. The tone-mapping method for reducing memory requirements as claimed in claim 2, wherein the input address comprises binary codes.