For example, a grayscale picture of the planet Saturn will be transformed into a color image to emphasize the differences in its rings.Ī classic example of reducing run-time computations using lookup tables is to obtain the result of a trigonometry calculation, such as the sine of a value. In data analysis applications, such as image processing, a lookup table (LUT) is used to transform the input data into a more desirable output format. For data requests that fall between the table's samples, an interpolation algorithm can generate reasonable approximations by averaging nearby samples." "Lookup tables (LUTs) are an excellent technique for optimizing the evaluation of functions that are expensive to compute and inexpensive to cache. Red (A), Green (B), Blue (C) 16-bit lookup table file sample. ( October 2021) ( Learn how and when to remove this template message) Statements consisting only of original research should be removed. Please improve it by verifying the claims made and adding inline citations. This section possibly contains original research. LUTs differ from hash tables in a way that, to retrieve a value v Lookup tables in image processing FPGAs also make extensive use of reconfigurable, hardware-implemented, lookup tables to provide programmable hardware functionality. Lookup tables are also used extensively to validate input values by matching against a list of valid (or invalid) items in an array and, in some programming languages, may include pointer functions (or offsets to labels) to process the matching input. The tables may be precalculated and stored in static program storage, calculated (or "pre-fetched") as part of a program's initialization phase ( memoization), or even stored in hardware in application-specific platforms. The savings in processing time can be significant, because retrieving a value from memory is often faster than carrying out an "expensive" computation or input/output operation. In computer science, a lookup table ( LUT) is an array that replaces runtime computation with a simpler array indexing operation, in a process termed as direct addressing. Array that replaces runtime computation with a simpler array indexing operation
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