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# What are the individual metrics used for AIM-DPM/ISO/IEC TR29158?

Below is a list of the metrics used for AIM-DPM/ISO/IEC TR29158 quality assessment. For more detailed information on this code quality standard and its metrics, see the DataMan Communications and Programming Guide or the corresponding ISO standard documentation, which can be found at www.iso.org.

- Grid Non-Uniformity is a measurement for the amount of placement error for the individual cells from a uniformly spaced grid as measured using the clocking pattern of a symbol.

- Unused Error Correction is a measurement for the percentage of code words left in a symbol after correcting for any errors.

  When calculating Unused Error Correction, a code word is considered to be in error if at least one of its cells is on the wrong side of the global threshold. 2D Data Matrix symbols have built-in code redundancy, or the presence of duplicate data content.

  A value of 1.00 means no errors were present in any of the code words.

- Axial Non-Uniformity is a measurement of the symmetry of individual cells within the symbol, that is, the amount of deviation along the symbol's axes.

- Cell Contrast is a measurement of the reflectance difference between the bright cells and the dark cells in the symbol, represented as a percentage of the bright cells mean reflected value.

  The AIM-DPM/ISO/IEC TR 29158 specification requires that the image be adjusted so that the bright cells have a mean reflectance value of 78% of complete saturation.

- Fixed Pattern Damage is the quality of the finder , clocking, and quiet zone patterns within the mark.

  The reader uses several patterns within each symbol to locate and decode the data it contains. The reader generates the Fixed Pattern Damage grade using the same method as the Cell Modulation score, specifically a measurement of reflectance confidence.

- Modulation is a measure of readability for the actual mark.

  The grade is a reflection of how close the bright cells and dark cells approach a global threshold for a particular mark, indicating the grey-level separation point between the bright cells and the dark cells of any particular mark.

  A mark generates a low Modulation grade when there is a relatively low confidence in the reader being able to classify individual cells as either bright or dark. The score also takes into consideration the error correction capacity built into the symbol (with larger symbols having more error correction capability). For example, a mark will receive a low Modulation grade but a high Unused Error Correction grade if the majority of cells are on the verge of changing their state but do not actually do so.

- Print Growth measures the deviation of bar and space width from the intended widths (indicated in the symbology specification), that is, it measures if bars are narrower/wider compared to spaces in the symbol. The higher the difference, the lower the grade.

Note: DM050, DM060, DM070, DM080, DM150, DM260, DM280, DM290, DM300, DM360, DM370, DM380, DM390, DM470, DM503, DM580, MX-1000, MX-1500