*3.3. Access Time*

Several tests were conducted to see what the access time was like to query the cells in each image and we found that the time for a random cell access took longer for a predictor compared to just using the *k*2-raster. This was expected but we should bear in mind that the bit rates are reduced when a predictor is used, thus decreasing storage size and transmission rate. Note that the last column also lists the time to decompress a gzip image file and it took at least 4 or 5 times longer than using a predictor to randomly access the data 10<sup>5</sup> times. Table 4 shows the results of access time in milliseconds for 100,000 iterations of random cell query done by getCell(), a function which was described in the paper from Ladra et al. [20] for accessing pixel values in a *k*2-raster.


**Table 4.** A comparison of access time (in milliseconds) using *k*2-raster only and *k*2-raster with predictive and differential encoders.
