S cale invariant code is a code that will remain identical even when we change the scale of an object means when we scale in/out, the output chain code will remain same, so it can be used in object representation and recognition. The algorithm is developed for Nastaliq characters, but is it general in nature and can be used for boundary representation of any object. The basic idea is that instead of storing and computing the chain code of each pixel, we create segments by using corner points and develop a new code for the segments not for pixels, and that code will be scale invariant and of course will be much shorter than the chain code. A segment is a portion between two corner points; as the ratio between segments will remain same even when we change the scale of image, so we compute the ratio of each segment to the whole image, and will finally compute optimized scale invariant code.
An efficient scheduling strategy guarantees the simultaneous transmission and successful reception by the scheduled nodes even inside a congested wireless ad hoc network. Owing to the dispersed nature of ad hoc networks, the node packing algorithm needs to be implementable without having network-wide channel state information and should additionally be able to pack the optimum number of successful transmissions. The proposed algorithm, for a network with nonhomogeneously distributed nodes, makes the decision to either inhibit or permit an active interferer around an active receiver based on the interferer's transmission power. The analysis evidenced that the suggested scheme provides an estimated 100 times superior transmission capacity when equated to the random aloha scheme. Moreover, the proposed strategy proved its vitality by demonstrating substantial improvement in transmission and transport capacity in comparison to the preexisting renowned scheduling schemes for distributed networks. The final results present a closed-form formula for the best possible exclusion-zone size multiplier factor in terms of the network parameters, i.e. the network's path-loss exponent, spreading gain, SINR threshold, outage constraint, and Tx-Rx separation.
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