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Hence, this modified routine computes the absolute value of the gradient. Figure 35 shows a 1D example of a Laplacian convolution kernel. The straightforward way to compute this convolution is to do the following in the interrogation loop. Increment the stack of registers by 1 if the left neighbor has passed the threshold. Increment this value by 1 if the right neighbor has 40 ANDERS ASTROM AND ROBERT FORCHHEIMER W I FIGURE35. A 1D Laplacian operator. passed the threshold. Decrement this value by 2 if the center pixel has passed the threshold.
All the N diode voltages are shown along the x-axis. Then, the photodiodes will be discharged at a rate that is proportional to the incoming light. At a certain point in time t > 0 the voltage over the photodiode array may look like that found in Fig. lob. During the discharge process we continuously interrogate the output from all comparators to see if the threshold has been crossed somewhere. When this occurs, the loop is terminated and we obtain the position of the pixel with the highest intensity by performing an LFILL operation on the accumulator followed by a COUNT (see Fig.
The programmer’s model of one SPE. corresponds to the neighborhood shown in Fig. 39. Each parameter (a,b,c,d,e) takes one of the values (0, 1, X ( = don’t care)). This means that the instruction Id (xloxx) pd will perform the same operation as Id (lox) in the 1D case. 44 ANDERS ASTROM AND ROBERT FORCHHEIMER The 2D GLU shown in Fig. 39 performs global operation with the bus and the accumulator as input operands. The output is the result after the global operation, the bus, or the accumulator. Unlike in the NlD, the GLU neighbor connections are controlled in a way that makes it possible to select certain propagation directions across the array.