Download Computer vision by Dana H. Ballard, Christopher M. Brown PDF

By Dana H. Ballard, Christopher M. Brown

The ebook is geared up into 4 components, according to descriptions of gadgets at 4 assorted degrees of abstraction. 1. Generalized images-images and image-likeentities. 2. Segmented images-images prepared into subimagcs which are more likely to correspond to "interesting gadgets. three. Geometric structures-quantitative versions of imageand international buildings. four. Relational structures-complex symbolic descriptions of photograph and international buildings.

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This is done to reduce development costs and compress design schedules. For example, consider a system that has a CPU, graphics chip, I/O chip, and a system bus. The CPU designers would build the next-generation CPU themselves at an RTL level, but they would use behavioral models for the graphics chip and the I/O chip and would buy a vendor-supplied model for the system bus. Thus, the system-level simulation for the CPU could be up and running very quickly and long before the RTL descriptions for the graphics chip and the I/O chip are completed.

T_FF tff0(q[0],clk, reset); T_FF tff1(q[1],q[0], reset); T_FF tff2(q[2],q[1], reset); T_FF tff3(q[3],q[2], reset); endmodule In the above module, four instances of the module T_FF (T-flipflop) are used. Therefore, we must now define (Example 2-4) the internals of the module T_FF, which was shown in Figure 2-4. Example 2-4 Flipflop T_FF module T_FF(q, clk, reset); output q; input clk, reset; wire d; D_FF dff0(q, d, clk, reset); not n1(d, q); // not is a Verilog-provided primitive. case sensitive endmodule Since T_FF instantiates D_FF, we must now define (Example 2-5) the internals of module D_FF.

Ports are also referred to as terminals. 1 List of Ports A module definition contains an optional list of ports. If the module does not exchange any signals with the environment, there are no ports in the list. Consider a 4-bit full adder that is instantiated inside a top-level module Top. The diagram for the input/output ports is shown in Figure 4-3. Figure 4-3. I/O Ports for Top and Full Adder Notice that in the above figure, the module Top is a top-level module. The module fulladd4 is instantiated below Top.

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