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Instructions: Choose the best answer for each question.
1. What is the primary purpose of bilinear interpolation?
(a) To find the exact value at a point between sampled data points. (b) To create a smooth curve that connects sampled data points. (c) To estimate the value at a point between sampled data points. (d) To extrapolate the value beyond the range of sampled data points.
**(c) To estimate the value at a point between sampled data points.**
2. What type of surface is created by bilinear interpolation?
(a) A plane (b) A sphere (c) A hyperbolic paraboloid (d) A cylinder
**(c) A hyperbolic paraboloid**
3. Which of the following is NOT an advantage of bilinear interpolation?
(a) Simplicity (b) Efficiency (c) Accuracy (d) Smoothness
**(c) Accuracy** - While bilinear interpolation is relatively accurate, it's not as accurate as other methods like bicubic interpolation.
4. In the equation f(x, y) = ax + by + cxy + d, what do a, b, c, and d represent?
(a) The coordinates of the surrounding data points. (b) The interpolated values at the surrounding data points. (c) Coefficients determined by solving a system of equations. (d) The x and y coordinates of the target point.
**(c) Coefficients determined by solving a system of equations.**
5. Bilinear interpolation is commonly used in:
(a) Image resizing (b) Signal processing (c) Circuit design (d) All of the above
**(d) All of the above**
Problem: Consider a grid of four data points with the following coordinates and values:
| Point | (x, y) | Value | |---|---|---| | A | (0, 0) | 1 | | B | (1, 0) | 3 | | C | (0, 1) | 2 | | D | (1, 1) | 4 |
Task: Use bilinear interpolation to estimate the value at the point (0.5, 0.5).
**1. Form the equations:** Using the bilinear interpolation formula `f(x, y) = ax + by + cxy + d`, we plug in the coordinates and values of the four points: * Point A: `1 = a(0) + b(0) + c(0)(0) + d` => `d = 1` * Point B: `3 = a(1) + b(0) + c(1)(0) + d` => `a + d = 3` * Point C: `2 = a(0) + b(1) + c(0)(1) + d` => `b + d = 2` * Point D: `4 = a(1) + b(1) + c(1)(1) + d` => `a + b + c + d = 4` **2. Solve for the coefficients:** Solving the system of equations, we get: * `a = 2` * `b = 1` * `c = 1` * `d = 1` **3. Calculate the interpolated value:** Plug in (x, y) = (0.5, 0.5) into the interpolation formula: `f(0.5, 0.5) = 2(0.5) + 1(0.5) + 1(0.5)(0.5) + 1 = 2.75` **Therefore, the estimated value at (0.5, 0.5) using bilinear interpolation is 2.75.**
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