Question 1: Explain in your own words what a digital image is and how it is stored in a computer.

Answer: A digital image is a visual representation created using pixels, which are tiny squares of color. It is stored as data that describes the color and brightness of each pixel, often using binary codes such as RGB values.

Question 2: Describe the purpose of a pixel in digital images.

Answer: A pixel is the smallest unit of a digital image, representing a single point of color and brightness.

Question 3: If an image has a resolution of 1920 x 1080 pixels and uses 24 bits per pixel, calculate the total number of bits required to store the image.

Answer: Total bits = width x height x bits per pixel = 1920 x 1080 x 24 = 49,766,40 bits.

Question 4: Complete the truth table for an AND gate with two inputs, A and B, and one output, Q.

Answer: {"A":["0","0","1","1"],"B":["0","1","0","1"],"Q":["0","0","0","1"]}

Question 5: Draw a logic circuit diagram for an OR gate with two inputs labeled A and B, and one output Q. Label all components clearly.

Answer: A correct sketch will include an OR gate symbol with two input lines entering from the left, labeled A and B, and one output line on the right labeled Q. The circuit should be neatly drawn with clear labels.

Question 6: Explain the difference between a NOT gate and an AND gate in terms of their function and truth tables.

Answer: A NOT gate inverts its input; if input is 0, output is 1, and vice versa. An AND gate outputs 1 only when both inputs are 1; otherwise, it outputs 0.

Question 7: Sketch a simple block diagram showing how a computer might process an image file from storage to display on a screen.

Answer: The sketch should include blocks labeled 'Storage', 'Processor', 'Memory', and 'Display', with arrows indicating data flow from storage to display, passing through processing and memory.

Question 8: Describe how binary encoding is used to represent pixel colors in images.

Answer: Binary encoding represents pixel colors using binary numbers, typically combining values for red, green, and blue (RGB). Each color component is assigned a certain number of bits, and together they form a binary code that specifies the exact color.

Question 9: What is the significance of the resolution in an image, and how does it affect the image quality?

Answer: Resolution determines the number of pixels in an image. Higher resolution means more pixels, resulting in clearer, more detailed images, while lower resolution produces less detail.

Question 10: Draw a truth table for a NAND gate with two inputs, A and B, and one output Q. Label the columns clearly.

Answer: A correct truth table will have columns labeled A, B, and Q, with all input combinations listed and the output Q being the inverse of an AND gate (i.e., Q is 0 only when both A and B are 1).

Question 11: Explain why logic gates are fundamental in digital systems, especially in image processing.

Answer: Logic gates are fundamental because they perform basic logical operations that enable decision-making and processing within digital systems. In image processing, they are used in algorithms, filters, and processing circuits to manipulate image data efficiently.