Objects and Measurements

Five questions. Choose one answer for each, then submit to see your score and explanations.

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1. Which explanation matches label connected regions?A. Boundary tracing follows a binary shape's edge; preprocessing and connectivity affect the path.B. Area counts foreground pixels, while perimeter follows the border; derived ratios describe shape under a chosen convention.C. Connected-component labeling groups foreground pixels under a chosen neighborhood rule.D. Physical area needs calibrated scale in both axes; a linear scale is squared for area.

2. Which explanation matches trace a boundary without confusing noise?A. Connected-component labeling groups foreground pixels under a chosen neighborhood rule.B. Boundary tracing follows a binary shape's edge; preprocessing and connectivity affect the path.C. Area counts foreground pixels, while perimeter follows the border; derived ratios describe shape under a chosen convention.D. Physical area needs calibrated scale in both axes; a linear scale is squared for area.

3. Which explanation matches measure area, perimeter, and shape?A. Area counts foreground pixels, while perimeter follows the border; derived ratios describe shape under a chosen convention.B. Connected-component labeling groups foreground pixels under a chosen neighborhood rule.C. Boundary tracing follows a binary shape's edge; preprocessing and connectivity affect the path.D. Physical area needs calibrated scale in both axes; a linear scale is squared for area.

4. For trace a boundary without confusing noise, which result or action fits this practical case: An extracted outline wiggles around grain near a part edge.A. Count groups with four-neighbor and eight-neighbor connectivity to see diagonal contacts differ.B. Compare two masks with equal area but different boundary roughness.C. At 0.1 mm per pixel on each axis, 500 pixels cover 5 square millimeters.D. Compare the contour before and after removing isolated specks.

5. For convert pixels to physical units with calibration, which result or action fits this practical case: A part spans 500 pixels, but the report must say square millimeters.A. Count groups with four-neighbor and eight-neighbor connectivity to see diagonal contacts differ.B. Compare the contour before and after removing isolated specks.C. At 0.1 mm per pixel on each axis, 500 pixels cover 5 square millimeters.D. Compare two masks with equal area but different boundary roughness.

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Objects and Measurements

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