Question

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Explanation:

🆕 New Concept Discovered: Perspective Correction
Adjusting tilted images to find true vertical and horizontal lines.

Step 1: Analyze the tilt angle

To determine how much the image needs to be rotated to be straight, we can look at the vertical and horizontal reference lines in the room:

• The vertical edge of the window frame on the left.
• The vertical corner where the two walls meet (or the vertical edge of the window column).
• The horizontal top edge of the window roller shade.

Looking at the vertical frame of the window, it tilts to the left as it goes upward. To make this line perfectly vertical, the image needs to be rotated clockwise.

Step 2: Estimate the rotation angle

By measuring the angle of the window frame relative to the edge of the image:

• The vertical lines are tilted approximately \( 11^{\circ} \) to \( 12^{\circ} \) counter-clockwise from the true vertical.
• To correct this perspective and make the walls and window frame straight, a clockwise rotation of approximately \( 11.5^{\circ} \) is required.

Answer:

To make the image straight, it needs to be rotated \( 11.5^{\circ} \) clockwise (or between \( 11^{\circ} \) and \( 12^{\circ} \) clockwise).