Image Scanning Device Cover State Detection
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Solution Overview
Problem
Conventional image scanning devices struggle to accurately determine the area of a book-type original sheet placed on a platen, leading to potential image chipping due to assumptions of a rectangular shape, which may not align with the actual shape of the opened book, resulting in incomplete scanning.
Innovation Solution
An image scanning device with a rotatable cover and a cover sensor that detects the cover's opening state, allowing for different image processing conditions based on whether the cover is closed, half-open, or fully open, enabling accurate detection and scanning of book-type originals by adjusting the scanning area and processing conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the target area is determined based on the assumption that the original sheet has a rectangular shape, then the scanning process is simplified and efficient, but image chipping occurs when the original sheet is a book-type original placed in an opened manner
Solution Approach 1:
The patent performs a pre-scan of the entire scannable area before determining the actual original sheet area. This preliminary scanning action allows the system to detect the true boundaries of book-type originals that may be bent or spread, enabling accurate target area determination without assuming a rectangular shape, thus preventing image chipping while maintaining scanning efficiency
Solution Approach 2:
The system uses image data from the pre-scan as feedback to automatically determine the actual original sheet area and adjust the scanning parameters. By analyzing the pre-scan results, the controller identifies the true boundaries of the original sheet and sets the target area accordingly, resolving the contradiction between simplified rectangular assumption and accurate boundary detection
2Measurement precision
If the scanning unit scans the entire scannable area, then the original sheet area can be accurately determined, but the scanning time increases
Solution Approach 1:
The patent implements a pre-scan function that quickly scans the entire scannable area before the main scanning process. This preliminary action provides accurate original sheet area detection data without requiring the main scan to cover the entire area, thus reducing total scanning time while maintaining detection accuracy
Solution Approach 2:
The scanning process is divided into two segments: a pre-scan phase that covers the entire scannable area for accurate boundary detection, and a main-scan phase that only covers the determined target area. This segmentation allows the system to achieve accurate original sheet area detection while minimizing the time spent on unnecessary scanning areas
Data Source
AI summary
An image scanning device has a platen, an openable cover, a cover sensor, a scanning unit, a condition setting unit enabling a user to set a first condition, and a controller. The controller is configured to detect an opening state of the cover based on a detection signal output by the cover sensor and obtain the image data representing a partial image which is an image of a first end portion of a scannable area of the scanning unit. When the cover is in the closed state, the controller applies an image processing based on the first condition set through the condition setting unit, and when the cover is in the opened state, the controller applies the image processing based on a second condition which is a particular condition set in advance and different from the first condition.