Image processing device

JP2025042641A5Pending Publication Date: 2026-09-28CANON DENSHI KK
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Patent Information

Application Number
JP2023149677
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2023-09-15
Publication Date
2026-09-28

AI Technical Summary

Technical Problem

In the prior art, when judging whether a color document is blank, there is a situation where it is impossible to correctly distinguish the background color and text of the document. Especially when the density of the background color and text are the same, judgment through the average density value will lead to blurring of the boundaries and misjudging it as blank.

Method used

By acquiring multiple components of a color image, the number of edges of each component is calculated, and the determination value is calculated based on the number of edges to determine whether the document is blank.

Benefits of technology

Even if the background color of the document and the text color are the same, edge recognition can still accurately determine whether the document is blank and avoid misjudgment.

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Abstract

To determine appropriately whether a document is blank even when the document contains colored text or other content or a colored background in determining whether a document is blank.SOLUTION: An image processing device has acquisition means for acquiring multiple components Y, Cb, and Cr that make up a color image obtained by reading a document, edge counting means 362 for counting the number of edges in image data for each of the multiple components Y, Cb, and Cr acquired by the acquisition means, a determination value calculation means 363 that calculates a determination value for determining whether the document is blank on the basis of the edge count, and blank determination means 364 that determines whether the document is blank on the basis of the determination value.SELECTED DRAWING: Figure 8
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