Image processing apparatus and image forming apparatus which recognize orientation of document image
AssigneeMinolta Co., Ltd.
InventorsShoji Imaizumi, Kazuhiro Ueda
Life of this patent
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Abstract
An image processing apparatus is provided with a binarization processing unit separately from a pseudo gradation processing unit that binarizes image data of a document image according to an error diffusion method. The binarization processing unit binarizes the image data of the document image using a threshold that is set higher than a threshold used by the pseudo gradation processing unit, with each threshold representing a different predetermined density level. Histograms showing the density distribution of the document image are generated from the image data binarized by the binarization processing unit. The orientation of the document image is recognized by the histograms.
Claims18
An image processing apparatus comprising:
- a pseudo gradation processing unit which performs a pseudo gradation process on image data of a document image according to a pseudo halftone reproduction method;
- an N-value processing unit which generates N-value image data (N≧2) using the image data of the document image;
- wherein the N-value processing unit is different from said pseudo gradation processing unit;
- and
- a recognition controller which recognizes an orientation of the document image using the N-value image data generated by the N-value processing unit.
An image forming apparatus comprising:
- a receiving unit which receives image data of a document image;
- a pseudo gradation processing unit which performs a pseudo gradation process on the image data received by the receiving unit according to a pseudo halftone reproduction method;
- an image forming unit which reproduces the document image using the image data that has been subjected to the pseudo gradation process;
- an N-value processing unit which converts the image data received by the receiving unit into N-value image data (N≧2) expressed by N-level of values;
- wherein the N-value processing unit is different from said pseudo gradation processing unit;
- and
- a recognition controller which recognizes an orientation of the document image using the N-value image data converted by the N-value processing unit.
An image processing apparatus comprising:
- a receiving unit which receives image data of a document image;
- a first binarizing circuit which binarizes the image data received by the receiving unit to generate first binarized image data, according to a first method;
- an image processing circuit which performs an image process on the first binarized image data;
- a second binarizing circuit which binarizes the image data received by the receiving unit to generate second binarized image data, according to a second method that is different from the first method;
- and
- a recognition controller which recognizes an orientation of the document image using the second binarized image data.
An image processing apparatus comprising:
- a receiving unit which receives image data of a document image;
- a first binarizing circuit which binarizes the image data received by the receiving unit to generate first binarized image data, according to a first method;
- an image processing circuit which performs an image process on the first binarized image data;
- a second binarizing circuit which binarizes the reduced resolution image data to generate second binarized image data, according to a second method that is different from the first method;
- and
- a recognition controller which recognizes an orientation of the document image using the second binarized image data,
- wherein the first binarizing circuit binarizes the image data using a first threshold representing a density level and the second binarizing circuit binarizes the image data using a second threshold representing another density level, with the second threshold being set higher than the first threshold.
Dependencies are inferred from the claim text.