Processing imaging data

Patent metadata

Field	Value
Publication number	US-9905021-B2
Application number	US-201514684676-A
Country	US
Kind code	B2
Filing date	Apr 13, 2015
Priority date	Apr 16, 2014
Publication date	Feb 27, 2018
Grant date	Feb 27, 2018

Abstract

A method is provided for processing image data, wherein the image data are given by an image bitmap including pixels, wherein each pixel has exactly one pixel color value. Regions including pixels having a prespecifiable first color value and a prespecifiable maximum pixel spacing are overwritten by a rectangle having a prespecifiable second color value. This method advantageously allows for anonymization of selected image data on the basis of pixel color values to be carried out. The method may be used universally, independently of the form of the information to be anonymized (e.g., embedded texts, tables, images).

First claim

The invention claimed is:

1. A method for processing image data, the method comprising:
providing image data by an image bitmap comprising pixels, wherein each pixel has exactly one pixel color value out of a plurality of color values;
identifying, by a hardware processor by row- and column-wise searching of the image bitmap, pixel regions in which at least one pixel with a first color value of the plurality of color values appears, wherein a pixel region is defined in that a spacing between two pixels having the first color value is less than a prespecifiable first value;
ascertaining, by the hardware processor, outermost left, right, upper, and lower boundaries of each pixel region, wherein the boundaries are defined as corners of a respective rectangle;
constructing a first rectangle that completely encloses each pixel region;
selectively combining overlapping first rectangles to form one or more second rectangles until no further overlaps of the first rectangles exists, and continuing combining overlapping rectangles until no further overlaps of rectangles exist; and
encrypting, by the hardware processor, the image data to hide sensitive information within the image data from an unauthorized person by overwriting, by the hardware processor, an area of the one or more ultimately combined rectangles with a prespecifiable second color value different from the first color value.

2. The method as claimed in claim 1 , wherein the pixel spacing indicates the row and column spacing of the pixels having the first color value.

3. The method as claimed in claim 2 , wherein each first rectangle is larger than the enclosed pixel region by at least one pixel in terms of a height and a width of the first rectangle.

4. The method as claimed in claim 3 , wherein the pixel color value is given by an ARGB color value.

5. The method as claimed in claim 2 , wherein the pixel color value is given by an ARGB color value.

6. The method as claimed in claim 1 , wherein each first rectangle is larger than the enclosed pixel region by at least one pixel in terms of a height and a width of the first rectangle.

7. The method as claimed in claim 1 , wherein the pixel color value is given by an ARGB color value.

8. The method as claimed in claim 1 , wherein the overlapping first rectangles are combined to form one or more second rectangles until no further overlaps of the first rectangles exists, and the overlapping rectangles are continually combined until no further overlaps of rectangles exist.

9. The method as claimed in claim 8 , wherein each first rectangle is larger than the enclosed pixel region by at least one pixel in terms of a height and a width of the first rectangle.

10. The method as claimed in claim 9 , wherein the pixel color value is given by an ARGB color value.

11. The method as claimed in claim 8 , wherein the pixel color value is given by an ARGB color value.

Assignees

• Hertlein Thomas
• Siemens Ag

Inventors

• Hertlein Thomas

Classifications

• G06F21/6254

  by anonymising data, e.g. decorrelating personal data from the owner's identification · CPC title

• G06T11/60

  Creating or editing images; Combining images with text · CPC title

• G06T7/90 Primary

  Determination of colour characteristics · CPC title

• G06T2207/30176

  Document · CPC title

• G06T7/408 Primary

  Physics · mapped topic