Method and system for inversion of raster images

• US 10,446,113 B2
• Filed: 01/30/2018
• Issued: 10/15/2019
• Est. Priority Date: 01/30/2018
• Status: Active Grant

• Current Assignee: ForeFlight LLC (The Boeing Co.)
• Original Assignee: ForeFlight LLC (The Boeing Co.)
• Inventors: Tahmasebi, Joshua Aron
• Primary Examiner(s): Amini, Javid A
• Application Number:
  US15/883,417
• Publication Number:
  US 20190237043A1
• Time in Patent Office: 623 Days
• Field of Search: 345619
• CPC Class Codes: G01C 23/00 Combined instruments indicating more than one navigational value, e.g. for aircraft; Combined measuring devices for measuring two or more variables of movement, e.g. distance, speed or acceleration
• CPC Class Codes: G09G 2320/0626 for control of overall brightness
• CPC Class Codes: G09G 2320/066 for control of contrast
• CPC Class Codes: G09G 2340/0492 Change of orientation of the displayed image, e.g. upside-down, mirrored
• CPC Class Codes: G09G 2340/12 Overlay of images, i.e. displayed pixel being the result of switching between the corresponding input pixels
• CPC Class Codes: G09G 2360/144 the light being ambient light
• CPC Class Codes: G09G 2380/12 Avionics applications
• CPC Class Codes: G09G 3/20 for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
• CPC Class Codes: G09G 5/026 Control of mixing and/or overlay of colours in general G09G5/022 and G09G5/024 take precedence
• CPC Class Codes: G09G 5/10 Intensity circuits

Abstract

A method for inverting raster image-based maps. The method includes obtaining an original raster image of a map and making a determination that nighttime conditions apply. Based on the determination, a processed raster image of the map is obtained by obtaining an intermediate representation in which the hue of the original raster image is inverted and by inverting the hue and tone of the intermediate representation. Subsequently, the processed raster image is displayed.

Claims

1. A method for inverting raster image-based maps, comprising:

obtaining an original raster image of a map, the original raster image consisting of a plurality of pixels;

obtaining a processed raster image of the map by, within a time slot allotted to generating an image frame of a plurality of consecutive image frames based on a frame rate;

obtaining an intermediate representation by inverting the hue of each of the plurality of pixels of the original raster image, and

inverting the hue and tone of each of the plurality of pixels of the intermediate representation; and

displaying the processed raster image as the image frame.

2. The method of claim 1, further comprising displaying a background raster image, wherein the processed raster image is superimposed on top of the background raster image.

3. The method of claim 2, further comprising adjusting a brightness of the processed raster image to distinguish a background in the processed raster image from a background in the background raster image.

4. The method of claim 1, wherein obtaining the processed raster image of the map is performed based on an assessment of an available ambient light, using a photo sensor.

5. The method of claim 1, wherein obtaining the intermediate representation by inverting the hue of each of the plurality of pixels of the original raster image comprises:

converting the original raster image to a Hue-Saturation-Value (HSV) color representation; and

rotating a hue component of the HSV representation by 180 degrees.

6. The method of claim 1, wherein inverting the hue and tone of each of the plurality of pixels of the intermediate representation comprises:

converting the intermediate representation to an RGB color representation; and

inverting the RGB color representation.

7. The method of claim 1, wherein the obtaining the processed raster image is performed in real-time.

8. The method of claim 1, wherein the map is an aviation map.

9. A system for inverting raster image-based maps, comprising:

a computer processor;

a rendering engine executing on the computer processor configured to;

obtain an original raster image of a map, the original raster image consisting of a plurality of pixels;

obtain a processed raster image of the map by, within a time slot allotted to generating an image frame of a plurality of consecutive image frames based on a frame rate;

obtaining an intermediate representation by inverting the hue of each of the plurality of pixels of the original raster image, and

inverting the hue and tone of each of the plurality of pixels of the intermediate representation; and

a display displaying the processed raster image as the image frame.

10. The system of claim 9, further comprising a storage,

wherein the storage comprises a map repository, and

wherein obtaining the original raster image of the map comprises retrieving the original raster image of the map from the map repository.

11. The system of claim 9, further comprising a communication interface, wherein obtaining the original raster image of the map comprises downloading the original raster image of the map from a remote map repository, using the communication interface.

12. The system of claim 9, further comprising a photo sensor configured to assess an available ambient light, wherein obtaining the processed raster image of the map is performed based on the assessment of the available ambient light.

13. The system of claim 9, further comprising a GPS sensor, and wherein obtaining the processed raster image of the map further comprises centering the map using data obtained from the GPS sensor.

14. The system of claim 9, wherein obtaining the intermediate representation by inverting the hue of each of the plurality of pixels of the original raster image comprises:

converting the original raster image to a Hue-Saturation-Value (HSV) color representation; and

rotating a hue component of the HSV representation by 180 degrees.

15. The system of claim 9, wherein inverting the hue and tone of each of the plurality of pixels of the intermediate representation comprises:

converting the intermediate representation to an RGB color representation; and

inverting the RGB color representation.

16. The system of claim 9, wherein the obtaining the processed raster image is performed in real-time.

17. A non-transitory computer readable medium comprising computer readable program code for causing a computer system to:

obtain an original raster image of a map, the original raster image consisting of a plurality of pixels;

obtain a processed raster image of the map by, within a time slot allotted to generating an image frame of a plurality of image frames based on a frame rate;

obtaining an intermediate representation by inverting the hue of each of the plurality of pixels of the original raster image, and

inverting the hue and tone of each of the plurality of pixels of the intermediate representation; and

display the processed raster image as the image frame.

18. The non-transitory computer readable medium of claim 17, wherein the computer readable program code further causes the computer system to display a background raster image, wherein the processed raster image is superimposed on top of the background raster image.

19. The non-transitory computer readable medium of claim 17, wherein obtaining the intermediate representation by inverting the hue each of the plurality of pixels of the original raster image comprises:

converting the original raster image to a Hue-Saturation-Value (HSV) color representation; and

rotating a hue component of the HSV representation by 180 degrees.

20. The non-transitory computer readable medium of claim 17, wherein inverting the hue and tone of each of the plurality of pixels of the intermediate representation comprises:

converting the intermediate representation to an RGB color representation; and

inverting the RGB color representation.