Camera and printer combination using up-interpolation of bayer image

• US 20050007471A1
• Filed: 08/02/2004
• Published: 01/13/2005
• Est. Priority Date: 09/16/1999
• Status: Active Grant

• Current Assignee: Google Inc. (Alphabet Inc.)
• Original Assignee: Silverbrook Research Pty Limited
• Inventors: Lapstun, Paul, Walmsley, Simon Robert
• Granted Patent: US 7,058,219 B2
• Time in Patent Office: Days
• US Class Current: 348/272
• CPC Class Codes: B41J 2/04528 aiming at warming up the head
• CPC Class Codes: B41J 2/04543 Block driving
• CPC Class Codes: B41J 2/04563 detecting head temperature; Ink temperature
• CPC Class Codes: B41J 2/04586 controlling heads of a type not covered by groups B41J2/04575 - B41J2/04585, or of an undefined type
• CPC Class Codes: B41J 2/04591 Width of the driving signal being adjusted
• CPC Class Codes: B41J 29/393 Devices for controlling or analysing the entire machine ; Controlling or analysing mechanical parameters involving printing of test patterns
• CPC Class Codes: G06T 2207/10024 Color image
• CPC Class Codes: G06T 3/4007 based on interpolation, e.g. bilinear interpolation image demosaicing G06T3/4015; edge-driven or edge-based scaling G06T3/403
• CPC Class Codes: G06T 3/4015 Image demosaicing, e.g. colour filter arrays [CFA] or Bayer patterns
• CPC Class Codes: G06T 3/60 Rotation of whole images or parts thereof
• CPC Class Codes: G06T 3/606 by memory addressing or mapping
• CPC Class Codes: G06T 5/003 Deblurring; Sharpening vibration or motion blur correction for cameras comprising an electronic image sensor H04N23/682
• CPC Class Codes: G06T 5/20 using local operators
• CPC Class Codes: G06T 5/73 Deblurring; Sharpening
• CPC Class Codes: H04N 1/3877 Image rotation
• CPC Class Codes: H04N 1/4092 Edge or detail enhancement
• CPC Class Codes: H04N 1/46 Colour picture communication systems
• CPC Class Codes: H04N 1/486 with separate detectors, each detector being used for one specific colour component
• CPC Class Codes: H04N 1/6016 Conversion to subtractive colour signals
• CPC Class Codes: H04N 23/843 Demosaicing, e.g. interpolating colour pixel values
• CPC Class Codes: H04N 25/134 : based on three different wavelength filter elements

Abstract

A camera comprising an image sensor comprising a Bayer color filter array adapted to capture an image; a processor; and a printer; wherein the processor receives a captured Bayer image of red, green and blue pixels from the image sensor, converts the captured image to a printable image and outputs the printable image to the printer for printing, wherein the captured image is converted to a printable image by: up-interpolating the image; sharpening the image; and converting the image to a print image of cyan, magenta and yellow pixels, and outputs the print image to the printer for printing.

Claims

1. A camera comprising:

an image sensor comprising a Bayer color filter array adapted to capture an image;

a processor; and

a printer;

wherein the processor receives a captured Bayer image of red, green and blue pixels from the image sensor, converts the captured image to a printable image and outputs the printable image to the printer for printing, wherein the captured image is converted to a printable image by;

up-interpolating the image;

sharpening the image; and

converting the image to a print image of cyan, magenta and yellow pixels, and outputs the print image to the printer for printing.

2. A camera according to claim 1 wherein up-interpolating the image comprises mapping each of the colors from an input space to an output space in accordance with the following:

3. A camera according to claim 2 wherein, for the green pixels in the input space, each co-ordinate of the input space is multiplied by 1/{square root}2.

4. A camera according to claim 1 wherein sharpening the image comprises:

converting the image from an RGB color space to a luminance space;

high-pass filtering the luminance space;

adding a proportion of the filtered luminance space to the original luminance space to produce a resultant luminance space; and

converting the resultant luminance space.

5. A camera according to claim 4 wherein the high-pass filtering utilizes a 3×

3 convolution kernel.

6. A camera according to claim 4 wherein the high-pass filtering utilizes a 5×

5 convolution kernel.

7. A camera according to claim 4 wherein the high-pass filtering utilizes a 7×

7 convolution kernel.

8. A camera according to claim 1 wherein converting the image to a print image comprises converting a contone CMY image to a dithered CMY image.