Image processing using multiple imaging devices

• US 8,817,345 B2
• Filed: 05/14/2013
• Issued: 08/26/2014
• Est. Priority Date: 04/25/2003
• Status: Active Grant

• Current Assignee: Baldwin Americas Corporation (Forsyth Baldwin LLC)
• Original Assignee: Quad/Tech Incorporated
• Inventors: Noffke, Patrick James
• Primary Examiner(s): Riley, Marcus T
• Application Number:
  US13/893,946
• Publication Number:
  US 20130321887A1
• Time in Patent Office: 469 Days
• Field of Search: None
• US Class Current: 358/514
• CPC Class Codes: B41F 33/0036 Devices for scanning or checking the printed matter for quality control
• CPC Class Codes: G01J 3/2823 Imaging spectrometer
• CPC Class Codes: G01J 3/50 using electric radiation detectors
• CPC Class Codes: G01J 3/502 using a dispersive element, e.g. grating, prism
• CPC Class Codes: G01J 3/513 having fixed filter-detector pairs
• CPC Class Codes: G01J 3/524 Calibration of colorimeters
• CPC Class Codes: H04N 1/00023 Colour systems
• CPC Class Codes: H04N 1/48 Picture signal generators for halftone screening H04N1/52

Abstract

Apparatus and methods for image processing using multiple imaging devices are provided. A first imaging device is configured to acquire a first image of a portion of a printed substrate and the second imaging device is configured to acquire a second image of a portion of the printed substrate. At least a portion of the first image and the second image are acquired from the same portion of the printed substrate at the same time. The first imaging device is configured to process color data from the first image using a first processing circuit of the first imaging device and the second imaging device is configured to process spatial information from the second image using a separate second processing circuit of the second imaging device.

Claims

1. An image processing apparatus for use with a printed substrate, the image processing apparatus comprising:

a first imaging device configured to receive light reflected from the printed substrate and configured to process color data from the light; and

a second imaging device configured to receive light reflected from the printed substrate and configured to process spatial information from the light;

wherein the first imaging device is configured to acquire a first image of a portion of the printed substrate and the second imaging device is configured to acquire a second image of a portion of the printed substrate, wherein at least a portion of the first image and the second image are acquired from the same portion of the printed substrate at the same time, and wherein the first imaging device is configured to process the color data from the first image using a first processing circuit of the first imaging device and the second imaging device is configured to process the spatial information from the second image using a separate second processing circuit of the second imaging device.

2. The image processing apparatus of claim 1, wherein the first imaging device is configured to process the color data from light reflected from a colorbar.

3. The image processing apparatus of claim 2, wherein the first imaging device is configured to process the color data from light reflected from a portion of multiple patches of the colorbar.

4. The image processing apparatus of claim 1, wherein the first imaging device comprises a line-scan sensor.

5. The image processing apparatus of claim 1, wherein the second imaging device comprises an area-scan CCD sensor.

6. The image processing apparatus of claim 1, wherein the second imaging device is coupled to a fiber optic bundle to capture and direct the light reflected from the printed substrate to the second imaging device.

7. The image processing apparatus of claim 1, wherein the first imaging device has a higher spectral resolution than the second imaging device.

8. The image processing apparatus of claim 1, wherein the first imaging device acquires an image based on a signal from the second imaging device.

9. The image processing apparatus of claim 1, wherein the spatial information from the second imaging device is used to control registration of the first imaging device.

10. The image processing apparatus of claim 1, wherein the color data from the first imaging device is used to calibrate the second imaging device.

11. The image processing apparatus of claim 1, wherein a first dynamic sensor range of the first imaging device and a second dynamic sensor range of the second imaging device are different.

12. The image processing apparatus of claim 1, further comprising an illuminator, the illuminator configured to illuminate a first area based on a first control signal and to illuminate a second area based on a second control signal;

wherein the second control signal is based on locating the colorbar; and

wherein the second area is smaller than the first area.

13. The image processing apparatus of claim 1, further comprising a housing in which both the first imaging device and the second imaging device are positioned, wherein the first imaging device and the second imaging device are positioned in the housing in such a manner that the first imaging device and the second imaging device are directed at the same portion of the printed substrate.

14. An image processing apparatus for use with a printed substrate, the image processing apparatus comprising:

a first imaging device configured to receive light reflected from a portion of a colorbar on the printed substrate and configured to process color data from the light reflected from the portion of the colorbar; and

a second imaging device configured to receive light reflected from the printed substrate and configured to process spatial information from the light;

wherein the first imaging device is configured to acquire a first image of a portion of the printed substrate and the second imaging device is configured to acquire a second image of a portion of the printed substrate, wherein at least a portion of the first image and the second image are acquired from the same portion of the printed substrate at the same time, and wherein the first imaging device is configured to process the color data from the first image using a first processing circuit of the first imaging device and the second imaging device is configured to process the spatial information from the second image using a separate second processing circuit of the second imaging device.

15. The image processing apparatus of claim 14, wherein the portion of the colorbar comprises a slice of multiple patches of the colorbar.

16. The image processing apparatus of claim 14, wherein the color data from the first imaging device is used to calibrate the second imaging device.

17. The image processing apparatus of claim 14, further comprising an illuminator, the illuminator configured to illuminate a first area based on a first control signal and to illuminate a second area based on a second control signal;

wherein the second control signal is based on locating the colorbar; and

wherein the second area is smaller than the first area.

18. A method comprising:

acquiring a first image of a portion of a printed substrate using a first imaging device;

acquiring a second image of a portion of the printed substrate using a second imaging device, wherein at least a portion of the first image and the second image are acquired from the same portion of the printed substrate at the same time;

processing color data from the first image using a first processing circuit of the first imaging device; and

processing spatial information from the second image using a separate second processing circuit of the second imaging device.

19. The method of claim 18, wherein acquiring the first image comprises acquiring the first image from light reflected from a colorbar.

20. The method of claim 19, wherein acquiring the first image comprises acquiring the first image from light reflected from a portion of multiple patches of the colorbar.