Scanner with color profile matching mechanism

• US 20060023271A1
• Filed: 07/30/2004
• Published: 02/02/2006
• Est. Priority Date: 07/30/2004
• Status: Abandoned Application

• Current Assignee: Avago Technologies ECBU IP Singapore Pte Limited (Broadcom, Inc.)
• Original Assignee: Avago Technologies ECBU IP Singapore Pte Limited (Broadcom, Inc.)
• Inventors: Wong, King Wai, Keh, Kean Loo, Oon, Chin Hin, Boay, Yoke Peng, Maniam, Selvan
• Application Number:
  US10/902,999
• Publication Number:
  US 20060023271A1
• Time in Patent Office: Days
• US Class Current: 358/504
• CPC Class Codes: H04N 1/4005 with regulating circuits, e.g. dependent upon ambient temperature or feedback control
• CPC Class Codes: H04N 1/40056 Circuits for driving or energising particular reading heads or original illumination means H04N1/401, H04N1/407 take precedence

Abstract

Scanner with light source calibration mechanism. The scanner includes a light source that generates a white light utilized to scan an image. The light source calibration mechanism includes a calibration color sensor that generates a calibration color sensor output. The light source calibration mechanism receives a predetermined color profile that can be, for example, the amount of red, green light, and blue light expected from the light source utilized by the scanner for scanning. The color calibration mechanism calibrates the light source of the scanner based on the output of the calibration color sensor and the predetermined color profile.

Claims

1. A scanner that includes a color space comprising:

a light source that generates a light;

a light source calibration mechanism coupled to the light source;

wherein the light source calibration mechanism includes;

a calibration color sensor to generate a calibration color sensor output;

wherein the light source calibration mechanism receives a predetermined color profile and calibrates the light source based on the output of the calibration color sensor and the predetermined color profile.

2. The scanner of claim 1 further comprising:

an image sensor that generates an image sensor output;

wherein the image sensor is a contact image sensor;

wherein the light source calibration mechanism receives a predetermined color profile and calibrates the color space of the scanner based on the output of the calibration color sensor, the image sensor output, and the predetermined color profile.

3. The scanner of claim 1 wherein the light source includes a red light emitting diode, a green light emitting diode, and a blue light emitting diode.

4. The scanner of claim 3 wherein the predetermined color profile includes an amount of red light, an amount of green light, and an amount of blue light expected from scanning a reference image.

5. The scanner of claim 1 wherein the calibration color sensor includes one of a photo sensor, a photo diode, and a photo transistor.

6. The scanner of claim 1 further comprising:

a light source intensity adjustment mechanism coupled to the light source that receives a resolution identifier and selectively adjusts the intensity of the light source based on the resolution identifier.

7. The scanner of claim 1 further comprising:

a real time color calibration mechanism that maintains a color point on a real-time basis.

8. The scanner of claim 1 further comprising:

a light source driver that generates drive signals for the light source based on a color point;

wherein the light source includes a red light emitting diode, a green light emitting diode, and a blue light emitting diode;

wherein each light emitting diode is driven by a respective drive signal;

wherein the color calibration mechanism selectively adjusts the color point in response to the output of the calibration color sensor, the image sensor output, and the predetermined color profile.

9. The scanner of claim 8 wherein the color point is a RGB ratio.

10. The scanner of claim 1 further comprising:

a light guide that mixes color light and directs the mixed light to an image to be scanned.

11. The scanner of claim 1 further comprising:

a lens array that receives light reflected from the scanned image and directs the reflected light to the image sensor.

12. An scanner comprising:

a) a contact image sensor (CIS);

b) a light source that includes a red light emitting diode (LED), a green light emitting diode (LED), and a blue light emitting diode (LED);

wherein each light emitting diode is driven by a corresponding drive signal; and

c) a color calibration sensor that generates a color calibration sensor output;

d) an image sensor that generates an image sensor output; and

e) a color profile mapping mechanism for receiving a predetermined color profile, image sensor output, and color calibration sensor output and based thereon for selectively adjusting the light source drive signals.

13. The scanner of claim 12 wherein the image sensor output includes a RGB sensor output.

14. A method for calibrating the color space of a scanner comprising:

employing a color sensor to selectively control an illuminant color point;

performing a scan with an illuminant that utilizes the illuminant color point.

15. The method of claim 14 wherein the color measured by the color sensor is dependent on an illumination spectrum and the spectral response of the image color.

16. The method of claim 14 further comprising:

adjusting the intensity of the light source based on a selected scan resolution.

17. The method of claim 15 further comprising:

maintaining the illuminant color point on a real-time basis; and

adjusting the illuminant color point on a real-time basis.