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Method and apparatus for adjusting correlated color temperature
| Details |
Inventors: Beretta, Giordano Bruno;
Assignee: Canon Information Systems, Inc. (Costa Mesa, CA)
Primary Examiner: Rogers; Scott
Assistant Examiner:
Attorney, Agent or Firm: Fitzpatrick, Cella, Harper & Scinto
A color printing system includes a central processing unit for generating color image data, a color monitor for displaying color image data generated by the central processing unit and a color temperature sensing device for sensing color temperature of viewing light in which color images displayed on the monitor and color images printed by the printer are viewed. A first light source has a light output intensity controllable by the central processing unit. The central processing unit is adapted to control the intensity of the first light source in accordance with the color temperature sensed by the sensing device so as to match the color temperature sensed by the sensing device to a potential color temperature. Additionally, a second light source may be provided. The second light source has a different color temperature than the first light source and the central processor can adjust the intensity of the first and second light source based on relative color temperatures. The central processing unit is adapted to adjust the color temperature of either or both intensity of the first and second light sources. |
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DETAILED DESCRIPTION It is an object of the present invention to address the foregoing difficulties.
The invention provides a digital color temperature sensor which provides a digital signal of white color temperature in response to a digital request to provide the white color temperature.
The color temperature sensor device includes calibratable color sensors, and is most preferably fabricated on a single substrate or on a single VLSI chip.
According to this aspect of the invention, a color temperature measuring device for measuring the color temperature of light comprises a substrate, a sensor fixed to the substrate for individually sensing the plural color components of light incident on the sensor and for providing plural corresponding digital color component signal representative of the color components, a memory fixed to the substrate for storing correction data for correcting the digital color component signals from the sensor, and a processor also fixed to the substrate and including a digital interface.
The processor receives the plural digital color component signals from the sensor, accesses the correction data in the memory to correct the plural digital signals in accordance with that correction data, derives a white color temperature from the corrected color component signals, and in response to a request to provide a white color temperature, outputs the white color temperature on the digital interface.
The digital interface may be provided by an input/output (I/O) interface which may also receive the request.
The interface may be addressable, thereby allowing the device to be connected to a serial line and monitor the serial line for requests that are specifically addressed to it.
An alarm may also be provided to indicate that the sensed digital color component signals pertain to a light source whose chromaticity is outside the range of the white line.
In addition to the foregoing sensing mode, the device may also be operable in a calibration mode, and in this case may be provided with an internal light source such as an LED by which new correction data for the sensors may be derived
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