Image processing apparatus and mobile terminal apparatus

• US 20060215044A1
• Filed: 08/03/2005
• Published: 09/28/2006
• Est. Priority Date: 03/22/2005
• Status: Active Grant

• Current Assignee: Maxell, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Tsuru, Yasutaka, Masuda, Kozo
• Granted Patent: US 7,671,901 B2
• Time in Patent Office: Days
• US Class Current: 348/224.100
• CPC Class Codes: H04N 21/4131 home appliance, e.g. lighting, air conditioning system, metering devices home automation data switching networks exchanging configuration information on appliance services H04L12/2807
• CPC Class Codes: H04N 21/41407 embedded in a portable device, e.g. video client on a mobile phone, PDA, laptop constructional details of equipment or arrangements specially adapted for portable computer application G06F1/1626; arrangements specially adapted for mobile receivers in broadcast systems H04H20/57
• CPC Class Codes: H04N 21/42202 environmental sensors, e.g. for detecting temperature, luminosity, pressure, earthquakes
• CPC Class Codes: H04N 21/4318 by altering the content in the rendering process, e.g. blanking, blurring or masking an image region image enhancement or restoration in general G06T5/00
• CPC Class Codes: H04N 21/44008 involving operations for analysing video streams, e.g. detecting features or characteristics in the video stream arrangements characterised by components specially adapted for monitoring, identification or recognition of video in broadcast systems H04H60/59
• CPC Class Codes: H04N 5/20 Circuitry for controlling amplitude response
• CPC Class Codes: H04N 5/58 in dependence upon ambient light
• CPC Class Codes: H04N 9/643 Hue control means, e.g. flesh tone control
• CPC Class Codes: H04N 9/68 for controlling the amplitude of colour signals, e.g. automatic chroma control circuits H04N9/71, H04N9/73 take precedence; camera processing pipelines for controlling the colour saturation of colour signals H04N23/86

Abstract

An image processing apparatus has an input portion for receiving video signals, an illumination sensor for detecting illumination of an environmental light, a corrector for correcting the video signals, and a controller for controlling the corrector to correct the video signals in accordance with distribution of luminance or hue or saturation of the video signals and with the detected illumination when any change occurs in the video signal. The apparatus further has a detector for detecting a change of the video signals in accordance with a mean value of luminance of the inputted video signals, a corrector for correcting the video signals, and a controller for controlling the correction portion to correct the video signals in accordance with distribution of luminance or hue or saturation of the video signals when the detector detects the change of the video signals.

Claims

1. An image processing apparatus comprising:

an input portion to which video signals are inputted;

an illumination sensor for detecting illumination;

a corrector which corrects the video signals inputted to the input portion; and

a controller which executes control so that the correction portion corrects the video signals in accordance with distribution of luminance or hue or saturation of the video signals and with the illumination detected by the illumination sensor when any change occurs in the video signal inputted to the input portion.

2. An image processing apparatus according to claim 1, wherein the controler corrects luminance of the video signal without correcting hue and saturation of the video signal when the change of the video signal does not occur and when the illumination detected by the illumination sensor is above a predetermined value.

3. An image processing apparatus according to claim 2, wherein the corrector executes correction in such a fashion as to increase an illumination tone on black side of the video signal.

4. An image processing apparatus according to claim 1, further comprising:

a color detector which detects colors of light;

wherein the controller executes control in such a fashion as to change correction of the video signal by the corrector in accordance with the kind of the color detected by the color detector.

5. An image processing apparatus according to claim 1, further comprising:

a detector which detects the occurrence of the change of the video signal;

wherein the detector detects the occurrence of the change of the video signal when a mean value of luminance of the video signal changes.

6. An image processing apparatus according to claim 1, wherein the change is a scene change portion.

7. A mobile terminal device comprising:

an input portion to which video signals are inputted;

a detector which detects a change of the video signals in accordance with a mean value of luminance of the video signals inputted to the input portion;

a corrector which corrects the video signals inputted to the input portion; and

a controller which executes control so that the corrector corrects the video signals in accordance with distribution of luminance or hue or saturation of the video signals when the detector detects the change of the video signals.

8. A mobile terminal device according to claim 7, wherein the mobile terminal device is a device driven by a battery, and the controller stops the supply of power from the battery to the corrector when text information is inputted to the input portion.

9. A mobile terminal device according to claim 7, further comprising:

an illumination sensor for detecting illumination;

wherein the controller corrects luminance of the video signal by the corrector in accordance with the illumination detected by the illumination sensor.

10. A mobile terminal device according to claim 7, further comprising:

a color detector which detects colors of light;

wherein the controller executes control so that the corrector changes correction of the video signals in accordance with the kind of the color detected by the color detector.

11. An image processing apparatus comprising:

an input portion to which video signals are inputted;

an illumination sensor for detecting illumination;

a correction portion for correcting the video signals inputted to the input portion; and

a control portion for executing control so that the correction portion corrects the video signals in accordance with distribution of luminance or hue or saturation of the video signals and with illumination detected by the illumination sensor when a characteristic point of the video signal inputted to the input portion changes.