Visual processing apparatus, visual processing method, program, recording medium, display device, and integrated circuit

• US 8,401,324 B2
• Filed: 01/31/2011
• Issued: 03/19/2013
• Est. Priority Date: 04/28/2006
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Corporation of America (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Ito, Takeshi, Yamashita, Haruo, Monobe, Yusuke
• Primary Examiner(s): Allison, Andrae S
• Application Number:
  US13/017,380
• Publication Number:
  US 20110122148A1
• Time in Patent Office: 778 Days
• Field of Search: 382/165, 382/167, 382/190, 382/199, 382/219, 382/220, 382/250, 382251-252, 382255-256, 382260-266, 348/607, 348/610, 348/615, 348/622, 348/625, 348/627, 358/3.26, 358/3.27, 358/532, 358/537, 358/540, 358/463, 358/464
• US Class Current: 382/254
• CPC Class Codes: G06T 2207/20012 Locally adaptive
• CPC Class Codes: G06T 2207/20192 Edge enhancement; Edge preservation
• CPC Class Codes: G06T 5/75 Unsharp masking
• CPC Class Codes: H04N 5/142 Edging; Contouring
• CPC Class Codes: H04N 5/20 Circuitry for controlling amplitude response

Abstract

It is possible to inhibit side effects even when an image that has sharp edge regions has been input, using a spatial processing portion (10) outputting surrounding image information US from an input image signal, a control signal generation portion (40) outputting an effect adjustment signal MOD according to a degree of flatness of an edge proximal region, and an effect adjustment portion (20) outputting a synthesized signal MUS that is synthesized by changing a ratio of the image signal IS and the surrounding image information US according to the effect adjustment signal MOD. Further, the side effects are inhibited using a visual processing portion (30) visually processing the image signal IS based on the synthesized signal MUS and the image signal IS.

Claims

1. A visual processing device, comprising:

a spatial processing portion operable to output a processed signal generated by performing predetermined spatial processing on an input image signal based on information from a plurality of pixels surrounding a target pixel of the input image signal; and

a visual processing portion operable to perform visual processing using the input image signal and the processed signal, and operable to output an output signal as a result of the visual processing, the visual processing being performed using the input image signal and the processed signal output by the spatial processing portion, so as to enhance a local contrast of the input image signal,

wherein the visual processing portion reduces an effect of the enhancement of the local contrast with respect to a flat region in the input image signal, the flat region being proximal to a detected edge of the input image signal.

2. The visual processing device according to claim 1, wherein the flat region, which is proximal to the detected edge of the input image signal, is determined by detecting an edge of an unsharp signal of the input image signal.

3. The visual processing device according to claim 2, wherein the unsharp signal is the processed signal output by the spatial processing portion.

4. An image display device, comprising:

a spatial processing portion operable to output a processed signal generated by performing predetermined spatial processing on an input image signal based on information from a plurality of pixels surrounding a target pixel of the input image signal;

a visual processing portion operable to perform visual processing using the input image signal and the processed signal, and operable to output an output signal as a result of the visual processing, the visual processing being performed using the input image signal and the processed signal output by the spatial processing portion, so as to enhance a local contrast of the input image signal; and

a display portion operable to display the output signal,

wherein the visual processing portion reduces an effect of the enhancement of the local contrast with respect to a flat region in the input image signal, the flat region being proximal to a detected edge of the input image signal.

5. A television device comprising:

a reception portion operable to receive a video signal;

a decoding portion operable to decode the video signal and output an image signal;

a spatial processing portion operable to output a processed signal generated by performing predetermined spatial processing on the image signal based on information from a plurality of pixels surrounding a target pixel of the image signal;

a visual processing portion operable to perform visual processing using the image signal and the processed signal, and operable to output an output signal as a result of the visual processing, the visual processing being performed using the image signal and the processed signal output by the spatial processing portion, so as to enhance a local contrast of the image signal; and

a display portion operable to display the output signal,

wherein the visual processing portion reduces an effect of the enhancement of the local contrast with respect to a flat region in the image signal, the flat region being proximal to a detected edge of the image signal.

6. A portable information terminal device, comprising:

a reception portion operable to receive a video signal;

a decoding portion operable to decode the video signal and output an image signal;

a spatial processing portion operable to output a processed signal generated by performing predetermined spatial processing on the image signal based on information from a plurality of pixels surrounding a target pixel of the image signal;

a visual processing portion operable to perform visual processing using the image signal and the processed signal, and operable to output an output signal as a result of the visual processing, the visual processing being performed using the image signal and the processed signal output by the spatial processing portion, so as to enhance a local contrast of the image signal; and

a display portion operable to display the output signal,

wherein the visual processing portion reduces an effect of the enhancement of the local contrast with respect to a flat region in the image signal, the flat region being proximal to a detected edge of the image signal.

7. A camera, comprising:

an imaging portion operable to capture an image and generate an image signal;

a spatial processing portion operable to output a processed signal generated by performing predetermined spatial processing on the image signal based on information from a plurality of pixels surrounding a target pixel of the image signal;

a visual processing portion operable to perform visual processing using the image signal and the processed signal, and operable to output an output signal as a result of the visual processing, the visual processing being performed using the image signal and the processed signal output by the spatial processing portion, so as to enhance a local contrast of the image signal; and

a display portion operable to display the output signal,

wherein the visual processing portion reduces an effect of the enhancement of the local contrast with respect to a flat region in the input image signal, the flat region being proximal to a detected edge of the image signal.

8. A visual processing method, comprising:

a spatial processing step of outputting a processed signal generated by performing predetermined spatial processing on an input image signal based on information from a plurality of pixels surrounding a target pixel of the input image signal; and

a visual processing step of performing visual processing using the input image signal and the processed signal, and outputting an output signal as a result of the visual processing, the visual processing being performed using the input image signal and the processed signal output by the spatial processing step, so as to enhance a local contrast of the input image signal,

wherein the visual processing step includes reducing an effect of the enhancement of the local contrast with respect to a flat region in the input image signal, the flat region being proximal to a detected edge of the input image signal.

9. An integrated circuit used for an image output device, executing:

a spatial processing step of outputting a processed signal generated by performing predetermined spatial processing on an input image signal based on information from a plurality of pixels surrounding a target pixel of the input image signal; and

a visual processing step of performing visual processing using the input image signal and the processed signal, and outputting an output signal as a result of the visual processing, the visual processing being performed using the input image signal and the processed signal output by the spatial processing step, so as to enhance a local contrast of the input image signal,

wherein the visual processing step includes reducing an effect of the enhancement of the local contrast with respect to a flat region in the input image signal, the flat region being proximal to a detected edge of the input image signal.

10. A non-transitory computer-readable storage medium having an image processing program stored thereon, the image processing program for performing a visual processing by a computer, and the image processing program causing the computer to execute a visual processing method comprising:

a spatial processing step of outputting a processed signal generated by performing predetermined spatial processing on an input image signal based on information from a plurality of pixels surrounding a target pixel of the input image signal; and

a visual processing step of performing visual processing using the input image signal and the processed signal, and outputting an output signal as a result of the visual processing, the visual processing being performed using the input image signal and the processed signal output by the spatial processing step, so as to enhance a local contrast of the input image signal,

wherein the visual processing step includes reducing an effect of the enhancement of the local contrast with respect to a flat region in the input image signal, the flat region being proximal to a detected edge of the input image signal.