Image converting apparatus and image converting method

• US 6,181,384 B1
• Filed: 04/03/1998
• Issued: 01/30/2001
• Est. Priority Date: 04/04/1997
• Status: Expired due to Term

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Hayatsu, Yuichi, Nakahashi, Teruyuki, Watanabe, Osamu, Ito, Kazumasa, Kurashige, Masafumi
• Primary Examiner(s): Faile, Andrew I.
• Assistant Examiner(s): BROWN, RUEBEN M
• Application Number:
  US09/055,159
• Time in Patent Office: 1,033 Days
• Field of Search: 348/578, 348/577, 345/430
• US Class Current: 348/577
• CPC Class Codes: G06T 11/001 Texturing; Colouring; Generation of texture or colour inpainting G06T5/77
• CPC Class Codes: H04N 1/60 Colour correction or control H04N1/54 takes precedence
• CPC Class Codes: H04N 9/67 for matrixing camera processing pipelines for matrixing of colour signals H04N23/85

Abstract

An image converting apparatus for converting an image of an input video signal into an image with a metallic luster and representing the metallic luster with parameters designated corresponding to the input image. The apparatus is based on the concept that a model of reflected light can represented with a model of reflected light of diffusion reflection and mirror-surface reflection and that even though the resultant model of reflected light is three-dimensional data, assuming that the brightness of an input video signal linearly varies, the model can be represented with brightness data. A color correction circuit 5 has a look-up table with which calculations for generating an image with a metallic luster are performed with the brightness data and the designated parameters. A matrix calculating circuit extracts a luminous signal component from the input video signal. A pre-modifying circuit adjusts the amplitude. The color correction circuit performs calculations for generating an image with a metallic luster. Mix circuits mix output signals of the color correction circuit with an input video signal.

Claims

1. An image converting apparatus for converting an input image represented by an input video signal into an output video signal representing an image with a metallic luster, comprising:

means for supplying designated parameters representing the metallic luster and corresponding to the input image;

a pre-modifying circuit supplied with a luminous signal component of the input video signal for adjusting the amplitude of the luminous signal component;

a color correction circuit supplied with the amplitude adjusted luminous signal component and the designated parameters for generating color corrected signals representative of a metallic luster, the color correction circuit including a look-up table with which calculations are performed;

mixing circuits for mixing the color corrected signals output from the color correction circuit with the input video signal according to a mix ratio to produce the output video signal representing an image with a metallic luster; and

wherein the mixing circuits produce primary color output signals representing the input image with a metallic luster according to the formulae;

2. An image converting apparatus for converting an input image represented by an input video signal into an output video signal representing an image with a metallic luster, comprising:

means for supplying designated parameters representing the metallic luster and corresponding to the input image;

a pre-modifying circuit supplied with a luminous signal component of the input video signal for adjusting the amplitude of the luminous signal component;

a color correction circuit supplied with the amplitude adjusted luminous signal component and the designated parameters for generating color corrected signals representative of a metallic luster, the color correction circuit including a look-up table with which calculations are performed;

mixing circuits for mixing the color corrected signals output from the color correction circuit with the input video signal according to a mix ratio to produce the output video signal representing an image with a metallic luster; and

wherein the color correction circuit generates output color corrected signals r, g, b representative of a metallic luster according to the formulae;

3. An image converting apparatus for converting an input image represented by an input video signal into an output video signal representing an image with a metallic luster according to claim 2, wherein the values of r, g, b according to the formulae for given designated parameters are stored in the look-up table.

4. An image converting apparatus for converting an input image represented by an input video signal into an output video signal representing an image with a metallic luster according to claim 2, wherein the values of k_R, k_G, and k_B are 1.0, 0.8 and 0.0, respectively, for a gold colored luster.

5. An image converting apparatus for converting an input image represented by an input video signal into an output video signal representing an image with a metallic luster according to claim 2, wherein the values of k_R, k_G, and k_B are 0.8, 0.8 and 1.0, respectively, for a silver colored luster.

6. An image converting apparatus for converting an input image represented by an input video signal into an output video signal representing an image with a metallic luster according to claim 2, wherein the values of k_R, k_G, and k_B are 0.5, 0.5 and 0.5, respectively, for a copper colored luster.

17. An image converting apparatus for converting an input image represented by an input video signal into an output video signal representing an image with a metallic luster according to claim 2, wherein the mixing circuits produce primary color output signals representing the input image with a metallic luster according to the formulae:

7. An image converting apparatus for converting an input image represented by an input video signal into an output video signal representing an image with a metallic luster comprising:

means for supplying designated parameters representing the metallic luster and corresponding to the input image;

a pre-modifying circuit supplied with a luminous signal component of the input video signal for adjusting the amplitude of the luminous signal component;

a color correction circuit supplied with the amplitude adjusted luminous signal component and the designated parameters for generating color corrected signals representative of a metallic luster, the color correction circuit including a look-up table with which calculations are performed;

mixing circuits for mixing the color corrected signals output from the color correction circuit with the input video signal according to a mix ratio to produce the output video signal representing an image with a metallic luster; and

a key processor supplied with the luminous signal component for producing a key signal for controlling the mix ratio of the mixing circuits when the amplitude of the luminous signal component and an edge level of the luminous signal component each exceed predetermined values.

8. An image converting apparatus for converting an input image represented by an input video signal into an output video signal representing an image with a metallic luster according to claim 7, wherein the key processor comprises:

a first subtracting circuit for taking the difference of the luminance component and a signal having a value designated by a user of the apparatus to produce a first difference signal;

an absolute value circuit supplied with the first difference signal for outputting an absolute value of the first difference signal;

a second subtracting circuit for taking the difference of the absolute value of the first difference signal and a signal representing a range of the level to be processed to produce a second difference signal;

a gain adjusting circuit, having a gain determined by a user of the apparatus, is supplied with the second difference signal to produce a gain adjusted output signal;

an adding circuit for combining the gain adjusted output signal with a signal, supplied by the user of the apparatus, representing a value of a mix ratio;

a limiter circuit supplied with an output of the adding circuit for producing an output signal limited to be in the range of the mix ratio;

an inverting circuit supplied with an output from the limiter circuit for inverting a portion to be processed and another portion not to be processed; and

a non-linear converting circuit supplied with an output of the inverting circuit for converting a distribution of the signal level thereof to correspond to a predetermined non-linear conversion curve and outputting the key signal.

9. An image converting method for converting an input image represented by an input video signal into an output video signal representing an image with a metallic luster, comprising the steps of:

supplying designated parameters representing the metallic luster and corresponding to the input image;

adjusting the amplitude of a luminous signal component of the input video signal;

with the amplitude adjusted luminous signal component and the designated parameters, generating by means of a color look-up table, color corrected signals representative of a metallic luster;

mixing the color corrected signals with the input video signal according to a mix ratio to produce the output video signal representing an image with a metallic luster; and

wherein the mixing step produces primary color output signals representing the input image with a metallic luster according to the formulae;

10. An image converting method for converting an input image represented by an input video signal into an output video signal representing an image with a metallic luster, comprising the steps of:

supplying designated parameters representing the metallic luster and corresponding to the input image;

adjusting the amplitude of a luminous signal component of the input video signal;

with the amplitude adjusted luminous signal component and the designated parameters, generating by means of a color look-up table, color corrected signals representative of a metallic luster;

mixing the color corrected signals with the input video signal according to a mix ratio to produce the output video signal representing an image with a metallic luster; and

wherein color correction step generates output color corrected signals r, g, b representative of a metallic luster according to the formulae;

11. An image converting method for converting an input image represented by an input video signal into an output video signal representing an image with a metallic luster according to claim 10, wherein the values of r, g, b according to the formulae for given designated parameters are stored in the look-up table.

12. An image converting method for converting an input image represented by an input video signal into an output video signal representing an image with a metallic luster according to claim 10, wherein the values of k_R, k_G, and k_B are 1.0, 0.8 and 0.0, respectively, for a gold colored luster.

13. An image converting method for converting an input image represented by an input video signal into an output video signal representing an image with a metallic luster according to claim 10, wherein the values of k_R, k_G, and k_B are 0.8, 0.8 and 1.0, respectively, for a silver colored luster.

14. An image converting method for converting an input image represented by an input video signal into an output video signal representing an image with a metallic luster according to claim 10, wherein the values of k_R, k_G, and k_B are 0.5, 0.5 and 0.5, respectively, for a copper colored luster.

18. An image converting method for converting an input image represented by an input video signal into an output video signal representing an image with a metallic luster according to claim 10, wherein the mixing step produces primary color output signals representing the input image with a metallic luster according to the formulae:

15. An image converting method for converting an input image represented by an input video signal into an output video signal representing an image with a metallic luster, comprising the steps of:

supplying designated parameters representing the metallic luster and corresponding to the input image;

adjusting the amplitude of a luminous signal component of the input video signal;

with the amplitude adjusted luminous signal component and the designated parameters, generating by means of a color look-up table, color corrected signals representative of a metallic luster;

mixing the color corrected signals with the input video signal according to a mix ratio to produce the output video signal representing an image with a metallic luster; and

producing a key signal from the luminous signal component for controlling the mix ratio of the mixing circuits when the amplitude of the luminous signal component and an edge level of the luminous signal component each exceed predetermined values.

16. An image converting method for converting an input image represented by an input video signal into an output video signal representing an image with a metallic luster according to claim 15, wherein the key signal producing step comprises:

taking the difference of the luminance component and a signal having a value designated by a user of the method to produce a first difference signal;

outputting an absolute value of the first difference signal;

taking the difference of the absolute value of the first difference signal and a signal representing a range of the level to be processed to produce a second difference signal;

gain adjusting, with a gain determined by a user of the method, the second difference signal to produce a gain adjusted output signal;

combining the gain adjusted output signal with a signal, supplied by the user of the apparatus, representing a value of a mix ratio;

limiting an output of the combining step to be in the range of the mix ratio to produce a range limited signal;

inverting a portion of the range limited signal to be processed and another portion of the range limited signal which is not to be processed; and

non-linear converting a signal resulting from the inverting step for converting a distribution of the signal level thereof to correspond to a predetermined non-linear conversion curve and outputting the result as the key signal.