Scene change detector for digital video
First Claim
1. A method for detecting a scene change between a prior video picture and a current video picture, comprising the steps of:
- determining average luminance values of a block pair of said prior and current video pictures;
determining an incremental visual sensation value using a difference between said average luminance values;
determining a minimum of said average luminance values of said current and prior picture blocks, wherein;
if said minimum exceeds a dark scene threshold, said incremental visual sensation value is determined using the ratio of (a) the absolute value of said difference, and (b) said minimum;
if said minimum does not exceed a dark scene threshold, said incremental visual sensation value is determined using the ratio of (a) the absolute value of said difference, and (b) said dark scene threshold; and
if said incremental visual sensation value exceeds a block contrast threshold level, a scene change is indicated.
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Accused Products
Abstract
In a method for detecting a scene change between a prior video picture and a current video picture of a sequence of pictures, an average luminance value is determined for a block pair of the prior and current video pictures. Preferably, the blocks of the block pair are located, respectively, in the same relative position in the prior and current pictures. An incremental visual sensation value is determined using a difference between the average luminance values. If the incremental visual sensation value exceeds a block contrast threshold level, a scene change is indicated. In particular, if the minimum of the average luminance values of the current and prior picture blocks exceeds a dark scene threshold, the incremental visual sensation value is determined using the ratio of (a) the absolute value of the difference between the average luminance values, and (b) the minimum of the average luminance values of the current and prior picture blocks. Otherwise, the incremental visual sensation value is determined using the ratio of (a) the absolute value of the difference, and (b) the dark scene threshold. The method may be optimized by adjusting the block size based on the relative amount of motion and the current picture type.
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Citations
19 Claims
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1. A method for detecting a scene change between a prior video picture and a current video picture, comprising the steps of:
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determining average luminance values of a block pair of said prior and current video pictures; determining an incremental visual sensation value using a difference between said average luminance values; determining a minimum of said average luminance values of said current and prior picture blocks, wherein; if said minimum exceeds a dark scene threshold, said incremental visual sensation value is determined using the ratio of (a) the absolute value of said difference, and (b) said minimum; if said minimum does not exceed a dark scene threshold, said incremental visual sensation value is determined using the ratio of (a) the absolute value of said difference, and (b) said dark scene threshold; and if said incremental visual sensation value exceeds a block contrast threshold level, a scene change is indicated. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An apparatus for detecting a scene change between a prior video picture and a current video picture, comprising:
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means for determining average luminance values of a block pair of said prior and current video pictures; means for determining an incremental visual sensation value using a difference between said average luminance values; means for determining a minimum of said average luminance values of said current and prior picture blocks, wherein; if said minimum exceeds a dark scene threshold, said incremental visual sensation value is determined using the ratio of (a) the absolute value of said difference, and (b) said minimum; if said minimum does not exceed a dark scene threshold said incremental visual sensation value is determined using the ratio of (a) the absolute value of said difference, and (b) said dark scene threshold; and if said incremental visual sensation value exceeds a block contrast threshold level, a scene change is indicated. - View Dependent Claims (8, 9, 10, 11)
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12. A method for detecting a scene change between a prior video picture and a current video picture, comprising the steps of:
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determining average luminance values of a block pair of said prior and current video pictures; determining an incremental visual sensation value using a difference between said average luminance values; determining a relative amount of motion between said blocks of said block pair; and adjusting a size of said blocks based on said relative amount of motion;
wherein;if said incremental visual sensation value exceeds a block contrast threshold level, a scene change is indicated. - View Dependent Claims (13, 14, 15)
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16. An apparatus for detecting a scene change between a prior video picture and a current video picture, comprising:
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means for determining average luminance values of a block pair of said prior and current video pictures; means for determining an incremental visual sensation value using a difference between said average luminance values; means for determining a relative amount of motion between said blocks of said block pair; and means for adjusting a size of said blocks based on said relative amount of motion;
wherein;if said incremental visual sensation value exceeds a block contrast threshold level, a scene change is indicated. - View Dependent Claims (17, 18, 19)
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Specification