Image processing apparatus and method
First Claim
1. An image processing apparatus comprising:
- conversion means for converting input digital image data into coefficients based on spatial frequencies to obtain conversion coefficients;
extraction means for extracting a specific area in an image represented by lowest frequency components for a converted image obtained by said conversion means, said specific area being extracted from the converted image by pattern matching between an area having a predetermined color component value range and a predetermined shape; and
quantization means for performing quantization processing on said conversion coefficients of said converted image while changing a quantization characteristic in accordance with the specific area extracted by said extraction means.
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Abstract
A color-space conversion processor converts input digital image data into YUV color space, and a wavelet conversion processor performs wavelet conversion processing on the data. A face-area recognition processor extracts a face area in the image based on the obtained conversion coefficients. A quantization processor performs quantization processing on the input conversion coefficients while changing quantization coefficients used in the quantization processing in and out of the extracted face area. A variable-length coding processor encodes the quantized coefficients. A code synthesizing processor synthesizes the obtained respective color component code data with information indicating the face area extracted by the face-area recognition processor, and outputs the synthesized data as a code string.
52 Citations
27 Claims
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1. An image processing apparatus comprising:
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conversion means for converting input digital image data into coefficients based on spatial frequencies to obtain conversion coefficients;
extraction means for extracting a specific area in an image represented by lowest frequency components for a converted image obtained by said conversion means, said specific area being extracted from the converted image by pattern matching between an area having a predetermined color component value range and a predetermined shape; and
quantization means for performing quantization processing on said conversion coefficients of said converted image while changing a quantization characteristic in accordance with the specific area extracted by said extraction means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
coding means for coding an output from said quantization means; and
output means for synthesizing code data obtained by said coding means with information indicating said specific area obtained by said extraction means, and outputting synthesized information.
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13. The image processing apparatus according to claim 12, wherein the information indicating said specific area comprises a parameter representing a modeled area.
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14. An image processing method comprising:
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a conversion step of converting input digital image data into coefficients based on spatial frequencies to obtain conversion coefficients;
an extraction step of extracting a specific area in an image represented by lowest frequency components for a converted image obtained by the conversion step, said specific area being extracted from the converted image by pattern matching between an area having a predetermined color component value range and a predetermined shape; and
a quantization step of performing quantization processing on said conversion coefficients of the converted image while changing a quantization characteristic in accordance with the specific area extracted at said extraction step. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
a coding step of coding an output from said quantization means; and
an output step of synthesizing code data obtained at said coding step with information indicating said specific area obtained at said extraction step, and outputting synthesized information.
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26. The image processing method according to claim 14, wherein the information indicating said specific area comprises a parameter representing a modeled area.
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27. A storage medium containing a control program for causing a computer to compression-encode digital image data, said control program comprising:
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code of conversion process for converting input digital image data into coefficients based on spatial frequencies to obtain conversion coefficients;
code of extraction process for extracting a specific area in an image represented by lowest frequency components for a converted image obtained by said conversion step, said specific area being extracted from the converted image by pattern matching between an area having a predetermined color component value range and a predetermined shape; and
code of quantization process for performing quantization processing on said conversion coefficients of the converted image while changing a quantization characteristic in accordance with the specific area extracted by said extraction means.
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Specification