Image processing apparatus
First Claim
Patent Images
1. An image processing apparatus comprising:
- receiving means for receiving an encoded orthogonal transform coefficient which is encoded by using a run-length encoding method in units of blocks;
decoding means for decoding the encoded orthogonal transform coefficient;
error detecting means for detecting an error of the encoded orthogonal transform coefficient in the block based on the orthogonal transform coefficient in the block the detected error having a possibility of including a transmission error caused by transmission of the encoded orthogonal transform coefficient through a transmission line; and
correcting means for correcting the detected error detected by said error detecting means.
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Abstract
An image processing apparatus comprises a receiving device for receiving encoded image data which is encoded by using orthogonal transform in a predetermined block unit, an error detecting device for detecting a transmission error of the encoded image data, a correcting device for correcting the transmission error in the predetermined block unit, and a decoding device for decoding the encoded image data and outputting image data for reproducing an image. The image processing apparatus satisfactorily controls the amount of compressed data and prevents a deterioration of image quality even if any error occurs on a transmission path, thereby reproducing good image quality.
47 Citations
19 Claims
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1. An image processing apparatus comprising:
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receiving means for receiving an encoded orthogonal transform coefficient which is encoded by using a run-length encoding method in units of blocks; decoding means for decoding the encoded orthogonal transform coefficient; error detecting means for detecting an error of the encoded orthogonal transform coefficient in the block based on the orthogonal transform coefficient in the block the detected error having a possibility of including a transmission error caused by transmission of the encoded orthogonal transform coefficient through a transmission line; and correcting means for correcting the detected error detected by said error detecting means. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An image processing method comprising the steps of:
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receiving an encoded orthogonal transform coefficient which is encoded by using a run-length encoding method in units of blocks; decoding the encoded orthogonal transform coefficient; detecting an error of the encoded transform coefficient in a block based on the decoded orthogonal transform coefficient in the block, the detected error having a possibility of including a transmission error caused by transmission of the encoded orthogonal transform coefficient through a transmission line; and correcting the detected error detected in said detecting step.
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8. An image processing apparatus comprising:
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input means for inputting image data; transforming means for performing an orthogonal transform on the image data; extracting means for extracting a DC component and an AC component from the transformed image data; adding means for adding data for error detection to at least one of the DC component and the AC component error or an AC component error independently; encoding means for encoding the DC component and the AC component; and output means for outputting the encoded DC component and the encoded AC component to the decoder. - View Dependent Claims (9, 10, 11, 12, 13)
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14. An image processing method comprising the steps of:
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input image data; performing an orthogonal transform on the input image data; extracting a DC component and an AC component from the transformed image data; adding data for error detection to at least one of the DC component and the AC component so that a decoder is able to detect a DC component error or an AC component error independently; encoding the DC component and the AC component; and outputting the encoded DC component and the encoded AC component to the decoder.
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15. An image processing apparatus comprising:
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generating means for generating orthogonal transform coefficients corresponding to image data, the orthogonal transform coefficients including a DC component and an AC component; encoding means for encoding the orthogonal transform coefficients; and adding means for adding data for error detecting to the orthogonal transform coefficients, wherein said adding means includes means for extracting the DC component from the orthogonal transform coefficients and means for adding data for error detection to the DC component. - View Dependent Claims (16, 17, 18)
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19. An image processing method comprising:
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a generating step of generating orthogonal transform coefficients corresponding to image data, the orthogonal transform coefficients including a DC component and an AC component; an encoding step of encoding the orthogonal transform coefficients; and an adding step of adding data for error detection to the orthogonal transform coefficients, wherein said adding step includes a step of extracting the DC component from the orthogonal transform coefficients and a step of adding data for error detection to the DC component.
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Specification