Image processing device, image display device, and image processing method therefor
AssigneeMitsubishi Electric Corporation
InventorsToshiaki Kubo, Satoshi Yamanaka
Life of this patent
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Abstract
It is an object to provide an image processing device, an image display device, and an image processing method therefor that are capable of curbing generation of a pseudo edge in a digital image. The image processing device and the image display device are provided including a threshold-value control unit 29 that obtains a threshold value depending on a tone in image data; a smoothing filter unit 60 that applies a smoothing process to a predetermined tone in the image data while preserving, depending on the threshold value, a predetermined edge in the image data; and an output unit that outputs image data having been processed by the smoothing filter unit 60.
Claims12
An image processing device for interpolating a tone in image data, the image processing device comprising:
- an input unit that inputs the image data;
- a tone transformation unit that performs a tone transformation of the inputted image data;
- a threshold-value control unit that sets a threshold value corresponding to a tone;
- a smoothing filter unit that
- calculates a tone differences between a given pixel and a pixels near said given pixel in the image data that has undergone tone transformation, and
- performs a filtering process in such a way that,
- when the calculated tone difference is larger than the threshold value, then the given pixel is determined to be an edge portion and is not smoothed, and
- otherwise applies a smoothing process to the given pixel;
- and
- an output unit that outputs image data having been processed by the smoothing filter unit,
- wherein the threshold-value control unit sets the threshold value in such a way that a threshold value for a tone in an area where a tone difference in the image data after the tone transformation becomes larger than that in the image data before the tone transformation is at least as large as a threshold value for a tone in an area where the tone difference in the image data after the tone transformation becomes smaller than that in the image data before the tone transformation.
An image display device for interpolating a tone in image data, and for displaying an image whose tone has been interpolated, the image display device comprising:
- a reception unit that generates image data by receiving an image signal;
- a tone transformation unit that performs a tone transformation of the received image data;
- a threshold-value control unit that sets a threshold value corresponding to a tone;
- a smoothing filter unit that
- calculates a tone differences between a given pixel and pixels near said given pixel in the image data that has undergone tone transformation, and
- performs a filtering process in such a way that,
- when the calculated tone difference is larger than the threshold value, then the given pixel is determined to be an edge portion and is not smoothed, and
- otherwise applies a smoothing process to the given pixel;
- and
- a display unit that displays image data having been processed by the smoothing filter unit;
- wherein the threshold-value control unit sets the threshold value in such a way that a threshold value for a tone in an area where a tone difference in the image data after the tone transformation becomes larger than that in the image data before the tone transformation is at least as large as a threshold value for a tone in an area where the tone difference in the image data after the tone transformation becomes smaller than that in the image data before the tone transformation.
An image processing method of interpolating a tone in image data, the method comprising the steps of:
- performing a tone transformation on the image data based on a tone transformation characteristic that has no dimensions;
- setting a threshold value based on the transformation characteristic for a particular tone having been performed by the transformation unit;
- calculating a tone differences between a given pixel and a pixels near said given pixel in the image data that has undergone tone transformation, and
- performing a filtering process in such a way that,
- when the calculated tone difference is larger than the threshold value, then the given pixel is determined to be an edge portion and is not smoothed, and otherwise applying a smoothing process to the given pixel
- applying a smoothing process to a predetermined tone in the image data while preserving, depending on the threshold value, a predetermined edge in the image data;
- and
- outputting the filtered image data after said performing a filtering process;
- wherein said setting a threshold value includes setting the threshold value in such a way that a threshold value for a tone in an area where a tone difference in the image data after the tone transformation becomes larger than that in the image data before the tone transformation is at least as large as a threshold value for a tone in an area where the tone difference in the image data after the tone transformation becomes smaller than that in the image data before the tone transformation.
Dependencies are inferred from the claim text.