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| Art form and method of producing same |
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| Segmented hologram for multi-image display |
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| Heads-up and heads-down displays employing holographic stereograms |
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| Seam structure of rubber sheets |
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| Holographic method and apparatus using incoherent light |
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| Method for making a holographic mirror |
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Image reading apparatus
| Details |
Inventors: Toyomura, Yuji; Mizusaki, Masakazu; Kitagawa, Shoichi; Narazaki, Masanobu;
Assignee: Matsushita Electric Industrial Co., Ltd. (Osaka, JP)
Primary Examiner: Grant, II; Jerome
Assistant Examiner: Worku; Negussie
Attorney, Agent or Firm: McDermott, Will & Emery
An image reading apparatus for reading a original line by line, by moving the line image sensor in a direction orthogonal to the line, in which the line sensor is displaced in the line direction in each line to read the image of the original in a checkered pattern of pixels, and for interpolating a pixel in spaces of the said checkered pattern, plural interpolation candidate values for the pixel are determined and one of them is selected according to surrounding pixel values of the said pixel position to be interpolated, thereby reproducing edge portion of the original accurately. |
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DETAILED DESCRIPTION The invention presents a novel method to improve the resolution of the read image, and particularly reproduce edges of the original image at an excellent contrast, which is moving the line image sensor in the main scanning direction reciprocally at the half pixel interval of the original also every time scanning in the sub-scanning direction at the half line interval of the original, reading the image pixels, obtaining a checkered pixel plane of pixels being read, interpolating pixels of spaces in the said checkered pixel plane by utilizing the information of adjacent pixels to the pixels to be interpolated, and so in principle doubling the resolution in both main and sub-scanning directions.
Basically, plural interpolation candidate values for every pixel to be interpolated are calculated with the adjacent pixel values, and one of them is selected and interpolated.
One of its specific methods is a method of calculating the average values of all combinations of two pixels among the four adjacent pixels as the candidate values for every pixel to be interpolated, and selecting and interpolating the candidate value of the combination of two pixels having the minimum difference of the values.
In a modified method, alternatively, combinations of two pixels may be limited in two scanning directions.
For every pixel to be interpolated, in other method, when the direction of the two pixels having the minimum difference among all combinations of two elements of the four adjacent pixels, coincides with the two scanning directions, the candidate value determined from the values of the two pixels is selected, and when the direction of the two pixels differs from the scanning direction, the combination of two pixels is selected by referring to the value of the already interpolated pixel in the direction of the combination of the two pixels, and the candidate value determined from these values is selected and interpolated.
In a further different method, for every pixel to the interpolated, plural candidate values are determined from the values of the four adjacent pixels, and separately using values of several interpolated pixels adjacent to these four adjacent pixels, the predicted value for the pixel to be interpolated is determined, and the candidate value close to this predicted value is selected and interpolated
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Optical Systems 
