EP0326436A2
Expired / Lapsed
EP
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Optimal image-quality selection apparatus
Assignee: NEC Corp
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Filing: 1989-01-30
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Granted: —
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Expires: 2009-01-30
Abstract
Abstract An optimal image-quality selection apparatus includes a quantizer (2) to quantize the image from a scanner. The quantizer outputs video signals (b1, b2) representing the image at different depth levels. Graphic blocks are extracted by extractors (3, 4) and counters (5 - 8) count for each video signal the total number of graphic blocks (e1 and e2) and the number (f1 and f2) of graphics blocks having a predetermined size. Dividers (9, 10) calculate the ratio (f1/e1 and f2/e2 respectively) of the number of graphic blocks having a predetermined size to the number of all graphic blocks of the image for each of the depth levels of colour, and a comparator (11) selects the image having the largest of the ratios as an image of optimal quality.
Inventors
- 👤 Tetsuo Umeda
- 👤 Fumihiko Sugiura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 13:44
CPC Classifications
G; G06; G06V; G06V30/00; G06V30/10; G06V30/16; G06V30/162
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
156 words
An optimal image-quality selection apparatus comprising: means for quantizing a signal representing an image, obtained from a scanner, to output two or more video signals representing the image by different depth levels; means for detecting and counting all the graphic blocks included in each of the two or more video signals, the graphic block being defined as a chain of dots in the image; means for detecting and counting the number of graphic blocks having a predetermined size in each of the two or more video signals; means for calculating a ratio of the number of graphic blocks having the predetermined size to the number of the all graphic blocks included in each of the two or more video signals, respectively; and means for selecting a largest one out of the radios corresponding to the two or more video signals to output a signal representing that a depth level corresponding to the largest ratio is optimal.
Claim 2
Dependent Claim
156 words
An optimal image-quality selection apparatus comprising: means for quantizing a signal representing an image, obtained from a scanner, to output two or more video signals representing the image by different depth levels; means for detecting and counting all the graphic blocks included in each of the two or more video signals, the graphic block being defined as a chain of dots in the image; means for detecting and counting the number of graphic blocks having a predetermined size in each of the two or more video signals; means for calculating a ratio of the number of graphic blocks having the predetermined size to the number of the all graphic blocks included in each of the two or more video signals, respectively; and means for selecting a largest one out of the radios corresponding to the two or more video signals to output a signal representing that a depth level corresponding to the largest ratio is optimal.
Claim 3
Dependent Claim
182 words
An optimal image-quality selection apparatus comprising: means for quantizing a signal output from a scanner into a plurality of video signals having different depth levels of a color; a plurality of block extractors for inputting the plurality of the video signals to extract graphic blocks, respectively; a plurality of pairs of first and second counters connected to said block extractors in one to one correspondence, said first counter counting number of all the graphic blocks and said second counter counting number of graphic blocks having a predetermined size; a plurality of dividers each connected to said a plurality of pairs of said first and second counters in one to one correspondence, each of the plurality of said dividers calculates a ratio of the number of graphic blocks having a predetermined size and the number of all the graphic blocks output from each of the corresponding pairs; and a comparator for comparing the ratios output from the plurality of said dividers to select a largest ratio and outputting a signal representing that an image having the largest ratio has an optimal image quality.
Claim 4
Dependent Claim
182 words
An optimal image-quality selection apparatus comprising: means for quantizing a signal output from a scanner into a plurality of video signals having different depth levels of a color; a plurality of block extractors for inputting the plurality of the video signals to extract graphic blocks, respectively; a plurality of pairs of first and second counters connected to said block extractors in one to one correspondence, said first counter counting number of all the graphic blocks and said second counter counting number of graphic blocks having a predetermined size; a plurality of dividers each connected to said a plurality of pairs of said first and second counters in one to one correspondence, each of the plurality of said dividers calculates a ratio of the number of graphic blocks having a predetermined size and the number of all the graphic blocks output from each of the corresponding pairs; and a comparator for comparing the ratios output from the plurality of said dividers to select a largest ratio and outputting a signal representing that an image having the largest ratio has an optimal image quality.
References Cited (Backward Citations)
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