EP0160363A2
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EP
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Binarizing system of picture image signals
Assignee: Toshiba Corp
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Filing: 1985-03-06
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Granted: —
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Expires: 2005-03-06
Abstract
Abstract in a binarizing system in which analog picture image signals formed by scanning a manuscript with a line sensor undergo quantization and digital picture image signals obtained by the quantization are binarized into signals representing black or white according to a predetermined threshold value, levels of a digital picture image signal of a picture element to be corrected and of a digital picture image signal of a picture element at least one main scanning line before the picture element to be corrected and positioned at the same position as the picture element to be corrected in an auxiliary scanning direction which is attenuated with each main scanning line or lines are compared. Among the above two signals, a signal having a larger level at a given time is used as a reference signal showing the nature of tone of the manuscript. When the level of digital picture image signal of the picture element to be corrected is smaller than the level of the reference signal, the level of the digital picture image signal is decreased. In other cases, the level of the digital picture image signals is maintained. By this operation, the nature of tone of the manuscript is emphasized. Thus, accuracy of judgement in binarizing analog picture image signals is improved. Figure 6.
Inventors
- 👤 Yukio Tsuda
- 👤 Fumio Owada
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 21:39
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/403; G; G06; G06V; G06V10/00; G06V10/20; G06V10/28
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
294 words
A binarizing system of a picture image signal characterised in that there are provided: quantizing means for sequentially quantizing analog picture image signals obtained by scanning a manuscript picture image in accordance with a picture image clock; memory means for temporarily storing the quantized signals for each main scanning line of said manuscript picture image; reading-out means for reading out said temporarily stored signals corresponding to the picture image signals outputted from said quantizing means; first calculating means for-varying levels of the signals read out from said memory means toward a binarized first level direction at each said main scanning line or lines; comparator means for comparing a first signal level of said picture image signals outputted from said quantizing means with a second signal level of the signals read out from said memory means; selecting means which, in response to an output of said comparator means, selects an output signal of said first calculating means when said first signal level is closer to a binarized first level than said second signal level, but selects an output picture image signal ot said quantizing means when said first signal level is closer to a binarized second level than said second signal level; writing means for writing said selected signals into said memory means for updating the same; and second calculating means wnich, in accordance with a third signal level of said signals written into said memory means and said first signal level of said picture image signals outputted from said quantizing means, calculates said first signal level for emphasizing the same toward said binarized first level when said first signal level is closer to said binarized first level than said third signal level thereby binarizing the picture image signals outputted from said second calculating means.
Claim 2
Dependent Claim
294 words
A binarizing system of a picture image signal characterised in that there are provided: quantizing means for sequentially quantizing analog picture image signals obtained by scanning a manuscript picture image in accordance with a picture image clock; memory means for temporarily storing the quantized signals for each main scanning line of said manuscript picture image; reading-out means for reading out said temporarily stored signals corresponding to the picture image signals outputted from said quantizing means; first calculating means for-varying levels of the signals read out from said memory means toward a binarized first level direction at each said main scanning line or lines; comparator means for comparing a first signal level of said picture image signals outputted from said quantizing means with a second signal level of the signals read out from said memory means; selecting means which, in response to an output of said comparator means, selects an output signal of said first calculating means when said first signal level is closer to a binarized first level than said second signal level, but selects an output picture image signal ot said quantizing means when said first signal level is closer to a binarized second level than said second signal level; writing means for writing said selected signals into said memory means for updating the same; and second calculating means wnich, in accordance with a third signal level of said signals written into said memory means and said first signal level of said picture image signals outputted from said quantizing means, calculates said first signal level for emphasizing the same toward said binarized first level when said first signal level is closer to said binarized first level than said third signal level thereby binarizing the picture image signals outputted from said second calculating means.
Claim 3
Dependent Claim
46 words
The binarizing system according to claim 1 wherein said binarized first level is a binary low level, said binarized second level is a binary high level and said calculating means comprises attenuating means for attenuating a level of a signal read out from said memory means.
Claim 4
Dependent Claim
56 words
The binarizing system according to claim 2 wherein said attenuating means comprises a subtraction circuit constituted by a register preset with a desired amount of attenuation at each said unit line or lines, and a subtractor which subtracts said value preset in said register from a value of a signal read out from said memory means.
Claim 5
Dependent Claim
25 words
The binarizing system according to claim 3 wherein said subtractor subtracts said value preset in said register at each one of said main scanning lines.
Claim 6
Dependent Claim
55 words
The binarizing system according to claim 3 wherein said subtraction circuit further comprises means for extracting said value preset in said register during only one main scanning line at each plurality of said main scanning lines, and wherein said subtractor subtracts said value preset in said register at each plurality of said main scanning lines.
Claim 7
Dependent Claim
66 words
The binarizing system according to claim 2 wherein said second calculating means executes a calculation: (calculated signal level) = (tirst signal level) when said first signal level is equal to or larger than said third signal level, whereas when said first signal level is smaller than said third signal level, executes a calculation: (calculated signal level) = 2 x (first signal level) - (third signal level).
Claim 8
Dependent Claim
57 words
The binarizing system according to claim 4 wherein said second calculating means comprises read only memory means in which picture image signals representing signal levels calculated by said calculation aru prestored as a table and wherein said first and third signal levels are used as address informations to read out corresponding picture image signals from said table.
References Cited (Backward Citations)
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