Image rendition by plural-row error diffusion, for faster operat

Details Image rendition by plural-row error diffusion, for faster operat Image rendition by plural-row error diffusion, for faster operat

1997-01-28

1999-10-26

Coles, Edward L.

Image analysis

Histogram processing

For setting a threshold

395109, 395115, 382237, 382252, 382270, 358496, 358499, 358500, 358501, B41B 1500, G06K 936, G06K 938, H04N 104

Patent

active

059742283

ABSTRACT:
This system and method error-diffuse image data to generate printing decisions; scan and print stages are preferably included. Multiple image-data rows are held in longterm memory, usually external to an integrated circuit that does the processing; preferably data from plural rows at a time are received from that memory. Error from earlier-processed data is also held in longterm memory and fed to the circuit. Longterm-memory access is shared with many other functions; the invention keeps error diffusion from dominating that access. Processing preferably proceeds generally transverse (preferably skewed, ideally at 45.degree.) to data rows, with final error distribution into each pixel when it is the "left pixel" (or when it is the "next pixel" if it is at the top of a row group). For pixels at the top of each run, the circuit retrieves error from, and for pixels at the bottom the circuit deposits error into, longterm memory; for intermediate pixels the circuit does neither--thus amortizing each data access over several pixels. Preferably plural rows are preprocessed to impart a skewed structure and also insert dummy pixels at corners (to simplify repetitive processing)--ideally with data and dummy pixels together forming a parallelogram, the dummy pixels being outboard at both sides of the data. Data can be padded out internally, too, for calorimetric improvement, if correspondingly finer printing resolution is available. In one form of the invention two or more (e. g., four) current pixels are processed simultaneously.

REFERENCES:
patent: 4891710 (1990-01-01), Nakazato et al.
patent: 5121447 (1992-06-01), Tanioka et al.
patent: 5271070 (1993-12-01), Truong et al.
patent: 5553165 (1996-09-01), Webb et al.
patent: 5561536 (1996-10-01), Sugiura et al.
patent: 5604605 (1997-02-01), Moolenaar

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