US 4,288,816 AGranted

Compressed image producing system

AssigneeHitachi, Ltd.

InventorsSeiji Kashioka, Yoshihiro Shima, Takafumi Miyatake, Masakazu Ejiri, Osamu Obata

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Abstract

A compressed image producing system is disclosed which comprises a buffer memory unit including a plurality of cascade-connected shift register stages to which image signals time-sequentially produced by the conversion of the respective picture elements of an image into the corresponding binary signals through the scanning of the image are successively applied, a partial image extracting unit including a plurality of registers which take in the image signals from the shift register stages respectively and parallely delivers the image signals bit by bit, and a sampling pulse generating circuit which generates sampling pulses at predetermined intervals. The respective shift registers of the buffer memory perform their data shift operations in response to the sampling pulses to intermittently take in the image signals so that sampling point data corresponding to the scanning lines in number are stored in each register and a plurality of compressed images constructed by different groups of the sampling points are continuously produced through the shifting of the image extracting position.

Claims6

Dependent claims

A compressed image producing system comprising:

a first means for successively scanning a two-dimensional image to convert the image information on the respective scanning lines into picture element signals in synchronism with reference clock pulses;
second means operated by first sampling instruction pulses for the temporary storage of said image signals including a plurality of stages of information storages connected so that said image signals supplied from said first means to a first stage of the information storages are sequentially shifted to following stages of the information storages;
third means operated by second sampling instruction pulses for construction of partial images including a plurality of shift registers provided corresponding to said information storages, said shift registers taking in said image signals from the corresponding information storages in accordance with the input order thereof to parallelly deliver plural-bit image signals;
and
fourth means for generating said reference clock pulses, said first sampling instruction pulses which control said second means so that said image signals from said first means are sampled through predetermined scanning lines for the supplying thereof to said second means and said second sampling instruction pulses which control said third means so that said image signals from said second means are sporadically sampled at a predetermined interval for the supplying thereof to said third means, said fourth means including a control circuit for shifting the timing of the generation of at least one of said first and second sampling instruction pulses in timing with the end of the image scanning operation performed by said first means, whereby for the scannings repeatedly performed on the same image, the image signals relating to the sampled picture elements different from those in the previous scanning are supplied to said third means.

2 more elements

A compressed image producing system comprising:

first means for successively scanning a two-dimensional image to convert the image information on the respective scanning lines into picture element signals and delivering the picture element signals sequentially in synchronism with reference clock pulses;
second means operated by first sampling instruction pulses, whose repetition period is longer than that of said reference clock pulses and shorter than the period of one scanning line for sporadically taking in from said respective scanning lines and temporarily storing a predetermined amount of said picture element signals supplied from said first means, said second means including a plurality of stages of data storages connected so that the picture element signals in a first stage of said data storages are sequentially shifted to following stages of said data storages, each of said data storages having a capacity corresponding to the number of the picture elements included in said one scanning line;
third means operated by second sampling instruction pulses whose generation timing is equal to that of said first sampling instruction pulses for construction of a two-dimensional compressed image signal including a plurality of shift registers provided corresponding to said data storages, each of said shift registers taking in said picture element signals from the corresponding data storage in accordance with the input order thereof to parallelly deliver plural-bit image signals which compose said compressed image;
and
fourth means for supplying said reference clock pulses to said first means and for supplying said first and second sampling instruction pulses to said second means and said third means, respectively, whereby each of said data storages stores plural groups of picture element signals sampled through the different scanning lines and image signals composing different compressed images are periodically delivered from said third means.

2 more elements

A compressed image producing system comprising:

first means for successively scanning a two-dimensional image to convert the image information on the respective scanning lines into picture element signals and delivering the picture element signals sequentially in synchronism with reference clock pulses;
second means operated by first sampling instruction pulses whose repetition period is longer than that of said reference clock pulses for sporadically taking in and temporarily storing predetermined amount of said picture element signals supplied from said first means, said second means including a plurality of stages of data storages;
third means operated by second sampling instruction pulses whose repetition period is equal to that of said first sampling instruction pulses for construction of a two-dimensional compressed image signal including a plurality of shift registers provided corresponding to said data storages, said data storages and said shift registers being connected so that the picture element signals in the data storage of the first stage are sequentially shifted to the data storages of the following stages through the corresponding shift registers and respective pairs of said data storages and said shift registers have a total capacity corresponding to the number of the picture elements included in said one scanning line, each of said shift registers parallelly delivering plural-bit image signals which compose said compressed image;
and
fourth means for supplying said reference clock pulses to said first means and for supplying said first and second sampling instruction pulses to said second means and said third means whereby each of said data storages stores plural groups of picture element signals sampled through the different scanning lines and image signals composing different compressed images are periodically delivered from said third means.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 05/897,133Filed 17 Apr 1978
Priority: JP 52-4355418 Apr 1977
Granted: 8 Sep 1981
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

G06T 3/4007
Scaling of whole images or parts thereof, e.g. expanding or contracting: based on interpolation, e.g. bilinear interpolation
G06V 10/20
Arrangements for image or video recognition or understanding: image preprocessing
G06V 10/32
Image preprocessing: normalisation of the pattern dimensions
G06V 10/36
Image preprocessing: applying a local operator, i.e. means to operate on image points situated in the vicinity of a given point; Non-linear local…