EP0959615A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Color image processing apparatus
Assignee: Canon Inc
•
Filing: 1991-01-16
•
Granted: —
•
Expires: 2011-01-16
Abstract
Abstract A color image processing apparatus for sequentially inputting image data which corresponds to each of a plurality of color components in units of pixels of a predetermined quantity, delaying, with respect to a reference phase, at least the first color component or the last color component and sequentially forming image in the units of pixels of a predetermined quantity in accordance with the delay.
Inventors
- 👤 Akihiro Usami
- 👤 Yoshinori Mochida
- 👤 Atsutomo Yoshizawa
- 👤 Yoshinori Ikeda
- 👤 Kazuhisa Kemmochi
- 👤 Yukio Nagase
- 👤 Shinobu Arimoto
- 👤 Masanori Yamada
- 👤 Hajime Suzuki
- 👤 Katsuhito Kato
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 11:57
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/46; H04N1/52
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
146 words
A color image processing apparatus for forming a color
image by overlapping a plurality of color images each of
which is constituted by a multiplicity of dots,
said color image processing apparatus comprising: input means for inputting image data; and image forming means for forming an image in accordance
with said image data inputted by said input means, said
image forming means setting the period and the phase of a
dot on a line for each of the color images in accordance
with the color and the number of the lines, wherein said image forming means sets the period and
the phase of the dots on said line so as to make a
plurality of adjacent dots of dots the positions of which
are overlapped for at least two colors to be positioned at
the verteces of a substantially regular polygon when color
images are overlapped.
Claim 2
Dependent Claim
127 words
A color image processing apparatus according to Claim
1, wherein said input means inputs image data for each of
color components which is transmitted in a raster
successive manner; and wherein said image forming means comprises: a reference pattern signal generating unit capable of
transmitting reference pattern signals having different
periods corresponding to the color components; a delay circuit for outputting a plurality of pattern
signals having different phases by delaying said reference
pattern signal; a selector for selecting one pattern signal from said
plurality of pattern signals having different phases for
each of lines; and a PWM signal generator for generating a pulse width
modulated (PWM) signal in accordance with said pattern
signal selected by said selector and said image data
inputted by said input means.
Claim 3
Dependent Claim
113 words
A color image processing apparatus comprising: input means for inputting image data corresponding to
color components; and image forming means for forming an image at different
screen angles for each of colors in accordance with image
data for each of color components inputted by said input
means; wherein said image forming means makes a screen angle
by shifting the line directional position of dots by a
predetermined shifting quantity for each of lines, said
predetermined shifting quantity being set in units smaller
than one pixel, and wherein said image forming means forms
an image at a different screen angle for each of colors by
changing the shifting quantity for each of color
components.
Claim 4
Dependent Claim
88 words
A color image processing apparatus according to Claim
3, wherein said input means inputs image data for each
color component which is transmitted in a raster successive
manner, and wherein said image forming means comprises: a pattern signal generator for generating a
predetermined pattern signal; a PWM signal generator for generating a pulse width
modulated (PWM) signal in accordance with said pattern
signal and said image data for each of said color
components; and an image forming unit for forming an image in
accordance with said PWM signal.
Claim 5
Dependent Claim
64 words
A color image processing apparatus according to Claim
4, wherein said pattern signal generator is able to
generate a plurality of pattern signals having different
phases and wherein said pattern signal generator shifts the
phase of said pattern signal by said predetermined quantity
for each of said lines so that an image is formed at a
screen angle which corresponds to a predetermined quantity.
Claim 6
Dependent Claim
28 words
A color image processing apparatus according to Claim
3, wherein said pattern signal generator generates a
pattern signal one period of which corresponds to a
plurality of pixels.
Claim 7
Dependent Claim
97 words
An image processing apparatus comprising: input means for inputting image data transmitted in a
raster successive manner; a pattern signal generator for generating a
predetermined pattern signal; a PWM signal generator for generating a pulse width
modulated (PWM) signal in accordance with image data
inputted by said input means and said predetermined pattern
signal; a delay circuit capable of delaying said PWM signal
generated by said PWM signal generator by different
quantities of delay for each of lines; and an image forming unit for forming an image accordance
with said PWM signal outputted from said delay circuit.
Claim 8
Dependent Claim
18 words
An image processing apparatus according to Claim 7,
wherein said delay circuit randomly sets said quantity of
delay.
Claim 9
Dependent Claim
29 words
A color image processing apparatus according to Claim
7, wherein said delay circuit sets said quantity of delay
in accordance with the color and the line to be recorded.
Claim 10
Dependent Claim
25 words
An image processing apparatus according to Claim 7,
wherein said apparatus makes a screen angle by changing
said quantity of delay for each of lines.
Claim 11
Dependent Claim
21 words
A color image processing apparatus according to Claim
10, wherein said apparatus makes a different screen angle
for each of colors.
Claim 12
Dependent Claim
89 words
A color image processing apparatus comprising: input means for inputting image data; and image forming means for forming an image constituted
by a multiplicity of dots in accordance with image data
inputted by said input means; wherein said image forming means is capable of
shifting the position at which monochromatic dots arranged
on a line are formed in the direction of said line in units
of a shifting quantity which is smaller than one pixel in
accordance with the color of said dots and the position of
said line.
Claim 13
Dependent Claim
37 words
A color image processing apparatus according to Claim
12, wherein said image forming means makes a screen angle
by shifting said position at which said dots are formed by
a predetermined quantity for each of said lines.
Claim 14
Dependent Claim
88 words
A color image processing apparatus according to Claim
13, wherein said input means inputs image data for each
color component which is transmitted in a raster successive
manner, and wherein said image forming means comprises: a pattern signal generator for generating a
predetermined pattern signal; a PWM signal generator for generating a pulse width
modulated (PWM) signal in accordance with said pattern
signal and said image data for each of said color
components; and an image forming unit for forming an image in response
to said PWM signal.
Claim 15
Dependent Claim
63 words
A color image processing apparatus according to Claim
14, wherein said pattern signal generator is able to
generate a plurality of pattern signals having different
phases and, wherein said pattern signal generator shifts
the phase of said pattern signal by a predetermined
quantity for each of said lines so that an image is formed
at a screen angle corresponding to a predetermined
quantity.
Claim 16
Dependent Claim
28 words
A color image processing apparatus according to Claim
13, wherein said pattern signal generator generates a
pattern signal one period of which corresponds to a
plurality of pixels.
Claim 17
Dependent Claim
62 words
Color image forming apparatus which forms a
plurality of superimposed sub-images, each sub-image
comprising a plurality of pixels provided at
predetermined pixel locations, the predetermined pixel
locations for one said sub-image being arranged in
lines across the image at a first angle and the
predetermined pixel locations for another said sub-image
being arranged in lines across the image at a
second angle.
Claim 18
Dependent Claim
109 words
A color image processing apparatus for sequentially
forming an image for each of a plurality of color
components, said image processing apparatus comprising: input means for inputting image data for a plurality
of the color components; and image forming means for sequentially forming each of a
plurality of color, images in accordance with the inputted
image data; wherein said image forming means makes at least either
the screen angle of the image for a color component, which
is formed first, or the screen angle of the image for a
color component, which is formed last, to be different from
the screen angle of the image for another color component.
Claim 19
Dependent Claim
88 words
A color image processing apparatus according to Claim
18, wherein said input means inputs image data for each
color component which is transmitted in a raster successive
manner, and wherein said image forming means comprises: a pattern signal generator for generating a
predetermined pattern signal; a PWM signal generator for generating a pulse width
modulated (PWM) signal in accordance with said pattern
signal and said image data for each of said color
components; and an image forming unit for forming an image in
accordance with said PWM signal.
Claim 20
Dependent Claim
62 words
A color image processing apparatus according to Claim
19,wherein said pattern signal generator is able to
generate a plurality of pattern signals having different
phases and wherein said pattern signal generater shifts the
phase of said pattern signal by a predetermined quantity
for each of said lines so that an image is formed at a
screen angle corresponding to the predetermined quantity.
Claim 21
Dependent Claim
27 words
A color image processing apparatus according to Claim
19,wherein said pattern signal generator generates a
pattern signal one period of which corresponds to a
plurality of pixels.
Claim 22
Dependent Claim
65 words
A color image processing apparatus according to Claim
18,wherein said image forming means forms an image for each
of said color components at a different screen angle from
each other by shifting the position of dots for each of
said lines by a shifting quantity a unit of which is
smaller than one pixel, said shifting quantity being
different from each of said color component.
Claim 23
Dependent Claim
22 words
A color image processing apparatus according to Claim
19,wherein said pattern signal generator generates a
triangular wave signal as said pattern signal.
Claim 24
Dependent Claim
72 words
A color image processing apparatus according to Claim
20,wherein said pattern signal generator comprises: a reference pattern signal generating unit for
generating a reference pattern signal; a delay circuit for outputting a plurality of pattern
signals having different phases by delaying said reference
pattern signal; and a selector for selecting one pattern signal from said
plurality of pattern signals having different phases so as
to supply it to said PWM signal generator.
Claim 25
Dependent Claim
87 words
An image processing apparatus comprising: input means for inputting image data; and binary data generating means for generating binary
data in accordance with the inputted image data and
thresholds which constitute a predetermined threshold
matrix; and image forming means for forming an image in accordance
with said binary data; wherein each threshold of said threshold matrix is
determined so as to make said image formed in accordance
with said binary data to be constituted by dots arranged to
form an elongated shape elongating in a predetermined
direction.
Claim 26
Dependent Claim
28 words
An image processing apparatus according to Claim 25, wherein said threshold matrix is formed by arranging a
plurality of the same or approximate thresholds in a
predetermined direction.
Claim 27
Dependent Claim
57 words
An image processing apparatus according to Claim 25, wherein said apparatus is a color image processing
apparatus, and wherein said image forming means uses a
different threshold matrix for each of said color component
in order to make the directions of dots arranged to form an
elongated shape to be different for each of said color
components.
Claim 28
Dependent Claim
65 words
An image processing apparatus according to Claim 25,
wherein said apparatus is a color image processing
apparatus for sequentially forming an image for each of
said color components, and wherein said image forming means makes the direction
of said dots for a color component which is formed at least
either first or last, to be different from the direction of
dots for another color component.
References Cited (Backward Citations)
No citation records indexed.
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