EP0211611A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Image signal coding apparatus
Assignee: Canon Inc
•
Filing: 1986-07-30
•
Granted: —
•
Expires: 2006-07-30
Abstract
Abstract An image signal coding apparatus includes reference and coding line change point detection circuits (106, 107), reference line shift registers (109, 110), a coding line shift register (108), a symbol detection circuit (201). coding and reference line ROM tables - (204 -206), and a code determination circuit (212). The coding line change point detection circuit receives a serial reference line image signal in synchronism with a serial coding line image signal. The reference line shift registers receive serial change point data inthe reference line image signal and output parallel reference line change point data. The coding line shift register receives serial change point data in the coding line image signal and outputs parallel coding line change point data. The symbol detection circuit monitors output states of the reference and coding line shift registers. A run length counter (203) counts the number of pixels between the change points in the coding line image signal. The ROM tables cooperate with the code determination circuit to code the coding line image signal in response to outputs from the symbol detection circuit and the run length counter.
Inventors
- 👤 Katsutoshi Hisada
- 👤 Nobuaki Kokubu
- 👤 Shigeki Sakurai
- 👤 Yukio Murata
- 👤 Tatsuo Okano
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 10:46
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/41; H04N1/411; H04N1/413; H04N1/417; H04N1/4175; G; G06; G06T; G06T9/00; G06T9/005
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
135 words
An image signal coding apparatus comprising: receiving means for receiving a serial reference line image signal in synchronism with a serial coding line image signal; first converting means for inputting serial change point data representing a change point in the reference line image signal received by said receiving means and outputting parallel reference line change point data: second converting means for receiving serial change point data representing a change point in the coding line image signal and outputting parallel coding line change point data; means for monitoring output states of said first and second converting means; means for counting the number of pixels between the change points in the coding line image signal; and coding means for coding the coding line image signal in response to outputs from said monitoring means and said counting means.
Claim 2
Dependent Claim
135 words
An image signal coding apparatus comprising: receiving means for receiving a serial reference line image signal in synchronism with a serial coding line image signal; first converting means for inputting serial change point data representing a change point in the reference line image signal received by said receiving means and outputting parallel reference line change point data: second converting means for receiving serial change point data representing a change point in the coding line image signal and outputting parallel coding line change point data; means for monitoring output states of said first and second converting means; means for counting the number of pixels between the change points in the coding line image signal; and coding means for coding the coding line image signal in response to outputs from said monitoring means and said counting means.
Claim 3
Dependent Claim
25 words
An apparatus according to claim 1, wherein said first and second converting means output parallel image signals having the numbers of pixels required for coding.
Claim 4
Dependent Claim
34 words
An apparatus according to claim 1 or 2, wherein said coding means includes a memory table for receiving the outputs from said monitoring and counting means as address signals and for outputting coded data.
Claim 5
Dependent Claim
96 words
An image signal coding apparatus comprising: receiving means for receiving a reference line image signal in synchronism with a coding line image signal; means for counting the number of pixels between change points in the coding line image signal; means for storing a coding code having a predetermined value when a count of said counting means reaches the predetermined value; means for monitoring a correlation between the coding line image signal and the reference line image signal; and means for determining, according to the correlation, whether the coding code stored in said storing means is effective.
Claim 6
Dependent Claim
96 words
An image signal coding apparatus comprising: receiving means for receiving a reference line image signal in synchronism with a coding line image signal; means for counting the number of pixels between change points in the coding line image signal; means for storing a coding code having a predetermined value when a count of said counting means reaches the predetermined value; means for monitoring a correlation between the coding line image signal and the reference line image signal; and means for determining, according to the correlation, whether the coding code stored in said storing means is effective.
Claim 7
Dependent Claim
26 words
An apparatus according to claim 4, further comprising first coding means for generating the coding code on the basis of the count of said counting means.
Claim 8
Dependent Claim
28 words
An apparatus according to claim 4 or 5, further comprising second coding means for generating the coding code on the basis of an output from said monitoring means.
Claim 9
Dependent Claim
84 words
An image signal coding apparatus comprising: receiving means for receiving a reference line image signal in synchronism with a coding line image signal; means for monitoring a correlation between the coding line image signal and the reference line image signal; and means for coding the coding line image signal on the basis of the correlation; wherein said coding means receives the coding line image signal by the number of pixels required for causing said monitoring means to determine the correlation and then performs coding.
Claim 10
Dependent Claim
84 words
An image signal coding apparatus comprising: receiving means for receiving a reference line image signal in synchronism with a coding line image signal; means for monitoring a correlation between the coding line image signal and the reference line image signal; and means for coding the coding line image signal on the basis of the correlation; wherein said coding means receives the coding line image signal by the number of pixels required for causing said monitoring means to determine the correlation and then performs coding.
Claim 11
Dependent Claim
39 words
An apparatus according to claim 7, further comprising means for counting the number of pixels between the coding line change points, and wherein said coding means performs coding on the basis of outputs from said counting and monitoring means.
Claim 12
Dependent Claim
40 words
An apparatus according to claim 7 or 8, wherein said coding means includes means for storing a signal associated with the coding line image signal by the number of pixels required for causing said monitoring means to determine the correlation.
Claim 13
Independent Claim
36 words
An apparatus according to any of claims 7 to 9, wherein said coding means includes a memory table for receiving an output from said monitoring means as an address signal and for outputting the coding code.
Claim 14
Dependent Claim
116 words
An image signal coding apparatus comprising: receiving means for receiving a reference line image signal in response to a coding line image signal; means for counting the number of pixels between coding line change points; means for monitoring a correlation between the coding line image signal and the reference line image signal; and means for generating a coding code on the basis of an output from said monitoring means; wherein said generating means outputs a start coding code to be generated in correspondence with a given pixel and subsequent codes are output following the start coding code when a plurality of coding codes including the start and subsequent coding codes are output for the given pixel.
Claim 15
Dependent Claim
116 words
An image signal coding apparatus comprising: receiving means for receiving a reference line image signal in response to a coding line image signal; means for counting the number of pixels between coding line change points; means for monitoring a correlation between the coding line image signal and the reference line image signal; and means for generating a coding code on the basis of an output from said monitoring means; wherein said generating means outputs a start coding code to be generated in correspondence with a given pixel and subsequent codes are output following the start coding code when a plurality of coding codes including the start and subsequent coding codes are output for the given pixel.
Claim 16
Dependent Claim
32 words
An apparatus according to claim 11, wherein said generating means includes a memory table for receiving outputs from said monitoring and counting means as address signals and for outputting the coding code.
Claim 17
Independent Claim
35 words
An apparatus according to any preceding claim, wherein said monitoring means monitors a positional relationship between the change point in the coding line image signal and the change point in the reference line image signal.
Claim 18
Dependent Claim
107 words
An image signal coding apparatus comprising: receiving means for receiving a reference line image signal in synchronism with a coding line image signal; first generating means for generating a coding code on the basis of the number of pixels between change points in the coding line image signal; second generating means for monitoring a correlation between the coding line image signal and the reference line image signal and generating a coding code on the basis of the correlation; and selecting means for selecting a coding code according to a predetermined priority order if the coding codes can be simultaneously output from said first and second generating means.
Claim 19
Dependent Claim
107 words
An image signal coding apparatus comprising: receiving means for receiving a reference line image signal in synchronism with a coding line image signal; first generating means for generating a coding code on the basis of the number of pixels between change points in the coding line image signal; second generating means for monitoring a correlation between the coding line image signal and the reference line image signal and generating a coding code on the basis of the correlation; and selecting means for selecting a coding code according to a predetermined priority order if the coding codes can be simultaneously output from said first and second generating means.
Claim 20
Dependent Claim
113 words
An image signal coding apparatus comprising: receiving means for receiving a reference line image signal in response to a coding line image signal; first generating means for generating a coding code on the basis of the number of pixels between change points in the coding line image signal; second generating means for generating the coding code on the basis of a correlation between the coding line image signal and the reference line image signal; page code generating means for generating a code representing an end of a page in a plurality of formats; and termination code generating means for generating a termination code for each line image signal in a plurality of formats.
Claim 21
Dependent Claim
113 words
An image signal coding apparatus comprising: receiving means for receiving a reference line image signal in response to a coding line image signal; first generating means for generating a coding code on the basis of the number of pixels between change points in the coding line image signal; second generating means for generating the coding code on the basis of a correlation between the coding line image signal and the reference line image signal; page code generating means for generating a code representing an end of a page in a plurality of formats; and termination code generating means for generating a termination code for each line image signal in a plurality of formats.
Claim 22
Dependent Claim
37 words
An apparatus according to claim 14 or 15, wherein said second generating means monitors a positional relationship between the change point of the coding line image signal and a change point of the reference line image signal.
Claim 23
Independent Claim
37 words
An apparatus according to any of claims 14 to 16, wherein said first generating means includes a memory table for receiving data representing the number of pixels as an address signal and for outputting a coding code.
Claim 24
Independent Claim
35 words
An apparatus according to any of claims 14 to 17, wherein said second generating means includes a memory table for receiving data representing the correlation as an address signal and for outputting a coding code.
Claim 25
Independent Claim
30 words
An apparatus according to any preceding claim, further comprisinq storage means for storing a previously input coding line image signal and then outputting it as the reference line image signal.
Claim 26
Dependent Claim
104 words
An image signal coding apparatus comprising: means for counting the number of pixels between change points of an input image signal; means for storing a first coding code representing a predetermined value when a count of said counting means reaches a value immediately preceding the predetermined value; and means for generating a second coding code representing a count of said counting means which is smaller than the predetermined value; wherein the first coding code stored in said storing means is read out and, at the same time, the second coding code is generated by said generating means when a change point pixel is detected.
Claim 27
Dependent Claim
104 words
An image signal coding apparatus comprising: means for counting the number of pixels between change points of an input image signal; means for storing a first coding code representing a predetermined value when a count of said counting means reaches a value immediately preceding the predetermined value; and means for generating a second coding code representing a count of said counting means which is smaller than the predetermined value; wherein the first coding code stored in said storing means is read out and, at the same time, the second coding code is generated by said generating means when a change point pixel is detected.
Claim 28
Dependent Claim
36 words
An apparatus according to claim 20, further comprising means for generating the first coding code in response to a signal representing that the count of said counting means reaches the value immediately preceding the predetermined value.
Claim 29
Dependent Claim
24 words
An apparatus according to claim 20 or 21, wherein the predetermined value is 64n (where n_ is an integer of not less than 1).
Claim 30
Dependent Claim
109 words
An image signal coding apparatus comprising: receiving means for receiving a reference line image signal in synchronism with a coding line image signal; means for counting the number of pixels between change points of the coding line image signal; determining means for monitoring a correlation between the coding line image signal and the reference line image signal and determining a coding mode; and means for generating the coding code on the basis of a count of said counting means; wherein an identification code representing a mode determined by said determining means and a start coding code to be generated by said generating means are output as an integral code.
Claim 31
Dependent Claim
109 words
An image signal coding apparatus comprising: receiving means for receiving a reference line image signal in synchronism with a coding line image signal; means for counting the number of pixels between change points of the coding line image signal; determining means for monitoring a correlation between the coding line image signal and the reference line image signal and determining a coding mode; and means for generating the coding code on the basis of a count of said counting means; wherein an identification code representing a mode determined by said determining means and a start coding code to be generated by said generating means are output as an integral code.
Claim 32
Dependent Claim
34 words
An apparatus according to claim 23, wherein said determining means monitors a positional relationship between the change point in the coding line image signal and a change point in the reference line image signal.
Claim 33
Independent Claim
34 words
An apparatus according to claims 23 or 24, wherein said generating means includes a memory table for receiving the count of the counting means as an address signal and for generating the coding codes.
Claim 34
Independent Claim
33 words
An apparatus according to any of claims 23 to 25, further comprising storage means for storing a previously input coding line image signal and then outputting it as the reference line image signal.
Claim 35
Independent Claim
22 words
An apparatus according to any preceding claim, wherein the coding line image signal comprises binary data representing a density of each pixel.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.