JPH01192561A - Image information processing system - Google Patents

Image information processing system

Info

Publication number
JPH01192561A
JPH01192561A JP1720888A JP1720888A JPH01192561A JP H01192561 A JPH01192561 A JP H01192561A JP 1720888 A JP1720888 A JP 1720888A JP 1720888 A JP1720888 A JP 1720888A JP H01192561 A JPH01192561 A JP H01192561A
Authority
JP
Japan
Prior art keywords
correction
data
rom
counter
address
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP1720888A
Other languages
Japanese (ja)
Inventor
Toshio Takagi
高木 登志夫
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toshiba Corp filed Critical Toshiba Corp
Priority to JP1720888A priority Critical patent/JPH01192561A/en
Publication of JPH01192561A publication Critical patent/JPH01192561A/en
Pending legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/315Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material
    • B41J2/32Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads
    • B41J2/35Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads providing current or voltage to the thermal head
    • B41J2/355Control circuits for heating-element selection
    • B41J2/36Print density control

Landscapes

  • Color, Gradation (AREA)
  • Dot-Matrix Printers And Others (AREA)
  • Electronic Switches (AREA)

Abstract

PURPOSE:To lessen irregularity in concentration of a recording image, by establishing a counter for dots of main scan one line contents, a ROM storing a correction coefficient corresponding to a resistance value of a heating element, and a ROM storing a gradation data of one pixel and a correction gradation data corresponding to the correction coefficient. CONSTITUTION:An image data 1 to be recorded has intermediate tone information of one pixel expressed in 8 bits, and is inputted to a reference table ROM 3 as an upper-order address via a latch 2. Besides, a bit counter 5 outputs a counter data 7 corresponding to the image data 1 by input of a shift clock 4. When the counter data 7 is inputted to a resistance value correction ROM 8 as an address, a correction coefficient 9 stored in a corresponding address is outputted, and is inputted to the reference ROM3 as a lower-order address. Thus, a correction image data 10 stored in the address is outputted. Thereafter, this correction value data 10 undergoes gray scale-pulse width conversion and is sent to a thermal head of a recording part, and recording of one line contents is performed. Therefore, irregularity in concentration of a recording image can be lessened.

Description

【発明の詳細な説明】 [発明の目的コ (産業上の利用分#) 本発明は、多値で中間調画家を記録する画鍬記録装置に
おける記録面の濃度ムラを補正する画情報処理方式に関
する。
Detailed Description of the Invention [Purpose of the Invention (Industrial Application #) The present invention provides an image information processing method for correcting density unevenness on a recording surface in a hoe recording device that records a multi-valued halftone image. Regarding.

(従来の技#ン 昇華性染料を用いた熱転写記録方式のカラープリンタ装
置は、記録紙に転写される昇華性染料の量ヲ、サーマル
ヘッドの印加エネルギーを変化させることによってアナ
ログ的に変化させることができるので、中間調の記録に
適している。
(Conventional technology: Color printers using a thermal transfer recording method using sublimable dyes can change the amount of sublimable dye transferred to recording paper in an analog manner by changing the energy applied to the thermal head. This makes it suitable for recording halftones.

しかし、この方法で得られる記録#J慮には、サーマル
ヘッドの発熱素子の抵抗値のバラツキツタめに濃度ムラ
が生じるおそれがある。特に中間調を表現する際には、
この濃度ム2が顕著に現れる。
However, in the recording #J obtained by this method, density unevenness may occur due to variations in the resistance value of the heating element of the thermal head. Especially when expressing midtones,
This density layer 2 appears conspicuously.

この濃度ムラは記録−鐵に対する雑音成分であって、記
録画慮を人間が視覚によシ認識する際は非常な障害とな
る。したがって、このような雑音成分を取除くため、サ
ーマルヘッドの発熱素子の抵抗値のバラツキを小さくす
るための努力が従来よシなされてきたが、これには限界
がある。
This density unevenness is a noise component to the recording material, and is a serious hindrance for humans to visually recognize the recording design. Therefore, in order to remove such noise components, efforts have been made to reduce the variation in the resistance value of the heating element of the thermal head, but there are limits to this.

(発明が解決しようとする課題) 上述の如く、従来はサーマルヘッドの発熱素子の抵抗値
のバラツキをなくすことに限界がめったために、記録画
家の濃度ムラをなくすことができなかった。
(Problems to be Solved by the Invention) As described above, conventionally, there has been a limit to eliminating variations in the resistance value of the heating element of a thermal head, so it has not been possible to eliminate density unevenness in the recording artist.

そこで本発明は、記録画家の濃度ムラを著しく小さくす
ることのできる画情報処理方式を提供することを目的と
する。
SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an image information processing method that can significantly reduce density unevenness of a recording artist.

[発明の構成] (課題を解決するための手段) 本発明は上記課題を解決し目的を達成するために、次の
ような手段を講じた。すなわち、ライン形のサーマルヘ
ッドを有する記録部へ、l#J素ろたシのw1v4デー
タを複数ビットで出力するようにした画情報処理方式に
おいて、主走査1ライン分のドツトをカウントするカウ
ンタと、発熱素子の抵抗値に対応し念補正係数を記憶さ
せたROMと、1画素の階調データと補正係数とに対応
した補正階y4データを記憶させたROMとを具備する
ようにした。
[Structure of the Invention] (Means for Solving the Problems) In order to solve the above problems and achieve the objects, the present invention takes the following measures. In other words, in an image information processing system that outputs w1v4 data of l#J elementary filter in multiple bits to a recording section having a line-shaped thermal head, a counter that counts dots for one main scanning line and a , a ROM that stores a correction coefficient corresponding to the resistance value of the heating element, and a ROM that stores correction gradation y4 data that corresponds to the gradation data and correction coefficient of one pixel.

(作用〕 ら参照テーブルROMK記憶された補正画データを続出
し、この補正画データによって記録紙への記録が行なわ
れるため、簡単な回路構成で記碌画慮の濃度ムラを小さ
くすることができる。
(Function) Since the corrected image data stored in the reference table ROMK is successively stored in the reference table ROMK and recorded on the recording paper using this corrected image data, density unevenness in recording planning can be reduced with a simple circuit configuration. .

(実施例) 以下、本発明の画情報処理方式を中間調画像を記録する
プリンタ装置に適用した例について説明する。第1図は
本発明の画情報処理方式の一実施例の回路構成を示すブ
ロック図である。1は記録すべき画データであって、1
画素の中間調情報が8ビツトで表現されている。この画
データ1はラッチ2を介して参照テーブルROM 3に
上位アドレスとして入力される。4はシフトクロックで
あシ、ラッチ2およびビットカウンタ5にクロックとし
て入力される。6はラインスタート信号であシ、ピクト
カウンタ5にクリア信号として入力される。ビットカウ
ンタ5の出力であるカウンタデータ7は、抵抗値補正R
OM Bにアドレスとして入力される。この抵抗値補正
ROM Bにはサーマルヘッドの発熱素子の抵抗値のバ
ラツキによる発熱量のバラツキを補正するように設定さ
れた補正係数が記憶されておシ、ピットカウンタ5から
与えられたアドレスの内容を出力する。この抵抗値補正
ROM Bから出力され念補正係数9は参照テーブルR
OM 3 K下位アドレスとして入力される、参照チー
グルROM 、?には補正#iデータが記憶されており
、ラッチ2および抵抗値補正ROM Bから与えられた
アドレスの内容、すなわち補正画データ1oを出力する
。参照テーブルROM Jおよび抵抗値補正ROM &
には、後述するようにして求められた値が記憶されてい
る。
(Embodiment) An example in which the image information processing method of the present invention is applied to a printer device that records halftone images will be described below. FIG. 1 is a block diagram showing the circuit configuration of an embodiment of the image information processing method of the present invention. 1 is image data to be recorded, and 1
Halftone information of pixels is expressed in 8 bits. This image data 1 is inputted to the reference table ROM 3 via the latch 2 as an upper address. 4 is a shift clock, which is input to the latch 2 and the bit counter 5 as a clock. 6 is a line start signal, which is input to the pictogram counter 5 as a clear signal. Counter data 7, which is the output of bit counter 5, is subjected to resistance value correction R.
It is input to OMB as an address. This resistance value correction ROM B stores a correction coefficient set to correct the dispersion in the amount of heat generated due to the dispersion in the resistance value of the heating element of the thermal head, and stores the contents of the address given from the pit counter 5. Output. The correction coefficient 9 output from this resistance value correction ROM B is referenced in table R.
Reference Cheagle ROM, ?, entered as OM3K lower address? Correction #i data is stored in , and outputs the contents of the address given from latch 2 and resistance value correction ROM B, that is, corrected image data 1o. Reference table ROM J and resistance value correction ROM &
stores a value determined as will be described later.

・補正係数 基準となる発熱素子に加えられるエネルギーEoは、電
圧ヲv、基準抵抗値を80.基準ノeルス幅を1、とす
ると、 E  −(V/R0)・t で与えられる。したがって、抵抗値Rのときのエネルギ
ーEは、 g=(V/R)@t となる。E=E  とすると、 t=(R/RO)・to となる。つまり、抵抗値のバラツキを補正するには、パ
ルス幅をR/R8倍すれば良いことが分る。このR/R
0が補正係数である。
・The energy Eo applied to the heating element, which is the reference for the correction coefficient, is determined by setting the voltage to OV and the reference resistance value to 80. If the reference Norse width is 1, it is given by E - (V/R0)·t. Therefore, the energy E when the resistance value is R is g=(V/R)@t. If E=E, then t=(R/RO)・to. In other words, it can be seen that in order to correct the variation in resistance value, it is sufficient to multiply the pulse width by R/R8. This R/R
0 is the correction coefficient.

・補正画データ まず画データ1から対応する印加エネルギーEを求める
。そして補正印加エネルギーE′をE/=(R/R0)
・Eとして求める。次にE′に対応する階調データを求
め、これを補正画データとする。
- Corrected image data First, the corresponding applied energy E is determined from image data 1. Then, the corrected applied energy E' is E/=(R/R0)
・Calculate as E. Next, tone data corresponding to E' is obtained and used as corrected image data.

次に動作について説明する。まず、1ライン分の画デー
タ1が送られてくるのに先立ってラインスタート信号6
がビットカウンタ5のクリアi子に入力され、ビットカ
ウンタ5がリセットされる。
Next, the operation will be explained. First, before one line of image data 1 is sent, a line start signal 6 is sent.
is input to the clear i terminal of the bit counter 5, and the bit counter 5 is reset.

続いて1247分の画データ1がシフトクロック4と同
期がとられてラッテ2へ送られ、ラッチされた後、参照
テーブルROM 3に上位アドレスとして入力される。
Subsequently, 1247 minutes of image data 1 is synchronized with the shift clock 4, sent to the latte 2, latched, and then inputted to the reference table ROM 3 as an upper address.

一方、ピットカウンタ5はシフトクロック40人力によ
って画データ1に対応した数であるカウンタデータ7を
出力する。カウンタデータ7は抵抗値補正ROM 8に
アト“レスとして入力され、このカウンタデータ7に対
応したアドレスに記憶された補正係数9が出力され、参
照テーブルROM 3に下位アドレスとして入力される
。このようにして画データ1と補正係数9とが参照テー
ブルROM 3にアドレスとして入力され、このアドレ
スに記憶された補正画データ10が出力される。この補
正画データ10はこの後、階調−パルス幅変換を施され
、記録部のサーマルヘッドへ送られ、1ライン分の記録
が行なわれる。
On the other hand, the pit counter 5 outputs counter data 7, which is a number corresponding to the image data 1, by the manual shift clock 40. The counter data 7 is inputted as an address into the resistance value correction ROM 8, and the correction coefficient 9 stored at the address corresponding to this counter data 7 is outputted and inputted into the reference table ROM 3 as a lower address. The image data 1 and the correction coefficient 9 are input as an address to the reference table ROM 3, and the corrected image data 10 stored at this address is output. The data is converted and sent to the thermal head of the recording section, where one line of recording is performed.

なお本発明は上記実施例に限定されるものではなく、本
発明の要旨を逸脱しない範囲で種々変形実施可能である
のは勿論である。
Note that the present invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

[発明の効果コ 本発明によれば、ライン形のサーマルヘッドを有する記
録部へ1画素あたりの階調データを複数ピットで出力す
るようにした画情報処理方式において、主走査1ライン
分のドツトをカウントするカウンタと、発熱素子の抵抗
値に対応した補正係数を記憶させたROMと、1画素の
階調データと補正係数とに対応した補正階調データを記
憶させたROMとを具備するようにしたので、記録画家
の濃度ムラを著しく小さくすることのできる画情報処理
方式を提供できる。
[Effects of the Invention] According to the present invention, in an image information processing method in which gradation data per pixel is output as a plurality of pits to a recording section having a line-shaped thermal head, dots for one main scanning line can be output. , a ROM that stores a correction coefficient corresponding to the resistance value of the heating element, and a ROM that stores correction gradation data corresponding to the gradation data of one pixel and the correction coefficient. Therefore, it is possible to provide an image information processing method that can significantly reduce density unevenness of a recording artist.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明による画情報処理方式の一実施例の回路
構成を示すブロック図である。 1・・・画データ、2・・・ラッチ、3・・・参照テー
ブルROM、4・・・シフトクロック、5・・・ビット
カウンタ、6・・・ラインスタート信号、7・・・カウ
ンタデータ、8・・・抵抗値補正ROM、9・・・補正
係数、10・・・補正画データ。
FIG. 1 is a block diagram showing the circuit configuration of an embodiment of the image information processing method according to the present invention. 1... Image data, 2... Latch, 3... Reference table ROM, 4... Shift clock, 5... Bit counter, 6... Line start signal, 7... Counter data, 8... Resistance value correction ROM, 9... Correction coefficient, 10... Correction image data.

Claims (1)

【特許請求の範囲】[Claims] ライン形のサーマルヘッドを有する記録部へ1画素あた
りの階調データを複数ビットで出力するようにした画情
報処理方式において、主走査1ライン分のドットをカウ
ントするカウンタと、発熱素子の抵抗値に対応した補正
係数を記憶させたROMと、1画素の階調データと補正
係数とに対応した補正階調データを記憶させたROMと
を具備したことを特徴とする画情報処理方式。
In an image information processing method that outputs gradation data per pixel in multiple bits to a recording unit having a line-shaped thermal head, a counter that counts dots for one main scanning line and a resistance value of a heating element are used. An image information processing system comprising: a ROM that stores correction coefficients corresponding to the gradation data of one pixel and a ROM that stores correction gradation data that corresponds to the gradation data of one pixel and the correction coefficient.
JP1720888A 1988-01-29 1988-01-29 Image information processing system Pending JPH01192561A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1720888A JPH01192561A (en) 1988-01-29 1988-01-29 Image information processing system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1720888A JPH01192561A (en) 1988-01-29 1988-01-29 Image information processing system

Publications (1)

Publication Number Publication Date
JPH01192561A true JPH01192561A (en) 1989-08-02

Family

ID=11937522

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1720888A Pending JPH01192561A (en) 1988-01-29 1988-01-29 Image information processing system

Country Status (1)

Country Link
JP (1) JPH01192561A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03227261A (en) * 1990-02-01 1991-10-08 Victor Co Of Japan Ltd Thermal recording device
EP0512475A2 (en) * 1991-05-09 1992-11-11 Seiko Epson Corporation Circuit for controlling energizing of heating elements
EP0627319A1 (en) * 1993-05-28 1994-12-07 Agfa-Gevaert N.V. Method for correcting across-the-head unevenness in a thermal printing system
US5796420A (en) * 1993-05-28 1998-08-18 Agfa-Gevaert Method for correcting across-the-head uneveness in a thermal printing system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03227261A (en) * 1990-02-01 1991-10-08 Victor Co Of Japan Ltd Thermal recording device
EP0512475A2 (en) * 1991-05-09 1992-11-11 Seiko Epson Corporation Circuit for controlling energizing of heating elements
US5308958A (en) * 1991-05-09 1994-05-03 Seiko Epson Corporation Circuit for controlling energizing of heating elements
EP0627319A1 (en) * 1993-05-28 1994-12-07 Agfa-Gevaert N.V. Method for correcting across-the-head unevenness in a thermal printing system
US5796420A (en) * 1993-05-28 1998-08-18 Agfa-Gevaert Method for correcting across-the-head uneveness in a thermal printing system

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