JPH08216380A - Inspecting apparatus of printing quality - Google Patents
Inspecting apparatus of printing qualityInfo
- Publication number
- JPH08216380A JPH08216380A JP7021534A JP2153495A JPH08216380A JP H08216380 A JPH08216380 A JP H08216380A JP 7021534 A JP7021534 A JP 7021534A JP 2153495 A JP2153495 A JP 2153495A JP H08216380 A JPH08216380 A JP H08216380A
- Authority
- JP
- Japan
- Prior art keywords
- light quantity
- image data
- printing paper
- light amount
- difference
- 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.)
- Withdrawn
Links
Landscapes
- Inking, Control Or Cleaning Of Printing Machines (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、印刷品質検査装置に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a print quality inspection device.
【０００２】[0002]
【従来の技術】従来の印刷品質検査装置は、図３に示す
ように印刷紙面の白紙部１１を検出部のカメラにより画
像データとして取込み、その部分の明るさを予め設定し
ている基準照度値と比較して、その結果に基づき照明用
光源体の光量を補正することにより、検出部で必要とし
ている照度を得るようにしている。2. Description of the Related Art A conventional print quality inspection apparatus, as shown in FIG. 3, takes in a blank sheet portion 11 of a printing paper surface as image data by a camera of a detection portion and sets a brightness of the portion as a reference illuminance value which is preset. In comparison with the above, the illuminance required by the detection unit is obtained by correcting the light amount of the illumination light source body based on the result.
【０００３】[0003]
【発明が解決しようとする課題】前記図３に示す従来の
印刷品質検査装置では、光量補正のための白紙部１１が
印刷紙面に存在することを前提条件にしている。しかし
ながら印刷紙面によっては、白紙部分のないものもあ
り、その場合、光量補正を行うことができない。また光
量補正に必要な白紙部分が絵柄の近くに存在する場合、
機械の振動などにより、位置がずれた場合、白紙部分以
外の印刷部分の光量を読み込むことがあり、このような
状態で光量補正を行うと、補正後の検出部における光量
が不安定になるという問題があった。The conventional print quality inspection apparatus shown in FIG. 3 is premised on that the blank sheet portion 11 for correcting the light quantity is present on the printing sheet surface. However, depending on the printing paper surface, there may be a blank paper portion, and in that case, the light quantity cannot be corrected. Also, if the white paper part necessary for light quantity correction is near the design,
When the position is misaligned due to machine vibration, etc., the light amount of the printed part other than the blank part may be read, and if the light amount correction is performed in such a state, the light amount of the corrected detection part becomes unstable. There was a problem.
【０００４】本発明は前記の問題点に鑑み提案するもの
であり、その目的とする処は、白紙部分のない印刷紙
面に対しても光量補正を行うことができ、補正後の検
出部における光量を安定化でき、単価の高い印刷紙の
場合、印刷紙代を低減できる印刷品質検査装置を提供し
ようとする点にある。The present invention is proposed in view of the above problems, and an object of the present invention is to make it possible to perform light amount correction even on a printing paper surface without a blank portion, and to correct the light amount in the detection unit after correction. It is an object of the present invention to provide a print quality inspection device capable of stabilizing the printing cost and, in the case of printing paper with a high unit price, reducing the printing paper cost.
【０００５】[0005]
【課題を解決するための手段】上記の目的を達成するた
めに、本発明は、照明用光源体により印刷紙面を照明
し、検出部のカメラにより印刷紙面の画像データを取り
込んで、この画像データにより印刷品質の良否を判定す
る印刷品質検査装置において、前記カメラにより取り込
んだ画像データの中から複数の最大光量画素を選定して
これらの画素位置を決定保持する最大光量画素検出回路
と、同各最大光量画素の平均値を求める光量値平均回路
と、上記平均値と予め設定している光量の基準値とを比
較してその差分を求める差分回路とを具えている。In order to achieve the above object, the present invention illuminates a printing paper surface with an illuminating light source, captures image data on the printing paper surface with a camera of a detecting unit, and uses this image data. In a print quality inspection device that determines the quality of print quality by means of a maximum light amount pixel detection circuit that selects and holds a plurality of maximum light amount pixels from the image data captured by the camera, and the same, and A light amount value averaging circuit for obtaining an average value of the maximum light amount pixels and a difference circuit for comparing the average value with a preset reference value of the light amount and obtaining a difference therebetween are provided.
【０００６】[0006]
【作用】本発明の印刷品質検査装置は前記のように構成
されており、照明用光源体により印刷紙面を照明し、検
出部のカメラにより印刷紙面の画像データを取り込ん
で、この画像データにより印刷品質の良否を判定する
際、最大光量画素検出回路により、上記取り込んだ画像
データの中から複数の最大光量画素を選定して、これら
の画素位置を決定保持し、光量値平均値回路により、各
最大光量画素の平均値を求め、差分回路により、上記平
均値と予め設定している光量の基準値とを比較して、そ
の差分を求め、この差分をパラメータとして電圧値変化
量を求め、この電圧値変化量により照明用光源体の光量
を補正して、検出部で最適な照明条件を得る。The print quality inspection apparatus of the present invention is configured as described above. The light source for illumination illuminates the print paper surface, the camera of the detection unit takes in the image data of the print paper surface, and prints with this image data. When determining quality, the maximum light amount pixel detection circuit selects a plurality of maximum light amount pixels from the captured image data, determines and holds these pixel positions, and the light amount value average value circuit Obtain the average value of the maximum light amount pixel, the difference circuit, by comparing the average value with a preset reference value of the light amount, the difference is obtained, the voltage value change amount is obtained using this difference as a parameter, The light amount of the illumination light source body is corrected by the amount of change in the voltage value, and the detection unit obtains the optimum illumination condition.
【０００７】[0007]
【実施例】次に本発明の印刷品質検査装置を図１に示す
一実施例により説明すると、１がカメラ等を有する検出
部、２が同検出部１のカメラにより取り込んだ画像デー
タの中から複数の最大光量画素を選定してこれらの画素
位置を決定保持する最大光量画素検出回路、３が同各最
大光量画素の平均値（現在値）Ｌｗを求める光量値平均
回路、４が上記平均値（現在値）Ｌｗと予め設定してい
る光量の基準値Ｌｔとを比較してその差分ΔＬを求める
差分回路である。DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a print quality inspection apparatus of the present invention will be described with reference to an embodiment shown in FIG. 1. 1 is a detection unit having a camera or the like, and 2 is image data captured by the camera of the detection unit 1. A maximum light amount pixel detection circuit for selecting a plurality of maximum light amount pixels and determining and holding these pixel positions, a light amount value averaging circuit for obtaining an average value (current value) Lw of each maximum light amount pixel, and 4 for the average value It is a difference circuit that compares the (current value) Lw with a preset reference value Lt of the light amount and obtains the difference ΔL.
【０００８】次に前記図１に示す印刷品質検査装置の作
用を具体的に説明する。印刷状態が安定した時点で、検
出部１のカメラにより基準画となる画像データを取り込
む。この画像データの全ての画素のうち、最大輝度値を
もつ複数の画素を最大光量画素検出回路２により選定す
る。さらにこれらの画素の中から予め設定した個数の画
素だけを選定して、これらの画素を注目画素９（図２参
照）とする。Next, the operation of the print quality inspection apparatus shown in FIG. 1 will be specifically described. When the printing state becomes stable, the camera of the detection unit 1 takes in image data as a reference image. Among all the pixels of this image data, a plurality of pixels having the maximum brightness value are selected by the maximum light amount pixel detection circuit 2. Further, only a preset number of pixels are selected from these pixels, and these pixels are set as the target pixel 9 (see FIG. 2).
【０００９】この注目画素９の輝度値とその近くの複数
の画素（以下、周辺画素と称する）の輝度値とを比較
し、これら輝度値の差分が予め設定している閾値内に納
まるとき、その注目画素９を最大光量画素とする。しか
し、これらの輝度値の差分がその閾値内に納まらないと
き、その注目画素９は、雑音などの影響を包括するデー
タとみなして、最大光量画素とはしない。このようにし
て決定された最大光量画素の位置は保持される。The brightness value of the pixel of interest 9 is compared with the brightness values of a plurality of pixels (hereinafter referred to as peripheral pixels) near the pixel of interest, and when the difference between these brightness values falls within a preset threshold value, The target pixel 9 is set as the maximum light amount pixel. However, when the difference between these luminance values does not fall within the threshold value, the pixel of interest 9 is regarded as data including the influence of noise and the like and is not set as the maximum light amount pixel. The position of the maximum light amount pixel determined in this way is retained.
【００１０】印刷紙面の検査時には、検出部１のカメラ
により画素データを逐次取り込み、この画素データの中
から前述の最大光量画素の位置に該当する画素を選び出
し、光量値平均回路３によりこれら最大光量画素から輝
度の平均値Ｌｗを求め、この輝度の平均値Ｌｗを現在光
量値として、差分回路４へ導き、ここで輝度の平均値Ｌ
ｗと予め設定している光量の基準値（光量の目標値）Ｌ
ｔとを比較して、差分ΔＬ（Ｌｔ−Ｌｗ）を求め、この
差分ΔＬをパラメータとして電圧値変化量ΔＶを求め、
この電圧値変化量ΔＶにより照明用光源体の光量を補正
して、検出部１で最適な照明条件を得るようにする。At the time of inspecting the printing paper surface, the camera of the detection unit 1 sequentially takes in pixel data, selects a pixel corresponding to the position of the maximum light amount pixel from the pixel data, and the light amount value averaging circuit 3 selects the maximum light amount. The average value Lw of the brightness is obtained from the pixel, and the average value Lw of the brightness is set as the present light amount value and guided to the difference circuit 4, where the average value L of the brightness is obtained.
w and a preset reference value of light quantity (target value of light quantity) L
The difference ΔL (Lt−Lw) is calculated by comparing with t, and the voltage value change amount ΔV is calculated using this difference ΔL as a parameter.
The light amount of the illumination light source body is corrected by this voltage value change amount ΔV so that the detection unit 1 obtains the optimum illumination condition.
【００１１】[0011]
【発明の効果】本発明の印刷品質検査装置は前記のよう
に照明用光源体により印刷紙面を照明し、検出部のカメ
ラにより印刷紙面の画像データを取り込んで、この画像
データにより印刷品質の良否を判定する際、最大光量画
素検出回路により、上記取り込んだ画像データの中から
複数の最大光量画素を選定して、これらの画素位置を決
定保持し、光量値平均値回路により、各最大光量画素の
平均値を求め、差分回路により、上記平均値と予め設定
している光量の基準値とを比較して、その差分を求め、
この差分をパラメータとして電圧値変化量を求め、この
電圧値変化量により照明用光源体の光量を補正して、検
出部で最適な照明条件を得るので、白紙部分のない印刷
紙面に対しても光量補正を行うことができる。As described above, the printing quality inspection apparatus of the present invention illuminates the printing paper surface by the light source for illumination, takes in the image data of the printing paper surface by the camera of the detection unit, and judges whether the printing quality is good or bad by this image data. When determining, the maximum light amount pixel detection circuit selects a plurality of maximum light amount pixels from the captured image data, determines and holds these pixel positions, and the light amount value average value circuit determines each maximum light amount pixel. Of the average value of, the difference circuit, by comparing the average value and the reference value of the preset light amount, to obtain the difference,
The voltage value change amount is obtained using this difference as a parameter, and the light amount of the illumination light source body is corrected by this voltage value change amount to obtain the optimum illumination condition in the detection unit. Light quantity correction can be performed.
【００１２】また白紙部分以外の印刷部分の光量を読み
込むことがなくて、補正後の検出部における光量を安定
化できる。また印刷品質検査の際、印刷紙の白紙部分を
不要にできるので、単価の高い印刷紙の場合、印刷紙代
を低減できる。Further, it is possible to stabilize the light quantity of the corrected detecting portion without reading the light quantity of the printed portion other than the blank paper portion. In addition, since it is possible to eliminate the white paper portion of the printing paper during the print quality inspection, the printing paper cost can be reduced in the case of a printing paper with a high unit price.
【図１】本発明の印刷品質検査装置の一実施例を示す系
統図である。FIG. 1 is a system diagram showing an embodiment of a print quality inspection apparatus of the present invention.
【図２】同印刷品質検査装置での画像データの構成を示
す説明図である。FIG. 2 is an explanatory diagram showing a configuration of image data in the print quality inspection apparatus.
【図３】従来の印刷品質検査時の印刷紙面を示す平面図
である。FIG. 3 is a plan view showing a printing paper surface in a conventional print quality inspection.
１ カメラ等を有する検出部 ２ 最大光量画素検出回路 ３ 光量値平均回路 ４ 差分回路 1 Detection unit having a camera, etc. 2 Maximum light intensity pixel detection circuit 3 Light intensity value averaging circuit 4 Difference circuit
Claims (1)
検出部のカメラにより印刷紙面の画像データを取り込ん
で、この画像データにより印刷品質の良否を判定する印
刷品質検査装置において、前記カメラにより取り込んだ
画像データの中から複数の最大光量画素を選定してこれ
らの画素位置を決定保持する最大光量画素検出回路と、
同各最大光量画素の平均値を求める光量値平均回路と、
上記平均値と予め設定している光量の基準値とを比較し
てその差分を求める差分回路とを具えていることを特徴
とした印刷品質検査装置。1. A printing paper surface is illuminated by a light source for illumination,
In the print quality inspection device that captures the image data on the printing paper surface by the camera of the detection unit and determines the quality of the print quality based on this image data, select a plurality of maximum light intensity pixels from the image data captured by the camera. A maximum light amount pixel detection circuit that determines and holds these pixel positions,
A light amount value averaging circuit for obtaining the average value of each maximum light amount pixel,
A print quality inspecting apparatus, comprising: a difference circuit that compares the average value with a preset reference value of the amount of light to obtain a difference therebetween.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7021534A JPH08216380A (en) | 1995-02-09 | 1995-02-09 | Inspecting apparatus of printing quality |
| DE19604241A DE19604241C2 (en) | 1995-02-09 | 1996-02-06 | Device for checking the print quality |
| US09/045,099 US6081608A (en) | 1995-02-09 | 1998-03-20 | Printing quality examining method |
| US09/496,846 US6373966B1 (en) | 1995-02-09 | 2000-02-02 | Print quality examining apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7021534A JPH08216380A (en) | 1995-02-09 | 1995-02-09 | Inspecting apparatus of printing quality |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08216380A true JPH08216380A (en) | 1996-08-27 |
Family
ID=12057636
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7021534A Withdrawn JPH08216380A (en) | 1995-02-09 | 1995-02-09 | Inspecting apparatus of printing quality |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08216380A (en) |
-
1995
- 1995-02-09 JP JP7021534A patent/JPH08216380A/en not_active Withdrawn
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20020507 |