JPH01139671U

JPH01139671U -

Info

Publication number: JPH01139671U
Application number: JP3588088U
Authority: JP
Priority date: 1988-03-18
Filing date: 1988-03-18
Publication date: 1989-09-25

Description

[Brief explanation of the drawing]

第１図は本考案に係る画像読取り装置の一実施
例の構成図、第２図、第３図はそれぞれ補正部の
構成例を示す図、第４図は本実施例の画像読取り
装置の処理流れを示すフローチヤート、第５図ａ
乃至ｃはそれぞれサンプリングデータとその周辺
のデータとを得る例を示す図、第６図ａ乃至ｇは
ＲＡＭＡ，ＲＡＭＣの書込み、読出しの制御を示
すタイムチヤート、第７図ａ，ｂはそれぞれ間引
きデータ間の欠損部を補間する一例を示すための
全体図、部分拡大図、第８図ａは間引きデータ間
の欠損部を補間する他の例を示すための全体図、
第８図ｂ，ｃはそれぞれ第８図ａの部分拡大図、
第９図は第８図ａ乃至ｃの仕方で補間した補正用
データを算出した結果を示す図、第１０図、第１
１図はそれぞれ一般的な画像読取り装置を示す図
、第１２図、第１３図はそれぞれ第１０図、第１
１図の装置におけるコンタクトガラス面上での光
量分布を示す図である。４……補正部、１０……ＲＡＭＡ、１２，１７
……ＣＰＵ、１３……ＲＡＭＣ、１４，１８……
メモリタイミング制御部、１５……ＲＡＭＢ、１
６……シエーデイング補正回路、１９……演算回
路、Ｄ_ｎ，_ｍ……サンプリングデータ、Ｅ_ｎ，_ｍ……周辺のデータ、ＳＤＡＴＡ……補正用データ
。 FIG. 1 is a block diagram of an embodiment of the image reading device according to the present invention, FIGS. 2 and 3 are diagrams each showing an example of the structure of the correction section, and FIG. 4 is the processing of the image reading device of the present embodiment. Flowchart showing the flow, Figure 5a
Figures 6a to 6c are diagrams each showing an example of obtaining sampling data and peripheral data, Figures 6a to 6g are time charts showing control of writing and reading of RAMA and RAMC, and Figure 7a and b are thinning data, respectively. An overall view and partially enlarged view to show an example of interpolating missing parts between thinned data; FIG. 8a is an overall view showing another example of interpolating missing parts between thinned data;
Figures 8b and 8c are partially enlarged views of Figure 8a, respectively;
Figure 9 is a diagram showing the results of calculating the correction data interpolated in the manner shown in Figures 8a to 8c;
Figure 1 is a diagram showing a general image reading device, and Figures 12 and 13 are Figures 10 and 1, respectively.
FIG. 2 is a diagram showing a light amount distribution on a contact glass surface in the device shown in FIG. 1; 4... Correction section, 10... RAMA, 12, 17
...CPU, 13...RAMC, 14,18...
Memory timing control unit, 15...RAMB, 1
6...Shading correction circuit, 19... Arithmetic circuit, _Dn , _m ...Sampling data, _En , _m ...Peripheral data, SDATA...Data for correction.

Claims

[Scope of utility model registration request]

An image comprising means for thinning and storing data for shading correction, and means for performing shading correction based on the thinned data, wherein the thinned data is obtained based on data of a plurality of pixels. reader.