JPH0224370U

JPH0224370U -

Info

Publication number: JPH0224370U
Application number: JP10249788U
Authority: JP
Priority date: 1988-08-01
Filing date: 1988-08-01
Publication date: 1990-02-19

Description

[Brief explanation of drawings]

第１図は本発明の一実施例を示すブロツク図、
第２図は第１図の動作を説明する波形図、第３図
ａ〜ｃは曲面形状におけるカメラより得られた表
面受光レベルの波形図、第４図、第５図は従来未
検出となる表面受光レベルの波形図である。１…ＣＣＤカメラ、２…Ａ／Ｄ変換器、３…画
素シフトレジスタ、４…符号判別付減算回路、５
，１２…比較器、６…欠陥開始設定部、７…画素
シフト（Ｎ）設定部、８…画素アドレスカウンタ
、９，１４…減算器、１０…終了点検出レベル回
路部、１１，１３…レジスタ。 FIG. 1 is a block diagram showing one embodiment of the present invention;
Figure 2 is a waveform diagram explaining the operation of Figure 1, Figures 3 a to c are waveform diagrams of the surface light reception level obtained by the camera in a curved surface shape, and Figures 4 and 5 are conventionally undetected. FIG. 3 is a waveform diagram of the surface light reception level. 1... CCD camera, 2... A/D converter, 3... Pixel shift register, 4... Subtraction circuit with sign discrimination, 5
, 12... Comparator, 6... Defect start setting section, 7... Pixel shift (N) setting section, 8... Pixel address counter, 9, 14... Subtractor, 10... End point detection level circuit section, 11, 13... Register .

Claims

[Scope of utility model registration request]

When detecting a defect in a workpiece having a curved surface shape, if the difference between the light reception level of the current image and the light reception level before a specified pixel in one scanning light reception level of the CCD image sensor is greater than a set value, the point before the specified pixel is considered to be the start of a defect. , again the pixel position where the intermediate level between the current pixel level and the defect start level is detected is defined as the end point of the defect, and the number of pixels between this point is defined as the defect width, thereby detecting the presence or absence of a defect and the size of the defect. A defect detection device characterized by comprising: