Image reading apparatus and copying apparatus having means for radiating visible and non-visible light, image processing apparatus having means for discriminating a specific orginal and image processing method therefor

An image reading apparatus which comprises illumination means for radiating both light including a visible component and light including a non-visible component, and detection means for detecting light obtained from an image in accordance with the light radiated from said illumination means, further comprising:

• filter means which can be switched in accordance with whether the visible or non-visible component is radiated from said illumination means onto the image;
• control means for controlling a switching operation of said filter means;
• and
• correction means, having a reference plate, for detecting data obtained upon radiation of light onto said reference plate by said illumination means, and for correcting one or both of said illumination means and said detection means.

A copying apparatus which comprises illumination means for radiating both light including a visible component and light including a non-visible component, detection means for detecting light obtained from an image in accordance with the light radiated from said illumination means, and discrimination means for discriminating based on a detection result of said detection means whether or not a specific image is present, further comprising:

• first filter means which can be switched in accordance with whether the visible or non-visible component is radiated from said illumination means onto the image;
• control means for controlling a switching operation of said filter means;
• and
• second filter means for changing a light component detected by said detection means.

A copying apparatus which comprises illumination means for radiating both light including a visible component and light including a non-visible component, detection means for detecting light obtained from an image in accordance with the light radiated from said illumination means, and discrimination means for discriminating based on a detection result of said detection means whether or not a specific image is present, further comprising:

• filter means which can be switched in accordance with whether the visible or non-visible component is radiated from said illumination means onto the image;
• control means for controlling a switching operation of said filter means;
• and
• correction means, having a reference plate, for detecting data obtained upon radiation of light onto said reference plate by said illumination means, and for correcting one or both of said illumination means and said detection means.