Hitachi HV-D25 operation manual Realtime Auto White, Auto Shading Correction

Realtime Auto White

The camera detects a white part in the image by itself, and its internal microcomputer automatically adjusts white balance in realtime. Use this function in case that the color temperature varies with time (e.g., from morning to day to night).

1. In the MENU mode, set up WHITE BAL:AUTO.

(Note 1) If the color temperature of the scene being taken is changed abruptly (when the camera is oriented from indoor side to outdoor side), the image may become bluish or reddish momentarily. This phenomenon is not a symptom of trouble, however. Immediately after it, the optimum white balance condition is set.

(Note 2) If adjusted under a light source that has a flicker component, such as fluorescent or mercury, the white balance accuracy can be impaired. Change the electronic shutter mode (Sub-menu 1 Shutter or Variable) setting to reduce flicker before engaging the auto white balance adjustment.

Where the camera is mounted fixedly and the orientation and image-taking range of the camera remain unchanged. it is advisable to use the white gate function in combination for attaining higher accuracy in white balance.

1.In the MENU mode, set up WHITE GATE:ON.

2.Using the WHITE GATE menu in the MENU mode, bring the display window to a monochrome part (white or gray part) in the image.

For details of the WHITE GATE function, refer to p. 18. Be sure to set the WHITE GATE window to a white or gray part in the image. Do not set it to a colored part.

Auto Shading Correction

Color shading may occur in the vertical direction on screen due to any characteristic of lens. This camera is equipped with a function for correcting color shading automatically.

1.Provide a proper aperture value of lens using the auto iris function or manually.

2.Take an white image fully on screen. At this step, take care so that uneven brightness will not occur in the vertical direction.

3.In the DIRECT mode, press the AWB button. White balance is adjusted automatically.

4.In the MENU mode, carry out AUTO SHADING. Thus, color shading in the image is corrected automatically.

(Note 1) When using the camera for the first time or after replacing the lens, just be sure above instructions.

(Note 2) If adjusted under a light source that has a flicker component, such as fluorescent or mercury, the white balance accuracy can be impaired. Change the electronic shutter mode (Sub-menu 1 Shutter or Variable) setting to reduce flicker before engaging the auto white balance adjustment.

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