초록 ▼

This specification discloses an image scanning system in which an object image formed by an optical system is electrically scanned by utilization of a photosensor array device and the image scanning output then obtained is quantized to thereby provide quantized image data. According to the improveme

This specification discloses an image scanning system in which an object image formed by an optical system is electrically scanned by utilization of a photosensor array device and the image scanning output then obtained is quantized to thereby provide quantized image data. According to the improvement of the present invention, there are obtained two different quantized image data, namely, first quatized image data quantized by a voltage level determined on the basis of the image scanning output from the sensor device and second quantized image data quantized by a predetermined fixed voltage level.

대표청구항 ▼

In a focusing system, a focus detecting device comprising: (A) signal integration type image scanning means for scanning a detection image of an object onto which the focusing system should be focused and for producing a scanned image signal representative of said detection image, said scanning mean

In a focusing system, a focus detecting device comprising: (A) signal integration type image scanning means for scanning a detection image of an object onto which the focusing system should be focused and for producing a scanned image signal representative of said detection image, said scanning means integrating each signal over a controlled signal integration time; (B) drive means for repetitively driving said image scanning means so that said scanning means repetitively scans said detection image and produces the scanned image signals repetitively; (C) integration control means for controlling, on the basis of each of the scanned image signals repetitively produced by said image scanning means, the signal integration time of said image scanning means in each of the repetitive drives of the scanning means by said drive means, said integration control means including data hold means for successively holding data indicative of the integration time of said scanning means in each of the repetitive drives by said drive means; (D) circuit means for receiving and processing the scanned image signal produced by said scanning means and for detecting the focusing condition of the focusing system onto the object; (E) light emitting display means coupled to said circuit means for displaying the focusing condition of the focusing system onto the object by emitting a light; and (F) display light control means coupled to said display means and said integration control means for controlling the intensity of the display light to be emitted from the display means on the basis of the signal integration time indication data held in said data hold means in said integration control means.