Abstract: An apparatus for electrically transmitting the image of a pattern corresponding to the light transmission characteristic of a light-transmitting film substrate employs a linear image sensor for scanning the image of the pattern and producing a corresponding output signal, the frequency band of which is adjusted for transmission over a telephone circuit. The output signal can be made independent of magnification changes of the image-forming optical system, and the area of the pattern scanned by the linear image sensor can be set selectively. A second optical system is employed for observation and includes a retractable mirror that starts the production of the output signal when the mirror is retracted. Both a film image and data on an accompanying document can be transmitted.

Abstract: An image signal generating apparatus includes an optical system for focusing the image of a photographic film onto a predetermined plane and a scanning device for scanning the image with a photoreceptor positioned at the predetermined plane and generating output signals representing the light intensity distribution of the film. The scanning device performs a first scan of the image and a second scan of the image upon completion of the first scan. During the first scan the levels of the output signals indicative of the maximum density and the minimum density of the film are detected, and during the second scan the exposure of the photoreceptor is controlled in accordance with the detected levels. Also, during the second scan, the output signals are clamped to a clamp level calculated in accordance with the detected maximum density level and the minimum level of the output signals during the first scan.

Abstract: An image scanning apparatus for making picture signals has an optical system for forming an image of an object on a predetermined plane and means for scanning the object image by a light-receiving surface disposed on the predetermined plane and generating an output indicative of the light intensity distribution of the object image on the plane.