We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.
Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.
THREE-DIMENSIONAL MOTION PICTURES will not be detected by the eye and the Image will appear sharp. The circles of confusion are not separated from each other but overlap throughout the whole image surface and therefore it Is seldom, If ever, necessary to have recourse to the very smallest obtainable disc of confusion for obtaining a so-called perfectly sharp image. The smallness of the opening of the camera obscura limits to a great extent the quantity of light that is admitted into It and therefore the luminosity of the image is extremely low, but the image presents the great advantage of being a perfect re production of the object as to ratio of sizes and therefore as to perspective. Also, if the object is composed of several planes succeeding each other, as is the general case in any landscape or scene, all the different planes are imaged upon the single image plane with the same degree of sharpness or, in other words, with an infinite depth of focus. Thus the camera ob scura may be said to give undistorted ideally true Image? These attributes of the camera obscura have been put to good use In laboratory experiments where the trueness of the Image Is more Important than its luminosity and also in the re production of subjects such as architectural motives, where the absence of distortion and the rendition of true perspective are essentials. THE virtual images formed by mirrors for the very fact that they cannot be collected upon a screen, cannot provoke the chemical changes in the photographic emulsion which are the cause of the permanent photographic image. The real images formed by mirrors are used in photographic