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Free Online OCR is a free service that allows you to easily convert scanned ... If you need powerful and advanced OCR software , please try Smart OCR (www. degree of control over halftone rendering It also permits halftone cells to be arbitrary rectangles, whereas those controlled by a spot function are always square A threshold array is much like a sampled image a rectangular array of pixel values but s de ned entirely in device space Depending on the halftone type, the threshold values occupy 8 or 16 bits each Threshold values nominally represent gray levels in the usual way, from 0 for black up to the maximum (255 or 65,535) for white The threshold array is replicated to tile the entire device space: each pixel in device space is mapped to a particular sample in the threshold array On a bilevel device, where each pixel is either black or white, halftoning with a threshold array proceeds as follows: 1 For each device pixel that is to be painted with some gray level, consult the corresponding threshold value from the threshold array 2 If the requested gray level is less than the threshold value, paint the device pixel black; otherwise, paint it white Gray levels in the range 00 to 10 correspond to threshold values from 0 to the maximum available (255 or 65,535) Note: A threshold value of 0 is treated as if it were 1; therefore, a gray level of 00 paints all pixels black, regardless of the values in the threshold array This scheme easily generalizes to monochrome devices with multiple bits per pixel For example, if there are 2 bits per pixel, each pixel can directly represent one of four different gray levels: black, dark gray, light gray, or white, encoded as 0, 1, 2, and 3, respectively For any device pixel that is speci ed with some inbetween gray level, the halftoning algorithm consults the corresponding value in the threshold array to determine whether to use the next-lower or next-higher representable gray level In this situation, the threshold values do not represent absolute gray levels, but rather gradations between any two adjacent representable gray levels A halftone de ned in this way can also be used with color displays that have a limited number of values for each color component The red, green, and blue components are simply treated independently as gray levels, applying the appropriate threshold array to each (This technique also works for a screen de ned as a spot function, since the spot function is used to compute a threshold array internally). free ocr software online: Mar 23, 2019 · You have surely seen my other article about OCR, here. It uses Microsoft OneNote, which is an app that ... best ocr online Free Online OCR - convert PDF to Word or Image to text
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