China 
Africa 
Explore chapters and articles related to this topic
Displaying Bit-Mapped Images
Published in Julio Sanchez, Maria P. Canton, Software Solutions for Engineers and Scientists, 2018
Julio Sanchez, Maria P. Canton
A bitmap is a form of raster image. A raster image can be defined as pixel-by-pixel enumeration, usually in scan-line order. A bitmap is a formatted raster image encoded according to some predefined standard or convention. A raster image, on the other hand, can be in raw format. For example, a scanning instrument onboard a satellite or space craft acquires and transmits image data in raster form. Once received, the raster data can be processed and stored as bitmaps that can be easily displayed on a computer screen. Television images are in raster form.
Asset Formats
Published in David Austerberry, Digital Asset Management, 2012
Image assets are created either as a bitmap or in vector format. Each has its advantages; it depends on the type of image to be created. Bitmaps, also called raster graphics, represent an image as a regular grid of pixels. Each pixel is given a color value. Bitmaps are used for continuous-tone images like photographs. A bitmap has a fixed number of pixels, so has a fixed resolution. If the image is rescaled, the value of each pixel has to be recalculated. If a bitmapped image is scaled up in size, the image quality will degrade.
An automatic HyLoggerTM mineral mapping method using a machine-learning-based computer vision technique
Published in Australian Journal of Earth Sciences, 2019
J. Liu, W. Chen, M. Muller, S. Chalup, C. Wheeler
Next, an additional suite of drill-core samples with HyLogger scan performed only at the horizontal centre line was selected. This type of HyLogger scan represents the common core-logging process during exploration. As shown in Figure 5, the corresponding digital image of the core-sample group in an identical bitmap format as per stage 1 was also captured. As previously outlined, the HyLogger scan area was formatted in a 4 by 6 mm block size. Therefore, the central strip and the unscanned area of each core could then be segmented into subsequent blocks based on the standard scan block size (Figure 6a). In addition, the centre line HyLogger mineralogy scan results with the three most abundant minerals in each scanning block (identical geometry as per stage 1) are also recorded as per the stage 1 results (Figure 6b).
Development of a bridge maintenance system for prestressed concrete bridges using 3D digital twin model
Published in Structure and Infrastructure Engineering, 2019
Chang-Su Shim, Ngoc-Son Dang, Sokanya Lon, Chi-Ho Jeon
Since image processing is performed and results are obtained in a digital image format, it is possible to apply the image tracing conversion (the so-called raster-to-vector conversion or vectorisation). Basically, an algorithm required for converting a two-dimensional image into its two-dimensional vector representation is applied. An image in a raster graphics environment (bitmap index) is just a collection of pixels, but when mapping to vector graphics, the pixels’ coordinates can be represented by a square-grid coordinate system. Depending on the different R-G-B values of each pixel, points are generated based on that grid itself. The boundary line for the entire mapped points hereafter forms the shape of the crack.
An Improved Reversible Data Hiding for Block Truncation Coding Compressed Images
Published in IETE Technical Review, 2020
Yu-Lun Wang, Min-Shiang Hwang, Jau-Ji Shen
In the AMBTC compressed phase, the mean value of the block calculated by Equation (1) is 145. The high mean and the low mean values calculated by Equations (2) and (3) are 148 and 144, respectively. Then we use Equation (4) to decide the bit 0 or 1 on the bitmap and then send it to the receiver. The right block represents the final bitmap that is calculated from the left block. The receiver gets the bitmap, the high mean value and the low mean value. The recovery phase used is shown in Figure 2.