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Digital Picture Compression and Coding Structure
Published in H.R. Wu, K.R. Rao, Digital Video Image Quality and Perceptual Coding, 2017
Jae Jeong Hwang, Hong Ren Wu, K.R. Rao
The RGB (red, green, and blue) color space is the basic choice for computer graphics and image frame buffers because color CRTs use red, green, and blue phosphors to create the desired color as the three primary additive colors. Individual components are added together to form a color and an equivalent addition of all components produces white. However, RGB is not very efficient for representing real-world images, since equal bandwidths are required to describe all the three color components. The equal bandwidths result in the same pixel depth and display resolution for each color component. Using 8 bits per component requires 24 bits information for a pixel, resulting in 3 times the capacity of the luminance component. Moreover, the sensitivity of the color component of the human eye is less than that of the luminance component. For these reasons, many image coding standards and broadcast systems use luminance and color difference signals. These are, for example, YUV and YIQ for analog television standards and YCbCr for their digital version.
Analog Capture
Published in Syed R. Rizvi, Microcontroller Programming, 2016
Most of us know that the display resolution of a digital television is the number of distinct pixels in each dimension that can be displayed. It is commonly believed that the higher the resolution, the better the quality of the image because more pixels can fit in each dimension. Optical resolution describes the ability of an imaging system to resolve detail in the object that is being imaged. But the resolution that we are concerned about in the discussion of ADC is not optical in nature. It is the resolution that is the relationship of each step to the range. Recall the computation of step voltage (VSTEP). Since we compute the step voltage by dividing the range (in volts) to the total number of steps in that range, we can easily say that step voltage is the resolution of the system in terms of volts. We repeat the VSTEP formula that we discussed earlier. VSTEP=(Range)/(Number of steps)=(VRH−VRL)/(2n)
7 Maintaining Video Quality and Security
Published in Wes Simpson, Howard Greenfield, IPTV and Internet Video:, 2012
Wes Simpson, Howard Greenfield
The resolution of a video image refers to the number of pixels present. Images with higher pixel counts have higher resolution (unless the image has been degraded in some other manner). In IPTV systems, image resolution is normally matched to the display resolution, so an SD signal for an NTSC system would have 720 pixels on each of 480 lines. In Internet video, many different video resolutions are used, ranging from QCIF at 176 × 144 to full HD at 1920 × 1080 pixels and everywhere in between.
Presence: A Review
Published in International Journal of Human–Computer Interaction, 2022
William M. Felton, Russell E. Jackson
Display resolution refers to the level of visual detail provided by the visual display, whereby higher resolution displays provide finer scene acuity (Geng, 2013). Intuitively, higher visual acuity should increase virtual presence, but the effect of resolution on virtual presence is unclear, given that researchers report both significant (Duh et al., 2002) and null findings (Dinh et al., 1999). Lee (2004a) suggests that the null effect of display resolution on virtual presence is reasonable, given that the low acuity of our peripheral vision gives us a tolerance for low resolution visual scenes.