Image thumbnails that represent blur and noise
IEEE Transactions on Image Processing
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The image quality of a digital viewfinder is considerably lower than that of a through-the-lens optical system. While the sensor may be capable of capturing 10 or 20 megapixels, the screen of the viewfinder is typically constrained to resolutions under 1 megapixel. The limited resolution makes it impossible to discern all the small details of the captured image. Small blurs and noise that are present in the full-size image can render the image unusable for certain tasks, yet these artifacts may be too small to be discernible in the downsampled version shown on the camera viewfinder.