| 摘要 |
In a terminal device such as a portable consumer electronic device, the device having only limited computational memory, a large compressed image file such as a JPEG file, having some color depth such as 24 bits per pixel, is collapsed to a bit-mapped image file with very little color depth, such as 1 bit per pixel. This collapse may be carried out in situ in the computational memory of the device. The bit-mapped image will be of some large row-and-column pixel count. A display mechanism within the device may then display a window (within the bit-mapped image) of a row-and-column pixel count that is smaller than that of the bit-mapped image. For purposes of this display the bit¬ mapped information to be displayed may be of a color depth of two and maybe mapped back to a 24-bit color space to accommodate the display hardware and/or firmware. In this way, a human user can perform a quality-assurance review upon a photograph of high pixel count even though the system may have only very limited computational memory and only limited display size, all with application response time consistent with the expectations of the human user. |
