Brightness feature information on the brightness of an image to be processed is extracted, and color feature information on the color of the image is extracted. A determination unit determines whether color information of the image to be processed is sufficient. When color information of a reference comparison image is sufficient as a result of determination, a color feature information comparison unit performs a similarity comparison between color feature information of the reference comparison image and that of a target comparison image. When the color information of the reference comparison image is insufficient, a brightness feature information comparison unit performs a similarity comparison between brightness feature information of the reference comparison image and that of the target comparison image. A retrieval result display displays an image serving as a retrieval result on the basis of the comparison result.
Provided is a method of controlling a digital image processing apparatus that displays a histogram showing a number of display cells for each gradation of a displayed image according to the needs of a user. The method includes: displaying a partial area window of a shape selected by a user; moving the partial area window or changing a size of the partial area window according to a manipulation by the user; and displaying the histogram for an entire area of the displayed image and expressing an average brightness value of an area of a current partial area window in the histogram if a confirmation signal for the partial area window is input from by user.
Generation, coding and transmission of an effective video form, scalable portrait video. As an expansion to bi-level video, portrait video is composed of more gray levels, and therefore possesses higher visual quality while it maintains a low bit rate and low computational costs. Portrait video is a scalable video in that each video with a higher level always contains all the information of the video with a lower level. The bandwidths of 2-4 level portrait videos fit into the bandwidth range of 20-40 Kbps that GPRS and CDMA 1X can stably provide. Therefore, portrait video is very promising for video broadcast and communication on 2.5 G wireless networks. With portrait video technology, this system and method is the first to enable two-way video conferencing on Pocket PCs and Handheld PCs.
