Method and apparatus for controlling rapid display of multiple images from a digital image database

Abstract: A digital image processing system for displaying digitized images on a screen of a display unit includes a data base such as a compact disc on which the digitized images are stored, a plurality of image memories for holding the digitized images for display, and a display unit having a screen including a two-dimensional array of pixels. The screen is divided into sections by designating subsets of the screen pixels by row and column, and the images stored in the image memories are allocated to the sections of the screen by mapping image data pixels to the screen pixels. Under user control, different images may be displayed on different sections of the screen. The number of images, and the specific images from the data base, are user selectable and independently manipulable. To reduce a latency time for displaying images responsive to user commands, the images may be arranged in a sequence. Responsive to a user command to load a first image into an image memory and display it, one or more other images adjacent to the first image in the sequence are read from the data base and held in other image memories, otherwise unused. Thus, if a subsequent user command directs the system to display one of the adjacent images, the latency time for reading that image from the data base and holding it in another image memory is reduced.

Description: FIELD OF THE INVENTION: The present invention generally relates to systems for storing and reproducing digitized sound and images, and, in particular, to a system for displaying digitized images responsive to user commands with minimum time delay and for displaying multiple images simultaneously. BACKGROUND OF THE INVENTION : US Patent No. 5,218,455 entitled "Multiresolution Digital Imagery Photofinishing System", by S. Kristy, describes a digital image processing system wherein photographic still images, such as those captured by way of a 35mm camera, are digitized and recorded on an optical compact disc (CD), for subsequent playback on a CD player. Image data files are created by scanning the images on a roll of developed photographic film to produce digitized pixel data for the images, and storing the pixel data as image data files. A relatively permanent digital storage medium, such as an optical disc readable by a laser pickup, is then produced. A user having such a disc loads the disc into a disc player coupled to a display unit such as a video monitor or television. Then, by entering suitable commands into the disc player or a separate control unit, such as an IR remote (hand-held) device, the user displays selected images on the display unit. A low cost, reduced complexity frame store/data retrieval architecture, incorporated into a CD player and which provides for rapid call-up of images stored as digitized image data and display of the images on a consumer television color monitor, is described in United States patent No. 5,270,831 entitled "Mechanism for Controlling Presentation of Displayed Image", by K. Parulski et al. As described in the above-referenced applications, each captured image is digitized by the scanner and stored 'as is', regardless of its orientation on the film. Annexed to each image file is a header file which contains orientation, aspect ratio and other minilab operator-generated information that is readable by the data retrieval microcontroller of a CD player, to control the coupling of the image data to a reproduction device (e.g. TV display). Images are displayed by providing image data residing in an image memory to an output of the apparatus at which a display device is to be coupled. The apparatus maps image data pixels to pixels of a display screen of the display device for correct orientation and aspect ratio. Now, although the above-referenced photo compact disc schemes provide a number of photographic image processing and playback capabilities not heretofore available, it would be desirable to provide additional convenience and flexibility to the user. First, there is inevitably a certain latency time between the time the user enters a command by way of an I/O device (e.g. keyboard, IR remote control unit) to view a selected image, and the time that image actually appears on the display screen. This latency time is largely due to the time required for locating the image data file on disc, reading the image data from the disc, and then loading the read-out image data into the image memory or frame store in the CD player. Typically, this latency time is about 1 to 4 seconds, long enough to be noticeable and inconvenient to the user. It would be desirable to reduce this latency time to a time short enough not to be noticeable to the user. Secondly, some user applications of image display systems involve displaying multiple images, for instance for side-by-side comparison. Medical imaging applications and slide presentations are two applications in which display of two or more images in a side-by-side format is useful. Also, consumers may want to compare images side-by-side, for instance to select a preferred one of several portrait photos of the same person. In addition, the user may wish to browse through a library of images stored on the CD and select plural images for display. U.S. Patent No. 5,021,989 issued June 4, 1991 to Fujisawa et al. shows a system for document browsing. The system includes a long term memory for storing documents, a short term memory for storing a plurality of document pages transferred from the long term memory, a display for displaying the pages in the short term memory, and a controller for browsing through the pages in the short term memory. EP-A- 0 400 503 shows a high speed search system for image data storage that includes an optical disc memory for storing images, a buffer memory for temporarily storing image data files read from the optical disc, and supplying the image data to a display device. DE-A-37 14 172 shows apparatus for document browsing that shows multiple document pages on the same screen at the same time in a first mode, and a bundle of pages on the screen in a second mode. Electro Medica, Siemens, Erlangen, DE, vol. 53, no. 3, 1985, pages 96 - 103 shows a picture archiving and communications system (PACS) having a number of radiological consoles and a direct access image storage system connected to an image communication network. One possible mechanism for displaying multiple images involves redundant playback and display. Unfortunately, the constant complexity of such a scheme would be prohibitive for a consumer or for other users who have budgetary or equipment space limitations. A user of a system which does not support multiple images has to switch back and forth between the images to be displayed and compared, and must repeatedly enter a display command for the images to be played back. The fact that such playback/display commands must be repeatedly entered and that the images are not simultaneously on display are inconvenient to the user. Accordingly, it would be desirable to save the user the inconvenience of entering repeated commands by allowing for simultaneous display of multiple images. SUMMARY OF THE INVENTION : In order to provide the objects and enhancements discussed above, and to provide additional convenience and flexibility to the user, the present invention provides a multiple memory frame store for storing respective ones of a plurality of images to be displayed on a display device as claimed in claim 1 and independent method claim 2 referring to a respective method. BRIEF DESCRIPTION OF THE DRAWINGS: FIG. 1 is a simplified block diagram showing a compact disc data base storage medium, along with a system for generating image data files from images and storing the image data files on the disc, and a system for reading the image data files and displaying the images; FIG. 2 is a partial memory map of the data base of FIG. 1, showing an image data file format including image data and a header; FIG. 3 is a detailed block diagram of the system for reading and displaying an image stored on disc by the system of FIG. 1; FIG. 4 is a front view of a user command input apparatus for use with the system for reading of FIG. 3; and FIGs. 5 through 8 are examples of display unit screens showing various images which are provided in accordance with the invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS: Figure 1 diagrammatically illustrates a photographic color film processing system, such as a photofinishing minilab, for producing a compact disc encoded with image files containing digitized image data. The disc constitutes a data base which is inserted into a compact disc player having the multiple memory storage and access capability in accordance with the invention. It should be observed, however, that the color film processing system of Figure 1 and described here is merely an example of one type of system with which the invention may be used and is not to be considered limitative of the invention. In accordance with the digital image processing system of Figure 1, photographic images, such as a set of twenty-four or thirty-six 36mm x 24mm image frames of a 35mm film strip 10, are scanned by a high resolution opto-electronic film scanner 12, such as a commercially available Eikonix Model 1435 scanner. High resolution scanner 12 outputs digitally encoded data (e.g. a 3072 x 2048 pixel matrix) representative of the internal electronic scanning of a high resolution image sensing array onto which a respective photographic image frame of film strip 10 is projected. This digitally encoded data (digitized image) is coupled in the form of an imaging pixel array-representative bit map to an attendant image processing workstation 14, which contains a frame store and image processing application software through which the digitized image is processed (e.g. enlarged, cropped, subjected to a scene balance correction, etc.) to achieve a desired image appearance. Once an image file has been prepared, it is stored on a transportable data base storage medium, such as a write-once optical compact disc 40, using compact disc recorder 16. The disc 40 may then be inserted into a compact disc player 20 and, via the operation of selector switches of a cabinet-resident control panel or an (IR) remote control unit 200 shown in Figure 4, a selected image file is accessed for display on a display device shown as a television set 22. The CD player may also be coupled to a high resolution thermal printer 24 for obtaining a hard copy of a selected image. In accordance with the image processing system described in the above-referenced Kristy application, each digitized high resolution image is stored as a respective "image pack" data file containing a low (or base) resolution image bit map file, and a plurality of higher resolution residual image files associated with respectively increasing degrees of image resolution. By iteratively combining the higher resolution residual image file data with the low resolution image bit map file data, successively increased resolution images may be recovered from the base resolution image. As an example, spatial data values representative of a high resolution (3072 x 2048) image scan of a 36mm-by-24mm image frame of a 35 mm film strip 10 are stored as a respective image data file including a base resolution image bit map file containing data values associated with a spatial image array of 512 rows and 768 columns of pixels and an associated set of residual image files to be stored on the disc. Within the workstation itself, the base resolution image may be further sub-sampled to derive an even lower resolution sub-array of image values (e.g. on the order of 128 x 192 pixels) for display on a segment of the system operator's workstation for the purpose of identifying image orientation and specifying aspect ratio. Preferably, as described in the above-referenced Parulski et al application, a header file is associated with each digitized image for the purpose of specifying how the image was captured on film and has been correspondingly digitized and stored on disc. The information in the header file is used by the playback device to insure that the image will have an upright orientation and the correct aspect ratio for the reproduction device. In addition, a master header file is recorded which includes a unique ID number for each disc recorded by CD recorder 16 in Figure 1, in order to uniquely identify each disc. When a film strip is originally scanned in the photoprocessing minilab, each picture is digitized as though it were horizontally oriented, irrespective of its actual orientation on the film. The digitized image is stored in the workstation's frame store, as is, and a lower resolution version of the digitized image is displayed on the display monitor of workstation 14, so that the image may be viewed by the operator. As each image is digitized and stored on the disc, the photofinishing minilab operator, using a workstation input device, enters a set of 'presentation' control codes that are incorporated within the header file associated with a respective image file to indicate how the image has been stored, so that, when subsequently accessed by a reproduction device, the image will be played back in an upright orientation at the correct aspect ratio. Referring now to FIG. 2, there is shown an example of the data file arrangement of the data base produced as described above. A memory map of the data base contains a series of image data files. Each image data file includes a header followed by a block of image data. For instance, a first image data file includes a header 21H and image data 21D, a second image data file adjacent to the first image data file includes a header 22H and image data 22D, etc. A preferred format for the headers is shown as a magnification of the header 22H. The header includes several fields, each field containing a designated piece of information. A first field 31 includes an orientation code. In a two-dimensional image, essentially rectangular in shape, any of the four sides could be the bottom. When the film image on the film strip 10 is scanned by the scanner 12, the scan proceeds sequentially through the images on the film strip, without regard to the orientation of the images. However, when recording digital images on the disc, the workstation operator enters a command representative of the orientation of the image, which is stored in an orientation field 31. A second field 33 contains an aspect ratio code. The aspect ratio, or ratio of the height to width of the image, is used to determine what image data decimation or border generation is necessary to make the image fit onto the screen, or what the portion of the screen is allocated for display of the image. Again, an aspect ratio code is entered by the workstation operator at the time the disc is recorded. Figure 3 is a more detailed block diagram of the signal processing architecture of the image retrieval mechanism shown in Figure 1, which allows multiple images to be combined for viewing on a single video display. As in the above-referenced Parulski et al application, the playback device itself is preferably a commercially available compact optical disc player, which accesses digital image files that have been stored on disc and supplies video signals to a user's color television monitor. The contents of the digital image data file read from an optical compact disc 40 by a reader 41, such as a laser pickup, are coupled to a deformatter 42, wherein the file is deformatted into a digitized image and its associated header field, under the control of a resident microcontroller 44. Four image memories, or frame stores, 50 through 53 are shown in the illustrated embodiment of the invention, although a different number of image memories are also usable in accordance with the invention. A respective image is stored in one of the four frame stores 50-53, while the contents of its header field are coupled to a memory access control circuit 55. Memory access control circuit 55 includes a memory controller 46, a column counter 56, and a row counter 58, and controls the transfer of the image data from the disc into one of the frame stores 50-53 and the read-out of the contents of a frame store to associated circuitry including interpolation circuit 59, color and tone modification circuit 57, border generator 55 and a digital-to-analog (D/A) converter 70 for driving a color television display 72. Depending upon the aspect ration code 33 in Figure 2, the memory access control circuitry adjusts the aspect ratio and size of the image eventually supplied by the frame store to the television display. Details of the memory access control architecture are presented in the previously referenced Parulski et al application No. 583,265. Turning now to FIG. 4, the command key layout of a user-operated I/O command unit 200 is shown in the form of a hand-held remote control unit which produces an infrared (IR) beam for communicating user commands to the system. To receive the IR commands from the remote control unit 200, the player (FIG. 3) includes an IR detector 43. Remote control unit 200 is used for entering user commands for selecting images to be displayed, and determining how many images are to be displayed simultaneously. Preferably, unit 200 is of conventional construction and preferably comprises a commercially available infrared remote control transmitter Model No. SAA 3007 manufactured by N.A. Philips Corporation that has a large command programming capacity (e.g. the Model SAA 3007 can accommodate 1280 commands). The key layout may be tailored as desired and in the embodiment shown in Figure 4 includes function keys for multiple memory access in accordance with the invention. The remote control unit microcontroller reads these additional function keys in the same manner as other function keys. In order to facilitate an understanding of the multiple image control feature of the present invention, the following discussion will explain both the operation and the data structure used to assemble respective images and associated parameter fields that are defined in the course of customizing one or a plurality of images. When an optical compact disc onto which digitized image files have been recorded is inserted into the playback device 20 in Figure 1, the presentation of images on the NTSC display 22 is controlled by the user via the IR remote control unit 200, the function key layout of which is shown in greater detail in Figure 4. Individual images are viewed by entering the image number using numerical digit buttons 204 and then pressing a play button 206, or by pressing either a track forward or a track backwards arrow, shown together as 208, to move on to the next or back to the previous image of the sequence of images on the disc 40. The image sequence is preferably a numerical order, such as the order in which the images appeared on the film 10. Therefore, after photofinishing, the numerical sequence on the film and the disc match. The image sequence may alternately be provided from a list of image numbers programmed by the user employing the remote control unit of shown in Figure 4 and stored in an electrically erasable memory contained within the player or located in a removable unit, as described for example in the above-referenced '727 Parulski et al patent application. In accordance with the invention, an initial command for viewing a user selected image causes the image data file for that image to be read from the disc 40, and the image data to be loaded into one of the image memories 50-53. Also responsive to that command, one or more other image data files for images sequentially adjacent to the user selected image are read, and the image data are loaded into one or more other image memories. Accordingly, a subsequent command to display the next or previous image causes the system to display the image already loaded into the other image memory. Latency time is reduced, because the image data is not being read from the disc. In response to the command for the next or previous image, another image prior or subsequent to the image being displayed is read from the disc and loaded into another image memory, where it is ready to be displayed if another command is entered. While there is no way to perfectly predict which image the user will want to display next, in many cases the user scans through the images in sequence, forward or backward. The arrangement discussed here provides an "educated guess" which in many cases accommodates the user's commands while reducing the latency time. The system thus has a better "feel" to the user. As the image data is read from the disc 40, the presentation control data described in the Parulski et al application is used to control the memory access control circuit 46, so that the correctly oriented image is read from framestores 50 through 53. Specifically, image data pixels are mapped to display screen pixels, by row and column numbers. The image is rotated zero degrees by mapping rows of data pixels to rows of screen pixels and columns of data pixels to columns of screen pixels. The image is rotated 90 degrees by mapping rows of data pixels to columns of screen pixels and columns of data pixels to rows of screen pixels in reverse order. The image is inverted or rotated 180 degrees by mapping rows of data pixels to rows of screen pixels in reverse order, and columns of data pixels to columns of screen pixels in reverse order. The image is rotated 270 degrees by mapping rows of data pixels to columns of screen pixels in reverse order, and columns of data pixels to rows of screen pixels in correct order. The images are displayed in accordance with the orientation information in the presentation control file. However, should the orientation code in the presentation control data be in error, due for example to an operator erroneously programming the presentation control data for the particular image in the course of recording the image onto the disc via CD recorder 16 (Figure 1), then the user re-orients the image via rotate buttons 220. The rows and columns of data pixels are decimated as necessary to map the image to the rows and columns of the display screen. The image is cropped by selecting upper and lower intermediate pixel data row and column numbers to define a subset of the image data, and mapping to the screen only those data pixels which fall between the selected intermediate row and column numbers. The user may also zoom in or out to display only a portion of the image in enlarged form by pressing the zoom button 210 followed by either the up/down arrow keys 216, which instruct the memory control circuit 46 to read out the proper portion of the image stored in the appropriate frame store memory (50-53) which is processed by interpolation circuit 59, to provide the pixels of the enlarged image. To zoom the image for greater magnification, the subset is gradually reduced in size by increasing and decreasing the upper and lower intermediate row and column numbers, respectively, incrementally over a period of time during which the user operates the control. To zoom for lesser magnification, the upper and lower row and column numbers are decreased and increased, to increase the size of the subset. The user may also pan through an image in a manner similar to zooming. Panning is either vertical or horizontal. Upper and lower intermediate rows and columns are defined. For horizontal panning, the intermediate row numbers remain constant, and the intermediate column numbers both increase, for left-to-right panning, or decrease, for right-to-left panning, incrementally over the time period in which the user operates the control. In vertical panning, the column numbers remain constant, and the row numbers increase or decrease incrementally. Further, the user may alter the appearance of any displayed image by pressing the 'lighten' button 222 followed by either the up/down arrow key 216, which cause the supply of control codes for increasing or decreasing the contrast of the image, respectively, or the left/right arrow key 218, which increase or decrease the brightness of the image, respectively, by properly operating a color and tone modification circuit 57 to alter the brightness, or contrast of the digitized image as desired. This is done by performing a suitable mathematical transformation on the image data values from the appropriate image memory (50-53), such as increasing all values to increase brightness, increasing or decreasing values for certain colors to change color balance, etc. These transformations are facilitated through the use of digital lookup tables. The user may also alter the color of the displayed image. For this purpose, the user depresses a color button 224, followed by either the up/down arrow key 216, which cause the generation of control codes to increase or decrease the color saturation of the image, or the left/right arrow key 218, which alter the color balance of the image, by instructing the color and tone modification circuit 57 to alter the color of the digitized image by means of a digital 3x3 color correction matrix circuit (not shown). The user also creates a colored border in the image via a color border generator and text generator 55, by first pressing the border button 226 followed by the arrow keys 216 and 218 which allow the border to be properly positioned. The color of the border is changed by pressing the color button 224 and the border button 226 simultaneously, and then pressing the keys 216 to alter the color saturation, or the keys 218 to alter the color hue. A border may be used for filling a portion of the display screen if the preferred aspect ratio of a magnified and panned image differs from that of the display screen. If, for instance, the recomposed image has a preferred width-to-height ratio of 3:1 and the display has a 4:3 ratio, to fit the entire image onto the screen, the image is decimated such that the image width matches the screen width. The height of the image is then less than the screen height. The image pixels are mapped to a subset of the screen, leaving a blank portion of the screen above an upper intermediate row, or below a lower intermediate row. The border, comprising the portion of the screen above the upper intermediate row or below the lower intermediate row, is filled in with the border color. In response to additional user commands, the invention divides the screen into two or more sections, in which different images are simultaneously displayed. Each image within each screen section is independently controllable as described above. In the illustrated system having four image memories 50-53, up to four images may be displayed. The number of images displayed on TV display 72 is controlled by control keys labelled "single" 250, "picture in picture" (P-P) 252, "split" 254 and "QUAD" 256. The display of each individual image is controlled by control keys 260, 262, 264 and 266 in FIG. 4, labelled IMAGE 1 through IMAGE 4. In operation, the user depresses one of the four control keys 250, 252, 254, 256 and then depressed the IMAGE 1 key 260 and selects an image as described above. Depending upon which of the control keys 250, 252, 254 and 256 have been pressed, the user may next depress the IMAGE 2 key 262, of the IMAGE 2 key, IMAGE 3 key 264, and IMAGE 4 key 266 to select the desired images. In alternative embodiments of the invention, there could be a larger number of image memories employed, where having separately numbered keys would be impracticable. In such embodiments, the control device (FIG. 4) has a multiple image key. The user depresses this key, keys in an image number in the numerical keypad, and then proceeds as described above. Turning now to FIGs. 5 through 8, there are shown four examples of a display screen for the display of multiple images in accordance with the invention. For the purpose of discussion, the display unit is a two-dimensional array of pixels arranged as 512 rows x 768 columns. The upper left corner is row 1 and column 1. The upper right corner is row 1 and column 768. The lower left corner is row 512 and column 1. The lower right corner is row 512 and column 768. In FIG. 5, a single image takes up all 512 rows and all 768 columns. The display mode is used when the "single" key 250 is depressed. Rows and columns of image data pixels in a first image memory are mapped to the pixels of the display. If the image data includes more than 512 rows or more than 768 columns, then rows or columns of image data are decimated in a suitable ratio to the total number of rows or columns such that 512 rows and 768 columns remained. In FIG. 6, the user has depressed "split" key 254, which splits the screen into two halves. This is accomplished by establishing a first screen section including columns 1 through 384, and a second section including columns 385 through 768. The image shown in FIG. 5 is shown, in part, in the first screen section of FIG. 6. Of course, the number of columns in the first screen section is less than that of the full screen, so the first image does not fit exactly as in FIG. 5. The image is cropped to fit. Specifically, columns 1 through 192 and 577 through 768 are truncated, leaving columns 193 through 576, the middle portion of the image. The second section of the screen displays a second image. The system also provides other ways of fitting an image into a screen section. For instance, if only the columns of the image are decimated, for instance by 50%, then the image of FIG. 5 would appear to have been distorted (squashed) to fit into the first screen section, which is half as wide. Alternatively, if both rows and columns of the image of FIG. 5 are decimated by 50%, then the image is reduced in size, but is not distorted. Upper and lower borders are visible in the first screen section, above and below the reduced size image. As described above, these border regions are colored in, under user control. Turning now to FIG. 7, the user has depressed "QUAD" key 256, which divides the screen into four quadrants. The screen is divided by column, into columns 1 through 384, and columns 385 through 768, as before. In addition, the screen was divided by row into rows 1 through 256, and rows 257 through 512. Each quadrant has the same relative dimensions as the full screen, so the image of FIG. 5 fits in its entirety, except for row and column decimation to reduce size, into the upper left quadrant. The upper right quadrant contains a second image, which also fits the relative dimensions of the quadrant. The image in the right half of FIG. 6 is a middle section of the image of the upper right quadrant of FIG. 7. The image was originally the same size as that of FIG. 5. It was cropped, as the first image was, to fit into the right half of FIG. 6, and then row and column decimated to fit into the upper right quadrant of FIG. 7. The lower left and right quadrants of the screen each show magnified subsets of the images on the upper left and right quadrants, respectively. In accordance with the invention, each image on each screen section may be manipulated independently by user command, or a plurality of the sections are selected such that a single user command manipulates each of the selected sections the same way. In the illustrated example, central portions of each of the upper images are magnified in the respective lower images. This includes the lower part of the house on the left, and the head of the figure on the right. Magnification includes cropping of the portions of the image not of interest. Also, since a smaller part of the overall image is displayed, less decimation of rows or columns within the portion of interest results in greater detail and finer resolution of the portion of interest. As discussed above, this feature of the invention may be used in medical applications. The upper quadrants may be used to display two X-ray films of a patient taken at different times, between which a tumor developed and grew. To monitor the growth of the tumor, the particular portion of each X-ray film showing the tumor, which would be in the same portion of each film, is magnified by a single user command directed to the lower left and right images. Thus, the two images of the tumor taken at two different times are easily compared, and the context of each image is seen by comparing upper and lower respective images. Turning now to FIG. 8, there is shown another example of how a display screen may be divided to display multiple images. Rather than dividing the screen equally, a small window is inserted near a corner of the display. This is accomplished by selecting a window based on row and column numbers. For instance, in the 512 row by 768 column display shown, the window comprises pixel rows 64 through 192 and pixel columns 512 through 704. The rectangular region defined thus is a window for a more highly decimated secondary image, while the remainder of the screen, including narrow strips above and to the right of the secondary window, are devoted to a primary image. The portion of the primary image data which would fit into the area of the window is simply discarded. The primary and secondary images may be manipulated independently of each other by changing the way in which the image data pixels are mapped to the relevant portions of the screen. This feature is useful, for instance, for finding a first image of interest (displayed as the primary image) and then examining the remaining images one by one (in the secondary window) to locate an image to be viewed concurrently with the primary image. Once the secondary image is located, the user enters commands to change from a primary/secondary display format, as in FIG. 8, to a side-by-side format, such as FIG. 6, and the two images are then compared easily. The steps through which a user may independently display and adjust multiple image will now be described using the QUAD mode in Figure 7. The user first depresses the QUAD control button 256, which divides the display screen into four quadrants as described above. The user next depresses one of the image controls: IMAGE 1 260, IMAGE 2 262, IMAGE 3 264, or IMAGE 4 266. After IMAGE 1 260 is depressed, the user next selects the desired image to be displayed in the upper left display quadrant using controls 204 or 208, as described earlier. Once the desired image 1 is displayed, the user may alter the composition of image 1 using the PAN button 212, ZOOM button 210 or the ROTATE button 220 or may alter the tone or color of the image using the LIGHTEN button 222 or COLOR button 224. These control buttons instruct tone and color modification circuit 57 to alter the tone and color reproduction for only-the upper left quadrant image. The user proceeds to press the IMAGE 2 control 262 and selects the desired image for the upper right quadrant. The user may alter the composition, tone, or color of the upper right image using the controls described earlier. The user proceeds in a similar fashion by pressing the IMAGE 3 button followed by the appropriate controls to obtain the desired image in the lower left quadrant, and finally presses the IMAGE 4 button followed by the appropriate controls to obtain the desired image in the lower right quadrant. The user may also press two or more of the IMAGE 1, 260, IMAGE 2 262, IMAGE 3 264 and IMAGE 4 266 controls in sequence. This applies the subsequent image composition and tone and color operations to the two or more images selected. In the example described earlier relative to Figure 7, the displayed images of the house and person may be generated as follows. The user first depresses the IMAGE 1 control 260 followed by the IMAGE 3 control 264, and then employs controls 204 or 208 to locate and display the house image in both the upper left and lower left quadrants. Next, the user depresses the IMAGE 2 control 262 followed by the IMAGE 4 control 266, and again employs controls 204 or 208 to locate and display the image of the person in both the upper right and lower right quadrants. Finally, the user depresses the IMAGE 3 control 264 followed by the IMAGE 4 control 266, and then uses the zoom control 210 and the pan control 212 to enlarge the same section of the two lower quadrant images by the same amount.

Claims: Digital image storage and display apparatus having a long term memory (40) for storing a sequence of digital image files (21H, 21D - 25H, 25D); a plurality of short term image memories (50 - 53) for temporarily storing digital image files read from the permanent memory (40), an image display (22) for displaying the images in the short term image memories; and control means responsive to an initial command for viewing a user selected image for causing the image data file for that image and one or more other image data files sequentially adjacent to the user selected image to be transferred from the long term memory (40) into the short term memories (50 - 53), characterized by: the short term memories (50 - 53) having the capacity for storing a small number (e.g. 4) of images, and the control means being responsive to a command for displaying the next or previous image, for transferring the image data file for a next or previous image sequentially adjacent to the images in the short term memories (50 - 53) from the long term memory (40) to one of the short term memories (50 - 53). A method for controlling the manner in which a sequence of digital image files (21 H, 21D - 25H, 25D) are accessed from a long term memory (40), stored in a plurality of short term image memories (50 - 53), and displayed on an image display (22), which includes the steps of requesting a selected image to be displayed and transferring the image data file for the selected image and one or more other image data files sequentially adjacent to the selected image from the long term memory (40) to the short term memories (50 - 53), characterized by: the short term memories (50 - 53) having the capacity for storing a small number (e.g. 4 images) of images, and in response to a command for displaying the next or previous image, transferring the image data file for a next or previous image sequentially adjacent to the images in the short term memories (50 -53) from the long term memory (40) to one of the short term memories (50 - 53).

Inventors: FUNSTON DAVID L, PARULSKI KENNETH A, FUNSTON, DAVID L., PARULSKI, KENNETH A., Funston, David L., c/o Eastman Kodak Company, PARULSKI, KENNETH A., C/O EASTMAN KODAK COMPANY
Applicants: EASTMAN KODAK CO, EASTMAN KODAK COMPANY
Application year: 1992
Main classification: G06F17
IPC codes: H04N5, G06F17, G06T3, G11B27, G06T11