EP0323194A2
Expired / Lapsed
EP
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Electronic still camera and image recording method thereof
Assignee: Toshiba Corp
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Filing: 1988-12-23
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Granted: —
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Expires: 2008-12-23
Abstract
Abstract An electronic still camera includes an imaging device (20, 26), a signal conversion device (27) and a recording device (31). The imaging device (20, 26) includes a solid state imaging unit (26) and optical color filters (20) of different spectral characteristics arranged on the solid state imaging unit (26) to convert photoelectrically converting the photographed image. The signal conversion device (27) converts a signal from the imaging device into a luminance signal and two color difference signals. The recording device (31) stores image information including the luminance signal and two color difference signals into a semiconductor memory card (15).
Inventors
- 👤 Minoru Sasaki
- 👤 Masafumi Umeda
- 👤 Yoshitomo Tagami
- 👤 Akihiko Sugikawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 11:24
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/21; H04N1/2104; H04N1/2112; H04N1/2137; H04N1/2158; H04N1/46; H04N1/64; H04N1/646; H04N2101/00
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
105 words
An electronic still camera comprising: imaging means (20, 26) for photoelectrically converting an image to be photographed and including a solid state imaging device (26) and optical color filters (20) of different colors with different spectral characteristics arranged on said solid state imaging device; signal conversion means (27₂, 28, 31₁, 31₂, 31₃, 31₄, 31₅; 27₂, 28′, 31₂′, 31₄′, 31₅′, 41, 42) for converting a signal supplied from said imaging means (20, 26) into a luminance signal and two color difference signals; and recording means (31₆, 31₇) for storing image information including the luminance signal and two color difference signals into a semiconductor memory card (15).
Claim 2
Dependent Claim
105 words
An electronic still camera comprising: imaging means (20, 26) for photoelectrically converting an image to be photographed and including a solid state imaging device (26) and optical color filters (20) of different colors with different spectral characteristics arranged on said solid state imaging device; signal conversion means (27₂, 28, 31₁, 31₂, 31₃, 31₄, 31₅; 27₂, 28′, 31₂′, 31₄′, 31₅′, 41, 42) for converting a signal supplied from said imaging means (20, 26) into a luminance signal and two color difference signals; and recording means (31₆, 31₇) for storing image information including the luminance signal and two color difference signals into a semiconductor memory card (15).
Claim 3
Dependent Claim
70 words
An electronic still camera according to claim 1, characterized in that said signal conversion means (27₂, 28, 31₁, 31₂, 31₃, 31₄, 31₅; 27₂, 28′, 31₂′, 31₄′, 31₅′, 41, 42) has a plurality of modes in which the amount of information of at least one of the luminance signal and two color difference signals is different and includes mode selection means for selecting a specified one of the plurality of modes.
Claim 4
Dependent Claim
57 words
An electronic still camera according to claim 2, characterized in that said signal conversion means (27₂, 28, 31, 31₂, 31₃, 31₄, 31₅; 27₂, 28′, 31₂′, 31₄′ 31₅′, 41, 42) has a mode in which the luminance signal and two color difference signals are subjected to the linear quantization and then supplied to said recording means (31₆, 31₇).
Claim 5
Dependent Claim
63 words
An electronic still camera according to claim 2, characterized in that said signal conversion means (27₂, 28, 31₁, 31₂, 31₃, 31₄, 31₅; 27₂, 28′, 31₂′, 31₄′, 31₅′, 41, 42) has mode in which the luminance signal and two color difference signals are subjected to the sub-sampling process to reduce the number of samplings thereof and then supplied to said recording means (31₆, 31₇).
Claim 6
Dependent Claim
78 words
An electronic still camera according to claim 2, characterized in that said signal conversion means (27₂, 28, 31, 31₂, 31₃, 31₄, 31₅; 27₂, 28′, 31₂′, 31₄′, 31₅′, 41, 42) has a mode in which differences between the luminance signal and two color difference signals and corresponding prediction signals are subjected to the non-linear quantization process to reduce the number of bits required for each sampling and then the processed signals are supplied to said recording means (31₆, 31₇).
Claim 7
Dependent Claim
100 words
An electronic still camera according to claim 2, characterized in that said signal conversion means (27₂, 28, 31₁, 31₂, 31₃, 31₄, 31₅; 27₂, 28′, 31₂′, 31₄′, 31₅′, 41, 42) has a mode in which the luminance signal and two color difference signals are subjected to the sub-sampling process to reduce the number of samplings thereof and differences between the luminance signal and two color difference signals and corresponding prediction signals are subjected to the non-linear quantization process to reduce the number of bits required for each sampling and then the processed signals are supplied to said recording means (31₆, 31₇).
Claim 8
Dependent Claim
63 words
An electronic still camera according to claim 1 or 2, characterized in that said recording means (31₆, 31₇) includes means for dividing the memory area of said memory card (15) into a plurality of blocks each having a predetermined capacity, and storing coded data of the image information of one frame into one or more blocks in which no coded data is stored.
Claim 9
Dependent Claim
42 words
An electronic still camera according to claim 7, characterized in that said recording means (31₆, 31₇) includes data recording means for recording the number of blocks used for each frame of coded data into said memory card (15) correspondingly to the frame.
Claim 10
Dependent Claim
44 words
An electronic still camera according to claim 7, characterized in that said data recording means (31₆, 31₇) includes means for allocating block numbers to respective blocks and storing the block number allocated to the first block of each frame into said memory card (15).
Claim 11
Dependent Claim
44 words
An electronic still camera according to claim 9, characterized in that said data recording means (31₆, 31₇) includes means for recording, at the end of each block, information indicating whether the image data is completed in the block or continues to the next block.
Claim 12
Dependent Claim
39 words
An electronic still camera according to claim 7, characterized in that said data recording means (31₆, 31₇) includes means for assigning a block name to each block and storing the block name of the first block in each frame.
Claim 13
Dependent Claim
44 words
An electronic still camera according to claim 11, characterized in that said data recording means (31₆, 31₇) includes means for recording, at the end of each block, information indicating whether the image data is completed in the block or continues to the next block.
Claim 14
Dependent Claim
71 words
An image recording method of an electronic still camera for coding an image signal and storing the coded signal into a semiconductor memory card (15) in a digital form comprising: a signal conversion step for converting the image signal into a luminance signal and two color difference signals; and a recording step of recording image information including the luminance signal and two color difference signals into said semiconductor memory card (15).
Claim 15
Dependent Claim
71 words
An image recording method of an electronic still camera for coding an image signal and storing the coded signal into a semiconductor memory card (15) in a digital form comprising: a signal conversion step for converting the image signal into a luminance signal and two color difference signals; and a recording step of recording image information including the luminance signal and two color difference signals into said semiconductor memory card (15).
Claim 16
Dependent Claim
117 words
A reproducing device for reproducing a memory card (15) for storing data obtained by coding image information including a luminance signal and two color difference signals in one of a plurality of modes in which the amount of information is different, said memory card (15) being divided into blocks each having a preset capacity, comprising: readout means (91) for reading out preset image information data from said memory card (15); mode determination means (100, 102) for determining a mode of the readout image information data; and signal processing means (92, 93, 94, 106) for restoring the image information data into original image information according to the mode, and deriving an image displaying signal from the image information.
Claim 17
Dependent Claim
117 words
A reproducing device for reproducing a memory card (15) for storing data obtained by coding image information including a luminance signal and two color difference signals in one of a plurality of modes in which the amount of information is different, said memory card (15) being divided into blocks each having a preset capacity, comprising: readout means (91) for reading out preset image information data from said memory card (15); mode determination means (100, 102) for determining a mode of the readout image information data; and signal processing means (92, 93, 94, 106) for restoring the image information data into original image information according to the mode, and deriving an image displaying signal from the image information.
Claim 18
Dependent Claim
35 words
A reproducing device according to claim 14, characterized by further comprising means for writing into said memory card data indicating that the block corresponding to the image information data of a selected frame is invalid.
References Cited (Backward Citations)
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