초록 ▼

An omnidirectional camera comprises a camera having an image pickup element for acquiring a digital image, an image data processing device for compressing signals from the camera and for converting the signal to an image signal, and an external memory. The image data processing device has a signal p

An omnidirectional camera comprises a camera having an image pickup element for acquiring a digital image, an image data processing device for compressing signals from the camera and for converting the signal to an image signal, and an external memory. The image data processing device has a signal processing unit, a writing changeover unit, a set of two first internal memories, a signal compensation unit, a data conversion unit, a third internal memory for temporarily storing the outputted data, and an input/output control unit for controlling the input/output of the data between the third internal memory and the external memory. The writing changeover unit accumulates signals outputted from the signal processing unit in one of the first internal memories until the signals are accumulated to a predetermined amount, and then, the writing changeover unit changes the destination of accumulation and repeatedly accumulates in the other first internal memory.

대표청구항 ▼

1. An omnidirectional camera, comprising: a camera having an image pickup element and used for acquiring a digital image,an image data processing device for compressing signals outputted from said camera and for converting said signal to an image signal, andan external memory,wherein said image data

1. An omnidirectional camera, comprising: a camera having an image pickup element and used for acquiring a digital image,an image data processing device for compressing signals outputted from said camera and for converting said signal to an image signal, andan external memory,wherein said image data processing device has: a signal processing unit for taking in said signal,a writing changeover unit,a set of two first internal memories,a signal compensation unit having a compensation coefficient for compensating signals from said first internal memories,a data conversion unit for converting the compensated signal from said signal compensation unit to an image signal,a third internal memory for temporarily storing the data after conversion outputted from said data conversion unit, andan input/output control unit for controlling the input/output of the data between said third internal memory and said external memory,wherein said writing changeover unit accumulates signals outputted from said signal processing unit in one of said first internal memories until the signals are accumulated to a predetermined amount, wherein the predetermined amount of signal accumulated in said first internal memory is an amount of minimal unit to which said data conversion unit can compress and convert the data, and when the signals are accumulated to the predetermined amount, said writing changeover unit changes the destination of accumulation and repeatedly accumulates in other first internal memories, and signals are outputted to said signal compensation unit from said first internal memory where signals have been accumulated to the predetermined amount, said signal compensation unit compensates the inputted signals based on said compensation coefficient corresponding to a position within said image pickup element, outputs compensated signals to said data conversion unit, said data conversion unit compresses and converts said inputted compensated signal to an image signal, and said image signal is sequentially inputted to said external memory by said input/output control unit. 2. The omnidirectional camera according to claim 1, wherein there are provided two or more cameras, and said signal processing unit, said writing changeover unit, a set of two said first internal memories, said signal compensation unit, said data conversion unit, said third internal memory are provided as many as the number of cameras to correspond to the number of cameras. 3. The omnidirectional camera according to claim 1, wherein said input/output control unit comprises a request mediating unit for giving priority ranking to each two or more writing requests inputted from said third internal memory, and a data stocking unit for temporarily storing the data outputted from said data conversion unit and converted data corresponding to said writing request, wherein the data after conversion is written in said external memory according to the priority ranking as given. 4. The omnidirectional camera according to claim 1, wherein said signal compensation unit carries out shading compensation to brightness of the image derived from optical system of the lens based on said compensation coefficient. 5. The omnidirectional camera according to claim 1, wherein said compensation coefficient is calculated according to a distance from a position where the luminance is at the maximum when a reference light is projected and also according to the decrease of brightness corresponding to said distance. 6. The omnidirectional camera according to claim 5, wherein the relation between said compensation coefficient and said distance is represented by a train of approximate straight lines. 7. The omnidirectional camera according to claim 5, wherein the relation between said compensation coefficient and said distance is represented by complex curves. 8. The omnidirectional camera according to claim 1, wherein said compensation coefficient is obtained from a table having said distance and a compensation coefficient corresponding to said distance. 9. The omnidirectional camera according to claim 1, wherein the predetermined amount comprises 8 pixels ×8.