Sanyo Electric Co., Ltd.

Masanori Tokura

Yukio Sugimura

Yoshiaki Maida

Shiro Suzuki

An image recording apparatus comprises means for storing in a memory input image data as basic image data in a period of a predetermined number of fields as well as feeding the input image data to image compression means, means for finding, with respect to each of the input image data corresponding to the fields between the field corresponding to the input image data which has been stored in the memory and the field corresponding to the input image data which is to be subsequently stored in the memory, the difference between the input image data and the basic image data which has been most newly stored in the memory, and feeding data representing the obtained difference to the image compression means, and means for recording on a recording medium compressed data for each field which has been compressed by the image compression means, together with identification indicating whether the compressed data corresponds to the basic image data or the difference data.

Image recording apparatus, image reproducing apparatus and image recording/reproducing apparatus

An image data alteration preventing apparatus according to the present invention comprises recording means for producing first alteration detecting data on the basis of image data, to record the produced first alteration detecting data, together with the image data, on a recording medium, and examining means for producing second alteration detecting data on the basis of the image data read out of the recording medium, and collating the produced second alteration detecting data and the first alteration detecting data read out of the recording medium, to judge whether or not the image data read out of the recording medium is altered.

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Daito, Japan

Masanori Tokura